Skip to content
KStart free
AI InfrastructureDefenseQuantumAll studies →

CLF US Equity

Cleveland-Cliffs Inc.Materials · Metal Mining · CIK 764065 · FY ends Dec 31
$11.27
+0.53 (+4.93%)
USD · as of 2026-08-21 · marketstack

CLF · 10-K · period ended 2024-12-31

← all CLF documents
filed 2025-02-25 · EDGAR original ↗

Our rendering of the filing — original pagination and typography are not reproduced, and tables are reduced to their short label cells (the figures live on FA). Nothing is summarized: every line below is the filing's own text.

blocks 373851 of 2,143435k characters rendered

ITEM 1A. RISK FACTORS

An investment in our common shares or other securities is subject to risks inherent in our businesses and the industries in which we operate. We describe below certain risks and uncertainties, the occurrences of which could have a material adverse effect on us. The risks and uncertainties described below include known material risks that we face currently, but our material risks are continually evolving, and the below descriptions may not include future risks that are not presently known, risks that are not currently believed to be material or risks that generally apply to most businesses. Although we have extensive risk management policies, practices and procedures in place that are aimed at mitigating these risks, the occurrence of these uncertainties may nevertheless impair our business operations and adversely affect the actual outcome of matters as to which forward-looking statements are made. This report is qualified in its entirety by these risk factors. Before making an investment decision, investors should carefully consider all the risks described below together with the other information included in this report and the other reports we file with the SEC.

Management has identified several categories of material risks that we are subject to, including: (I) economic and market; (II) regulatory; (III) financial; (IV) operational; (V) sustainability and development; and (VI) human capital. Although we have organized the risks by these headings and we have discussed each risk separately, many of the risks are interrelated.

I. ECONOMIC AND MARKET RISKS

The volatility of commodity prices, including steel, scrap metal and iron ore, directly and indirectly affects our ability to generate revenue, maintain stable cash flows and fund our operations.

Our profitability is dependent upon the historically volatile market prices of steel, scrap metal and iron ore. We experience direct impacts of steel price fluctuations through customer sales, as well as direct and indirect impacts of scrap metal and iron ore price fluctuations through third-party sales and the impacts that movements in scrap metal and iron ore prices have on steel prices. As described elsewhere in this report, the prices of steel, scrap metal and iron ore have fluctuated significantly in the recent past, and these pricing shifts are unpredictable and affected by factors beyond our control, including: international demand for, and the impact of higher rates of inflation on, raw materials used in steel production; availability of scrap metal substitutes such as pig iron; commodity price speculation; rates of global economic growth, especially construction and infrastructure activity that requires significant amounts of steel; changes in the levels of economic activity in the U.S., China, India, Europe and other industrialized or developing economies, including as a result of geopolitical conflicts or otherwise; changes in China’s emissions policies and environmental compliance enforcement practices; changes in the production capacity, production rate and inventory levels of other steel producers, distributors, iron ore suppliers and scrap metal processors and traders; changes in trade laws; volumes of unfairly traded imports; imposition or termination of duties or tariffs, including tariffs and retaliatory tariffs that have recently been and may in the future be instituted following the recent change in U.S. presidential administrations, which among other things may affect our cross-border shipments, import and export controls, and other trade barriers impacting the steel and iron ore markets; climate change and other weather-related disruptions, infectious disease outbreaks or natural disasters that may impact the global supply of steel, scrap metal or iron ore; and the proximity, capacity and cost of infrastructure and transportation.

Our revenues, therefore, vary in accordance with the prices of the products we sell. During 2024, for example, we experienced lower average selling prices for our steel products as compared to 2023 due to the impact from lower index pricing, which resulted in lower revenues. In addition, we had lower sales volumes in 2024, which also contributed to lower revenues. To the extent that commodity prices, including the HRC price, coated and other specialty steel prices, international steel prices and scrap metal prices, significantly decline for an extended period, we may have to further revise our operating plans, including curtailing production, reducing operating costs and deferring capital expenditures. As a result, we also may have to record impairments on our goodwill, intangible assets, long-lived assets and/or inventory. Sustained lower prices also could cause us to further reduce existing mineral reserves if certain reserves can no longer be economically mined or processed at prevailing prices. Particularly during periods of increased inflation resulting in higher input costs, we may be unable to decrease our costs in an amount sufficient to offset reductions in revenues and may incur losses. These events could have a material adverse effect on us.

We sell a significant portion of our steel products to the automotive market, and fluctuations or changes in the automotive market could adversely affect our business operations and financial performance.

The largest end user for our steel products is the automotive industry in North America. Beyond these direct sales to the automotive industry, we make additional sales to distributors and converters, which may ultimately resell some of that volume to the automotive market. In addition to the magnitude of our exposure to the automotive industry, we face risks arising from our relative concentration of sales to certain specific automotive manufacturers, and our sales volumes and revenues may be adversely affected if we are unable to renew our fixed price contracts with one or more significant automotive customers or if those customers choose to move certain portions of their parts business to alternate suppliers. Automotive production and sales are cyclical and sensitive to general economic conditions and other factors, including interest rates, consumer credit, spending and preferences, and supply chain disruptions. If automotive production and sales decline, whether due to consumers facing reduced purchasing power caused by inflation, higher interest rates or otherwise, our sales and shipments to the automotive market are likely to decline in a corresponding manner. Adverse impacts that we may sustain as a result include, without limitation, lower margins because of the need to sell our steel to less profitable customers and markets, higher fixed costs from lower steel production if we are unable to sell the same amount of steel to other customers and markets, and lower sales, shipments, pricing and margins generally as our competitors face similar challenges and compete vigorously in other markets that we serve. These adverse impacts could negatively affect our revenues, financial results and cash flows.

18 | CLF 2024 FORM 10-K

Table of Contents

Moreover, despite our position as a leading North America-based flat-rolled steel producer, competition for automotive business has intensified in recent years, as steel producers and companies producing alternative materials have focused their efforts on capturing and/or expanding their market share of automotive business because of less favorable conditions in other markets for steel and other metals, including commodity products. As a result, the potential exists that we may lose market share to existing or new entrants or that automotive manufacturers will take advantage of the intense competition among potential suppliers during periodic contract renewal negotiations to pressure our pricing and margins in order for us to maintain or expand our market share with them, which could negatively affect our revenues, financial results and cash flows.

Global steelmaking overcapacity and overproduction, steel imports, and oversupply of iron ore could lead to lower or more volatile global steel and iron ore prices, directly or indirectly impacting our profitability.

Significant existing global steel capacity and new or expanded production capacity in recent years could potentially cause capacity to exceed demand globally. Although certain American steel producers have shut down production capacity, certain of our competitors have announced and are moving ahead with plans to develop new steelmaking capacity in the near term. In addition, certain foreign competitors, which may have cost advantages due to being owned, controlled or subsidized by foreign governments, have substantially increased their steelmaking capacity and/or production in the last few years and in some instances appear to have targeted the U.S. market for imports. The risk of even greater levels of imports may continue, depending upon foreign market and economic conditions, changes in trade agreements and treaties, laws, regulations or government policies affecting trade, the ability of foreign producers to circumvent U.S. trade sanctions and policy (including in the markets for electrical steels), the value of the U.S. dollar relative to other currencies and other variables beyond our control. In addition, higher sustained market prices of steel and iron ore products could cause new producers to enter the market or existing producers to further expand productive capacity, which could in turn lead to lower steel prices and increasing prices of steelmaking inputs, such as scrap metal. Excess steel and iron ore supply combined with reduced global steel demand and increased imports could also lead to lower steel and iron ore prices. Downward pressure on steel and/or iron ore prices could have an adverse effect on our results of operations, financial condition and profitability.

Severe financial hardship or bankruptcy of one or more of our major customers or key vendors could adversely affect our business operations and financial performance.

Sales and operations for a majority of our customers are sensitive to general economic conditions in the North American automotive, housing, construction, appliance, energy, defense and other industries. Some of our customers are highly leveraged. If there is a sustained weakening of current economic conditions, whether because of operational, cyclical, supply chain or other issues, including inflationary pressures, higher interest rates or an infectious disease outbreak, it could cause customers to reduce, delay or cancel their orders with us, impact significantly the creditworthiness of our customers, and lead to other financial difficulties or even bankruptcy filings by our customers. Failure to receive payment from our customers for products that we have delivered could adversely affect our results of operations, financial condition and liquidity. The concentration of customers in a specific industry, such as the automotive industry, may increase our risk because of the likelihood that circumstances may affect multiple customers at the same time. Such events could cause us to experience lost sales or losses associated with the potential inability to collect all outstanding accounts receivable as well as reduced liquidity. Similarly, certain of our key vendors have recently suffered, and from time to time may continue to suffer, financial hardship, including bankruptcy. Such vendors could face operational disruption or even be forced to liquidate, which could result in such vendors defaulting on their obligations to us or in our inability to secure replacement materials or services on a timely basis, or at all, or cause us to incur increased costs to do so. Such events could adversely impact our continuity of operations, financial results and cash flows.

II. REGULATORY RISKS

U.S. government actions and other countries’ reactions in respect of trade agreements and treaties, laws, regulations, or policies affecting trade could lead to lower or more volatile global steel prices, impacting our profitability.

In recent years, the U.S. government has altered its approach to international trade policy, both generally and with respect to matters directly and indirectly affecting the steel industry, including by undertaking certain unilateral actions affecting trade, renegotiating existing bilateral or multilateral trade agreements, and entering into new agreements or treaties with foreign countries. For example, in March 2018, the U.S. government issued a proclamation pursuant to Section 232 imposing a 25% tariff on imported steel. These Section 232 tariffs were imposed on national security grounds and addressed imported steel that was being unfairly traded by certain foreign competitors at artificially low prices. In retaliation against the Section 232 tariffs, the European Union subsequently imposed its own tariffs against certain steel products and other goods imported from the U.S. Following the November 2020 U.S. presidential election, negotiations between the U.S. government and other governments resulted in revisions to these measures. For example, the U.S. government agreed to modified tariff rate quota systems with each of the European Union, Japan and the United Kingdom that allowed more imports from those trading partners to enter the U.S. market free of Section 232 tariffs. However, in early 2025, the U.S. government announced that the 25% Section 232 tariffs on steel imports would be re-imposed without exemptions and exclusions, beginning in March 2025. Even so, as has occurred in the past, the U.S. government may later determine to negotiate exemptions and exclusions from Section 232 tariffs with certain trading partners. And if the Section 232 measures are removed, modified or substantially weakened, whether through legal challenge, legislation, further executive action or otherwise, imports of foreign steel would likely increase and steel prices in the U.S. would likely fall, which could materially adversely affect our revenues, financial results and cash flows.

19 | CLF 2024 FORM 10-K

Table of Contents

In addition, during 2020, the USMCA was implemented among the U.S., Mexico and Canada in place of the North American Free Trade Agreement. Because all our steel manufacturing facilities are located in North America and one of our principal markets is automotive manufacturing in North America, we believe that the USMCA has the potential to positively impact our business by incentivizing automakers and other manufacturers to increase manufacturing production in North America and to use North American steel. However, it is difficult to predict the implications of changes in trade policy and, therefore, whether the USMCA or other new or renegotiated trade agreements, treaties, laws, regulations or policies that may be implemented by the U.S. government, or otherwise, will have a beneficial or detrimental impact on our business and our customers’ and suppliers’ businesses. Adverse effects could occur directly from a disruption to trade and commercial transactions and/or indirectly by adversely affecting the U.S. economy or certain sectors of the economy, impacting demand for our customers’ products and, in turn, negatively affecting demand for our products. Important links of the supply chain for some of our key customers, including automotive manufacturers, could be negatively impacted by the USMCA or other new or renegotiated trade agreements, treaties, laws, regulations or policies.

While we may currently benefit from certain antidumping and countervailing duty orders, any such relief is subject to periodic reviews and challenges, which can result in revocation or modification of the orders or reduction of the duties. Currently, there are ongoing antidumping and countervailing duty investigations involving imports of corrosion-resistant steel into the U.S. from various countries, including Canada, Mexico, Brazil, Australia, the Netherlands, South Korea, Taiwan, Turkey, Vietnam and the United Arab Emirates. The outcomes of those investigations are uncertain and could adversely affect the competitiveness and viability of our U.S. and/or Canadian corrosion-resistant steel businesses. Following the recent change in U.S. presidential administrations, the U.S. government may seek to alter the USMCA and has imposed and may in the future impose new or additional tariffs on goods imported into the U.S. (including steel or critical production inputs), which has led to and could in the future lead to other countries imposing or threatening to impose retaliatory tariffs on exports of American-made products (including steel) to those countries or other retaliatory efforts, such as restricting exports of critical production inputs to the U.S. In addition, previously granted petitions for trade relief may not be successful or fully effective at preventing harm from subsidized and dumped imports into the U.S. Any of these actions and their direct and indirect impacts could materially adversely affect our revenues, financial results and cash flows.

We are subject to extensive governmental regulation, which imposes potentially significant costs and liabilities on us. Future laws and regulations or the way they are interpreted and enforced could increase these costs and liabilities or limit our ability to produce our raw materials and products.

New laws or regulations, or changes in existing laws or regulations, or the manner of their interpretation or enforcement, could increase our cost of doing business and restrict our ability to operate our businesses or execute our strategies. This includes, among other things:

•changes in, and enforcement of, MSHA regulations, such as respirable silica standards and surface mobile equipment rules;

•evaluation of the National Ambient Air Quality Standards, such as revised nitrogen dioxide, sulfur dioxide, lead, ozone and particulate matter criteria;

•changes in the interpretation of OSHA regulations, such as standards for occupational exposure to noise, ergonomics, protection from chemicals or hazardous substances, infectious diseases, heat stress and potentially hazardous machinery; and

•changes in tax laws and regulations, including the possible taxation under U.S. or foreign country laws of certain income from worldwide operations.

Our operations are subject to various laws and regulations relating to protection of the environment and human health and safety, including those relating to:

•air quality, water quality and conservation;

•plant, wetlands, natural resources and wildlife protection (including endangered or threatened species);

•reclamation, remediation and restoration of properties and related surety bonds or other financial assurances;

•land use;

•the discharge of materials into the environment; and

•the effects that industrial operations and mining have on groundwater quality and availability, such as the potential effects of laws or regulations related to per-and polyfluoroalkyl substances (“PFAS”).

