10-K

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D. C. 20549

FORM 10-K

(Mark One)

Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) (only applicable to Spire Inc.):

Title of each class Trading Symbol(s) Name of each exchange on which registered

Common Stock $1.00 par value SR New York Stock Exchange LLC

Securities registered pursuant to Section 12(g) of the Exchange Act: None

Indicate by check mark if each registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act of 1933, as amended.

Indicate by check mark if each registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.

Indicate by check mark whether each registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Indicate by check mark whether each registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

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Indicate by check mark whether each registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Spire Inc. ☒ ☐ ☐ ☐ ☐

Spire Missouri Inc. ☐ ☐ ☒ ☐ ☐

Spire Alabama Inc. ☐ ☐ ☒ ☐ ☐

If an emerging growth company, indicate by check mark if each registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Spire Inc. ☐ Spire Missouri Inc. ☐ Spire Alabama Inc. ☐

Indicate by check mark whether each registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.

Spire Inc. ☒ Spire Missouri Inc. ☐ Spire Alabama Inc. ☐

If securities are registered pursuant to Section 12(b) of the Exchange Act, indicate by check mark whether the financial statements of each registrant included in the filing reflect the correction of an error to previously issued financial statements.

Spire Inc. ☐ Spire Missouri Inc. ☐ Spire Alabama Inc. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b).

Spire Inc. ☐ Spire Missouri Inc. ☐ Spire Alabama Inc. ☐

Indicate by check mark whether each registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

The aggregate market value of the common equity held by non-affiliates of Spire Inc. amounted to $4,420,436,221 as of March 31, 2025. All of Spire Missouri Inc.’s and Spire Alabama Inc.’s equity securities are owned by Spire Inc., their parent company and a reporting company under the Exchange Act.

The number of shares outstanding of each registrant’s common stock, as of November 10, 2025, was as follows:

Spire Inc. Common Stock, par value $1.00 per share 59,038,129

This combined Form 10-K represents separate filings by Spire Inc., Spire Missouri Inc., and Spire Alabama Inc. Information contained herein relating to an individual registrant is filed by that registrant on its own behalf. Each registrant makes no representation as to information relating to the other registrants, except that information relating to Spire Missouri Inc. and Spire Alabama Inc. is also attributed to Spire Inc.

Spire Missouri Inc. and Spire Alabama Inc. meet the conditions set forth in General Instructions I(1)(a) and (b) of Form 10-K and are therefore filing this Form 10-K with the reduced disclosure format specified in General Instructions I(2) to Form 10-K.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of proxy statement for Spire Inc. to be filed on or about December 16, 2025 — Part III.

Certain exhibits as indicated in Part IV.

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Page

GLOSSARY OF KEY TERMS AND ABBREVIATIONS 2

PART I 3

FORWARD-LOOKING STATEMENTS 3

Item 1 Business 4

Item 1A Risk Factors 10

Item 1B Unresolved Staff Comments 21

Item 1C Cybersecurity 21

Item 2 Properties 22

Item 3 Legal Proceedings 22

Item 4 Mine Safety Disclosures 22

Information about our Executive Officers (Item 401(b) of Regulation S-K) 23

Item 6 (Reserved) 25

Item 7A Quantitative and Qualitative Disclosures About Market Risk 39

Item 8 Financial Statements and Supplementary Data 40

Item 9A Controls and Procedures 108

Item 9B Other Information 109

Item 9C Disclosure Regarding Foreign Jurisdictions that Prevent Inspections 109

Item 10 Directors, Executive Officers and Corporate Governance 110

Item 11 Executive Compensation 110

Item 14 Principal Accounting Fees and Services 110

Item 15 Exhibits, Financial Statement Schedules 111

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GLOSSARY OF KEY TERMS AND ABBREVIATIONS

APSC Alabama Public Service Commission NYSE New York Stock Exchange

ASC Accounting Standards Codification O&M Operation and maintenance expense

ASU Accounting Standards Update OCI Other comprehensive income or loss

CCM Cost Control Measure PGA Purchased Gas Adjustment

EPS Earnings per share SEC U.S. Securities and Exchange Commission

ESR Enhanced Stability Reserve Spire Spire Inc.

FASB Financial Accounting Standards Board SpireAlabama Spire Alabama Inc.

GSA Gas Supply Adjustment SpireMissouri Spire Missouri Inc.

MMBtu Million British thermal units U.S. United States

MSPSC Mississippi Public Service Commission

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PART I

FORWARD-LOOKING STATEMENTS

Certain matters discussed in this report, excluding historical information, include forward-looking statements. Certain words, such as “may,” “anticipate,” “believe,” “estimate,” “expect,” “intend,” “plan,” “seek,” “target,” and similar words and expressions identify forward-looking statements that involve uncertainties and risks. Future developments may not be in accordance with our current expectations or beliefs and the effect of future developments may not be those anticipated. Among the factors that may cause results or outcomes to differ materially from those contemplated in any forward-looking statement are:

•

Weather conditions and catastrophic events, particularly severe weather in U.S. natural gas producing areas;

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Volatility in gas prices, particularly sudden and sustained changes in natural gas prices, including the related impact on margin deposits associated with the use of natural gas derivative instruments, and the impact on our competitive position in relation to suppliers of alternative heating sources, such as electricity;

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Changes in gas supply and pipeline availability, including as a result of decisions by natural gas producers to reduce production or shut in producing natural gas wells and expiration or termination of existing supply and transportation arrangements that are not replaced with contracts with similar terms and pricing, as well as other changes that impact supply for and access to the markets in which our subsidiaries transact business;

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Acquisitions may not achieve their intended results;

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Legislative, regulatory and judicial mandates and decisions, some of which may be retroactive, including those affecting:

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allowed rates of return and recovery of prudent costs,

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incentive regulation,

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industry structure,

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purchased gas adjustment provisions,

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rate design structure and implementation,

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capital structures established for rate-setting purposes,

•

regulatory assets and liabilities,

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non-regulated and affiliate transactions,

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franchise renewals,

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authorization to operate facilities,

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environmental or safety matters, including the potential impact of legislative and regulatory actions related to climate change and pipeline safety and security,

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taxes,

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pension and other postretirement benefit liabilities and funding obligations, or

•

accounting standards;

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The results of litigation;

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The availability of and access to, in general, funds to meet our debt obligations prior to or when they become due and to fund our operations and necessary capital expenditures, either through (i) cash on hand, (ii) operating cash flow, or (iii) access to the capital markets;

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Retention of, ability to attract, ability to collect from, and conservation efforts of, customers;

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Our ability to comply with all covenants in our indentures and credit facilities any violations of which, if not cured in a timely manner, could trigger a default of our obligations;

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Energy commodity market conditions;

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Discovery of material weakness in internal controls;

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The disruption, failure or malfunction of our operational and information technology systems, including due to cyberattacks; and

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Employee workforce issues, including but not limited to labor disputes, the inability to attract and retain key talent, and future wage and employee benefit costs, including costs resulting from changes in discount rates and returns on benefit plan assets.

Readers are urged to consider the risks, uncertainties, and other factors that could affect our business as described in this report. All forward-looking statements made in this report rely upon the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995. We do not, by including this statement, assume any obligation to review or revise any particular forward-looking statement in light of future events.

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Item 1. Business

OVERVIEW

Spire Inc. (“Spire” or the “Company”) was formed in 2000 and is the holding company for Spire Missouri Inc. (“Spire Missouri”), Spire Alabama Inc. (“Spire Alabama”), other gas utilities, and gas-related businesses. Spire Missouri was formed in 1857, and Spire Alabama was formed in 1948 by the merger of two gas companies. Spire is committed to transforming its business and pursuing growth through growing organically, investing in infrastructure, and advancing through innovation. The Company has three reportable business segments: Gas Utility, Gas Marketing and Midstream, which are further described below.

The Gas Utility segment includes the regulated operations of Spire Missouri, Spire Alabama, Spire Gulf Inc. (“Spire Gulf”) and Spire Mississippi Inc. (“Spire Mississippi”) (collectively, the “Utilities”). Due to the seasonal nature of the Utilities’ business and the volumetric Spire Missouri rate design, earnings of Spire and each of the Utilities are typically concentrated during the heating season of November through April of each fiscal year.

The Gas Marketing segment includes Spire Marketing Inc. (“Spire Marketing”), a wholly owned subsidiary providing natural gas marketing services.

The Midstream segment includes Spire STL Pipeline LLC (“Spire STL Pipeline”), Spire MoGas Pipeline LLC (“Spire MoGas Pipeline”), and Spire Storage (consisting of the operations of Spire Storage West LLC and Spire Storage Salt Plains LLC), which are subsidiaries engaged in the transportation and storage of natural gas.

Other components of the Company’s consolidated information include Spire’s subsidiaries engaged in the operation of a propane pipeline and risk management, among other activities, and unallocated corporate items, including certain debt and associated interest costs.

Company News and Information

Spire uses its website, SpireEnergy.com, as its primary channel for distribution of important information including news releases, analyst presentations and financial information. The information Spire, Spire Missouri and Spire Alabama file or furnish to the United States (U.S.) Securities and Exchange Commission ("SEC"), including annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and their amendments, and proxy statements are available free of charge under “Filings & Reports” in the Investors section of Spire’s website, SpireEnergy.com, as soon as reasonably practical after the information is filed with or furnished to the SEC. Information contained on Spire’s website is not incorporated by reference in this report. The SEC also maintains a website that contains Spire’s SEC filings (sec.gov).

Human Capital Resources

As of September 30, 2025, Spire had 3,497 employees, including 1,956 for Spire Missouri and 748 for Spire Alabama. We believe that:

the safety and well-being of our employees, customers and communities is one of our most important responsibilities,

the development, education and advancement of employees is key to delivering a strong energy future, and

inclusion is a core value, embracing differences and fostering a sense of belonging for each other and those we serve.

We continue to implement processes, procedures and programs that reflect our focus on consistently reducing our employee injury and motor vehicle accident rates. Our Good Catch program and Field Safety Observations encourage employees to proactively identify, mitigate and report workplace hazards, reducing potential work-related injuries. We also utilize safety cameras in all Company vehicles, which are accompanied by real-time, in-cab driver alerts and virtual and managed driver coaching, to promote safe driving habits. In 2025, core driving metrics showed significant improvements in areas of speed, following distance, distracted driving and positive driving behaviors. Also in 2025, senior management significantly increased engagement with safety leaders throughout the Company in new and more direct ways to promote safety awareness, communications, alignment of priorities and to address pressing issues in the field.

Supporting wellness, we offer incentives for weight management and gym membership, as well as employee assistance programs to provide counseling services and emotional support, and we have a formalized comprehensive well-being program that focuses on the physical, emotional, social and financial health of every employee.

All employees have access to a comprehensive suite of development resources, including customized training programs, developmental assessments, specialized degree opportunities, and partnerships with leading organizations offering industry-specific courses, leadership and management workshops, and computer application development seminars. In

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2025, Spire delivered tailored leadership development programs across all organizational levels. For directors, managing directors, and officers, we continued our Leadership Development Series, emphasizing inclusive leadership and exemplary management practices. For leaders in field operations, we facilitated the Leading the Field program, which combines two-day, instructor-led sessions with computer-based training and structured manager engagement. Frontline leaders participated in the Leading Spire Series, designed to enhance leadership capabilities, business acumen, and people management skills. Additionally, with the exception of officers, all employees are eligible for up to $6,000 annually in tuition assistance and have access to the Spire Learning Center, our internal learning management system that supports ongoing education and skill development. In their first year, each construction and maintenance employee receives 80 hours of safety training, while each service and installation employee receives 200 hours of training. Field operations employees average 24 hours of technical and procedural training annually.