Despite implementation of rigorous environmental protocols and management systems, we cannot be certain that we have been or will be at all times in complete compliance with all such laws and regulations. If we violate or fail to comply with these laws or regulations, we could be fined, required to retrofit or cease operations, subject to criminal or civil liability, or otherwise sanctioned by regulators or barred from participating in government contracts. In addition, regulatory agencies have the authority to order a mine or production facility to be temporarily or permanently closed where imminent danger that could cause death or serious physical harm is perceived. Compliance with the complex and extensive laws and regulations to which we are subject imposes substantial costs on us, which could increase over time because of heightened regulatory oversight, adoption of more stringent environmental, health and safety standards and greater demand for remediation services leading to shortages of equipment, supplies and labor, as well as other factors.

20 | CLF 2024 FORM 10-K

Table of Contents

Specifically, there are several notable proposed or recently enacted rulemakings or activities to which we would be subject or that would further regulate and/or tax us and our customers, which may also require us or our customers to reduce or otherwise change operations significantly or incur significant additional costs, potentially limiting our ability to produce our raw materials and products, depending on their ultimate outcome. These emerging or recently enacted rules, regulations and policy guidance include, but are not limited to:

•trade regulations, trade agreements, treaties or related policies;

•changes in tariff policy, including with respect to the 25% tariff on certain imported steel imposed under Section 232, and including the new or additional tariffs recently imposed by the U.S. government on Canada, China and Mexico and the retaliatory tariffs that have already been, or may in the future be, imposed in response to such tariffs;

•revised National Emission Standards for Hazardous Air Pollutants in the taconite, integrated iron and steel, and coke sectors;

•climate change mitigation strategies and GHG regulation;

•selenium discharge regulation;

•revisions to the sulfate wild rice water quality standard and its implementation;

•Minnesota’s Mercury TMDL;

•ozone transport regulations;

•state agency decisions related to environmental justice initiatives;

•reduction of SO2 levels at steel plants in Canada;

•revised National Ambient Air Quality Standards, particularly for particulate matter; and

•additional regulations regarding PFAS.

We similarly expect some state governments to continue to propose more stringent environmental regulation, in particular related to climate change. Any new or more stringent legislation, regulations, rules, interpretations or orders, when enacted and enforced, including any related to required monitoring and reporting or reductions in, or taxes on, levels of carbon emissions, could have a material adverse effect on our business, results of operations, financial condition or profitability. In addition, judicial decisions or executive actions limiting the authority of regulatory agencies, or impacting current regulations and policies implemented by such agencies, could create uncertainty regarding the regulatory landscape and impact our ability to operate our existing business and plan for future investments.

Our operations may be impacted by the recent enactment, and ongoing consideration, of significant federal and state laws and regulations relating to certain mine-related issues, such as the stability of tailings basins, mine drainage and fill activities, reclamation and safety in underground and surface mines. Additionally, there are requirements for the prompt reporting of accidents and increased fines and penalties for violations of these laws and regulations. Enforcement of existing mine-related laws and regulations, as well as enactment of any new such laws or regulations, may cause us to incur substantial additional compliance costs and fines and penalties for any violations.

In addition, certain of our operations are subject to the risks of doing business abroad and we must comply with complex foreign and U.S. laws and regulations, which may include, but are not limited to, the Foreign Corrupt Practices Act and other anti-bribery laws, regulations related to import/export and trade controls, the European Union’s General Data Protection Regulation and other U.S. and foreign privacy regulations, and transportation and logistics regulations. These laws and regulations may increase our costs of doing business in international jurisdictions and expose our operations and employees to elevated risk. We require our employees, contractors and agents to comply with these and all other applicable laws and regulations, but failure to do so could result in possible administrative, civil or criminal liability and reputational harm to us and our employees.

As a supplier on public procurement projects, including projects that may arise out of proposed or recently enacted governmental legislation regarding infrastructure investments such as the Infrastructure Investment and Jobs Act of 2021, we may be subject to certain stringent regulations that may present compliance challenges or may increase the costs of securing certain business. For example, in order to remain eligible for DOE funding, our major Butler and Middletown capital projects are subject to extensive U.S. government and DOE-specific regulations with which we must comply, including with respect to restrictions related to the use of foreign contractors and workers. Also, the U.S. government has rights to, and imposes restrictions on, intellectual property from the projects. The additional burdens and restrictions imposed by these regulations increase our costs, may limit our operational and contracting flexibility, and may disincentivize certain technology providers or other vendors from working with us. We may also be indirectly affected through regulatory changes that impact our customers, which in turn could reduce the quantity of our products they demand, adversely impact the terms upon which they purchase or the prices for our products they are willing to pay. Regulatory changes that impact our suppliers, such as any changes in labor or environmental standards in China, could decrease the availability of products or services they sell to us or could increase the price they demand for products or services they sell to us.

21 | CLF 2024 FORM 10-K

Table of Contents

Our operations use hazardous materials and inadvertently may impact the environment, which could result in material liabilities to us.

Our operations currently use, and have in the past used, hazardous materials and substances, and we have generated, and expect to continue to generate, solid and hazardous waste. We have been, and may in the future be, subject to claims under laws and regulations for toxic torts, natural resource damages and other damages as well as for the investigation and clean-up of soil, surface water, sediments, groundwater and other natural resources and reclamation of properties. Such claims for damages, as well as investigation, remediation and reclamation requirements, have arisen and may arise in the future out of current, future or former conditions at sites that we or our acquired companies own, lease or operate, as well as sites that we or our acquired companies formerly owned, leased or operated, and at contaminated sites that are or have been owned, leased or operated by our joint venture partners. We may also have liability for contamination at third-party sites where we have sent hazardous wastes. Our liability for these claims may be strict and/or joint and several, such that we may be held responsible for more than our share of the contamination or other damages, or even for entire claims regardless of fault. We may be named as a potentially responsible party at other third-party sites in the future, and we cannot be certain that the costs associated with these additional sites will not exceed any reserves we have established or otherwise be material.

We may be unable to obtain, maintain, renew or comply with permits and licenses necessary for our operations or be required to provide additional financial assurances, which could reduce our production, cash flows, profitability and available liquidity.

We must obtain, maintain and comply with numerous permits and licenses that require approval of operational plans and impose strict conditions on various environmental, health and safety matters in connection with our steel production and processing and mining and other operations. These include permits and approvals issued by various agencies and regulatory bodies, with which we may not always be able to comply. The permitting rules are complex and may change over time, making our ability to comply with the applicable requirements more difficult or potentially impractical and costly, possibly precluding the continuance of ongoing operations or the development of future operations. Interpretations of rules may also change over time and may lead to requirements, such as additional financial assurances, making it costlier to comply. Moreover, despite our ongoing efforts to reduce our environmental footprint and improve the resiliency of our business model, heightened levels of regulatory oversight focused on addressing climate change and industrial activities that generate GHG emissions, such as our steelmaking, cokemaking and mining operations, could impact, delay, or disrupt our ability to obtain new or renewed permits or modifications to existing permits.

In addition, the public, including special interest groups, Tribal nations and individuals, have certain rights under various laws and burgeoning environmental justice policies to comment upon, submit objections to, and otherwise engage in the permitting process, including bringing citizens’ lawsuits to challenge such permits or activities. For example, we have encountered and expect to continue to encounter public objections to permit renewal applications relating to our major steelmaking facilities. Due to these factors or for other reasons, required permits may not be issued or renewed in a timely fashion or at all, or permits issued or renewed may include conditions that we cannot meet, may require additional capital investments, or may restrict our ability to conduct our production, mining and processing activities efficiently. Such conditions could include requirements for additional financial assurances that we may not be able to provide on commercially reasonable terms or at all, which could reduce available borrowing capacity under our ABL Facility. Such conditions, restrictions or requirements could also reduce our production, cash flows or profitability.

III. FINANCIAL RISKS

Our existing and future indebtedness may limit cash flow available to invest in the ongoing needs of our businesses, which could prevent us from fulfilling our obligations under our senior notes, ABL Facility and other debt, and we may be forced to take other actions to satisfy our obligations under our debt, which may not be successful.

As of December 31, 2024, we had $7.1 billion aggregate principal amount of long-term debt outstanding (excluding $62 million of outstanding letters of credit and $382 million of finance leases) and $54 million of cash on our statement of consolidated financial position. As of December 31, 2024, we had $5.6 billion aggregate principal amount of our senior notes and $1.6 billion aggregate borrowings under our ABL Facility outstanding. Our aggregate amount of outstanding debt has increased year-over-year due primarily to additional debt we incurred and/or assumed in connection with completing the Stelco Acquisition during the fourth quarter of 2024. The aggregate principal amount of revolver commitments under our ABL Facility is $4.75 billion, comprised of $4.25 billion of lending commitments available to be borrowed by us and certain of our U.S. subsidiaries, and $500 million of lending commitments available to be borrowed by certain of our Canadian subsidiaries. As of December 31, 2024, the aggregate borrowing availability under our ABL Facility was $2.5 billion based on outstanding letters of credit obligations and our borrowing base.

A portion of our cash flow from operations is used to service debt under our senior notes and ABL Facility, reducing the availability of cash to fund capital expenditures, acquisitions or strategic development initiatives, and other general corporate purposes or to retire debt or return capital to shareholders, including via share repurchases. Although it is uncertain whether the U.S. Federal Reserve will lower, maintain or raise interest rates during 2025 and beyond, higher rates would increase the amount of cash we would need to allocate to servicing the interest expense on our debt for so long as we have an outstanding balance drawn under our ABL Facility.

22 | CLF 2024 FORM 10-K

Table of Contents

Our ability to make scheduled payments on the principal, premium, if any, and interest on our debt, or to refinance our debt obligations, depends on our ability to generate cash in the future and our financial condition and operating performance, which are subject to prevailing economic and competitive conditions and to certain financial, business and other factors beyond our control, as described elsewhere in this “Risk Factors” section. If we are unable to service our debt obligations, we could face substantial liquidity problems and we may be forced to reduce or delay investments, capital expenditures and share repurchases, or to sell assets, seek additional capital, including additional secured or unsecured debt, or restructure or refinance our debt, and we may be unable to continue as a going concern. We may be unable to consummate any proposed asset sales or recover the carrying value of these assets, and any proceeds may not be adequate to meet any debt service obligations then due. Any of these examples potentially could have a material adverse impact on our results of operations, profitability, shareholders’ equity and capital structure. In addition, a failure to comply with any applicable covenants in the instruments governing our debt could result in an event of default that, if not cured or waived, would have a material adverse effect on us.

Our level of indebtedness could have further consequences, including, but not limited to, increasing our vulnerability to adverse economic or industry conditions, placing us at a competitive disadvantage compared to other businesses in the industries in which we operate that are not as leveraged and that may be better positioned to withstand economic downturns and recessionary environments, limiting our flexibility to plan for, or react to, changes in our businesses and the industries in which we operate, and requiring us to refinance all or a portion of our existing debt. We may not be able to refinance on commercially reasonable terms or at all, and any refinancing of our debt could be at higher interest rates and may require us to comply with more onerous covenants, making it more difficult to obtain surety bonds, letters of credit or other financial assurances that may be demanded by our vendors or regulatory agencies, particularly during periods in which credit markets are weak. In addition, our cost of financing or refinancing, access to the capital markets, and the terms under which we purchase goods and services could be adversely affected if credit ratings agencies downgrade our ratings, whether due to factors specific to our business or debt profile, a prolonged cyclical downturn in the steel, scrap metal and mining industries or macroeconomic trends (such as global or regional recessions), increases in pension and OPEB obligations, adverse impacts of inflation and high interest rates, or trends in credit and capital markets more generally. A portion of our borrowing capacity and any outstanding indebtedness under our ABL Facility bears interest at a variable rate based on SOFR. To the extent these interest rates increase, our interest expense will increase. Restricted access to capital markets and/or increased borrowing costs could have an adverse effect on our results of operations, cash flows, financial condition and liquidity.

Our actual operating results may differ significantly from our guidance.

From time to time, we release guidance, including that set forth under “Management’s Discussion and Analysis of Financial Condition and Results of Operations–Outlook” in our Annual Reports on Form 10-K and our Quarterly Reports on Form 10-Q, regarding our future performance. This guidance, which consists of forward-looking statements, is prepared by our management and is qualified by, and subject to, the assumptions and the other information included in our Annual Reports on Form 10-K and our Quarterly Reports on Form 10-Q. Our guidance is not prepared with a view toward compliance with published guidelines of the American Institute of Certified Public Accountants, and neither our independent registered public accounting firm nor any other independent or outside party compiles or examines the guidance and, accordingly, no such person expresses any opinion or any other form of assurance with respect thereto.

Guidance is based upon a number of assumptions and estimates that, while presented with numerical specificity, are inherently subject to business, economic, regulatory and competitive uncertainties and contingencies, many of which are beyond our control and are based upon specific assumptions with respect to future business decisions, some of which will change. The principal reason that we release such data is to provide a basis for our management to discuss our business outlook with analysts and investors. We do not accept any responsibility for any projections or reports published by any such third parties.

Guidance is necessarily speculative in nature, and it can be expected that some or all the assumptions of the guidance furnished by us will not materialize or will vary significantly from actual results. Accordingly, our guidance is only an estimate of what management believes is realizable as of the date of release. Actual results will vary from the guidance. Investors should also recognize that the reliability of any forecasted financial data diminishes the further in the future that the data are forecast. Considering the foregoing, investors are urged to put the guidance in context and not to place undue reliance on it. Any failure to successfully implement our operating strategy or the occurrence of any of the risks described in our Annual Reports on Form 10-K or our Quarterly Reports on Form 10-Q could cause actual operating results to differ from the guidance, and such differences may be adverse and material.

We may be subject to various lawsuits, claims, arbitrations or governmental proceedings that could result in significant expenditures.

We are from time to time subject to various lawsuits, claims, arbitrations or governmental proceedings relating to commercial and business disputes, antitrust claims, environmental matters, government investigations, occupational or personal injury claims, property damage, labor and employment matters, or suits involving legacy operations and other matters. For example, certain of our subsidiaries have been named in lawsuits claiming exposure to asbestos, many of which have been dismissed and/or settled for non-material amounts. Nevertheless, it is likely that similar types of claims will continue to be filed in the future, and we could experience material adverse judgments or incur significant costs to defend such claims or any other existing and future lawsuits, claims, arbitrations or governmental proceedings, including those discussed in Part I - Item 3. Legal Proceedings, which could adversely affect our results of operations, cash flows, financial condition and liquidity. The insurance we maintain may not cover certain claims and, even when coverage applies, it may not be adequate to protect us in the event of significant claims.

23 | CLF 2024 FORM 10-K

Table of Contents

IV. OPERATIONAL RISKS

Our operating expenses could increase significantly if the prices of raw materials, electrical power, fuel or other energy sources increase.

Our operations require significant use of energy, water and raw materials. Although we are largely self-sufficient in iron ore and partially self-sufficient in coke, metallurgical coal and scrap metal, we are wholly or partially dependent on third-party suppliers for certain critical raw materials and production inputs, including industrial gases, graphite electrodes, chrome, zinc, coke, metallurgical coal, scrap metal, fluxing compounds and other alloys. Prices for electricity, natural gas, diesel fuel, oils and raw materials can fluctuate widely with availability and demand levels from other users, including fluctuations caused by the impact of inflationary pressures, supply chain constraints, infectious disease outbreaks and geopolitical conflicts. For example, increased electricity demand to the grid in response to physical climate-related risks, adverse or extreme weather events and electrification of the economy could adversely impact energy prices. During periods of peak usage, although some operations have contractual arrangements in place whereby they receive certain offsetting payments in exchange for electricity load reduction, supplies of energy and raw materials in general may be curtailed and we may not be able to purchase them at historical rates. A disruption in the transmission of energy, inadequate energy transmission infrastructure, or the termination of any of our energy supply contracts could interrupt our energy supply and adversely affect our operations. While we have some long-term contracts with electrical, natural gas and raw material suppliers, we are exposed to fluctuations in energy, natural gas and raw material costs that can affect our production costs. We regularly enter into market-based pricing supply contracts for electricity, natural gas and diesel fuel for use in our operations. Those contracts expose us to price increases in energy costs, which could cause our profitability to decrease significantly. In addition, U.S. public utilities may impose rate increases and/or pass through additional capital and operating cost increases to their customers related to new or pending U.S. environmental regulations or other charges that may require significant capital investment and/or use of cleaner fuels in the future. New or revised regulations or other government actions related to GHG emissions standards could result in rate and/or cost increases from U.S. public utilities, which could significantly increase the costs of operating our manufacturing and mining facilities. Although we regularly monitor and from time to time challenge rate cases initiated by these utilities or other sources seeking to increase the amounts that our facilities must pay for electricity, natural gas or water, there is no assurance that our challenges will be successful in reducing or eliminating proposed rate and/or cost increases.

The majority of our steel shipments are sold under contracts that do not allow us to pass through all increases in raw materials, supplies and energy costs. Some of our customer contracts include variable-pricing or surcharge mechanisms allowing us to adjust the total sales price based on changes in specified raw materials, supplies and energy costs. Those adjustments, however, rarely reflect all our underlying raw materials, supplies and energy cost changes. The scope of the adjustment may also be limited by the terms of the negotiated language, including limitations on when and to what extent the adjustment occurs. Further, due to recent inflationary pressures, many of our vendors have been seeking substantial price increases in order to continue providing critical goods and services, and to the extent we are required to pay relatively more for our steelmaking inputs and are unable to recognize corresponding sales price increases, we would realize lower margins on sales of our products, negatively impacting our results of operations. Our need to consume existing inventories may also delay the impact of a change in prices of raw materials or supplies. Significant changes in raw material costs may also increase the potential for inventory value write-downs in the event of a reduction in selling prices and our inability to realize the cost of the inventory. As we source a portion of our critical supplies, manufacturing equipment and raw materials from China, such as refractories, electrodes, chemicals and spare parts, existing tensions or further adverse geopolitical developments between the U.S. and China triggering or exacerbating sanctions or trading restrictions could lead to us experiencing disruptions, delays or higher costs in supplying our operations and maintaining steady-state production. In addition, even though we are partially self-sufficient in scrap metal, if the market price of scrap metal were to experience a sustained price increase, our cost to produce steel would be adversely affected due to the higher prices we would need to pay to acquire third-party scrap metal for consumption in our operations, which would adversely affect the margins we would realize on our fixed price contracts.

Our sales and competitive position depend on transporting our products to customers at competitive rates and in a timely manner, and our ability to optimize our operational footprint depends on predictably and cost effectively moving products and raw materials internally among our facilities.

Disruption of the rail, trucking, lake and other waterway transportation services because of weather-related problems, including ice and winter weather conditions on the Great Lakes or St. Lawrence Seaway, climate change, strikes, lock-outs, driver shortages and other disruptions in the trucking industry, train crew shortages or other rail network constraints, infectious disease outbreaks, or other events and lack of alternative transportation options could impair our ability to move products internally among our facilities and to supply products to our customers at competitive rates or in a timely manner and, thus, could adversely affect our operations, revenues, margins and profitability. For example, if the vessel shipping season on the Great Lakes were to be interrupted or shortened as compared to historical levels, whether due to extended winter conditions, operational failure of critical shipping locks or otherwise, our ability to transport iron ore pellets to our steel mills could be adversely affected, resulting in potential operational disruptions and reduced production volumes. Further, dredging issues and environmental changes, particularly at Great Lakes ports or along navigable rivers, could adversely impact our ability to move certain of our products or result in higher freight rates. Similarly, we depend on third-party transportation services for delivery of raw materials and other production inputs to us, and failures or delays in delivery would have an adverse effect on our ability to maintain steady-state production and processing operations to meet customer obligations.

24 | CLF 2024 FORM 10-K

Table of Contents

The cost or time to implement a strategic or sustaining capital project may prove to be greater than originally anticipated.

Most of our mines and production and processing facilities have been in operation for several decades, and the equipment is aged, requiring that we continually and successfully implement extensive and costly maintenance practices, programs and upgrades, which may take longer or be more costly than expected. From time to time, we undertake capital projects to enhance, expand, maintain or upgrade our production, mining and processing capabilities. For example, we are engaged in major initiatives at each of our Butler and Middletown facilities to leverage DOE funding to complete capital projects intended to increase our competitiveness and reduce GHG emissions relating to our steelmaking operations. In addition, we are developing an electrical transformer production plant at our former Weirton tinplate facility. Our ability to complete these and other capital projects that we may undertake on time and on budget and achieve the anticipated production volumes, revenues or otherwise realize acceptable returns is subject to a number of risks, many of which are beyond our control, including a variety of market, operational, funding, permitting and labor-related factors. Further, the cost to implement any given capital project may prove to be greater or may take more time than originally anticipated, including due to supply chain issues that may be experienced by our vendors, and the scope of a capital project may expand or otherwise be modified. Capital projects undertaken at existing active operations, such as Butler and Middletown, may also interrupt production capabilities, which could have an adverse effect on costs and profitability. Inability to achieve the expected results from the implementation of our capital projects, incurring unanticipated costs or delays, or the inability to meet contractual obligations could adversely affect our results of operations, future earnings and cash flow generation.

Natural or human-caused disasters, weather conditions, disruption of energy, unanticipated geological conditions, equipment failures, infectious disease outbreaks and other unexpected events may lead our customers, our suppliers, or our facilities to curtail production or shut down operations.

Operating levels within our industry and the industries of our customers and suppliers are subject to unexpected conditions and events that are beyond the industries’ control. Those events, including the occurrence of an infectious disease outbreak, widespread illness or public health emergency, could cause industry members or their suppliers to curtail production or shut down a portion or all of their operations, which could reduce the demand for our products and adversely affect our revenues, margins and profitability.

Our operating levels are subject to conditions beyond our control that can delay deliveries or increase the cost of production for varying lengths of time. Factors that could cause production disruptions could include adverse weather conditions influenced by climate change or otherwise (such as severe winter weather, tornadoes, floods, temperature extremes and the lack of availability of process water due to drought) and natural and human-caused disasters, lack of adequate raw materials, energy or other supplies, and infectious disease outbreaks. Additional factors that could adversely impact production and operations at our mining facilities include tailings dam failures, pit wall failures or ground subsidence, unanticipated geological conditions, including variations in the amount of overburden overlying deposits of iron ore and metallurgical coal, and processing changes.

Our mining operations, processing facilities, logistics capabilities and steelmaking operations depend on critical pieces of equipment. This equipment may, on occasion, be out of service because of unanticipated failures or unplanned outages, including due to long lead times for replacement of critical spares. From time to time, we may experience lengthy shutdowns or periods of reduced production because of equipment failures or unplanned maintenance activities. Further, remediation of any interruption in production capability may require us to make large capital expenditures that could have a negative impact on our profitability and cash flows. Our business interruption insurance may not be available to cover lost revenues associated with maintenance difficulties or damage to or failures of equipment. Longer-term business disruptions could result in a loss of customers, which could adversely affect our future sales levels and revenues.

Many of our production facilities and mines are dependent on a sole source for electric power, natural gas, water, industrial gases and/or certain other raw materials or supplies. A significant interruption in service from our suppliers due to production or transportation issues, workforce difficulties, terrorism or sabotage, weather conditions that may be influenced by climate change, natural disasters, equipment damage or failure, or any other cause could result in substantial losses that may not be fully recoverable, either from our business interruption insurance or responsible third parties.

A disruption in or failure of our IT systems, including those related to cybersecurity, could adversely affect our business operations, reputation and financial performance and could expose us to third-party liability.

We rely on the availability, confidentiality, integrity and security of our IT systems for the operation of many of our business processes and to comply with regulatory, legal and tax requirements. While we maintain some of our critical IT systems, we are also dependent on third parties to provide important IT services relating to, among other things, off-site content hosting, operational process technology at our facilities, human resources, electronic communications and certain finance functions. Further, we operate certain IT hardware and software systems that can be supported only by a very limited number of specialists still remaining in the market with the required skill sets, and our continued reliance on these IT systems may increase the risk of IT system disruption or failure, which could adversely affect our operations.

Despite the security measures that we have implemented, including those related to cybersecurity and data privacy, our IT systems could be breached or damaged by computer viruses, ransomware, natural or human-caused incidents or disasters, or unauthorized physical or electronic access or intrusions, any of which could result in the loss, theft or corruption of sensitive or essential business or personal information and the inability to access or control our IT systems or information. Given our status as a critical supplier of steel to U.S. business and defense interests and the U.S. government’s broad support of Ukraine in defending against Russia’s invasion, we may be the target of malicious cyber activities sponsored by the Russian or Chinese governments or other state

25 | CLF 2024 FORM 10-K

Table of Contents

actors like those described in threat advisories issued from time to time by the U.S. Cybersecurity & Infrastructure Security Agency. Cybersecurity threat actors also may attempt to exploit vulnerabilities through software, including software commonly used by companies in cloud-based services and bundled software. Though we have controls in place and regularly conduct employee training, we cannot provide assurance that a cybersecurity incident or cyberattack will not occur or cause damage or business interruption. Furthermore, despite our efforts to audit certain critical vendors’ information security controls, significant risk may remain with respect to security measures employed by third-party service providers, which may ultimately prove to be ineffective at countering threats.

Failures of our IT systems, whether caused maliciously or inadvertently, may result in the disruption of our business processes, or in the unauthorized release of sensitive, confidential, personally identifiable or otherwise protected information, or result in the corruption of data, or a cybersecurity incident, each of which could adversely affect our businesses. For example, cybersecurity vulnerabilities or other cybersecurity incidents could result in an interruption of the functionality of our automated manufacturing, operating, or health, safety and environmental systems, which, if compromised, could cease, threaten, delay or slow down our ability to produce or process steel or any of our other products for the duration of such interruption or lead to unanticipated health, safety or environmental incidents. This, in turn, could result in reputational harm and lead to litigation, including individual claims or class actions, commercial litigation, administrative, civil or criminal investigations or actions, regulatory intervention and sanctions or fines, investigation and remediation costs, and may adversely affect our employees, results of operations, financial condition and cash flows. In addition, any compromise of the security of our IT systems could result in a loss of confidence in our security measures or in the unauthorized release of third-party confidential information stored in our systems, which could subject us to litigation, regulatory investigations and negative publicity that could adversely affect our reputation and expose us to third-party liability. Our customers, suppliers and vendors may also access or store certain of our sensitive information on their IT systems, which, if breached, attacked or accessed by unauthorized persons, could likewise expose our sensitive information and adversely impact our businesses. Furthermore, as cybersecurity threats continue to evolve and may become more sophisticated, including in connection with the ongoing development of Artificial Intelligence, we may be required to incur significant costs and invest additional resources to protect against and, if required, remediate the damage caused by such disruptions or system failures in the future. The amount of insurance coverage we maintain and require our vendors to maintain may be inadequate to cover claims or liabilities resulting from cybersecurity incidents and attacks, and there is no guarantee that such coverage will continue to be available on commercially reasonable terms or at all.

The closure of an operating facility or mine entails substantial costs. If our assumptions underlying our accruals for closure costs prove to be inaccurate or we prematurely close one or more of our facilities or mines, our results of operations and financial condition would likely be adversely affected.

If faced with overcapacity in the market, regulatory challenges or other adverse conditions, we may seek to rationalize manufacturing and production assets through sales, temporary shutdowns, indefinite idles or facility closures. If we indefinitely idle or permanently close any of our facilities or mines, our production and revenues would be reduced unless we were able to increase production at our other facilities or mines in an offsetting amount, which may not be possible, and could result in customers responding negatively by taking current or future business away from us if we seek to transition production to a different facility. Alternatively, we could fail to meet customer specifications at the facilities to which products are transitioned, resulting in customer dissatisfaction or claims. To the extent an idled or closed facility formerly supplied critical inputs to our upstream production facilities, we may need to secure alternate sources for such critical inputs, the cost and availability of which may be uncertain. For example, during 2024, we indefinitely idled our Weirton, West Virginia tinplate production facility, which caused us to recognize costs of approximately $210 million in respect of employee-related costs, asset impairments and exit costs.

The closure of a steelmaking or other operating facility or mining operation involves significant closure costs, including reclamation and other environmental costs, the costs of terminating long-term obligations, including customer, energy and transportation contracts and equipment and real property leases, costs associated with the altered tax profile of an idled or closed facility, and certain accounting charges, including asset impairment and accelerated depreciation. In addition, a permanent facility or mine closure could accelerate and significantly increase employment legacy costs, including our expense and funding costs for pension and OPEB obligations and multiemployer pension withdrawal liabilities. For example, employees could be eligible for immediate retirement under special eligibility rules that apply upon a steelmaking facility or mine closure. The employees eligible for immediate retirement under the pension plans at the time of the permanent closure also could be eligible for OPEB, thereby accelerating our obligation to provide these benefits. Certain closures could precipitate a pension closure liability significantly greater than an ongoing operation liability and may trigger certain severance liability obligations. In addition, we are party to several joint ventures relating to iron ore mining, downstream steel processing and scrap metal recycling, and if our joint venture partners experience financial hardships or fail to perform their obligations upon closure, we may be required to assume significant additional obligations on behalf of the joint venture, including costs of environmental remediation and pension and OPEB obligations.