Our Human Rights Policy demonstrates that Spire understands its universal responsibility to respect human rights and provides the basis for publicly affirming our values and embedding the responsibility into Spire’s operations and the way we do business.

The Company believes labor relations with its employees are good. Should that condition change, the Company could experience labor disputes, work stoppages or other disruptions that could negatively impact the Company’s system operations, customer service, results of operations and cash flows.

The following table presents the Company’s various labor agreements as of September 30, 2025.

Employees Contract Start Contract End

Union Local Covered Date Date

Spire Missouri

Total Spire Missouri 1,521

Spire Alabama

Total Spire Alabama 389

Spire Gulf

GAS UTILITY

Overview

Spire Missouri is a public utility engaged in the purchase, retail distribution and sale of natural gas. Spire Missouri is the largest natural gas distribution utility system in Missouri, serving approximately 1.2 million residential, commercial and industrial customers in St. Louis, Kansas City, and other areas in Missouri. Spire Missouri purchases natural gas in the wholesale market from producers and marketers and ships the gas through interstate pipelines into its own distribution facilities for sale to residential, commercial and industrial customers. Spire Missouri also transports gas through its distribution system for certain larger customers who buy their own gas on the wholesale market. Spire Missouri delivers natural gas to customers at rates and in accordance with tariffs authorized by the Missouri Public Service Commission ("MoPSC"), primarily through rate cases that can take up to eleven months to be finalized. The earnings of Spire Missouri are primarily generated by the sale of heating energy.

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Spire Alabama is a public utility engaged in the purchase, retail distribution and sale of natural gas principally in central and northern Alabama, serving more than 0.4 million residential, commercial and industrial customers. Spire Alabama is the largest natural gas distribution utility in the state of Alabama and is regulated by the Alabama Public Service Commission ("APSC"). Among the cities served by Spire Alabama are Birmingham, the center of the largest metropolitan area in the state, and Montgomery, the state capital. Spire Alabama purchases natural gas through interstate and intrastate suppliers and distributes the purchased gas through its distribution facilities for sale to residential, commercial, and industrial customers and other end-users of natural gas. Spire Alabama also transports gas through its distribution system for certain large commercial and industrial customers for a transportation fee. For most of these transportation service customers, Spire Alabama also purchases gas on the wholesale market for sale to the customer upon delivery to the Spire Alabama distribution system. All Spire Alabama services are provided to customers at rates and in accordance with tariffs authorized by the APSC.

Spire Gulf and Spire Mississippi (collectively, “Spire EnergySouth”) are utilities engaged in the purchase, retail distribution and sale of natural gas to 0.1 million customers in the Mobile, Alabama area and south-central Mississippi. Spire Gulf is regulated by the APSC, and Spire Mississippi is regulated by the Mississippi Public Service Commission ("MSPSC").

The Utilities seek to provide reliable natural gas services at a reasonable cost, while maintaining and building secure and dependable infrastructures. The Utilities’ strategies focus on improving both performance and the ability to recover their authorized distribution costs and rates of return. The Utilities’ distribution costs are the essential, primarily fixed, expenditures they must incur to operate and maintain more than 60,000 miles of mains and services comprising their natural gas distribution systems and related storage facilities. The Utilities’ distribution costs include wages and employee benefit costs, depreciation and maintenance expenses, and other regulated utility operating expenses, excluding natural and propane gas expense. Distribution costs are considered in the rate-making process, and recovery of these types of costs is included in revenues generated through the Utilities’ tariff rates approved by their respective public service commissions.

Spire Missouri and Spire Alabama also have off-system sales and capacity-released income streams that are regulated by tariff but remain subject to fluctuations in market conditions. Some of the factors impacting the level of off-system sales include the availability and cost of Spire’s natural gas supply, the weather in its service areas and the weather in other markets. When Spire’s service areas experience warmer-than-normal weather while other markets experience colder weather or supply constraints, some of Spire’s natural gas supply is available for sale to third parties not on Spire’s system.

The Utilities work actively to reduce the impact of wholesale natural gas price volatility on their costs by strategically structuring their natural gas supply portfolios to increase their gas supply availability and pricing alternatives. They may also use derivative instruments to hedge against significant changes in the commodity price of natural gas. Nevertheless, the overall cost of purchased gas remains subject to fluctuations in market conditions. The Purchased Gas Adjustment ("PGA") clause of Spire Missouri, Spire Gulf and Spire Mississippi and the Gas Supply Adjustment ("GSA") rider of Spire Alabama allow the Utilities to flow through to customers, subject to prudence review by the public service commissions, the cost of purchased gas supplies, including costs, cost reductions and related carrying costs associated with the use of derivative instruments to mitigate volatility in the cost of natural gas. As of September 30, 2025, Spire Missouri had active derivative positions, but Spire Alabama has had no gas supply derivative instrument activity since 2010. The Utilities believe they will continue to be able to obtain sufficient gas supply. The price of natural gas supplies and other economic conditions may affect sales volumes, due to the conservation efforts of customers, and cash flows associated with the timing of collection of gas costs and related accounts receivable from customers.

Operating Revenues, Customers, Franchises and Competition

The following tables present information on Spire’s revenues and volume sold and transported (before intersegment eliminations), and annual average numbers of customers for the three years ended September 30, 2025, 2024 and 2023.

Gas Utility Operating Revenues

Commercial & Industrial 23 % 24 % 25 %

Transportation 6 % 5 % 5 %

Other 5 % 5 % 3 %

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Gas Utility Volume Sold and Transported

Total annual average number of customers for Spire Missouri and Spire Alabama for fiscal 2025 was 1,213,375 and 429,628, respectively.

Spire Missouri is the only distributor of natural gas within its franchised service areas, while Spire Alabama is the main distributor of natural gas in its service areas. Spire Missouri and Spire Alabama have franchises in nearly all the communities where they provide service with terms varying from five years to an indefinite duration. A franchise is essentially a municipal permit to install and maintain pipes and construct other facilities in the community. All of the franchises are free from unduly burdensome restrictions and are adequate for the conduct of Spire Missouri’s and Spire Alabama’s current public utility businesses in their respective states. In recent years, although certain franchise agreements have expired, the Utilities have continued to provide service in those communities without formal franchises.

The principal competition for the Utilities comes from the local electric companies. Other competitors in the service areas include suppliers of fuel oil, coal, and propane, as well as natural gas pipelines that can directly connect to large volume customers. Coal has historically been cost-competitive for large boiler plant loads, but environmental regulations and decarbonization objectives have shifted the economic advantage to natural gas. Oil and propane can be used to fuel boiler loads and certain direct-fired process applications, but these fuels require on-site storage, thus limiting their competitiveness. Competition also comes from district steam systems in the downtown areas of both St. Louis and Kansas City and from municipally or publicly owned natural gas distributors located adjacent to the Alabama service territories. Direct use of renewables is expected to continue to grow in the future and compete against distributed generation using natural gas.

Residential, commercial, and industrial customers represent approximately 92% and 81% of fiscal 2025 operating revenues for Spire Missouri and Spire Alabama, respectively. Given the current level of natural gas supply and market conditions, the Utilities believe that the relative comparison of natural gas equipment and operating costs with those of competitive fuels will not change significantly in the foreseeable future, and that these markets will continue to be supplied by natural gas. In new multi-family and commercial rental markets, the Utilities’ competitive exposures are presently limited to space and water heating applications.

Spire Missouri and Spire Alabama provide gas transportation service to large commercial and industrial customers. In fiscal 2025, transportation customers represented approximately 2% of operating revenues for Spire Missouri and 16% for Spire Alabama. The Spire Missouri tariff for this service produces a margin comparable to what Spire Missouri would earn under its regular sales rates. Similarly, Spire Alabama’s tariff is based on its sales profit margin, ensuring operating margins remain unaffected.

Natural Gas Supply

The Utilities’ fundamental gas supply strategy is to meet the two-fold objective of 1) ensuring a dependable gas supply is available for delivery when needed and 2) insofar as is compatible with that dependability, purchasing gas that is economically priced. In structuring their natural gas supply portfolio, the Utilities focus on natural gas assets that are strategically positioned to meet the Utilities’ primary objectives.

Spire Missouri focuses its gas supply portfolio on a number of large natural gas suppliers with equity ownership or control of assets strategically situated to complement its regionally diverse firm transportation arrangements. Spire Missouri utilizes Midcontinent, Gulf Coast, Northeast, and Rocky Mountain gas sources to provide a level of supply diversity that

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facilitates the optimization of pricing differentials as well as protecting against the potential of regional supply disruptions. Further, Spire STL Pipeline may deliver up to 400,000 million British thermal units (MMBtu) per day of natural gas into eastern Missouri, of which Spire Missouri is the foundation shipper with a contractual commitment of 350,000 MMBtu per day.

In fiscal 2025, Spire Missouri purchased natural gas from 39 different suppliers to meet its total service area current gas sales and storage injection requirements. Spire Missouri entered into firm agreements with suppliers including major producers and marketers providing flexibility to meet the temperature-sensitive needs of its customers. Natural gas purchased by Spire Missouri for delivery to its service areas included 36.5 Bcf through the Enable Mississippi River Transmission LLC (MRT) system, 27.6 billion cubic feet (Bcf) through the Southern Star Central Gas Pipeline, Inc. (Southern Star) system, 22.2 Bcf through the Panhandle Eastern Pipe Line Company, LP (PEPL) system, 17.9 Bcf through the Spire STL Pipeline, 7.8 Bcf through the Tallgrass Interstate Gas Transmission, LLC (TIGT) system, 7.7 Bcf through the Spire Mogas Pipeline, and 1.5 Bcf through the Rockies Express Pipeline, LLC (REX) system. Spire Missouri also holds firm transportation arrangements on several other interstate pipeline systems that provide access to gas supplies upstream. Some of Spire Missouri’s commercial and industrial customers purchased their own gas with Spire Missouri transporting 52.69 Bcf to them through its distribution system.

The fiscal 2025 peak day send out of natural gas to Spire Missouri East customers, including transportation customers, occurred on January 21, 2025. The average temperature was 9 degrees Fahrenheit in St. Louis, and on that day Spire Missouri East customers consumed 0.95 Bcf of natural gas. This peak day demand was met with natural gas transported to St. Louis through the MRT, Spire MoGas Pipeline LLC, Spire STL Pipeline, and Southern Star transportation systems, and from Spire Missouri’s on-system storage.

The fiscal 2025 peak day send out of natural gas to Spire Missouri West customers, including transportation customers, occurred on February 18, 2025. The average temperature was 7 degrees Fahrenheit in Kansas City, and on that day Spire Missouri West customers consumed 0.84 Bcf of natural gas. This peak day demand was met with natural gas transported to Kansas City through the Southern Star, PEPL, TIGT, and REX transportation systems.

Spire Alabama’s distribution system is connected to two major interstate natural gas pipeline systems, Southern Natural Gas Company, L.L.C. ("SNG") and Transcontinental Gas Pipe Line Company, LLC ("Transco"). It is also connected to two intrastate natural gas pipeline systems.

Spire Alabama purchases natural gas from various natural gas producers and marketers. Certain volumes are purchased under firm contractual commitments with other volumes purchased on a spot market basis. The purchased volumes are delivered to Spire Alabama’s system using a variety of firm transportation, interruptible transportation and storage capacity arrangements designed to meet the system’s varying levels of demand.