Although we base our assumptions regarding the life of our mines on detailed studies we perform from time to time, which are reviewed and validated by QPs, those studies and assumptions are subject to uncertainties and estimates that may not be accurate. We recognize the costs of reclaiming open pits, stockpiles, tailings ponds, roads and other mining support areas based on the estimated mining life of our properties. If our assumptions underlying our accruals for closure costs, including reclamation and other environmental costs, prove to be inaccurate or insufficient, or our liability in any particular year is greater than currently anticipated, our results of operations and financial condition could be adversely affected. In addition, if we were to significantly reduce the estimated life of any of our mines, the mine closure costs would be applied to a shorter period of production, which would increase costs per ton produced and could adversely affect our results of operations and financial condition.

26 | CLF 2024 FORM 10-K

Table of Contents

We incur certain costs when production capacity is idled, as well as increased costs to resume production at previously idled facilities.

Our decisions concerning which facilities to operate and at what production levels are made based in part upon our customers’ orders for products, as well as the quality, performance capabilities and cost of our operations. During depressed market conditions, we may concentrate production at certain facilities and not operate others in response to customer demand or other reasons, and as a result we may incur idle costs that could offset our anticipated savings from not operating the idled facility. For example, due to increased scrap usage and less demand for iron ore pellets in our steelmaking operations, our Northshore mining and pelletizing facility was temporarily idled during portions of 2022 and 2023, and we incurred certain fixed costs at that facility during the idle periods. We cannot predict whether our operations will experience additional similar or dissimilar disruptions in the future. When we restart idled facilities, we incur certain costs to replenish inventories, prepare the previously idled facilities for operation, perform the required repair and maintenance activities, and prepare employees to return to work safely and resume production responsibilities. The amount of any such costs could be significant, depending on a variety of factors, such as the period of idle time, necessary repairs and available employees, and is difficult to project.

We face ongoing risks relating to the recent Stelco Acquisition.

During the fourth quarter of 2024, we completed the Stelco Acquisition. The Stelco Acquisition may be less accretive than expected, or may be dilutive, to our earnings per share, which could cause the price of our common shares to decline. In addition, the Stelco Acquisition involves significant risks and uncertainties that may adversely affect us over the short, medium and long terms, including the following:

•we may be unable to realize anticipated synergies or other expected benefits or cost savings from the Stelco Acquisition;

•additional debt incurred or assumed in connection with the Stelco Acquisition could limit our financial flexibility;

•we have assumed additional environmental liabilities, commitments, contingencies, and remediation and reclamation projects relating to Stelco, including the obligation to pay taxes on Stelco’s GHG emissions and the potential requirement to implement desulfurization capabilities at Stelco’s operations;

•potential impairment of recorded tangible and intangible asset values for Stelco, including goodwill, could result in material non-cash charges to our results of operations in the future;

•we face challenges associated with managing international cokemaking, steelmaking and finishing operations, including complying with existing and emerging Canadian regulatory requirements, as well as other risks of operating in multiple countries, such as fluctuations in currency exchange rates, potentially adverse tax consequences due to overlapping or differing tax structures, burdens to comply with multiple and potentially conflicting foreign laws and regulations, including with respect to import or export controls, tariffs, duties and other trade barriers;

•we may be unable to satisfy our operational, employment, environmental or other undertakings or commitments made to the Canadian government in connection with the Stelco Acquisition;

•exposure to unknown liabilities and unforeseen costs relating to Stelco that were not disclosed to us or discovered during due diligence could adversely affect our results of operations;

•the potential loss of key employees, suppliers, customers or other business partners of Stelco could adversely affect our operating and financial performance; and

•tariffs imposed by the U.S. government on Canadian products could effectively increase the price of any steel products that Stelco seeks to sell into the U.S., and retaliatory tariffs imposed by the Canadian government on U.S. products could effectively increase the cost of any production inputs that Stelco sources from U.S. suppliers, either of which could adversely affect Stelco's results of operations to the extent it is required to bear any such increases.

If one or more of these risks and uncertainties were to materialize, we could experience reduced revenues, higher costs, lower profitability and other adverse impacts to our operations and businesses.

We may not have adequate insurance coverage for some business risks.

Our operations are generally subject to a number of hazards and risks that could result in personal injury or damage to, or destruction of, equipment, properties or facilities. Depending on the nature and extent of a loss, the insurance that we maintain to address risks that are typical in our businesses may not be adequate or available to fully protect or reimburse us, or our insurance coverage may be limited, canceled or otherwise terminated. Insurance against some risks, such as liabilities for environmental pollution, tailings basin breaches, or certain hazards or interruption of certain business activities, may not be available at an economically reasonable cost, or at all. Even if available, we may self-insure or maintain high deductibles where we determine it is most cost effective to do so. As a result, despite the insurance coverage that we carry, accidents or other negative developments involving our production, mining, processing or transportation activities causing losses in excess of policy limits, or losses arising from events not covered under insurance policies or subject to substantial deductibles, could have a material adverse effect on our financial condition and cash flows. In addition, the potential increase in extreme weather events influenced by climate change or otherwise may adversely impact our access to cost effective insurance in the future. The risk of increased insurance costs may have greater impact where the adverse event results in us asserting an insurance claim, the cost of which our insurers may seek to recoup during a future insurance renewal through increased premiums or limitations on coverage.

27 | CLF 2024 FORM 10-K

Table of Contents

V. SUSTAINABILITY AND DEVELOPMENT RISKS

As we and our stakeholders seek reduced carbon footprints, transition toward carbon neutrality and enhance business sustainability, we face increased financial, regulatory, legal, and reputational risks and potential loss of business opportunities because our operations utilize carbon-based energy sources and produce GHG emissions.

As described in detail in Part I - Item 1. Business - Environmental Matters - Regulatory Developments - Climate Change and GHG Regulations above, because our operations use carbon-based energy and produce GHG emissions, we are subject to risks relating to decarbonization initiatives being undertaken by regulators and other stakeholders as part of global efforts to address the potential impacts of climate change. For example, as part of climate change mitigation strategies, governmental authorities may introduce mandatory carbon pricing obligations, carbon emissions limitations, carbon taxes or carbon trading mechanisms, such as the carbon taxes we are required to pay in respect of Stelco’s emissions, any of which could impose significant costs on our operations, including causing us to incur higher energy and supplier costs, invest in costly and potentially unproven emissions control or reduction technologies, and engage in more intensive environmental monitoring and reporting efforts. In addition, complying with current or future international treaties and laws or regulations concerning climate change and GHG emissions could negatively impact our ability, and that of our customers and suppliers, to compete with companies located in areas not subject to or not complying with such constraints. We may also face more limited access to, or increased costs of, capital to the extent financial institutions and investors increase expectations relating to lowering GHG emissions or reduce investments in carbon-intensive businesses or industries. Further, increased pressure from customers or other business partners seeking to reduce their indirect carbon footprints and achieve certain overall decarbonization targets, including by sourcing a larger percentage of steel products from recycled steel, could result in the potential loss of business opportunities if we are unable to meet their carbon, GHG emissions or sustainability expectations, or if we are perceived to have higher GHG intensity than our competition.

In addition, as part of our decarbonization strategy, we are investigating and from time to time may consider investments in or other relationships with various renewable and clean energy initiatives. For example, we have engaged in various discussions with other companies, universities and national research laboratories to leverage funding available under various DOE programs to support GHG emissions reductions. In 2024, the DOE awarded us funding to pursue two innovative projects intended to enhance business competitiveness and reduce GHG emissions at our Butler Works facility in Pennsylvania and our Middletown Works facility in Ohio. The Butler Works project involves replacing natural gas furnaces with electric induction furnaces for high-temperature reheating of GOES. The Middletown Works project involves a flex-fuel plant capable of consuming hydrogen or natural gas for the production of direct reduced iron, as well as two electric melting furnaces to melt the direct reduced iron into molten iron for use in the existing co-located BOF to produce the quality of steel currently produced at the mill. During 2024, the DOE awarded funding to multiple hydrogen hubs, and we have expressed interest in offtaking hydrogen from hubs near our operations. We commissioned a pipeline and completed a successful hydrogen injection trial at our Indiana Harbor blast furnace #7 in 2024, with the aim of enabling us to utilize clean hydrogen once it becomes viable at industrial quantities. In addition, we continue to engage with renewable energy developers on clean energy projects, with an emphasis on behind-the-meter solar projects located onsite at our operating facilities. While we are actively pursuing these decarbonization and energy-related projects, there are no guarantees that sufficient funding or the necessary advanced technology will be available to complete any of these projects under currently anticipated timeframes or at all. Additionally, we may not be successful in achieving our current or any future short, medium or long-term GHG emissions reduction goals, including any net-zero or near-zero goals, due to adverse changes in business conditions over time, unanticipated financial challenges or operational improvement efforts that may not be as successful as originally forecasted, or regulatory developments arising after such goals were initially announced.

To maintain consistent operational performance and foster growth in our businesses, we must maintain our social license to operate with our stakeholders.

Maintaining a strong reputation and consistent operational, environmental and safety track records is vital to continuing to foster business growth and maintaining our permission to operate. As stakeholders’ sustainability expectations increase and regulatory requirements continue to evolve, maintaining our social license to operate becomes increasingly important. Our ability to maintain our reputation and strong operating track record could be threatened, including by challenges relating to the integration of our recent acquisitions or by circumstances outside of our control, such as disasters caused or suffered by other companies in the steel and mining industries. Our social license to operate could also be adversely affected and claims have been and could continue to be made against us to the extent that environmental factors negatively impact local communities, such as air emissions, discharges to water, dust, odors, noise and other factors that are inherent in industrial activities like our steelmaking, cokemaking, scrap metal processing and mining operations, even if such activities are conducted in accordance with legal, regulatory and permit requirements. If we are not able to respond effectively to these and other challenges to our social license to operate, our reputation could be damaged significantly. Damage to our reputation or third-party claims initiated in response to our ongoing activities could adversely affect our continuity of operations, current and prospective business relationships, and ability to foster growth projects.

We rely on estimates of our recoverable mineral reserves, which are complex due to geological characteristics of the properties and the number of assumptions made.

We regularly evaluate, and engage third-party QPs to review and validate, our mineral reserves based on revenues and costs and update them as required in accordance with SEC regulations. Estimates of mineral reserves and future net cash flows necessarily depend upon a number of variable factors and assumptions, some of which are beyond our control, such as production capacity, effects of governmental regulations, future prices for minerals we mine, future industry conditions and operating costs, taxes, development costs, and costs of extraction and reclamation. Estimating the quantity and grade of mineral reserves requires us to

28 | CLF 2024 FORM 10-K

Table of Contents

determine the size, shape and depth of our mineralized bodies by analyzing geological data, such as samplings of drill holes, and a QP to review and validate our determinations. Estimated mineral reserves could be affected by future industry conditions, future changes in the SEC’s mining property disclosure requirements, variation in geological conditions and ongoing mine planning. Actual volume and grade of reserves recovered, production rates, revenues on third-party sales and expenditures with respect to our reserves will likely vary from estimates, and if such variances are material, our sales and gross margins could be adversely affected.

Defects in title or loss of any access rights or leasehold or option interests in mining properties could limit our ability to mine these properties or result in significant unanticipated costs.

Many of our mining operations are conducted on properties we lease, license or for which we have easements, options or other possessory interests. We generally do not maintain title insurance on our mining properties, and certain of our land access arrangements were negotiated many years ago and have not been updated. Any title defect, inability to negotiate future access rights required by our mine plans, or the loss of any lease, license, option, easement or other possessory interest for any mining property could adversely affect our ability to access and mine any associated reserves. In addition, from time to time the rights of third parties for competing uses of adjacent, overlying or underlying lands, such as for roads, easements, public facilities or other mining activities, may result in disputes and affect our ability to operate as planned if our title is not superior or mutually acceptable arrangements cannot be negotiated. Any challenge to or inability to establish our title or access could delay the exploration and development of some reserves, resources, deposits or surface rights, cause us to incur unanticipated costs, and could ultimately result in the loss of some or all of our interest in those properties. In the event we lose reserves, resources, deposits or surface rights, we may be required to shut down or significantly alter impacted mining operations, thereby affecting future production, internal supply patterns and margins, revenues and cash flows.

VI. HUMAN CAPITAL RISKS

We depend on our senior management team and other key employees, and the loss of these employees could adversely affect our businesses.

Our success depends in part on our ability to attract, retain, develop and motivate our senior management and key employees. Achieving this objective may be difficult due to a variety of factors, including fluctuations in global economic and industry conditions, competitors’ hiring practices, cost reduction activities, and the effectiveness of our compensation programs. Competition for qualified personnel can be intense. We must continue to recruit, retain, develop and motivate our senior management and key personnel to maintain our businesses and support our projects. A loss of senior management and key personnel could prevent us from capitalizing on business opportunities, and our operating results could be adversely affected.

Our profitability could be adversely affected if we fail to maintain satisfactory labor relations.

Our production is dependent upon the efforts of our employees. We are party to labor agreements with various labor unions that represent employees at most of our operations. Such labor agreements are negotiated periodically, and, therefore, we are subject to the risk that these agreements may not be able to be renewed on reasonably satisfactory terms. It is difficult to predict what issues may arise as part of the collective bargaining process, and whether negotiations concerning these issues will be successful. Due to union activities or other employee actions, we could experience labor disputes, work stoppages or other disruptions in our production that could affect us adversely. Although we successfully negotiated all of our labor agreements that expired in 2024, we have several other labor agreements that will expire in 2025, including those covering union workers at our Butler, Monessen, Zanesville and certain FPT operations, and the outcomes of those labor negotiations are uncertain. If we enter into a new labor agreement with any union that significantly increases our labor costs relative to our competitors or fail to come to an agreement upon expiry, our ability to compete or continuity of production may be materially and adversely affected.

Our expenditures for pension and OPEB obligations could be materially higher than we have predicted if our underlying assumptions differ from actual outcomes, there are regulatory changes or the funded status of the multiemployer plans that we participate in degrade.

We provide retiree benefits through defined benefit pension and OPEB plans to certain eligible employees and retirees. Certain defined benefit pension plans are underfunded and may be subject to minimum cash contributions required by ERISA. Certain OPEB plans have funding requirements that are set under our collective bargaining agreements. Our funding obligations can significantly increase if plan assets underperform, the interest rates used to calculate minimum funding levels decrease, there are changes in laws and regulations affecting funding requirements or if there are increases to the benefit obligations. The calculation of the benefit obligation is based on several assumptions, including discount rates, healthcare trend rates, benefit levels pursuant to collective bargaining, mortality and other demographic assumptions. We have seen significant changes in retiree healthcare costs in recent years, which can be affected by changes in laws and regulations. If our assumptions do not materialize as expected and we make adverse changes to these assumptions, our earnings and cash flows could be unfavorably impacted.

We also contribute to certain multiemployer pension plans, including the Steelworkers’ Pension Trust, for which we are one of the largest contributing employers. Contribution amounts are determined during collective bargaining with our unions and could increase during future collective bargaining negotiations. Our obligations to these multiemployer plans could also increase if the funded status were to decline, which could be due to poor plan asset performance or if other contributors do not meet their obligations. If a multiemployer plan were to terminate or if we choose to withdraw, we could be subject to a liability based on the plan's underfunded status.

29 | CLF 2024 FORM 10-K

Table of Contents

In addition, some of the transactions in which we previously sold or otherwise disposed of our non-core assets included provisions transferring certain pension and other liabilities to the purchasers or acquirers of those assets. While we believe that all such transfers were completed properly and are legally binding, if the purchaser fails to fulfill its obligations, we may be at risk that a court, arbitrator or regulatory body could disagree and determine that we remain responsible for pension and other liabilities that we intended to and did transfer.

We may encounter labor shortages for critical operational positions, which could adversely affect our ability to produce our products.

We are predicting a long-term shortage of skilled workers in heavy industry, such as electricians, and in certain highly specialized IT roles, such as legacy systems support, and competition for available workers limits our ability to attract and retain employees as well as engage third-party contractors. We may face potential labor shortages, as many of our most specialized and skilled roles are held by our more senior, experienced employees. As we lose these employees through attrition or otherwise, we may lose these workers’ specialized institutional knowledge of our legacy businesses and systems, and we may have difficulty replacing them at competitive wages or at all.

ITEM 1B. UNRESOLVED STAFF COMMENTS

We have no unresolved comments from the SEC.

ITEM 1C. CYBERSECURITY

Management of cybersecurity risks is an integral part of our overall risk management framework and is essential for safeguarding our business and data. We have developed an information security program to assess, identify and manage material risks from cybersecurity threats. The program includes policies and procedures that identify how security measures and controls drawn from multiple security frameworks are developed, implemented and maintained. Our cybersecurity risk management program works to balance critical infrastructure, network, application, cloud and information security objectives with overall business objectives and risk tolerance. Specific controls that are used include endpoint threat detection and response, identity and access management, privileged access management, logging and monitoring involving the use of security information and event management, multi-factor authentication, firewalls and intrusion detection and prevention, and vulnerability and patch management.

We use threat intelligence to inform our defensive measures. We use external and internal threat intelligence sources, including information from industry vendors and government agencies. Evolving threats and risks we are also monitoring and working to protect against include Artificial Intelligence, ransomware and nation-state attacks.

We believe in continuous improvement as part of the effort to optimize security, and we work to foster that culture through various initiatives:

•Cybersecurity Awareness Trainings: We educate employees on best practices for online safety and for identifying potential cybersecurity threats, including by maintaining quarterly training programs for our non-represented salaried workforce.

•Simulated Cyberattacks: With assistance from qualified third-party experts, we periodically conduct penetration testing and tabletop exercises to test our technical controls and incident response plans.

•Security Monitoring: We monitor our information technology environment with both our internal cybersecurity resources and third-party service providers. We also have processes in place to monitor the cybersecurity practices of various third-party service providers, including certain vendors that have access to our information systems or sensitive data.

•Proactive Reporting and Investigation: As part of our training initiatives, we regularly educate employees on how to report any suspicious cyber activity or potential cybersecurity issues, and we investigate reported concerns.

Third-party security firms are used in different capacities to provide or operate some of these programs, controls and technology systems, including cloud-based platforms and services.

Our Board of Directors has overall oversight responsibility for our enterprise risk management program and delegates cybersecurity risk management oversight to the Audit Committee of the Board of Directors.The Audit Committee is responsible for ensuring that management has processes in place designed to identify and evaluate cybersecurity risks to which the Company is exposed and implement processes and programs to manage cybersecurity risks and mitigate cybersecurity incidents.Management, including the Chief Information Officer with support from our cybersecurity team, updates the Audit Committee on at least a biannual basis regarding our cybersecurity programs and material cybersecurity risks and mitigation strategies.The Audit Committee also regularly reports on discussions regarding cybersecurity risks to our full Board of Directors.Management is responsible for identifying, considering and assessing material cybersecurity risks on an ongoing basis, establishing processes to ensure that such potential cybersecurity risk exposures are monitored, putting in place appropriate mitigation measures and maintaining cybersecurity programs.Our cybersecurity programs are under the direction of our Chief Information Officer, who has three years of experience overseeing information technology and cyber functions and who receives reports from our cybersecurity team and monitors the prevention, detection, mitigation and remediation of cybersecurity incidents. Our cybersecurity team includes personnel that have obtained credentials from the International System Security Certification Consortium and the SANS Institute, such as Certified Information Systems Security Professional (CISSP) and GIAC Certified Incident Handler, as well as experienced information systems security professionals and information security managers. Additionally, our internal Information

30 | CLF 2024 FORM 10-K

Table of Contents

Security Committee, composed of leaders from key departments, collaborates on a cross-functional basis to identify practices that can counter threats and to monitor our cybersecurity programs and our cybersecurity incident response plans.

We recognize the ever-present global risk of cyberattacks from diverse threat actors, including nation-states, cybercriminals, hacktivists, insiders and organized crime. In spite of our efforts, we (or third parties we rely on) may not be able to fully, continuously and effectively implement security controls as intended. As described above, we utilize a risk-based approach and judgment to determine the security controls to implement, but it is possible we may not implement appropriate controls if we do not recognize or we underestimate a particular risk. In addition, security controls, no matter how well designed or implemented, may only mitigate and not fully eliminate risks. Further, even events that are detected by security tools or third parties may not always be immediately understood or acted upon. While no organization is immune to attack attempts and we cannot eliminate all risks from cybersecurity threats or provide assurance that we have not experienced an undetected cybersecurity incident, in 2024 we did not identify any material cybersecurity events that have materially affected or are reasonably likely to materially affect our business strategy, results of operations or financial condition. For further information about these risks, please see Part I - Item 1A. Risk Factors - IV. Operational Risks - A disruption in or failure of our IT systems, including those related to cybersecurity, could adversely affect our business operations, reputation and financial performance and could expose us to third-party liability.

ITEM 2. PROPERTIES

The following map shows the locations of our active operations and corporate headquarters as of December 31, 2024:

CORPORATE OFFICES

We lease our corporate headquarters in Cleveland, Ohio. We also have leased office space in West Chester, Ohio; Chicago, Illinois; and Detroit, Michigan. We own office space located in Burns Harbor, Indiana and our Research and Innovation Center located in Middletown, Ohio.

31 | CLF 2024 FORM 10-K

Table of Contents

STEELMAKING

Location Raw Material

Hibbing Taconite MN l 7.0

Minorca MN l 3.0

Northshore MN l 5.0

Tilden MI l 8.0

United Taconite MN l 6.0

Toledo HBI OH l 1.9

Burns Harbor (Coke) IN l 1.8

Hamilton Works (Coke) ON l 0.7

Lake Erie Works (Coke) ON l 0.7

Monessen PA l 0.3

Warren OH l 0.5

Princeton WV l 1.8

FPT Multiple l N/A

Location Raw Steel Processing and Finishing

Burns Harbor IN l 5.0 l l l l

Burns Harbor Plate IN l

Butler PA l 0.4 l

Cleveland Works OH l 3.4 l l l l

Coatesville PA l 0.2 l l

Columbus OH l

Conshohocken PA l

Coshocton OH l

Dearborn Works MI l 3.0 l l l

Gary Plate IN l

Hamilton Works ON l l l

Indiana Harbor Works IN l 4.0 l l l l

Lake Erie Works ON l 2.5 l

Mansfield Works OH l 0.5 l

Middletown Works OH l 3.0 l l l l l

New Carlisle IN l l

Piedmont NC l

Riverdale IL l 0.7 l

Rockport Works IN l l l

Steelton PA l 0.3 l

Zanesville OH l

STEELMAKING AND FINISHING FACILITIES

Our primary steel producing and finishing facilities are located across Illinois, Indiana, Michigan, Ohio, Pennsylvania, and Ontario. We operate eight blast furnaces and five EAFs. Finishing is completed on site at our integrated operations or at one of our 10 stand-alone processing and finishing facilities. In the aggregate, we have annual configured production capacity of approximately 23.0 million net tons of raw steel. During the years ended December 31, 2024 and 2023, our steelmaking facilities produced a total of 17.7 million and 19.0 million net tons of raw steel, respectively.

SCRAP PROCESSING FACILITIES

Our scrap business consists of our subsidiary FPT, which has 22 locations in Michigan, Ohio, Tennessee, Florida and Ontario. These facilities are primarily located in Michigan and Ohio, which are in close proximity to our scrap consuming steel facilities. During the years ended December 31, 2024 and 2023, FPT processed approximately 3 million net tons of scrap metal, of which approximately 50% of total output was prime grade.

32 | CLF 2024 FORM 10-K

Table of Contents

DIRECT REDUCTION PLANT

Our direct reduction plant is located in Toledo, Ohio, is near an existing dock, and has access to rail and heavy haul roads for operation logistics. We are leasing the property on which the plant is located. This plant produces a specialized high quality iron alternative to scrap and pig iron and has annual capacity of 1.9 million metric tons of HBI. During the years ended December 31, 2024 and 2023, our direct reduction plant produced a total of 1.6 million and 1.7 million metric tons of HBI, respectively.

IRON ORE MINES AND PELLET PLANTS

The following information concerning our mining properties has been prepared in accordance with the requirements of subpart 1300 of Regulation S-K.

As used in this Annual Report on Form 10-K, the terms “mineral resource,” “measured mineral resource,” “indicated mineral resource,” “inferred mineral resource,” “mineral reserve,” “proven mineral reserve,” and “probable mineral reserve” are defined and used in accordance with subpart 1300 of Regulation S-K. Under subpart 1300 of Regulation S-K, mineral resources may not be classified as “mineral reserves” unless the determination has been made by a QP that the mineral resources can be the basis of an economically viable project. Investors are specifically cautioned not to assume that any part or all of the mineral deposits (including any mineral resources) in these categories will ever be converted into mineral reserves, as defined by the SEC.

Investors are cautioned that, except for that portion of mineral resources classified as mineral reserves, mineral resources do not have demonstrated economic value. Estimates of inferred mineral resources have too high of a degree of uncertainty as to their existence and may not be converted to a mineral reserve. Therefore, investors are cautioned not to assume that all or any part of an inferred mineral resource exists, that it can be the basis of an economically viable project, or that it will ever be upgraded to a higher category. Likewise, investors are cautioned not to assume that all or any part of measured or indicated mineral resources will ever be converted to mineral reserves.

See Part I – Item 1A. Risk Factors – V. Sustainability and Development Risks – We rely on estimates of our recoverable mineral reserves, which are complex due to geological characteristics of the properties and the number of assumptions made.

The information that follows relating to the Hibbing, Minorca, Northshore, Tilden and United Taconite iron ore mines is derived, for the most part, from, and in some instances is an extract from, the Technical Report Summaries relating to such properties prepared in compliance with Item 601(b)(96) and subpart 1300 of Regulation S-K. Portions of the following information are based on assumptions, qualifications and procedures that are not fully described herein. Reference should be made to the full text of the Technical Report Summaries, which are filed as Exhibits 96.1 through 96.5 to this Annual Report on Form 10-K and are incorporated by reference herein.

All of our iron ore mining operations are open-pit mines. Additional development is underway as required by long-range mine plans. Drilling programs are conducted periodically to collect geologic modeling data and for refining ongoing operations.

Geologic models are developed for all mines to define the major ore and waste rock types. Computerized block models for iron ore are constructed that include all relevant geologic and metallurgical data. These are used to generate grade and tonnage estimates, followed by detailed mine design and LoM operating schedules.

We currently own or co-own and operate five production-stage iron ore mines in Michigan and Minnesota, as well as one indefinitely idled mine in Michigan. We have an aggregate annual production capacity of approximately 29 million long tons of iron ore pellets, including our 85.3% share of the Hibbing mine production. Our iron ore mines produce from deposits located within the Biwabik and Negaunee Iron Formation, which are classified as Lake Superior type iron formations that formed under similar sedimentary conditions in shallow marine basins approximately two billion years ago. Magnetite and hematite are the predominant iron oxide ore minerals present, with lesser amounts of goethite and limonite. Quartz is the predominant waste mineral present, with lesser amounts of other chiefly iron bearing silicate and carbonate minerals. The ore minerals liberate from the waste minerals upon fine grinding.

The following represents iron ore production for the last three fiscal years:

Iron Ore Production

United Taconite 5 5 5

1Hibbing is reported at 85.3% based on our ownership level.

33 | CLF 2024 FORM 10-K

Table of Contents

The following provides an overview of our iron ore properties:

All the infrastructure necessary to mine and process significant commercial quantities of iron ore is currently in place at all of our mine locations. Infrastructure items include high voltage electrical supplies, natural gas pipelines that connect to the North American distribution system, water sources, paved roads and highways, railroads for transporting crude ore and finished products, port facilities that connect to the Great Lakes, and accommodations for employees. Local and state infrastructure also includes hospitals, schools, airports, equipment suppliers, fuel suppliers, commercial laboratories and communication systems. Labor is readily available with major population centers within 25 miles of all of our properties.

All of our iron ore mining operations grant leases, licenses and easements for various purposes, including miscellaneous community land uses, utility infrastructure and other third-party uses, that encumber our properties but do not materially inhibit operations. Certain assets also serve as collateral securing obligations under our ABL Facility. We maintain the requisite state and federal permits and are in material compliance with all material permits.

HIBBING

Hibbing (85.3% owned) is located immediately north of the city of Hibbing, Minnesota in the center of Minnesota’s Mesabi Iron Range. The mining and processing operation is located between latitude 47°25’48” N and 47°31’48” N and longitude 93°04’54” W and 92°54’36” W.

For further information, see Exhibit 96.1, the Technical Report Summary on the Hibbing Taconite Property, Minnesota, USA, prepared for the Company by the QP, SLR, with an effective date of December 31, 2021.

MINORCA

Minorca (100% owned) is located in the center of Minnesota’s Mesabi Iron Range. The Laurentian Pit is located near the City of Gilbert, Minnesota at latitude 47°30'0"N and longitude 92°26’30"W, East 1 Pit is located at latitude 47°31'30"N and longitude 92°23’30"W, and East 2 Pit is located just west of the City of Biwabik at latitude 47°32'0"N and longitude 92°22’30"W. The Minorca plant is located approximately seven miles to the northwest, near the town of Virginia, Minnesota at latitude 47°33'30"N and longitude 92°31.5'30"W.