In fiscal 2025, Spire Alabama purchased natural gas from 20 different suppliers to meet current gas sales, storage injection, and liquefied natural gas (LNG) liquefaction requirements, of which one supplier is under a long-term supply agreement. Approximately 55.3 Bcf was purchased for delivery by SNG, 8.9 Bcf by Transco, and 16.2 Bcf through intrastate pipelines to the Spire Alabama delivery points for its residential, commercial, and industrial customers.

The fiscal 2025 peak day send out for Spire Alabama was 0.6 Bcf of natural gas on January 21, 2025, when the average temperature was 20 degrees Fahrenheit in Birmingham, of which 75% was met with supplies transported through SNG, Transco, and intrastate facilities. The remaining 25% was fulfilled with LNG.

Spire Gulf’s distribution system is directly connected to interstate pipelines, natural gas processing plants and gas storage facilities. Spire Gulf buys from a variety of producers and marketers, with BP Energy Company being the primary supplier.

Natural Gas Storage

Spire Missouri believes it currently has ample storage capacity to meet the demands of its distribution system, particularly to augment its supply during peak demand periods. Spire Missouri has a contractual right to store 22.0 Bcf of gas in MRT’s storage facility located in Unionville, Louisiana, 16.3 Bcf of gas storage in Southern Star’s system storage facilities located in Kansas and Oklahoma, and 1.4 Bcf of firm storage on PEPL’s system storage. MRT’s tariffs allow injections into storage from May 1 through November 1 and require the withdrawal from storage of all but 4.4 Bcf from November 1 through May 1. Southern Star tariffs allow both injections and withdrawals into storage year-round with ratchets that restrict the associated flows dependent upon the underlying inventory level per the contracts.

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In addition, Spire Missouri supplements pipeline gas with natural gas withdrawn from its own underground storage field located in St. Louis and St. Charles Counties in Missouri. The field is designed to provide approximately 0.35 Bcf of natural gas withdrawals on a peak day and provides the ability to reinject natural gas during the heating season to replenish or increase deliverability, subject to maximum annual net withdrawals of approximately 4.0 Bcf of natural gas based on the inventory level that Spire Missouri plans to maintain.

Spire Alabama has a contractual right to store 12.7 Bcf of gas with SNG, 0.5 Bcf of gas with Gulf South Pipeline, 0.2 Bcf of gas with Transco and 0.2 Bcf of gas with Tennessee Gas Pipeline. In addition, Spire Alabama has 2.0 Bcf of on-system LNG storage that can provide the system with up to an additional 0.2 Bcf of natural gas daily to meet peak day demand.

Spire Gulf obtains adequate storage capacity through Gulf South Pipeline Company, LP, and Enstor Gas, LLC’s Bay Gas Storage.

Regulatory and Environmental Matters

For details on regulatory matters, see Note 15, Regulatory Matters, of the Notes to Financial Statements in Item 8.

The Utilities are subject to various environmental laws and regulations that, to date, have not materially affected the Utilities’ or the Company’s financial position and results of operations. For a detailed discussion of environmental matters, see Note 16, Commitment and Contingencies, of the Notes to Financial Statements in Item 8.

GAS MARKETING

Spire Marketing is engaged in the marketing of natural gas and related services throughout the U.S., which includes customers inside and outside of the Utilities’ service areas. For fiscal 2025 and 2024, Spire Marketing volumes averaged 1.22 Bcf/day and 1.32 Bcf/day, respectively. The majority of Spire Marketing’s business is derived from the procurement and physical delivery of natural gas to a diverse customer base, primarily in the central and southern U.S. Through its retail operations, Spire Marketing offers natural gas marketing services to large commercial and industrial customers, while its wholesale business consists of producers, pipelines, power generators, municipalities, storage operators, and utility companies. Wholesale activities currently represent a majority of the total Gas Marketing business. The Gas Marketing strategy is to leverage its market expertise and risk management skills to manage and optimize the value of its portfolio of commodity, transportation, park and loan, and storage contracts while controlling costs and acting on new marketplace opportunities.

In the course of its business, Spire Marketing enters into agreements to purchase natural gas at a future date in order to lock up supply to cover future sales commitments to its customers. To secure access to the markets it serves, Spire Marketing contracts for transportation capacity on various pipelines from pipeline companies directly and from other parties through the secondary capacity market. Throughout fiscal 2025, Spire Marketing held approximately 1 Bcf per day of firm transportation capacity. In addition, to ensure reliability of service and to provide operational flexibility, Spire Marketing enters into firm storage contracts and interruptible park and loan transactions with various companies, where it is able to buy and retain gas to be delivered at a future date, at which time it sells the natural gas to third parties. As of September 30, 2025, Spire Marketing has contracted for approximately 18 Bcf of such storage and park and loan capacity for the 2025-2026 winter season.

Spire Marketing utilizes its natural gas supply agreements, transportation agreements, park and loan agreements, storage agreements and other executory contracts to support a variety of services to its customers at competitive prices. It closely monitors and manages the natural gas commodity price and volatility risks associated with providing such services to its customers through the use of a variety of risk management activities, including the use of exchange-traded/cleared derivative instruments and other contractual arrangements. Spire Marketing is committed to managing commodity price risk while it seeks to expand the services that it now provides. Nevertheless, income from the Gas Marketing operations is subject to more fluctuations in market conditions than the Utilities’ operations.

The Gas Marketing business is directly impacted by the effects of competition in the marketplace, the impacts of new infrastructure, surplus natural gas supplies, and the addition of new demand from exports, power generation and industrial load. Spire Marketing’s management expects a growing need for marketing services across the country as customers manage seasonal variability and marketplace volatility.

MIDSTREAM

Spire’s midstream operations consist of Spire Storage West, Spire Storage Salt Plains (jointly, ‘Spire Storage’), Spire STL Pipeline, and Spire MoGas Pipeline, all at least partially under the jurisdiction of the Federal Energy Regulatory Commission (FERC). On October 8, 2025, FERC approved the merger of Spire STL Pipeline into Spire MoGas Pipeline, consolidating operations under a single certificate and tariff while maintaining existing rates and service continuity.

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Spire Storage West, located in southwestern Wyoming, consists of two storage fields operating under one FERC market-based rate tariff currently certificated to provide up to approximately 55 Bcf of natural gas storage working gas capacity to customers primarily in the western region of the U.S. The actual working gas capacity was approximately 23 Bcf as of September 30, 2025.

Spire Storage Salt Plains is located in north central Oklahoma and serves markets in the midcontinent and midwestern U.S. Spire Storage Salt Plains is connected to Southern Star Pipeline and Oklahoma Gas Transmission. The facility operates under intrastate regulation with authorizations from FERC under Section 311 of the Natural Gas Policy Act to provide certain interstate storage, transportation, and hub services. Salt Plains is authorized to provide up to 17 Bcf of natural gas storage working gas capacity. The actual working gas capacity was approximately 11 Bcf as of September 30, 2025.

Spire STL Pipeline owns and operates a FERC-regulated 65-mile pipeline connecting the Rockies Express Pipeline in Scott County, Illinois, to delivery points in St. Charles County and St. Louis County, Missouri, including Spire MoGas Pipeline and Spire Missouri’s storage facility, and its operating revenue is derived primarily from Spire Missouri as its foundation shipper.

Spire MoGas Pipeline (or simply “MoGas”) consists of a 263-mile FERC-regulated natural gas pipeline and a wholly owned subsidiary - a connected 75-mile gas distribution system. The MoGas pipeline, connected to the Rockies Express Pipeline, Panhandle Eastern Pipeline, Mississippi River Transmission and Spire STL Pipeline, serves natural gas utilities/municipals in western St. Louis and south-central Missouri. The distribution system serves the U.S. Army’s Fort Leonard Wood near Rolla, Missouri.

In its Midstream segment, Spire seeks to drive growth through supporting natural gas grid reliability, the ability to manage exposure to gas price volatility, and providing access to key supply basins for the shipment of natural gas. These transportation and storage operations serve a variety of natural gas customers, including Spire’s other businesses.

Absolute natural gas prices do not directly impact the results of this segment, but there is a relationship between natural gas prices and the revenues derived from the transportation and storage of natural gas. Natural gas price trends and demand for natural gas influence these price relationships through market volatility or changes in absolute prices of one supply/market point to another. Further, natural gas price differences between the various hubs Spire serves could influence the volumes of gas transported or stored on Spire’s system and the related transportation and storage rates.

Item 1A. Risk Factors

Spire’s, Spire Missouri’s and Spire Alabama’s businesses and financial results are subject to a number of risks and uncertainties, including those set forth below. The risks described below are those management considers to be material. When considering any investment in these companies’ securities, investors should carefully consider the following information, as well as information contained in the caption “Forward-Looking Statements,” Item 7A, and other documents Spire, Spire Missouri, and Spire Alabama file with the SEC. This list is not exhaustive, and management places no priority or likelihood based on the risk descriptions, order of presentation or grouping.

RISKS AND UNCERTAINTIES THAT RELATE TO REGULATORY, LEGISLATIVE AND LITIGATION FACTORS

Regulatory and legislative developments in the energy industry related to climate change or in support of increased energy efficiency may adversely affect operations and financial results.

There have been a number of federal, state and local legislative and regulatory initiatives proposed in recent years in an attempt to control or limit the effects of global warming and overall climate change, including greenhouse gas emissions, such as methane and carbon dioxide. Adoption of this type of legislation by Congress or similar legislation by states or localities, or the adoption of related regulations by federal, state or local governments mandating a substantial reduction in greenhouse gas emissions, restricting the use of fossil fuels, such as natural gas, or restricting the construction of infrastructure could have far-reaching and significant impacts on the energy industry. Such new legislation or regulations could result in increased compliance costs or additional operating restrictions, adversely affect the demand for natural gas and/or midstream services, or impact the prices charged to customers, potentially reducing customer growth opportunities and/or increasing the cost of doing business.

In addition, legislative and regulatory initiatives by the federal, state and local governments addressing greenhouse gas emissions or restricting the use of natural gas could adversely affect customer demand. The promulgation of regulations of the emissions of greenhouse gases and efficiency for residential gas furnaces and other gas appliances or the potential enactment of congressional legislation addressing global warming and climate change may decrease customer usage, encourage fuel switching from gas to other energy forms, and may result in future additional compliance costs that could

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impact the Utilities’ financial conditions and results of operations. At this time, we cannot predict the potential impact of such laws or regulations that may be adopted on the Company’s and the Utilities’ future business, financial condition or financial results.

In March 2024, the SEC adopted the final climate disclosure rules to enhance and standardize climate-related disclosures by public companies. These rules were immediately challenged in court and were voluntarily stayed by the SEC in April 2024. In March 2025, the SEC voted to end its defense of the rules, and in September 2025, the Eighth Circuit issued an order holding the case abeyance until the SEC decides to rescind, repeal, revise, or defend the rules. Accordingly, the rules remain stayed. If the rules, or similar rules, become effective in the future, compliance could require significant additional expenditures.

Regulation of the Utilities’ businesses may impact rates they are able to charge, costs, and profitability.

The Utilities are subject to regulation by federal, state and local authorities. At the state level, the Utilities are regulated in Missouri by the MoPSC, in Alabama by the APSC, and in Mississippi by the MSPSC. These state public service commissions regulate many aspects of the Utilities’ distribution operations, including construction and maintenance of facilities, operations, safety, the rates the Utilities may charge customers, the terms of service to their customers, transactions with their affiliates, the rate of return they are allowed to realize, and the accounting treatment for certain aspects of their operations. For further discussion of these accounting matters, see Regulatory Accounting under Critical Accounting Estimates in Item 7.