Operations commenced in 1976 as an asset of Inland Steel Company. In 1998, Ispat International purchased Inland Steel and, in 2004, merged with LNM Holdings and International Steel Group to form Mittal Steel, which in 2007 merged with Arcelor to form ArcelorMittal S.A. Minorca has been wholly owned by Cliffs since the 2020 AM USA Transaction.

34 | CLF 2024 FORM 10-K

Table of Contents

For further information, see Exhibit 96.2, Technical Report Summary on the Minorca Property, Minnesota, USA, prepared for the Company by the QP, SLR, with an effective date of December 31, 2021.

NORTHSHORE

Northshore's (100% owned) mine is located on the northeastern edge of the Mesabi Iron Range in northeastern Minnesota, approximately four miles southeast of Babbitt, Minnesota at latitude 47°40'12.15"N and longitude 91°53'1.28"W. The processing facility is approximately 41 miles to the southeast and immediately adjacent to the city of Silver Bay in Lake County, Minnesota at latitude 47°17'38.95"N and longitude 91°15'23.38"W.

The operation includes an open pit truck and shovel mine where two stages of crushing occur before the ore is transported along a wholly owned 47-mile rail line to the plant site in Silver Bay. At the plant site, two additional stages of crushing occur before the ore is sent to the concentrator. The concentrator utilizes rod mills and magnetic separation to produce a magnetite concentrate, which is delivered to the pellet plant located on-site. The plant can produce both standard and DR-grade pellets. The plant site has its own ship loading port located on Lake Superior.

The net book value of Northshore's property, plant and equipment was $230 million as of December 31, 2024.

For further information, see Exhibit 96.3, Technical Report Summary on the Northshore Property, Minnesota, USA, prepared for the Company by the QP, SLR, with an effective date of December 31, 2021.

35 | CLF 2024 FORM 10-K

Table of Contents

TILDEN

Tilden (100% owned) is located in Marquette County in Michigan’s Upper Peninsula, on the Marquette Iron Range, approximately five miles south of the city of Ishpeming, Michigan at latitude 46° 29' N and longitude 87° 40' W.

The net book value of Tilden's property, plant and equipment was $256 million as of December 31, 2024.

For further information, see Exhibit 96.5, Technical Report Summary on the Tilden Property, Michigan, USA, prepared for the Company by the QP, SLR, with an effective date of December 31, 2021.

UNITED TACONITE

United Taconite's (100% owned) mine and offices are located on Minnesota's Mesabi Iron Range just north of Eveleth, Minnesota at latitude 47°29'1.62" N, longitude 92°32'23.69" W. The processing facilities are located approximately eight miles to the southeast.

For further information, see Exhibit 96.4, Technical Report Summary on the United Taconite Property, Minnesota, USA, prepared for the Company by the QP, SLR, with an effective date of December 31, 2021.

36 | CLF 2024 FORM 10-K

Table of Contents

MINERAL RESOURCES

Mineral resources are defined under Item 1300 of Regulation S-K as a concentration or occurrence of material of economic interest in or on the Earth’s crust in such form, grade or quality, and quantity that there are reasonable prospects for economic extraction. A mineral resource is a reasonable estimate of mineralization, taking into account relevant factors such as cut-off grade, likely mining dimensions, location or continuity that, with the assumed justifiable technical and economic conditions, is likely to, in whole or part, become economically extractable.

A detailed breakdown of the mineral resources exclusive of mineral reserves is presented in the table below. Mineral resources were defined and constrained within open-pit shells, prepared by Cliffs, and based on a US$90.00/WLT pellet price, while meeting defined cut-off grade criteria and existing pellet specifications. All mineral resource estimates were reviewed and validated by the QP, SLR.

The following represents iron ore mineral resources, exclusive of mineral reserves, as of December 31, 2024 and 2023:

Iron Ore Mineral Resources

Measured Indicated Measured + Indicated Process Recovery Inferred

1Hibbing is reported at 85.3% based on our ownership level.

Reference point selected is the saleable tons based on the process recovery.

We did not have any material changes to our mineral resources during 2024. The material assumptions and criteria used for the mineral resource estimates, including but not limited to leases, permits and geotechnical pit design, are covered in more detail in Sections 11 through 13 of the respective Technical Report Summaries filed as Exhibits 96.1 through 96.5 to this Annual Report on Form 10-K.

MINERAL RESERVES

Mineral reserves are defined under Item 1300 of Regulation S-K as an estimate of tonnage and grade or quality of indicated and measured mineral resources that, in the opinion of the QP, can be the basis of an economically viable project. More specifically, it is the economically mineable part of a measured or indicated mineral resource, which includes diluting materials and allowances for losses that may occur when the material is mined or extracted.

Proven mineral reserves are defined under Item 1300 of Regulation S-K as the economically mineable part of a measured mineral resource and can only result from conversion of a measured mineral resource. Probable mineral reserves are defined under Item 1300 of Regulation S-K as the economically mineable part of an indicated and, in some cases, a measured mineral resource. All mineral reserves are classified as proven or probable and are supported by LoM plans.

Mineral reserves are based on pricing that does not exceed the three-year trailing average index price of iron pellets adjusted to realized price. We evaluate and analyze, and engage QPs to review and verify, mineral reserves in accordance with our mineral policy and SEC requirements and then complete updated LoM plans. The table below identifies the year in which the latest updated LoM plan was completed.

Mineral reserves estimates for our iron mines are constrained by fully designed open pits developed using three-dimensional modeling techniques. These open pits incorporate design slopes, practical mining shapes and access ramps to assure the accuracy of our mineral reserve estimates. All operations' mineral reserves have been adjusted net of production through year-end 2024. All mineral reserves estimates as of December 31, 2021 were reviewed and validated by the QP, SLR.

37 | CLF 2024 FORM 10-K

Table of Contents

The following represents iron ore mineral reserves as of December 31, 2024:

Iron Ore Mineral Reserves

Last LoM Plan Proven Probable Proven & Probable Process

1 Hibbing is reported at 85.3% based on our ownership level.

The material assumptions and criteria used for the mineral reserves estimates, including but not limited to leases, permits and geotechnical pit design, are covered in more detail in Sections 11 through 13 of the respective Technical Report Summaries filed as Exhibits 96.1 through 96.5 to this Annual Report on Form 10-K.

38 | CLF 2024 FORM 10-K

Table of Contents

For comparison purposes, the following represents iron ore mineral reserves as of December 31, 2023:

Iron Ore Mineral Reserves

Proven Probable Proven & Probable Process

1Hibbing is reported at 85.3% based on our ownership level.

Overall, mineral reserves estimates as of December 31, 2024, as compared to the prior-year period, decreased by 1%, which was driven by mining depletion offset by the Hibbing mine plan update.

INTERNAL CONTROLS DISCLOSURE

We demonstrated repeated attainment of annual production and quality targets for at least 45 years at each material iron ore mine operated by the Company. Internal controls the Company uses in its industry-standard approach to exploration and mineral resource and reserve estimation efforts are governed by its Mineral Reserve and Mineral Resource Estimation Policy and are detailed in Cliffs’ minimum operating standards for Resource Estimation and Strategic Mine Planning. The controls include: confirmation of drill collar locations and drill hole traces, drill logging and sample collection and security, database verification and security, QA/QC programs, internal and third-party QP statistical analysis, third-party QP model validation, and reconciliation. Modeling and analysis of the Company’s resources has been developed by Company personnel or third-party consultant SLR and reviewed by internal management and the external independent QP, SLR. Reserve estimations have been completed by Company personnel and reviewed by internal management and the QP, SLR.

Drill hole collar surveying methods have evolved with advancements in technology, moving from optical methods to global positioning system, which is currently in use. For the deposit type, all survey methods used for the collar locations are expected to provide adequate accuracy for the drill hole locations. Due to the relatively shallow depth and vertical nature of drill holes at Cliffs’ Minnesota mining operations, downhole deviation surveys are typically not conducted. Drill holes pierce the generally shallow-dipping, tabular iron formation at near perpendicular angles. At the more geologically and structurally complex Tilden mine in Michigan, where drilling deeper than 500 feet is required, downhole surveys have moved from a clay-impression procedure to the gyroscopic method currently in use.

Drill core is transported directly from the drill rig to each site’s core logging facility by either the drilling contractor or Cliffs’ personnel. Temporary core storage is located at each site’s secure logging facility. Unused sample reserves, parts, concentrates and splits are securely stored in labeled boxes or barrels at a Cliffs laboratory facility or logging facility.

Cliffs' QA/QC programs are site-specific, well-developed protocols that involve formal procedures for the use of crude material standards developed from on-site material, as well as regularly inserted coarse and concentrate duplicate samples, control chart analysis and reporting. Cliffs typically uses internal and external labs for geometallurgical analyses that are accredited with ASQ/ANSI ISO-9001:2015 (American Society for Quality/American National Standards Institute) for their system of quality management. Quality sample results are monitored and enacted on where warranted. Also, Cliffs has implemented a drill campaign reporting practice to ensure results are documented, with defined and illustrated failure metrics, outcomes of investigations, comparisons with previous year’s results and recommendations. The QP, SLR, reviewed Cliffs' QA/QC practices and provided recommendations for further work. Where QA/QC programs were still in development at that time and prior to resource estimation, Cliffs conducted data verification studies utilizing a suite of blind crude ore standards and blind duplicates from historical sample

39 | CLF 2024 FORM 10-K

Table of Contents

reserves within the LoM plan. Where unaccredited labs provided data used in resource estimation, check lab studies were initiated to verify analytical results. Cliffs is currently working toward completing alignment of QA/QC protocols at each mine to the Company’s current best practice by formalizing procedures.

Cliffs maintains exploration drill hole data in an externally-managed, access-controlled acQuire database that is backed up online at regularly scheduled intervals to provide data redundancy and security. Certification of database integrity is accomplished by both visual and statistical inspections comparing geology, assay values and survey locations cross-referenced back to laboratory data and geologic logs. Any discrepancies identified are corrected by referring to hard-copy assay and core log information archived in Cliffs' Mine Engineering department files. Prior to modeling, a secondary validation check is completed using built-in data validation routines in the modeling software.

Cliffs performs routine drill hole database verification with every new drilling program and new block model build, including: check of unique drill hole identifications and collar coordinates; check of assay or lithology points extending past the specified maximum depth of drill hole; check of abnormal dips and azimuths of downhole drill hole surveys; check of negative, overlapping and missing intervals; and check of incorrect lithologic codes and assay values.

In 2020 and 2021, Cliffs' geologists completed data verification exercises within the LoM plan area for each mining operation. This was audited by the QP, SLR, to assess accuracy and completeness. Database values were checked against source documents including collar surveys, geologic logs and assay certificates. Data verification included collar coordinates, depth intervals of geologic units and assay samples, and results of geometallurgical analyses applied to mineral resource estimation and mine planning.

Cliffs’ mineral resource estimates were validated by the QP, SLR, using standard industry techniques including statistical comparisons with composite samples and parallel nearest neighbor estimates, swath plots, as well as visual reviews in cross-section and plan. A visual review comparing blocks to drill holes for key economic variables, completed after the block modeling work, was performed to ensure general lithologic and analytical conformance. Cliffs’ mining operations have demonstrated good agreement between planned and actual product produced over more than 45 years for each operation.

Cliffs classifies the mineral resources based primarily on drill hole spacing and influenced by geologic continuity, ranges of economic criteria, and reconciliation. Some post-processing is undertaken to ensure spatial consistency and remove isolated and fringe blocks. The resource area for each operation is limited by a polygon and subsequent pit shell based on practical mining limits. To ensure that all mineral resource statements satisfy the “reasonable prospects for economic extraction” requirement, in the definition of the mineral resources under Item 1300 of Regulation S-K, factors significant to technical feasibility and potential economic viability are considered (e.g., ability to obtain permits and legal and land tenure considerations). Mineral resources are defined and constrained within optimized, open-pit shells, prepared by Cliffs and reviewed by the QP, SLR, and based on a US$90.00/WLT pellet value and target pellet iron content.

Grade and tonnage reconciliations are run on current production versus modeled production, which provides insight on the accuracy of the modeled assay data versus actual production for each mining operation.

For a discussion of comprehensive risk inherent in the estimation of mineral reserves, see Part I - Item 1A. Risk Factors - V. Sustainability and Development Risks - We rely on estimates of our recoverable mineral reserves, which are complex due to geological characteristics of the properties and the number of assumptions made.

COAL MINING AND COKEMAKING

Princeton is a coal mining complex located in West Virginia that specializes in surface and underground mining of metallurgical coal to produce coke and pulverized coal injection coal. As of December 31, 2024, we have annual rated metallurgical coal production capacity of 1.8 million net tons from our Princeton mine. During the years ended December 31, 2024 and 2023, the mine produced 1.0 million and 1.3 million net tons of coal, respectively. We own 100% of the Princeton mine, which has been operating since 1995. We own 60% of the mineral rights and lease 40% via multiple mineral leases having varying expiration dates. Mining leases are routinely renegotiated and renewed as they approach their respective expiration dates. Princeton's operations consist of three open-pit surface mines, one underground mine, a preparation plant and two rail loadouts.

Our Monessen and Warren facilities produce furnace coke and related by-products in Monessen, Pennsylvania and Warren, Ohio, respectively. We also operate cokemaking facilities located within our Burns Harbor, Lake Erie Works and Hamilton Works locations. These facilities have an aggregate annual rated capacity of 4.0 million net tons. During each of the years ended December 31, 2024 and 2023, our cokemaking facilities produced 2.4 million net tons of coke.

OTHER BUSINESSES

Our Tubular operating segment consists of our subsidiary Tubular Components, which has plants in Walbridge, Ohio and Columbus, Indiana. The Walbridge plant operates six electric resistance welded tube mills and one laser re-cutting line on owned property. The Columbus plant operates five electric resistance welded tube mills and four high-speed cold saws on leased property.

Our Tooling and Stamping operating segment consists of our subsidiary Tooling and Stamping and its related companies, which provides advanced-engineered solutions, tool design and build, hot- and cold-stamped steel components and complex assemblies for the automotive market across 10 plants, of which certain of these are under long-term lease agreements, in Ontario, Alabama, Kentucky and Tennessee. Its facilities feature eight large-bed, hot-stamping presses, providing 14 lines of production; 82 cold-stamping presses ranging from 150 net tons to 3,000 net tons of pressing capacity; 18 large-bed, high-tonnage tryout presses with

40 | CLF 2024 FORM 10-K

Table of Contents

prove-out capabilities for new tool builds; and 162 multi-axis welding assembly cells.

Our European operating segment consists of a metal distribution company that buys and sells steel, steel products and other materials. We operate out of six different European countries: the Netherlands, Italy, Germany, France, Spain and the United Kingdom.

ITEM 3. LEGAL PROCEEDINGS

LEGAL PROCEEDINGS RELATING TO OUR BUSINESS

JSW Steel Litigation.On June 8, 2021, JSW Steel filed a complaint against Cleveland-Cliffs Inc., AK Steel Holding Corporation (now known as Cleveland-Cliffs Steel Holding Corporation), Nucor Corporation and U. S. Steel in the United States District Court for the Southern District of Texas. JSW Steel alleges that the defendants engaged in a group boycott against JSW Steel in violation of federal and Texas antitrust laws by refusing to sell semi-finished steel slabs to JSW Steel, beginning in 2018 and continuing through the filing of the complaint; civil conspiracy among the defendants; and tortious interference with JSW Steel’s contractual rights and business relations involving its vendors and customers. JSW Steel’s allegations involve the tariffs and quotas imposed on steel imports by the U.S. government under Section 232 beginning in March 2018, which JSW Steel alleges raised the price of imported slabs, and statements made to the U.S. government related to exemption requests submitted by JSW Steel in 2018 and 2021. JSW Steel further claims that this alleged anticompetitive conduct negatively impacted JSW Steel’s costs, production and revenues and prevented it from pursuing expansion plans at its Ohio and Texas facilities that would compete with the defendants. JSW Steel is seeking to hold the defendants jointly and severally liable for treble damages in an amount in excess of $500 million and other relief. On February 17, 2022, the district court granted the defendants' Motions to Dismiss in their entirety and dismissed all of JSW's claims with prejudice. On March 16, 2022, JSW filed a notice of appeal to the United States Court of Appeals for the Fifth Circuit, and oral arguments on the appeal were held on February 6, 2023. We continue to believe the claims asserted against us are without merit, and we are vigorously defending against them.

Mesabi Metallics Adversary Proceeding.On September 7, 2017, Mesabi Metallics Company LLC (f/k/a Essar Steel Minnesota LLC) ("Mesabi Metallics") filed a complaint against Cleveland-Cliffs Inc. in the Essar Steel Minnesota LLC and ESML Holdings Inc. bankruptcy proceeding in the United States Bankruptcy Court, District of Delaware (the "Bankruptcy Court"). Mesabi Metallics alleged tortious interference with its contractual rights and business relations involving certain vendors, suppliers and contractors, violations of federal and Minnesota antitrust laws through monopolization, attempted monopolization and restraint of trade, violation of the automatic stay, and civil conspiracy with unnamed Doe defendants. Mesabi Metallics amended its complaint to add additional defendants, including, among others, our subsidiary, Cleveland-Cliffs Minnesota Land Development Company LLC ("Cliffs Minnesota Land"), and to add additional claims, including avoidance and recovery of unauthorized post-petition transfers of real estate interests, claims disallowance, civil contempt and declaratory relief. Mesabi Metallics seeks to hold the defendants jointly and severally liable for, among other things, antitrust damages and injunctive relief. The parties filed various dispositive motions on certain of the claims, including a motion for partial summary judgment to settle a dispute over real estate transactions between Cliffs Minnesota Land and Glacier Park Iron Ore Properties LLC ("GPIOP"). A ruling in favor of Cliffs, Cliffs Minnesota Land and GPIOP was issued on July 23, 2018, finding that Mesabi Metallics' leases had terminated and upholding Cliffs' and Cliffs Minnesota Land's purchase and lease of the contested real estate interests. Mesabi Metallics filed a Motion for Leave to File an Interlocutory Appeal, which was denied on September 10, 2019. Discovery was completed, and the parties filed cross-motions for summary judgment. On October 8, 2024, the Bankruptcy Court issued an order granting and denying parts of the cross-motions. On February 14, 2025, Mesabi Metallics' motion for the case to be withdrawn from the Bankruptcy Court and proceed in the United States District Court for the District of Delaware was granted. We continue to believe the claims asserted against us are without merit, and we intend to continue vigorously defending against all remaining claims in the lawsuit.

U. S. Steel – Nippon Steel Litigation. On January 6, 2025, U. S. Steel, Nippon Steel Corporation and Nippon Steel North America, Inc. (together with Nippon Steel Corporation, "Nippon Steel") filed a complaint in the United States District Court for the Western District of Pennsylvania against Cleveland-Cliffs Inc., Lourenco Goncalves and David McCall, the International President of the USW. The plaintiffs' lawsuit was filed in the immediate aftermath of former President Biden's issuance of an executive order blocking a proposed merger of U. S. Steel and Nippon Steel on national security grounds. The plaintiffs allege that the defendants have entered into an unlawful agreement to oppose the sale of U. S. Steel to any buyer other than Cliffs. The plaintiffs also allege that Cliffs and Mr. Goncalves, with the assistance and support of the USW, have monopolized or attempted to monopolize the markets for NOES, GOES, iron ore pellets and exposed automotive steel in North America in violation of federal antitrust laws. The plaintiffs further allege that the defendants violated and conspired to violate federal anti-racketeering laws by pursuing their alleged scheme to force U. S. Steel into an acquisition by Cliffs and monopolize the aforementioned markets. Finally, the plaintiffs allege that the defendants' speech and actions against U. S. Steel's proposed acquisition by Nippon Steel constitutes tortious interference with existing and prospective business relations. In addition to their claims for monetary relief, which include claims for treble and punitive damages, the plaintiffs have sought a preliminary injunction enjoining the defendants' alleged activities against the plaintiffs' proposed merger. At a hearing held on January 17, 2025, we successfully opposed the plaintiffs' motion to expedite proceedings, and the court entered a schedule for the parties to brief motions to dismiss the four counts in the plaintiffs' complaint that are the subject of the plaintiffs' motion for a preliminary injunction. The defendants moved to dismiss these counts on February 4, 2025, and a hearing on the motions is expected to be held on March 12, 2025. We believe the claims asserted against us are without merit, and we are vigorously defending against them.

Certain Legacy Legal Proceedings Relating to our Steel Operations. Certain of our acquired subsidiaries have been named as defendants, among many other named defendants, in numerous lawsuits filed since 1990 claiming injury allegedly resulting from

41 | CLF 2024 FORM 10-K

Table of Contents

exposure to asbestos. Similar lawsuits seeking monetary relief continue to be filed in various jurisdictions in the U.S., which cases are vigorously defended. Although predictions about the outcome of pending litigation is subject to uncertainties, based upon present knowledge, we believe it is unlikely that the resolution in the aggregate of these claims will have a material adverse effect on our consolidated results of operations, cash flows or financial condition.

LEGAL PROCEEDINGS RELATING TO ENVIRONMENTAL MATTERS

SEC regulations require us to disclose certain information about administrative or judicial proceedings involving the environment and to which a governmental authority is a party if we reasonably believe that such proceedings may result in monetary sanctions above a stated threshold. Pursuant to SEC regulations, we use a threshold of $1 million for purposes of determining whether disclosure of any such proceedings is required. We believe that this threshold is reasonably designed to result in disclosure of any such proceedings that are material to our business or financial condition.

ITEM 4. MINE SAFETY DISCLOSURES

We are committed to protecting the occupational health and well-being of each of our employees. Safety is one of our core values and we strive to ensure that safe production is the first priority for all employees. Our internal objective is to achieve zero injuries and incidents across the Company by focusing on proactively identifying needed prevention activities, establishing standards and evaluating performance to mitigate any potential loss to people, equipment, production and the environment. We have implemented intensive employee training that is geared toward maintaining a high level of awareness and knowledge of safety and health issues in the work environment through the development and coordination of requisite information, skills and attitudes. We believe that through these policies, we have developed an effective safety management system.

Under the Dodd-Frank Act, each operator of a coal or other mine is required to include certain mine safety results within its periodic reports filed with the SEC. As required by the reporting requirements included in §1503(a) of the Dodd-Frank Act and Item 104 of Regulation S-K, the information concerning mine safety and health or other regulatory matters for each of our mine locations that are covered under the scope of the Dodd-Frank Act is included in Exhibit 95 of Part IV –Item 15. Exhibits and Financial Statement Schedules of this Annual Report on Form 10-K.

42 | CLF 2024 FORM 10-K

Table of Contents

PART II

STOCK EXCHANGE INFORMATION

Our common shares (ticker symbol CLF) are listed on the NYSE (New York Stock Exchange).

HOLDERS

At February 25, 2025, we had 2,458 shareholders of record.

SHAREHOLDER RETURN PERFORMANCE

The following graph shows changes over the past five-year period in the value of $100 invested in: (1) Cliffs' common shares; (2) S&P 500 Index; (3) S&P Metals and Mining Select Industry Index; and (4) S&P MidCap 400 Index. The values of each investment are based on price change plus reinvestment of all dividends reported to shareholders, based on monthly granularity.

43 | CLF 2024 FORM 10-K

Table of Contents

ISSUER PURCHASES OF EQUITY SECURITIES

The following table presents information with respect to repurchases by the Company of our common shares during the periods indicated:

ITEM 6. [Reserved]

44 | CLF 2024 FORM 10-K

Table of Contents

Management's Discussion and Analysis of Financial Condition and Results of Operations is designed to provide a reader of our financial statements with a narrative from the perspective of management on our financial condition, results of operations, liquidity and other factors that may affect our future results. The following discussion should be read in conjunction with the consolidated financial statements and related notes that appear in Part II – Item 8. Financial Statements and Supplementary Data of this Annual Report on Form 10-K.

Management's Discussion and Analysis of Financial Condition and Results of Operations included in this report discusses our financial condition and results of operations as of and for the years ended December 31, 2024 and 2023. A discussion related to our financial condition and results of operations for 2023 as compared to 2022 can be found in Part II - Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations of our Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on February 8, 2024.

OVERVIEW

Throughout 2024, we continued to position the Company for long-term success and further established ourselves as a leading North America based steel producer. We completed the Stelco Acquisition, which diversifies our end-markets, expands our geographical presence in Canada and incorporates Stelco's industry low-cost structure into our overall asset portfolio. We also announced new strategic initiatives that are expected to provide meaningful earnings improvement in years to come; reduced our operational costs; returned substantial capital to shareholders through share repurchases; and announced new GHG emissions reduction targets after achieving our prior commitments, all with an eye toward the future and in line with our consistent strategic objectives. The Stelco Acquisition, our operational achievements and strategic initiatives further strengthen our position as a North American leader in the steel industry and are expected to create value for all Company stakeholders.

2024 HIGHLIGHTS

•Record safety year since becoming a steel company with lowest Total Reportable Incident Rate of 0.9, which represents a 26% improvement from prior year

•Completed the Stelco Acquisition during the fourth quarter of 2024

•Further reduced unit costs year-over-year

•Returned $733 million in capital to shareholders through share repurchases

•Announced new GHG emissions reduction goals

•Selected by the DOE for award negotiations to receive up to $575 million for two decarbonization initiatives

•Announced $600 million of future annual EBITDA improvement from strategic projects expected to be completed by the end of 2029

•Announced project to develop new state-of-the-art electrical transformer production plant in Weirton, West Virginia

•Completed successful hydrogen injection trial at Indiana Harbor #7 blast furnace

We continued our best practices from both a safety and environmental standpoint. During 2024, our safety Total Reportable Incident Rate (including contractors) was 0.9 per 200,000 hours worked, the lowest since becoming a steel company in 2020.

Throughout 2024, we continued to focus on our goal of reducing GHG emissions with our optimal utilization of HBI and scrap throughout our facilities, as well as efficient power generation through recycling off-gases. In May 2024, we announced our commitment to new GHG emissions reductions targets after we successfully achieved our prior commitments set in 2021. We have also continued our partnerships with the DOE as part of the Better Climate Challenge initiative and the DOE Better Plants programs. We continue to evaluate opportunities such as carbon capture and the use of hydrogen within our facilities. With the U.S. government potentially awarding funding for the development of regional hydrogen hubs throughout the country, including near our largest facilities, we would be able to dramatically increase our use of hydrogen gas as both a reducing agent and energy source as the clean hydrogen production facilities come online and become commercially and economically viable. Additionally, we have continued forming partnerships to develop renewable and clean energy sources – such as wind, solar and hydrogen – which will benefit our own environmental footprint while combating the global impacts of climate change.

45 | CLF 2024 FORM 10-K

Table of Contents

FINANCIAL SUMMARY

The following is a summary of our consolidated results for the years ended December 31, 2024, 2023 and 2022 (in millions, except for diluted EPS):

Total Revenue Net Income Adjusted EBITDA Diluted EPS

See "— Non-GAAP Financial Measures" below for a reconciliation of our Net income (loss) to Adjusted EBITDA.

ECONOMIC OVERVIEW

STEEL MARKET OVERVIEW

Steel market conditions in 2024 were driven by weaker than anticipated light vehicle production, lower demand and higher import levels. The price for domestic HRC, the most significant index impacting our revenues and profitability, averaged $772 per net ton for 2024, which was 15% lower than 2023 and the lowest annual average per net ton since 2020. Import levels were elevated in 2024, which contributed to downward pressure on HRC pricing. North American light vehicle production of 15.4 million units in 2024 was down from 15.7 million units in 2023 and significantly lower than the original expectation to exceed 16 million units. Looking forward, we expect domestic steel demand to grow as interest rates have started to decline, steel imports are currently unattractive, other end-user demand is improving, and incremental steel demand stimulated by recent government legislation and manufacturing on-shoring is realized.

The Infrastructure and Jobs Act, the CHIPS Act and the Inflation Reduction Act should provide meaningful support for overall domestic steel demand for years to come. Our extensive portfolio of products should result in increased steel demand from most of our end markets. As passed initially, the Infrastructure and Jobs Act includes approximately $550 billion of authorized spending for new investments and programs. This legislation provides direct spending support for roads, bridges and other infrastructure projects, including upgrades to the domestic power grid. The CHIPS Act promotes semiconductor manufacturing in the U.S., which should help support non-residential construction as well as machinery and equipment. The Inflation Reduction Act provides incentives for the use of domestic steel for investments in clean energy projects, including wind and solar projects, which consume a substantial amount of steel. Additionally, the on-shoring of manufacturing in the U.S. should prompt more domestic steel demand as well as reduce the risk of supply chain issues in the future.