Accounting for the economics of rate regulation affects multiple financial statement line items (such as property, plant, and equipment; regulatory assets and liabilities; operating revenues; and operating expenses) and affects multiple disclosures in the Company’s financial statements. There is a risk that the state public service commissions will not approve full recovery of the costs of providing utility service or recovery of all amounts invested in the utility business and a reasonable return on that investment. A material disallowance of deferred costs could adversely affect the Utilities’ results of operations.

The MoPSC also approves Spire Missouri’s Infrastructure System Replacement Surcharge ("ISRS"). The ISRS allows Spire Missouri expedited recovery for its investment to upgrade its infrastructure and enhance its safety and reliability without the necessity of a formal rate case. Such investments are subject to review, and there is risk that any material disallowance of costs under ISRS could adversely affect the timing of revenues and cash flows. Without legislative action, the ISRS statute related to gas utilities will expire on August 28, 2029.

The Utilities’ ability to obtain and timely implement rate increases and rate supplements to maintain the current rate of return is subject to regulatory review and approval. There can be no assurance that they will be able to obtain rate increases or rate supplements or continue earning the current authorized rates of return. The Rate Stabilization and Equalization (RSE) mechanism, which requires Spire Alabama and Spire Gulf to file an annual rate review based on the utility’s budget for the upcoming fiscal year, was last renewed in 2022, and absent a Commission order modifying Spire Alabama’s tariff, the existing RSE terms shall continue in effect beyond September 30, 2025. Spire Mississippi is subject to regulation by the MSPSC and utilizes the Rate Stabilization Adjustment ("RSA") Rider. For further details, see Note 15, Regulatory Matters, of the Notes to Financial Statements in Item 8.

The Utilities could incur additional costs if required to adjust to new laws or regulations, revisions to existing laws or regulations or changes in interpretations of existing laws or regulations. In addition, as the regulatory environment for the natural gas industry increases in complexity, the risk of inadvertent noncompliance could also increase. If the Utilities fail to comply with applicable laws and regulations, whether existing or new, they could be subject to fines, penalties, business interruption or other enforcement action by the authorities that regulate the Utilities’ operations.

Federal safety and integrity regulations related to pipeline and storage operators and owners of critical infrastructure may impose significant costs and liabilities on the Company.

The U.S. Pipeline and Hazardous Materials Safety Administration ("PHMSA") requires pipeline and natural gas storage operators to develop integrity management programs to evaluate their pipelines comprehensively and to take additional measures to protect pipeline segments located in areas where a leak or rupture could potentially do the most harm. The Company is required to maintain programs that are intended to assess pipeline integrity. Any repair, remediation, preventative or mitigating actions may require significant capital and operating expenditures. PHMSA constantly updates its regulations to ensure the highest levels of pipeline safety. As the operator of pipelines, Spire is required to:

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perform ongoing assessments of pipeline integrity;

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identify and characterize applicable threats to pipelines;

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improve data collection, integration and analysis;

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repair and remediate the pipeline as necessary; and

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implement preventative and mitigating actions.

The PHMSA advisory bulletin to the Protecting Our Infrastructure of Pipelines and Enhancing Safety (PIPES) Act of 2020 was rescinded June 13, 2025. This would have, among other things, required the evaluation of steps taken to prevent and mitigate unintentional and intentional emissions from natural gas releases, e.g. increased the frequency of leak detection surveys, promoted advanced leak detection programs, and required accelerated repair of leaks found. Additionally, it would have required operators to have written O&M plans to address not only public safety, but also the protection of the environment. At this time, it is indeterminable if or when such regulation might go into effect. Nonetheless, the company will continue to implement Advanced Mobile Leak Detection in its service territories over the next three years.

The Transportation Security Administration ("TSA") requires owners and operators of specified pipeline facilities to take action to prevent disruption and degradation to their infrastructure to achieve the following security outcomes:

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develop network segmentation policies and controls;

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create access control measures to secure and prevent unauthorized access to critical cyber systems;

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build continuous monitoring and detection policies and procedures to detect threats and correct anomalies; and

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reduce the risk of exploitation of unpatched systems in a timely manner using a risk-based methodology.

As such, pipeline owners and operators are required to establish and execute a TSA-approved Cybersecurity Implementation Plan, develop and maintain a Cybersecurity Incident Response Plan, and establish a Cybersecurity Assessment Program. To date, Spire is compliant with these requirements.

Costs to comply with these and other such future safety and integrity regulations are significant. Additionally, should the Company fail to comply with applicable statutes, rules, regulations and orders, it could be subject to significant fines, penalties, business interruption or other enforcement actions.

Environmental laws and regulations may require significant expenditures or increase operating costs.

The Utilities and Midstream companies are subject to federal, state and local environmental laws and regulations affecting many aspects of their present and future operations. These laws and regulations require these businesses to obtain and comply with a wide variety of environmental licenses, permits, inspections, and approvals. Failure to comply with these laws and regulations and failure to obtain any required permits and licenses may result in costs in the form of fines, penalties, business interruptions or other enforcement actions, which may be material. In addition, existing environmental laws and regulations could be revised or reinterpreted and/or new laws and regulations could be adopted or become applicable to these companies or their facilities, thereby impacting the cost of compliance. With the overturning of the 40-year-old “Chevron Doctrine” on June 28, 2024, which had provided for deference to agencies’ interpretation of regulations in litigation against those agencies, there is additional uncertainty going forward regarding current and future regulatory interpretations. The discovery of presently unknown environmental conditions, including former manufactured gas plant sites, and adverse claims under environmental laws and regulations may result in expenditures and liabilities, which could be material. To the extent environmental compliance costs are self-insured, or not fully covered by insurance or recovered in rates from customers, those costs may have an adverse effect on financial condition and results of operations.

The Utilities’ liquidity may be adversely affected by delays in recovery of their costs, due to regulation.

In the normal course of business, there is a lag between when the Utilities incur increases in certain of their costs and the time in which those costs are considered for recovery in the ratemaking process. Cash requirements for increased gas supply costs, operating costs, increased funding levels of defined benefit pension and postretirement costs, capital expenditures, interest expense and other increases in the costs of doing business, including inflation, can require outlays of cash prior to the authorization of increases in rates charged to customers, as approved by the MoPSC, APSC, or MSPSC. Accordingly, the Utilities’ liquidity can be adversely impacted to the extent higher costs are not timely recovered from their customers.

Changes to income tax policy, certain tax elections, tax regulations and future taxable income could adversely impact the Company’s financial condition and results of operations.

The Company has significantly reduced its current federal and state income tax obligations over the past few years through tax planning strategies and application of tax rules, including the use of bonus depreciation deductions for certain property expenditures. As a result, the Company generated large annual taxable losses that have resulted in significant federal and state net operating losses ("NOLs"). The Company plans to utilize these NOLs in the future. The value of these NOLs could be reduced if the Company cannot generate sufficient taxable income to utilize all of the NOLs before they expire, or if changes in income tax policy, lower-than-expected financial performance, or regulatory actions occur.

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On July 4, 2025, U.S. tax legislation known as the One Big Beautiful Bill Act ("OBBBA") was enacted, which made permanent many provisions of the Tax Cuts and Jobs Act of 2017 and introduced additional changes to U.S. corporate tax rules, some of which become effective in 2026. While OBBBA is not expected to have a material impact to our financial condition or results of operations, future legislative changes, including potential modifications to OBBBA or other tax reforms, could adversely impact the Company. These impacts could include reducing the value of its NOLs and could result in material charges to earnings. Further, the Company’s financial condition and results of operations may be adversely impacted.

The Company may be involved in legal or administrative proceedings before various courts and governmental bodies that could adversely affect its results of operations and financial condition.

The Company may be involved in legal or administrative proceedings before various courts and governmental bodies with respect to general claims, rates, environmental issues, gas cost prudence reviews and other matters. For further details, see Contingencies in Note 16 to the financial statements in Item 8. Adverse decisions regarding these matters, to the extent they require the Company to make payments in excess of amounts provided for in its financial statements, or to the extent they are self-insured or not covered by insurance, could adversely affect the results of operations and financial condition.

Commodity markets and derivative instruments are regulated by federal agencies, and new developments in this area may adversely impact Spire Marketing’s results of operations andfinancial condition.

As a participant in the natural gas market, Spire Marketing is subject to applicable statutes, rules, regulations and orders administered by FERC and the Commodity Futures Trading Commission ("CFTC"), including those directed generally to prevent fraud or manipulation involving natural gas transactions (physical or financial transactions). Spire Marketing could be subject to fines, penalties, business interruption or other enforcement actions by the FERC or CFTC, or both, for failure to comply with such rules. New regulatory and legislative actions may adversely impact Spire Marketing’s results of operations and financial condition by potentially reducing customer growth opportunities and/or increasing the costs of doing business.

Spire Marketing uses bilateral contracts and derivative instruments such as futures contracts, options and swaps to hedge or mitigate ongoing commercial risks. Most standardized swaps, under the Dodd-Frank Act and regulations from the CFTC, are required to be cleared through a registered clearing facility and traded on a designated exchange or swap execution facility, subject to certain exceptions. These regulations may also require compliance with certain margin requirements for over-the-counter derivative contracts with certain regulated entities, which could adversely affect liquidity and ability to use derivatives to hedge risks. In addition, the CFTC’s rules require companies, including Spire Marketing, to maintain regulatory records of swap transactions, and to report swaps to centralized swap data repositories, among other compliance obligations.

Although Spire Marketing may qualify for exceptions to certain of these CFTC rules, its derivatives counterparties are likely subject to capital, margin, documentation and business conduct requirements imposed as a result of the Dodd-Frank Act. These obligations may increase transaction costs and may make it more difficult for Spire Marketing to enter into hedging transactions on favorable terms or affect the number and/or creditworthiness of available swap counterparties. In that event, Spire Marketing’s inability to enter into derivatives instruments or other commercial risk hedging transactions on favorable terms, or at all, could increase operating expenses and expose it to unhedged commercial risks, including potential adverse changes in commodity prices.

RISKS THAT RELATE TO OPERATIONAL FACTORS

The Company’s ability to meet its customers’ natural gas requirements may be impaired if contracted gas supplies, interstate pipeline and/or storage services are not available or delivered in a timely manner.

In order to meet their customers’ annual and seasonal natural gas demands, the Utilities must obtain sufficient supplies, interstate pipeline capacity, and storage capacity. If they are unable to obtain these, either from their suppliers’ inability to deliver the contracted commodity or the inability to secure replacement quantities, to the extent not mitigated by tariffs, contractual indemnification or insurance, the Utilities’ financial condition and results of operations may be adversely impacted. If a substantial disruption in interstate natural gas pipelines’ transmission and storage capacity were to occur during periods of heavy demand, the Utilities’ financial results could be adversely impacted.

Spire Marketing’s ability to deliver natural gas to its customers is contingent upon the performance of its suppliers and capability of pipeline and storage operators to fulfill delivery obligations to Spire Marketing under firm contracts. To the extent that it is unable to obtain the necessary supplies, Spire Marketing’s financial position and results of operations may be adversely impacted.

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Midstream is dependent upon third-party pipelines and other facilities to provide delivery options to and from its facilities. If any pipeline connection were to become unavailable for volumes of natural gas due to repairs, damage to the facility, lack of capacity or any other reason, the ability to continue receiving or delivering natural gas could be restricted, and to the extent not mitigated by contractual indemnification, insurance or tariffs, would thereby reduce its revenues. Any permanent interruption that causes a material reduction in volumes could result in an impairment loss that could have a material adverse effect on the financial condition and results of operations.

Transporting, distributing, and storing natural gas and propane involves numerous risks that may result in accidents and other operational issues.

Natural gas transportation, distribution and storage activities inherently involve a variety of integrity issues, hazards and operations risks, such as leaks, accidental explosions, blowouts, damage caused by third parties, activities of contractors, and mechanical problems, which could cause substantial financial losses. In addition, these risks could result in serious injury to employees and non-employees, loss of human life, significant damage to property, environmental pollution, impairment of operations, and substantial losses to the Company and its subsidiaries. The location of pipelines and storage facilities near populated areas, including residential areas, commercial business centers, and industrial sites, could increase the level of damages resulting from these risks. Similar risks also exist for Spire Missouri’s propane storage, transmission and minor distribution operations. These activities may subject the Company to litigation or administrative proceedings. Such litigation or proceedings could result in substantial monetary judgments, fines, penalties, business interruption or other enforcement actions against the Company and its subsidiaries or be resolved on unfavorable terms. In accordance with customary industry practices, the Utilities and other Spire businesses maintain insurance against a significant portion, but not all, of these risks and losses. To the extent the occurrence of any of these events is self-insured or not fully covered by insurance, it could adversely affect the financial condition and results of operations of the Company and its subsidiaries.

Because of competition, the Company may not be able to retain existing customers or acquire new customers, or may be unsuccessful in retaining or acquiring contractual assets on favorable terms, which could have an adverse impact on its business, results of operationsand financial condition.

The Utilities face the risk that larger commercial or industrial customers may bypass gas distribution services by directly connecting with interstate pipelines or, in the case of Spire Alabama and Spire Gulf, also from municipally or publicly owned gas distributors located adjacent to its service territory. The Utilities cannot provide any assurance that increased competition will not have a material adverse effect on their business, financial condition or results of operations.

The Utilities compete with distributors offering a broad range of services and prices, from full-service distributors to those offering delivery only. The Utilities also compete for retail customers with suppliers of alternative energy products, principally propane and electricity, and to a growing extent, distributed sources of renewable energy. If they are unable to compete effectively, the Utilities may lose existing customers and/or fail to acquire new customers, which in the aggregate could have a material adverse effect on their business, results of operations and financial condition. Along those lines, changes in wholesale natural gas prices compared with prices for electricity, fuel oil, coal, propane, or other energy sources can significantly impact the cost of delivered natural gas, which may affect the Utilities’ retention of natural gas customers and may adversely impact their financial condition and results of operations.

Spire Storage is subject to competition from similar services provided by pipelines and from competing independent storage providers capable of serving its customers. Natural gas storage is a competitive business, with competitors having the ability to expand storage capacity. Increased competition in the natural gas storage business could reduce the demand and drive rates down for the Company’s natural gas storage services. To a lesser extent, competition and the price differences between natural gas hubs can also impact the volumes and rates of our interstate pipelines.

Also, Spire Marketing profitability may be impacted by the effects of the expiration, in the normal course of business, of certain of its natural gas supply, sales, transportation and storage contracts if, because of competition or other reasons, those contracts cannot be replaced and/or renewed with arrangements with similar terms and pricing.

Significantly warmer-than-normal weather conditions and the effects of climate change may affect the Utilities’ sale of heating energy and adversely impact their financial position and results of operations.

The Utilities’ earnings are primarily generated by the sale of heating energy. Spire Missouri and Spire Mississippi each have a Weather Normalization Adjustment rider, Spire Alabama has a Temperature Adjustment Rider, and Spire Gulf has a Weather Impact Normalization Factor. These mechanisms, approved by the respective state regulatory body, provide better assurance of the recovery of fixed costs and margins during winter months despite variations in sales volumes due to the impacts of weather, while the annual rate designs of Alabama and Mississippi help adjust for other factors that affect customer usage. However, significantly warmer-than-normal weather conditions in the Utilities’ service areas and

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other factors, such as climate change, alternative energy sources and increased efficiency of gas furnaces and other appliances, may result in reduced profitability and decreased cash flows attributable to lower gas sales. Furthermore, these mechanisms do not fully mitigate the impact of warmer weather and continuation of these adjustment factors is subject to regulatory discretion.

To the extent climate change results in warmer temperatures, financial results could be adversely affected through lower gas volumes and revenues and reduced marketing opportunities. Management believes it is likely that any such resulting impacts would occur over a long period of time and thus would be difficult to quantify with any degree of specificity. Another possible impact of climate change may be more frequent and more severe weather events, such as significant wind or flooding events, which could increase costs to repair damaged facilities and restore service to customers or result in lost revenues if the Company were unable to deliver natural gas to customers. Such weather events could also disrupt our usual gas supplies and make it impossible or extremely costly to find replacement gas for our customers. To the extent such impacts are self-insured, or not covered by insurance or recovered in rates, the foregoing events could have a material adverse effect on the Company’s financial condition and results of operations.

The Company’s natural gas storage business includes inherent geologic and operational risks.

Any damage to the Spire Storage facilities or pipelines, or lack of integrity to its storage fields, including damages caused by a blow-out, to the extent such impacts are self-insured or not covered by insurance, could have a material adverse effect on the Company’s financial condition and results of operations.

The Company does not own all the land on which its storage facilities were constructed, and it is, therefore, subject to the possibility of more onerous terms or increased costs to retain necessary land use, if and when applicable property rights expire or are renewed. Changes in the terms of such land use could have an adverse impact on the financial condition and results of operations of the Company’s storage business.

Increased dependence on technology may hinder the Company’s business operations and adversely affect their financial condition and results of operations if such technologies fail.

The Company has implemented or acquired a variety of technological tools including both Company-owned information technology and technological services provided by outside parties. These tools and systems support critical functions including the Company’s integrated planning, scheduling and dispatching of field resources, its automated meter reading system, customer care and billing, procurement and accounts payable, operational plant logistics, management reporting, and external financial reporting. The failure of these or other similarly important technologies, or the Company’s inability to have these technologies supported, updated, expanded, or integrated into other technologies, could hinder its business operations and, to the extent such impacts are self-insured or not covered by insurance, could adversely impact its financial condition and results of operations.

Although the Company has, when possible, developed alternative sources of technology and built redundancy into its computer networks and tools, there can be no assurance these efforts to date would protect against all potential issues related to the loss of any such technologies or the Company’s use of such technologies. While the Company assesses the cyber protection of its vendors, the Company’s use of an outside party presents cyber exposure that must also be carefully managed.

A cyberattack may disrupt the Company’s operations or lead to a loss or misuse of confidential and proprietary information or potential liability.

The Company is subject to cybersecurity risks primarily related to breaches of security pertaining to sensitive customer, employee, and vendor information maintained by the Company, its subsidiaries, or its third-party vendors in the normal course of business, as well as breaches in the technology that manages natural gas supply and control operations and other business processes. A loss of confidential or proprietary data or security breaches of technology for operations or business processes could adversely affect the Company’s reputation, diminish customer confidence, disrupt operations, and subject the Company to possible financial liability, any of which could have a material effect on its financial condition and results of operations. Despite Company policy restrictions on artificial intelligence ("AI"), whitelisting of sites, and contractual limitations on vendors’ use of AI, there is also a risk of inadvertent sharing of confidential or proprietary data through the inappropriate use of open AI tools.

The Company acknowledges increased dependence on technology increases its exposure to cyberattack. The Company closely monitors both preventive and detective measures to manage these risks and maintain cyber risk insurance to mitigate a significant portion, but not all, of these risks and losses. To the extent that the occurrence of any of these cyber events is self-insured or not covered by insurance, it could adversely affect the Company’s financial condition and results of operations. In the event of a material cyber event, the Company is required to inform investors and to publicly disclose the nature of such an event to comply with SEC rules and regulations.

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The Company’s business activities are concentrated in a few states and regions.

The Utilities provide natural gas distribution services to customers in Alabama, Mississippi, and Missouri. On July 27, 2025 the Company entered into an agreement to purchase the Tennessee natural gas local distribution company business of Piedmont Natural Gas Company, Inc. ("Piedmont Natural Gas") from Duke Energy Corporation ("Duke Energy"). Midstream is focused on the Rocky Mountain/Western and Midcontinent regions. Changes in the regional economies, politics, regulations and weather patterns of these states could negatively impact growth opportunities and the usage patterns and financial condition of customers and could adversely affect earnings, cash flows, and financial position.

RISKS THAT RELATE TO FINANCIAL, ECONOMIC AND MARKET FACTORS

As a holding company, Spire depends on its operating subsidiaries to meet its financial obligations.

Spire is a holding company with no significant assets other than the stock of its operating subsidiaries and cash investments. Spire, and Spire Missouri prior to the holding company’s formation in 2000, has paid common stock dividends continuously since 1946. Spire’s ability to pay dividends to its shareholders is dependent on the ability of its subsidiaries to generate sufficient net income and cash flows to pay upstream dividends and make loans or loan repayments.

A downgrade in Spire’s and/or its subsidiaries’ credit ratings and/or reduced access to credit and capital markets may negatively affect its cost of capital or prevent it from executing operating strategies.

Currently, Spire, Spire Missouri, and Spire Alabama have investment-grade credit ratings. There is no assurance such credit ratings for any of these companies will remain in effect for any given period or such ratings will not be lowered, suspended or withdrawn entirely by the rating agencies, if, in each rating agency’s judgment, circumstances so warrant. Spire has a working capital line of credit to meet its short-term liquidity needs. Spire’s line of credit may be used to meet the liquidity needs of any of its subsidiaries, subject to sublimits. If the rating agencies lowered the credit rating at any of these entities, particularly below investment grade, it might significantly limit that entity’s ability to secure new or additional credit facilities and would increase its costs of borrowing. Spire’s and the Utilities’ ability to borrow under current or new credit facilities and costs of that borrowing have a direct impact on their ability to execute their operating strategies.

Spire Marketing relies on its cash flows, ability to effect net settlements with counterparties, parental guaranties, and access to Spire’s liquidity resources to satisfy its credit and working capital requirements. Spire Marketing’s ability to rely on parental guaranties is dependent upon Spire’s financial condition and credit ratings. If Spire’s credit ratings were lowered, particularly below investment grade, counterparty acceptance of parental guaranties may diminish, resulting in decreased availability of credit. Additionally, under such circumstances, certain counterparties may require Spire Marketing to provide prepayments or cash deposits, amounts of which would be dependent upon natural gas market conditions. Reduced access to credit or increased credit requirements, which may also be caused by factors such as higher overall natural gas prices, may limit Spire Marketing’s ability to enter into certain transactions. In addition, Spire Marketing has concentrations of counterparty credit risk in that a significant portion of its transactions are with (or are associated with) utility companies and their marketing affiliates. The concentration of counterparties has the potential to affect the Company’s overall exposure to credit risk, either positively or negatively, in that customers in this group may be affected similarly by changes in economic, industry, or other conditions. Spire Marketing also has concentrations of credit risk in certain individually significant counterparties. Spire Marketing closely monitors its credit exposure and, although uncollectible amounts have not been significant, increased counterparty defaults are possible and may result in financial losses and/or capital limitations.