OTHER KEY DRIVERS

The largest market for our steel products is the automotive industry in North America, which makes light vehicle production a key driver of demand. Light vehicle production in 2024 was well below initial expectations. North American light vehicle production in 2024 was 15.5 million units, down from 15.7 million units in 2023. North American light vehicle production in 2025 and beyond is expected to remain above 15 million units annually. During 2024, light vehicle sales in the U.S. saw an average seasonally adjusted annualized rate of 15.8 million units sold, representing a 2% increase compared to 2023. December 2024 seasonally adjusted annualized rate was 16.8 million units sold, the highest published rate since 2021, indicating healthy consumer demand. Additionally, the average age of light vehicles on the road in the U.S. is at an all-time high of 12.6 years, surpassing the previous record set in 2023, which should support demand as older vehicles need to be replaced. As a leading supplier of automotive-grade steel in the U.S., we expect to benefit from healthy vehicle production over the coming years.

Since 2021, the price for busheling scrap, a necessary input for flat-rolled steel production in EAFs in the U.S., has continued to average well above the prior annual ten-year average of approximately $400 per long ton. The busheling price averaged $429 per long ton during 2024. We expect the supply of busheling scrap to further tighten due to decreasing prime scrap generation from original equipment manufacturers and the growth of EAF capacity in the U.S., reduced metallics import availability, and a push for expanded scrap use globally. As we are fully integrated and have primarily a blast furnace footprint, increased prices for busheling scrap in the U.S. bolster our competitive advantage, as we source the majority of our iron feedstock from our stable-cost mining and pelletizing operations in Minnesota and Michigan.

As for iron ore, the Platts 62% price averaged $109 per metric ton in 2024, which is 15% higher than the prior annual ten-year average. While higher iron ore prices play a role in increased steel prices, we also directly benefit from higher iron ore prices for the portion of iron ore pellets we sell to third parties.

46 | CLF 2024 FORM 10-K

Table of Contents

OTHER FACTORS

On February 10, 2025, President Donald Trump signed an executive order to implement 25% tariffs on all steel imports without exceptions or exemptions, beginning March 2025. We expect these steel tariffs will help level the playing field against countries that have long taken advantage of the domestic steel market. A level playing field in steel, along with President Trump's pro-manufacturing and America-first agenda, should support a healthy domestic steel environment for years to come.

On April 4, 2024, the DOE issued its final transformer efficiency standards rule that will provide for the continued utilization of GOES in virtually all of our distribution transformer end markets. With the revised rule, the DOE acknowledged the fundamental importance of GOES and the essential role played by our steel plants in Butler, Pennsylvania and Zanesville, Ohio in effectively sustaining the functionality of the U.S. electric grid. The originally proposed distribution transformer rule would have required the use of amorphous metal in nearly all transformer production in the U.S., putting demand for our GOES product at serious risk. The final rule provides clarity going forward on production requirements, allowing for increased investments in the transformer market, such as our announced project at Weirton, which should ultimately lead to increased GOES demand.

During 2024, we continued our cost cutting efforts, which began in 2023, further reducing our year-over-year cost per ton as we worked through higher cost inventory and lower natural gas, coal and alloy costs mitigated any inflationary cost increases.

STEELMAKING RESULTS

COMPARISON OF 2024 TO 2023

The following is a summary of the Steelmaking segment operating results, net of intersegment eliminations, for the years ended December 31, 2024 and 2023 (dollars in millions, except for average selling price and shipments in thousands of net tons):

Total Revenue Gross Margin Adjusted EBITDA Steel Shipments (nt)

47 | CLF 2024 FORM 10-K

Table of Contents

REVENUE

The following tables represent our steel shipments by product and total revenues by market:

Year Ended December 31,

(In thousands of net tons) 2024 2023 % Change

Steel shipments by product:

Stainless and electrical steel 567 682 (17) %

Slab and other steel products 1,680 1,772 (5) %

Year Ended December 31,

Steelmaking revenues by market:

Infrastructure and manufacturing 5,208 5,612 (7) %

Revenues from our Steelmaking segment decreased by 13% during the year ended December 31, 2024, as compared to the prior year, primarily due to:

•A decrease of $1.9 billion, or 25%, in revenues from the direct automotive market, predominantly due to a decrease in demand;

•A decrease of $404 million, or 7%, in revenues from the infrastructure and manufacturing market, predominantly due to a decrease in steel index pricing; and

•A decrease of $480 million, or 16%, in revenues from the steel producers market, predominantly due to the decrease in pricing indices for slabs and busheling scrap.

GROSS MARGIN

Gross margin from our Steelmaking segment decreased by $1.3 billion, during the year ended December 31, 2024, as compared to the prior year, primarily due to:

•A decrease in average selling price (approximately $775 million impact), predominantly due to lower spot prices and lower direct automotive mix; and

•A decrease in sales volume (approximately $500 million impact).

ADJUSTED EBITDA

Adjusted EBITDA from our Steelmaking segment for the year ended December 31, 2024, decreased by $1.1 billion, as compared to 2023, due to the decreased gross margin from our operations. Additionally, our Steelmaking Adjusted EBITDA included $457 million and $549 million of Selling, general and administrative expenses for the years ended December 31, 2024 and 2023, respectively.

CONSOLIDATED RESULTS

COMPARISON OF 2024 TO 2023

REVENUES AND GROSS MARGIN

During the year ended December 31, 2024, our consolidated Revenues decreased by $2.8 billion, as compared to 2023. The decrease was primarily due to the decrease in the average steel product selling price of $90 per net ton and a decrease of 0.8 million net tons of steel shipments from our Steelmaking segment.

During the year ended December 31, 2024, our consolidated gross margin decreased by $1.3 billion, as compared to 2023. See "— Steelmaking Results" above for further detail on our operating results.

48 | CLF 2024 FORM 10-K

Table of Contents

SELLING, GENERAL AND ADMINISTRATIVE EXPENSES

Selling, general and administrative expenses decreased by $91 million during the year ended December 31, 2024, as compared to 2023. The decrease primarily relates to employment-related costs due to lower incentive compensation.

RESTRUCTURING AND OTHER CHARGES & ASSET IMPAIRMENT

On February 15, 2024, we announced the indefinite idle of our Weirton tinplate production plant. This resulted in restructuring and other charges primarily related to severance, other employee-related benefits and asset retirement obligation charges of $129 million for the year ended December 31, 2024. Additionally, this resulted in an asset impairment of $79 million for year ended December 31, 2024.

ACQUISITION-RELATED COSTS

The increase of Acquisition-related costs primarily relates to third-party expenses associated with the Stelco Acquisition in 2024. Refer to NOTE 3 - ACQUISITIONS for further information.

GOODWILL IMPAIRMENT

In 2023, our annual goodwill impairment analysis resulted in an impairment charge of $125 million for goodwill related to our Tooling and Stamping reporting unit.

MISCELLANEOUS – NET

Miscellaneous expense increased by $88 million for the year ended December 31, 2024, as compared to 2023. The increase in miscellaneous expense for the year ended December 31, 2024 was primarily related to a $63 million gain on sale of business in 2023, which was not repeated in 2024. Additionally, to a lesser extent, this increase was also due to higher currency exchange expense, primarily related to routine remeasurement of an intercompany note with our Stelco subsidiary during 2024.

INTEREST EXPENSE, NET

During the year ended December 31, 2024, our consolidated Interest expense, net increased by $81 million compared to 2023. The increase primarily relates to increased interest incurred on outstanding borrowings, year over year, as well as fees incurred in 2024 associated with financing arrangements undertaken in connection with the Stelco Acquisition.

LOSS ON EXTINGUISHMENT OF DEBT

During the year ended December 31, 2024, our consolidated Loss on extinguishment of debt increased by $27 million compared to 2023. The increase entirely relates to the repurchase of $829 million aggregate principal amount of our then-outstanding 6.750% 2026 Senior Secured Notes. Refer to NOTE 8 - DEBT AND CREDIT FACILITIES for further information.

NET PERIODIC BENEFIT CREDITS OTHER THAN SERVICE COST COMPONENT

During the year ended December 31, 2024, our consolidated Net periodic benefit credits other than service cost component increased $43 million compared to 2023. This increase primarily relates to an increase in actuarial gains reclassified from AOCI to net income and a decrease in interest cost year over year. Refer to NOTE 9 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS for further information.

OTHER NON-OPERATING INCOME (LOSS)

During the year ended December 31, 2024, our consolidated Other non-operating income (loss) decreased by $42 million compared to 2023. The decrease primarily relates to a loss recorded in 2024 as a result of a fair value adjustment of the MinnTac option, as well as a loss recorded on foreign currency contracts obtained in connection with financing the Stelco Acquisition. Refer to NOTE 14 - FAIR VALUE OF FINANCIAL INSTRUMENTS and NOTE 15 - DERIVATIVE INSTRUMENTS AND HEDGING for further information.

INCOME TAXES

Our effective tax rate is impacted by state income taxes and permanent items, primarily depletion. It also is affected by discrete items that may occur in any given period but are not consistent from period to period. The following represents a summary of our tax provision and corresponding effective rates:

Year Ended December 31,

Income tax benefit (expense) $ 235 $ (148)

Effective tax rate 25 % 25 %

49 | CLF 2024 FORM 10-K

Table of Contents

A reconciliation of our income tax attributable to continuing operations compared to the U.S. federal statutory rate is as follows:

Year Ended December 31,

Increase (decrease) due to:

Percentage depletion in excess of cost depletion (20) 2 (32) (5)

Valuation allowance — — 14 2

Unrecognized tax benefits 7 — 7 1

Federal & state provision to return (4) — (20) (3)

Income not subject to tax (10) 1 (11) (2)

Goodwill impairment — — 26 4

The increase in income tax benefit in 2024, as compared to income tax expense in 2023, is predominantly related to the decrease in the pre-tax book income year-over-year. See NOTE 11 - INCOME TAXES for further information.

CASH FLOW, LIQUIDITY AND CAPITAL RESOURCES

OVERVIEW

Our capital allocation decision-making process is focused on preserving healthy liquidity levels, strengthening our balance sheet, and creating financial flexibility to manage through the cyclical demand for our products and volatility in commodity prices. We are focused on maximizing the cash generation of our operations, reducing debt, returning capital to shareholders and aligning capital investments with our strategic priorities and the requirements of our business plan, including regulatory and permission-to-operate related projects.

The following table provides a summary of our cash flow:

Year Ended December 31,

Cash flows provided by (used in):

Net increase (decrease) in cash and cash equivalents $ (137) $ 172

1See "— Non-GAAP Financial Measures" for a reconciliation of our free cash flow.

The market environment in 2024 provided us the ability to take advantage of favorable debt markets and return capital to shareholders, as follows:

•During the first quarter of 2024, we issued $825 million aggregate principal amount of our 7.000% 2032 Senior Notes at par. A portion of the net proceeds from the 7.000% 2032 Senior Notes issuance was used to repurchase our 6.750% 2026 Senior Secured Notes. We no longer have any secured notes outstanding.

•During the second half of 2024, we issued an additional $600 million aggregate principal amount of our 7.000% 2032 Senior Notes at 99.25% of their principal amount, $900 million aggregate principal amount of 6.875% Senior Notes due 2029 at par, and $900 million aggregate principal amount of 7.375% Senior Notes due 2033 at par. The net proceeds from these transactions were used to finance a portion of the cash consideration payable in connection with the Stelco Acquisition, which we completed on November 1, 2024.

•During the first quarter of 2025, we issued $850 million aggregate principal amount of 7.500% Senior Notes due 2031 at par. The net proceeds will be used for general corporate purposes, including the repayment of borrowings under our ABL Facility.

•Additionally, during the year ended December 31, 2024, we returned capital to shareholders through our share repurchase programs, repurchasing 37.9 million common shares at a cost of $733 million in the aggregate.

50 | CLF 2024 FORM 10-K

Table of Contents

Our financial flexibility has allowed us to remain active in our opportunistic pursuit of value-enhancing mergers and acquisitions. During 2024, we completed the Stelco Acquisition, which diversifies our end markets, expands our geographical presence in Canada and incorporates Stelco's industry low-cost structure into our overall asset portfolio. We have a track record of demonstrating that we can quickly deleverage our balance sheet following prior acquisitions. We expect to generate healthy free cash flow in the coming years and intend to utilize it to deleverage our balance sheet following the Stelco Acquisition. Going forward, we will continue to use the financial levers available to us in order to continue to pursue assets that would grow our business, reduce our debt, and return capital to shareholders.

CASH FLOWS

OPERATING ACTIVITIES

Year Ended December 31,

Non-cash adjustments to net income (loss) 1,030 1,125 (95)

Pension and OPEB payments and contributions (195) (94) (101)

Net cash provided by operating activities $ 105 $ 2,267 $ (2,162)

The variance was driven by:

•A $1.3 billion decrease in net income after adjustments for non-cash items due to lower gross margins resulting from a decrease in selling prices and sales volumes for our steel products. See "— Steelmaking Results" above for further detail on our operating results.

•A $669 million decrease in cash provided for working capital is primarily related to ending inventory levels remaining consistent year over year. This differs from the prior year when inventory levels decreased significantly. This prior year decrease was primarily the result of lower costs of steel, driven by higher production, cost control and lower raw material costs.

INVESTING ACTIVITIES

Year Ended December 31,

Purchase of property, plant and equipment $ (695) $ (646) $ (49)

Acquisitions, net of cash acquired (2,512) — (2,512)

Net cash used by investing activities $ (3,212) $ (591) $ (2,621)

The variance was driven by:

Source: SEC EDGAR (public domain) · 10-K for the period ended 2024-12-31, filed 2025-02-25 · accession 0000764065-25-000058

Filing HTML rendered to line-structured narrative text by the shipped reducer (datafeeds.edgar_fulltext.visible_text, keep_table_headers=True): scripts and inline-XBRL headers are dropped, and table content is reduced to its short label cells — numeric table data is not rendered and is therefore not counted. The same rendering is used for every year, so a year-over-year comparison is like for like.

The text is our rendering of the filing, not a facsimile: original pagination, typography and tables are not reproduced, and the numbers live in the financial statements (FA).

The outline locates item HEADINGS in this document. Only Items 1A and 7 have certified boundaries elsewhere in the terminal (the redline and the narrative-overlap number); every span here runs from one heading found to the next heading found.

How the outline was chosen. It is the longest chain of item headings that runs forward through both the document and the standard item order: 18 headings are on that chain and 17 further heading-shaped lines are not — the table-of-contents echo of every item, cross-references and exhibit-list mentions. Each entry's length is measured from its heading to the next heading on the chain.