Regional supply/demand imbalances, fluctuations in natural gas commodity prices, changes in the terms and rates charged by midstream facilities, and infrastructure projects may adversely impact the future profitability of the Company.

Competition in the marketplace and fluctuations in natural gas commodity prices have a direct impact on Spire Marketing. Changing market conditions and prices, the narrowing of regional and seasonal price differentials and limited future price volatility may adversely impact its sales margins or affect its ability to procure gas supplies and/or to serve certain customers, which may reduce sales profitability and/or increase certain credit requirements caused by reductions in netting capability. Although the FERC regulates the interstate transportation of natural gas and establishes the general terms and conditions under which Spire Marketing may use interstate gas pipeline capacity to purchase and transport natural gas, Spire Marketing must occasionally renegotiate its transportation agreements with a concentrated group of pipeline companies. Renegotiated terms of new agreements or increases in FERC-authorized rates of existing agreements may impact Spire Marketing’s future profitability. Profitability may also be adversely impacted if pipeline capacity or future storage capacity secured is not fully utilized.

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Storage businesses are affected by various gas market fundamentals which impact the level of demand for storage services and the rates that can be charged for these services. These market fundamentals include: seasonal price spread; monthly, daily and hourly price volatility; locational basis for pricing points on pipelines connected to a storage facility; seasonal, daily and hourly weather; and operational impacts in supply and market areas served by a storage facility and its connected pipelines. These fundamentals have varying and potentially material adverse impacts on the various services offered by storage facilities and the rates that can be charged for these services in the market. These services include long-term firm storage, short-term park and loan, wheeling, and optimization. Rates below the variable costs to operate a storage facility could result in a decision to not operate all the capacity in the facility or to operate the facility at a loss if required to fulfill firm customer contract obligations. A sustained decline in these rates or a shut-in of all or a portion of one or more facilities’ capacity could have an adverse impact on the Company’s financial condition and results of operations.

Spire Missouri’s and Spire Alabama’s income from off-system sales and capacity release is subject to fluctuations in market conditions and changing supply and demand conditions in areas the Utilities hold pipeline capacity rights. Specific factors impacting the Utilities’ income from off-system sales and capacity release include the availability of attractively priced natural gas supply, availability of pipeline capacity, and market demand. Income from off-system sales and capacity release is shared with customers. Spire Missouri and Spire Alabama are allowed to retain 25% of the net margins achieved as a result of such off-system sales and capacity release. The Utilities’ ability to retain such income in the future is also subject to regulatory discretion.

Rapid significant increases in natural gas prices may adversely affect the Utilities’ liquidity and, in certain circumstances, results of operations.

The tariff rate schedules of Spire Missouri, Spire Gulf and Spire Mississippi contain PGA clauses and Spire Alabama’s tariff rate schedule contains a GSA rider that permit the Utilities to file for rate adjustments to recover the cost of purchased gas. Changes in the cost of purchased gas are flowed through to customers and may affect uncollectible amounts and cash flows and can therefore impact the amount of capital resources.

Currently, Spire Missouri is allowed to adjust the gas cost component of rates up to four times each year while Spire Alabama and Spire Gulf (collectively, the “Alabama Utilities”) and Spire Mississippi may adjust the gas cost component of their rates on a monthly basis. Spire Missouri must make a mandatory gas cost adjustment at the beginning of the winter, in November, and during the next twelve months may make up to three additional discretionary gas cost adjustments, so long as each of these adjustments is separated by at least two months.

The MoPSC typically approves the Spire Missouri PGA changes on an interim basis, subject to refund and the outcome of a subsequent audit and prudence review. Due to such review process, there is a risk of a disallowance of full recovery of these costs. Any material disallowance of purchased gas costs would adversely affect results of operations. The Alabama Utilities’ gas supply charges are submitted for APSC review monthly, regardless of whether there is a request for a change, so prudence review occurs on an ongoing basis. Spire Mississippi’s PGA is adjusted monthly for the most recent charges and is filed at the MSPSC monthly.

Increases in the prices the Utilities charge for gas may also adversely affect revenues because they could lead customers to reduce usage and cause some customers to have trouble paying the resulting higher bills. These higher prices may increase bad debt expenses and ultimately reduce earnings. Rapid increases in the price of purchased gas may result in an increase in short-term debt.

To lower financial exposure to commodity price fluctuations, Spire Missouri enters into contracts to hedge the forward commodity price of its natural gas supplies. As part of this strategy, Spire Missouri may use fixed-price forward physical purchase contracts, swaps, futures, and option contracts. However, Spire Missouri does not hedge the entire exposure of energy assets or positions to market price volatility, and the coverage will vary over time. Any costs, gains, or losses experienced through hedging procedures, including carrying costs, generally flow through the PGA clause, thereby limiting Spire Missouri’s exposure to earnings volatility. However, variations in the timing of collections of such gas costs under the PGA clause and the effect of cash payments for margin deposits associated with Spire Missouri’s use of natural gas derivative instruments may cause short-term cash requirements to vary. These procedures remain subject to prudence review by the MoPSC.

Other than fixed-price forward physical purchase contracts, Spire Alabama, Spire Gulf, and Spire Mississippi currently do not utilize risk mitigation strategies that incorporate commodity hedge instruments, but Spire Alabama has the ability to do so through its GSA.

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Risk management policies, including the use of derivative instruments, may not fully protect Spire Marketing’s sales and results of operations from volatility and may result in financial losses.

In the course of its business, Spire Marketing enters into contracts to purchase and sell natural gas at fixed prices and index-based prices. Commodity price risk associated with these contracts has the potential to impact earnings and cash flows. To minimize this risk, Spire Marketing has a risk management policy that provides for daily monitoring of a number of business measures, including fixed price commitments.

Spire Marketing currently manages the commodity price risk associated with fixed-price commitments for the purchase or sale of natural gas by either closely matching the offsetting physical purchase or sale of natural gas at fixed prices or through the use of natural gas futures, options, and swap contracts traded on or cleared through the New York Mercantile Exchange, Inc. and/or the Intercontinental Exchange to lock in margins. These exchange-traded/cleared contracts may be designated as cash flow hedges of forecasted transactions. However, market conditions and regional price changes may cause ineffective portions of matched positions to result in financial losses. Additionally, to the extent that Spire Marketing’s natural gas contracts are classified as trading activities or do not otherwise qualify for the normal purchases or normal sales designation (or the designation is not elected), the contracts are recorded as derivatives at fair value each period. Accordingly, the associated gains and losses are reported directly in earnings and may cause volatility in results of operations. Gains or losses (realized and unrealized) on certain wholesale purchase and sale contracts, consisting of those classified as trading activities, are required to be presented on a net basis (instead of a gross basis) in the statements of consolidated income. Such presentation could result in volatility in the Company’s operating revenues.

Spire’s pension and other postretirement benefit plans are subject to investment and interest rate risk that could negatively impact its financial condition.

Spire and its subsidiaries have pensions and other postretirement benefit plans that provide benefits to many of their employees and retirees. Costs of providing benefits and related funding requirements of these plans are subject to changes in the market value of the assets that fund the plans. The funded status of the plans and the related costs reflected in the Company’s financial statements are affected by various factors, which are subject to an inherent degree of uncertainty, including economic conditions, financial market performance, interest rates, life expectancies and demographics. Recessions and volatility in the domestic and international financial markets have negatively affected the asset values of the Company’s pension plans at various times in the past. Poor investment returns or lower interest rates may necessitate accelerated funding of the plans to meet minimum federal government requirements, which could have an adverse impact on the Company’s financial condition and results of operations. For more information, including regulatory provisions affecting the Utilities’ plans, see Note 13, Pension Plans and Other Postretirement Benefits, of the Notes to Financial Statements in Item 8.

In connection with acquisitions, Spire and Spire Missouri recorded goodwill and long-lived assets that could become impaired and adversely affect its financial condition and results of operations.

Spire and Spire Missouri assess goodwill for impairment annually or more frequently if events or circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. The Company and Spire Missouri assess their long-lived assets for impairment whenever events or circumstances indicate an asset’s carrying amount may not be recoverable. To the extent the value of goodwill or long-lived assets becomes impaired, the Company and Spire Missouri may be required to incur impairment charges that could have a material impact on their results of operations.

Since interest rates are a key component, among other assumptions, in the models used to estimate the fair values of the Company’s reporting units, rises in interest rates would generally decrease the calculated fair values and future impairments may occur. Due to the subjectivity of the assumptions and estimates underlying the impairment analysis, Spire and Spire Missouri cannot provide assurance that future analyses will not result in impairment. These assumptions and estimates include projected cash flows, current and future rates for contracted capacity, growth rates, weighted average cost of capital and market multiples.

GENERAL RISK FACTORS

Resources expended to pursue or integrate business acquisitions, investments, or other business arrangements may adversely affect Spire’s financial position and results of operations, and the return on such investments may not meet the Company’s expectations.

From time to time, Spire may seek to grow through strategic acquisitions, investments, or other business arrangements. Attractive opportunities may be difficult to complete on economically acceptable terms. Spire may expend considerable resources pursuing acquisitions or investments that, for various reasons, do not move forward. Similarly, investment opportunities may be hindered or halted by regulatory or legal actions. When acquisitions or investments are completed,

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these transactions involve a number of risks, including, but not limited to, the assumption of material liabilities, the diversion of management’s attention from daily operations, difficulties in assimilating and retaining employees, challenges in integrating information technology systems, securing adequate capital to support the transaction, the potential impact on credit ratings, and obtaining necessary regulatory approvals. Uncertainties also exist in assessing the value, risks, profitability, and liabilities associated with certain businesses or assets. There is a possibility that anticipated operating and financial efficiencies expected from an acquisition or investment may not materialize. Additionally, there are no assurances that resources expended will achieve their intended results. Failure to successfully complete or integrate an acquisition or investment could adversely affect Spire’s financial condition, results of operations, and the market’s perception of the Company’s ability to execute its strategy. Subsidiaries, including the Utilities, may face similar risks when engaging in these activities.

On July 27, 2025, the Company entered into an agreement to acquire Piedmont Natural Gas local distribution company business in Tennessee from Duke Energy for approximately $2.48 billion, subject to regulatory approvals and customary closing conditions. This transaction involves risks, including the possibility that required approvals may not be obtained or may be delayed, that the transaction may not close on the anticipated timeline or at all, that integration may be more difficult or costly than expected, and that anticipated benefits may not be realized. We may also assume unexpected liabilities and incur significant transaction costs, and the transaction could divert management attention or disrupt ongoing operations.

Unexpected losses may adversely affect Spire’s or its subsidiaries’ financial condition and results of operations.

As with most businesses, there are operations and business risks inherent in the activities of Spire’s subsidiaries or even the activities of its vendors. If, in the normal course of business, Spire or any of its subsidiaries becomes a party to litigation, such litigation could result in substantial monetary judgments, fines, penalties, business interruption or other enforcement actions or be resolved on unfavorable terms. In accordance with customary practice, Spire and its subsidiaries secure strong contractual indemnification requirements where available and maintain insurance against a significant portion of, but not all, risks and losses, though it does reinsure a portion of the risk from certain of Spire’s insurers through its captive insurance company. Spire and its operating companies employ many strategies to gain assurance such risks are appropriately managed, mitigated, or insured, as appropriate. To the extent a loss is self-insured or not fully covered by insurance or other risk mitigation strategies, that loss could adversely affect Spire’s and/or its subsidiaries’ financial condition and results of operations.

Catastrophic events may adversely affect the Company’s facilities and operations.

Catastrophic events such as fires, earthquakes, explosions, floods, tornadoes, hurricanes, tropical storms, winter storms, terrorist acts, acts of civil unrest, pandemic illnesses or other similar occurrences could adversely affect the Utilities’ facilities and operations, as well as those of Midstream. Emergency planning and training programs are in place to respond to events that could cause business interruptions; however, unanticipated events or a combination of events, failure in resources needed to respond to events, or slow or inadequate response to events may have an adverse impact. To the extent the impacts of such catastrophic events are not covered by insurance or recovered in rates, this could have a material adverse effect on the Company's financial condition and results of operations.

Workforce risks may affect the Company’s financial results.

The Company and its subsidiaries are subject to various workforce risks, including, but not limited to, the risk that it will be unable to attract and retain qualified personnel; that it will be unable to effectively transfer to new personnel the knowledge and expertise of an aging workforce as those workers retire; and that it will be unable to reach collective bargaining arrangements with the unions that represent certain of its workers, which could result in work stoppages.

The Company may be adversely affected by economic conditions.

Periods of slowed economic activity generally result in decreased energy consumption, particularly by industrial and large commercial companies, a loss of existing customers, and fewer new customers. As a consequence, national or regional recessions or other downturns in economic activity could adversely affect revenues and cash flows or restrict future growth. Economic conditions in the Utilities’ service territories may also adversely impact the Utilities’ ability to collect accounts receivable, resulting in an increase in bad debt expense.

Changes in accounting standards may adversely impact the Company’s financial condition and results of operations.

Spire and its subsidiaries are subject to changes in U.S. generally accepted accounting principles (“GAAP”), SEC regulations, and other interpretations of financial reporting requirements for public utilities. The Company and its

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subsidiaries have no control over the timing or impact of these changes on their financial condition or results of operations. Potential issues related to rate-regulated accounting, along with other changes under consideration, could be significant.

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Item 1B. Unresolved Staff Comments

None.

Item 1C. Cybersecurity

Managing risk related to cybersecurity is a top priority for Spire, and the Company remains focused on addressing threats that would jeopardize the confidentiality, integrity and availability of stakeholders’ information or the ability to continue providing safe and reliable service to customers. To date, Spire has not experienced any material cybersecurity breach that impacts the Company’s business strategy, results of operations, or financial condition.

Risk Management

Enterprise risk management ("ERM") at Spire oversees significant risks to the Company’s ability to successfully execute on strategy and achieve corporate objectives. Spire’s ERM is based on a structured, comprehensive process that leverages ISO 31000:2018, adopted and customized to the Company’s needs, utilizing an ongoing process of risk identification, evaluation, treatment, integration and monitoring. ERM helps assess priorities and facilitate decision-making for resource allocation as it relates to risk management. Two risks prioritized by our Enterprise Risk Oversight Committee related to cybersecurity are cyber threats and vendor management. Additionally, the ERM process is structured to integrate with operational levels, where risk is managed, such as the National Institute of Standards and Technology ("NIST") Cybersecurity Framework 2.0 utilized by the Company’s Information Security function for managing cybersecurity.

Governance

Spire’s Board of Directors (“Board”) recognizes the significance of cybersecurity risk and has therefore retained oversight of cybersecurity rather than delegating this risk to a committee of the Board. Every regular meeting of the Board includes a cybersecurity report provided by the Company’s Chief Information Officer and the Chief Information Security Officer. These reports focus on developments within the Company’s cybersecurity program and provide an update on any cybersecurity events or concerns. In 2024, the Board added a new director with expertise in cybersecurity to assist the Board to appropriately oversee the Company’s efforts.

Spire’s cybersecurity program is led by the Chief Information Officer and the Chief Information Security Officer,who together have over 40 years of experience in information technology and cybersecurity, along with a cross-functional team of technology, legal, physical security and risk leaders.Internal Audit provides assurances of risk management activities, including certain third-party cybersecurity activities, such as penetration testing.

Strategy/Approach

Spire’s cybersecurity team developed a five-year strategic roadmap in 2020, which is reviewed and updated annually. A NIST-based maturity assessment is also conducted annually to assess Spire’s current maturity level and is used to establish initiatives to drive capabilities in key focus areas. Such initiatives were updated to align with federal security directives issued in 2021, with a key focus on increasing overall visibility into the environment to better correlate potential security related items; completing segregation and dependency from the enterprise and industrial control systems environments; and establishing defined policies and procedures to enhance overall governance and risk management.

In addition to these strategic efforts, the Company works closely with federal agencies, including the U.S Department of Homeland Security, TSA and the local FBI chapter, and is actively involved in industry information sharing groups.

The Company’s cybersecurity function is staffed with dedicated professionals who continuously monitor risks and evaluate the resiliency and effectiveness of the architecture and defenses within Spire’s systems.The Company also maintains policies, procedures and standards to manage conduct within Spire and to be prepared for new cybersecurity threats and events. The cybersecurity program involves a variety of training and education to increase awareness of cybersecurity threats through mandatory annual security awareness training for all employees, quarterly phishing campaigns, and table-top exercises. The Company also engages third parties to evaluate potential risks through external penetration testing to assess the efficacy of systems.

Spire maintains business continuity plans to guide the Company’s response to a potential cybersecurity event. These plans are regularly reviewed, tested and updated to ensure they meet the evolving needs of the Company in this area. The Company also conducts annual disaster recovery exercises to test the efficacy of core systems in the event of a catastrophic incident.

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Item 2. Properties

Spire

Refer to the information below about the principal properties of Spire Missouri and Spire Alabama. The Spire EnergySouth utilities own more than 5,500 miles of pipelines. Other properties of Spire and its subsidiaries do not constitute a significant portion of its properties. For information on leases, see Note 17, Leases, of the Notes to Financial Statements in Item 8.

Spire Missouri

The principal properties of Spire Missouri consist of its gas distribution system, which includes more than 32,000 miles of main and related service lines, odorization and regulation facilities, and customer meters. The mains and service lines are located in municipal streets or alleys, public streets or highways, or on lands of others for which Spire Missouri has obtained the necessary legal rights to place and operate its facilities on such property. Spire Missouri has an underground natural gas storage facility, several operating centers, and other related properties. Substantially all of Spire Missouri’s utility plant is subject to the liens of its mortgage. All the properties of Spire Missouri are held in fee, by easement, or under lease agreements.

Spire Alabama

The properties of Spire Alabama consist primarily of its gas distribution system, which includes more than 24,000 miles of main and related service lines, odorization and regulation facilities, and customer meters. The mains and service lines are located in municipal streets or alleys, public streets or highways, or on lands of others for which Spire Alabama has obtained the necessary legal rights to place and operate its facilities on such property. Spire Alabama also has four LNG facilities, several operating centers, and other related properties. All the properties of Spire Alabama are held in fee, by easement, or under lease agreements.

Item 3. Legal Proceedings

For a description of pending regulatory matters of Spire, see Note 15, Regulatory Matters, of the Notes to Financial Statements in Item 8. For a description of environmental and other legal matters, see Contingencies in Note 16 of the Notes to Financial Statements in Item 8.

Item 4. Mine Safety Disclosures

Not applicable.

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INFORMATION ABOUT OUR EXECUTIVE OFFICERS – Listed below are executive officers as defined by the SEC for Spire as of November 14, 2025, along with their ages (as of September 30, 2025), positions and business experience during the past five years.

Name Age Position with Company (1) Appointed (2)

S. E. Doyle (3) 54 President and Chief Executive Officer April 2025

A. W. Woodard 53 Executive Vice President, Chief Financial Officer January 2025

Vice President, Treasurer (until April 2025) July 2018

M. J. Aplington 44 Senior Vice President, Chief Legal Officer January 2025

Vice President, Chief Legal Officer January 2024

General Counsel, Spire Alabama October 2023

General Counsel, Spire Missouri January 2020

T. W. Krick 50 Vice President, Chief Accounting Officer January 2025

Vice President, Controller February 2017

J. B. Hampton 51 Vice President December 2018

President, Spire Alabama December 2018

S. M. Mills 57 Senior Vice President July 2023

President, Spire Missouri July 2023

Vice President and General Manager, Spire Missouri (until July 2023) March 2020

Vice President, Chief Administrative Officer and Corporate Secretary July 2024

Vice President, Corporate Secretary (until July 2024) June 2022

Managing Director, Associate General Counsel (until June 2022) November 2020

Corporate Secretary, Spire Missouri and Spire Alabama January 2022

(1)

The information provided relates to the Company and its principal subsidiaries. Many of the executive officers have served or currently serve as officers or directors for other subsidiaries of the Company.

(2)

Officers are normally reappointed by the respective board of directors in January of each year.

(3)

Prior to joining Spire in 2024, Mr. Doyle served as executive vice president of utility operations at CenterPoint Energy Inc. ("CenterPoint") in Houston, Texas, leading electric and natural gas businesses serving seven million customers across multiple states. Prior to this role, he was CenterPoint's executive vice president of natural gas from April 2019 to January 2022, and he held numerous executive leadership positions of increasing responsibility at CenterPoint in natural gas operations and regulatory and public affairs.

(4)

Mr. Greenley worked for Enbridge Inc. (NYSE: ENB) as Senior Vice President – Commercial Services, Gas Distribution and Storage. Prior to this role, he worked at CenterPoint for over twenty-five years, serving in numerous executive leadership positions, including Senior Vice President - Utility Operations Support, Senior Vice President - Generation Development (Indiana Electric), Senior Vice President - Gas Operations, Natural Gas Distribution, Vice President - Distribution Power Delivery (Houston Electric)

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

Spire

Spire’s common stock trades on The New York Stock Exchange ("NYSE") under the symbol “SR”. The number of holders of record as of November 10, 2025 was 2,274.

Dividends are payable on the Company’s common stock at the discretion of its Board. Spire, and Spire Missouri prior to the holding company’s formation in 2000, has paid common stock dividends continuously since 1946, with 2025 marking the 22nd consecutive year of increasing dividends on an annualized basis. Although the Board expects to continue paying dividends on the common stock for the foreseeable future, the declaration of dividends is not guaranteed. The amount of dividends on the common stock, if any, will depend upon the Company’s financial condition, results of operations, capital requirements, and other factors.

Performance Graph

COMPARISON OF FIVE-YEAR CUMULATIVE TOTAL RETURN*

* Cumulative total return is based on a $100 investment on September 30, 2020, assuming reinvestment of dividends.

The S&P 500 Utilities Index is comprised of approximately 30 utilities heavily weighted to large capitalization (median market cap of $31.3 billion) electric utilities. In recent years, stocks of small- and mid-cap electric utilities and gas utility companies (like Spire) in general traded lower relative to the large-cap electric sector.

For disclosures related to securities authorized for issuance under equity compensation plans, see Note 3, Stock-Based Compensation, of the Notes to Financial Statements in Item 8.

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During the three months ended September 30, 2025, there were no repurchases of the Company’s common stock.

Spire Missouri

Spire Missouri common stock is owned by its parent, Spire Inc., and is not traded on any stock exchange.

Spire Missouri’s outstanding first mortgage bonds contain restrictions on its ability to pay cash dividends on its common stock, as described in further detail in Note 5, Shareholders’ Equity, of the Notes to Financial Statements in Item 8. As of September 30, 2025 and 2024, the amount under the mortgage’s formula that was available to pay dividends was $1,999.8 million and $1,797.0 million, respectively, so all of Spire Missouri’s retained earnings were free from such restrictions.

Spire Alabama

Spire Alabama common stock is owned by its parent, Spire Inc., and is not traded on any stock exchange.

Item 6. (Reserved)

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

(Dollars in millions, except per share and per unit amounts)

INTRODUCTION

This section analyzes the financial condition and results of operations of Spire, Spire Missouri, and Spire Alabama. Refer to Item 1, Business, for descriptions of the businesses and the Company’s reportable segments. This Item 7 includes management’s discussion and analysis of financial results including changes in earnings and costs from the prior periods, as well as their financial condition and liquidity. Unless otherwise indicated, references to years herein are references to the fiscal years ending September 30 for the Company and its subsidiaries.

Reference is made to “Forward-Looking Statements” and Item 1A, Risk Factors, in Part I, which describe important factors that could cause actual results to differ from expectations and non-historical information contained herein. In addition, the following discussion should be read in conjunction with the audited financial statements and accompanying notes thereto of Spire, Spire Missouri and Spire Alabama included in Item 8, Financial Statements and Supplementary Data.

NON-GAAP MEASURES

Net income, earnings per share and operating income reported by Spire, Spire Missouri and Spire Alabama are determined in accordance with GAAP. Spire, Spire Missouri and Spire Alabama also provide the non-GAAP financial measures of adjusted earnings, adjusted earnings per share and contribution margin. Management and the Board of Directors use non-GAAP financial measures, in addition to GAAP financial measures, to understand and compare operating results across accounting periods, for financial and operational decision making, for planning and forecasting, to determine incentive compensation and to evaluate financial performance. These non-GAAP operating metrics should not be considered as alternatives to, or more meaningful than, the related GAAP measures. Reconciliations of non-GAAP financial measures to the most directly comparable GAAP measures are provided on the following pages.

Adjusted Earnings and Adjusted Earnings Per Share

Adjusted earnings and adjusted earnings per share are non-GAAP measures that exclude from net income, as applicable, the impacts of fair value accounting and timing adjustments associated with energy-related transactions, the impacts of acquisition, divestiture and restructuring activities, and the largely non-cash impacts of impairments and other non-recurring or unusual items such as certain regulatory, legislative or GAAP standard-setting actions. In addition, adjusted earnings per share would exclude the impact, in the fiscal year of issuance, of any shares issued to finance acquisitions that have yet to be included in adjusted earnings.

The fair value and timing adjustments are made in instances where the accounting treatment differs from what management considers the economic substance of the underlying transaction, including the following:

•

Net unrealized gains and losses on energy-related derivatives that are required by GAAP fair value accounting associated with current changes in the fair value of financial and physical transactions prior to their completion and settlement. These unrealized gains and losses result primarily from two sources:

changes in the fair values of physical and/or financial derivatives prior to the period of settlement; and

ineffective portions of accounting hedges, required to be recorded in earnings prior to settlement, due to differences in commodity price changes between the locations of the forecasted physical purchase or sale transactions and the locations of the underlying hedge instruments;

•

Lower of cost or market adjustments to the carrying value of commodity inventories resulting when the net realizable value of the commodity falls below its original cost, to the extent that those commodities are economically hedged; and

•

Realized gains and losses resulting from the settlement of economic hedges prior to the sale of the physical commodity.

These adjustments eliminate the impact of timing differences and the impact of current changes in the fair value of financial and physical transactions prior to their completion and settlement. Unrealized gains or losses are recorded in each period until being replaced with the actual gains or losses realized when the associated physical transactions occur. Management believes that excluding the earnings volatility caused by recognizing changes in fair value prior to settlement and other timing differences associated with related purchase and sale transactions provides a useful representation of the economic effects of only the actual settled transactions and their effects on results of operations. While management uses these non-GAAP measures to evaluate all of its businesses, the net effect of these fair value and timing adjustments on the Utilities’ earnings is minimal because gains or losses on their natural gas derivative instruments are deferred pursuant to state regulation.

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Contribution Margin

In addition to operating revenues and operating expenses, management also uses the non-GAAP measure of contribution margin when evaluating results of operations. Contribution margin is defined as operating revenues less natural gas costs and gross receipts tax expense. The Utilities pass to their customers (subject to prudence review by, as applicable, the MoPSC, APSC or MSPSC) increases and decreases in the wholesale cost of natural gas in accordance with their PGA clauses or GSA riders. The volatility of the wholesale natural gas market results in fluctuations from period to period in the recorded levels of, among other items, revenues and natural gas cost expense. Nevertheless, increases and decreases in the cost of gas associated with system gas sales volumes and gross receipts tax expense (which are calculated as a percentage of revenues), with the same amount (excluding immaterial timing differences) included in revenues, have no direct effect on operating income. Therefore, management believes that contribution margin is a useful supplemental measure, along with the remaining operating expenses, for assessing the Company’s and the Utilities’ performance.

PENDING ACQUISITION

On July 27, 2025, Spire entered into an agreement with Piedmont Natural Gas, a wholly-owned Subsidiary of Duke Energy, to acquire its Tennessee natural gas business that serves more than 200,000 customers in the Nashville area (the “Transaction”). The strategic rationale for the Company is described below:

•

We expect the Transaction to allow Spire to significantly expand its regulated utility footprint in high-quality jurisdictions and significantly increase the scale of its regulated business while delivering on Spire’s commitment to growth and creating long-term shareholder value.

•

We expect the Transaction to provide robust growth driven by customer additions and system integrity and reliability investments, aligned with Spire’s investment strategy. These long-term investments are expected to be supported by Tennessee’s constructive regulatory environment support of natural gas.

•

We expect the Transaction to support Spire’s long-term adjusted earnings per share growth expectations and provide meaningful investment opportunities. The acquisition is expected to generate incremental cash flow to support investment in the business, shareholder returns and dividend growth.

The stated purchase price of the Transaction is $2.48 billion subject to adjustment, including adjustments based on net working capital, regulatory assets and liabilities and capital expenditures at closing. The Transaction is supported by a fully committed bridge facility with Bank of Montreal ("BMO") Capital Markets Corp. for the entire purchase price.

We expect permanent financing for the acquisition to be provided through a balanced mix of debt, equity, and hybrid securities. As part of the financing plan, Spire is considering the sale of its natural gas storage facilities, Spire Storage West LLC and Spire Storage Salt Plains LLC, to help fund the acquisition. The sale would be subject to board approval and customary closing conditions, including regulatory approval.

The transaction is expected to close in the first quarter of calendar 2026, subject to customary closing conditions, including approval by the Tennessee Public Utility Commission ("TPUC"). On October 31, 2025, FERC approved the transfer of gas supply contracts to Spire. The applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act expired without objection, satisfying one of the key regulatory requirements for the transaction.

EARNINGS

This section contains discussion and analysis of the results for the year ended September 30, 2025 compared to the results for the year ended September 30, 2024. The discussion and analysis of the results for the year ended September 30, 2024 compared to the results of the year ended September 30, 2023 can be found in Part II, Item 7 of Spire Inc.’s fiscal 2024 Annual Report on Form 10-K, filed with the SEC on November 20, 2024.

The following sections present and discuss the financial metrics in total and by registrant and segment.

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Spire

The following tables reconcile the Company’s adjusted earnings to net income.

Per

Gas Gas Consol- Diluted

Utility Marketing Midstream Other idated Share**

Adjustments, pre-tax:

Fair value and timing adjustments — (10.4 ) — — (10.4 ) (0.17 )

Income tax effect of adjustments* — 2.6 — (3.6 ) (1.0 ) (0.02 )

Adjustments, pre-tax:

Fair value and timing adjustments — (12.4 ) — — (12.4 ) (0.22 )

Acquisition and restructuring activities activities 5.0 — 2.3 0.3 7.6 0.14

Income tax effect of adjustments* (1.2 ) 3.1 (0.5 ) (0.1 ) 1.3 0.02

Adjustments, pre-tax:

Fair value and timing adjustments — 11.4 — — 11.4 0.21

Acquisition activities — — 2.5 — 2.5 0.05

Income tax effect of adjustments* — (2.9 ) (0.4 ) — (3.3 ) (0.06 )

*Income tax adjustments include amounts calculated by applying federal, state, and local income tax rates applicable to ordinary income to the amounts of the pre-tax reconciling items.

** Adjusted earnings per share is calculated by replacing consolidated net income with consolidated adjusted earnings in the diluted earnings per share calculation, which includes reductions for cumulative preferred dividends and participating shares.

Reconciliations of contribution margin to the most directly comparable GAAP measure are shown below.

Gas Gas

Utility Marketing Midstream Other Eliminations Consolidated

Less: Gross receipts tax expense (115.5 ) (0.2 ) — — — (115.7 )

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Gas Gas

Utility Marketing Midstream Other Eliminations Consolidated

Less: Gross receipts tax expense (128.0 ) (0.2 ) — — — (128.2 )

Gas Gas

Utility Marketing Midstream Other Eliminations Consolidated

Less: Gross receipts tax expense (131.5 ) (0.3 ) — — — (131.8 )

Select changes from the year ended September 30, 2024 to the year ended September 30, 2025 are summarized in the following table and discussed below.

Gas Gas Other, Net of

Changes FY25 from FY24 Utility Marketing Midstream Eliminations Consolidated

Other Income (Expense) (10.8 )

Interest Expense 3.0

Income Tax 1.0

Interest expense reflects the impact of $5.4 in costs associated with the bridge facility backing the Piedmont Tennessee acquisition. Excluding this amount, interest expense declined $2.4 year-over-year. The decrease in interest expense reflects lower effective interest rates partially offset by higher average levels of debt in the current year. Weighted-average short-term interest rates were 4.5% in the current-year period versus 5.7% in the prior-year period, while weighted average interest rate on long-term debt decreased slightly from the prior year.

Other income decreased $10.8 versus the prior-year period, $20.2 excluding the impact of the Postretirement Non-Service Costs Transfer (“NSC Transfer”), which has no impact on net income. The principal drivers of the decline was a one-time $8.2 pre-tax hedging gain recognized in the prior year period, and a decline of gas-carrying cost credits at Spire Missouri of $9.4.

The increase in income taxes primarily reflects the higher current-year pre-tax book income.

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Gas Utility

For the twelve months ended September 30, 2025, Gas Utility net income and adjusted earnings were higher than the corresponding prior-year period by $14.4 and $10.6, respectively. Adjusted earnings growth was lower than net income growth primarily due to excluding the $3.8 after-tax charge relating to the customer affordability initiative that was recorded in the prior year. The year-to-date change in net income was driven by growth at both Spire Missouri and Spire Alabama totaling $9.9 and $4.8, respectively.

The decrease in Gas Utility operating revenues for fiscal 2025 was attributable to the following factors:

Spire Missouri and Spire Alabama – Lower PGA/GSA gas cost recoveries $ (285.5 )

Spire Missouri and Spire Alabama – Lower gross receipt taxes (12.4 )

Spire Missouri – Infrastructure System Replacement Surcharge (ISRS) 33.5

Spire Missouri and Spire Alabama– Off-system sales and capacity release 28.4

Spire Alabama – RSE adjustments 5.2

All other factors (5.9 )

Total Variation $ (230.3 )

The primary driver of the current year decrease in revenue was the $285.5 impact of lower gas cost recoveries across all utilities, driven principally by lower PGA rates at Spire Missouri. This was only partly offset by higher current year ISRS billings and higher off-system sales, impacts of Spire Missouri's and Spire Alabama’s volumetric usage, and favorable Spire Alabama RSE adjustments.

The year-over-year increase in Gas Utility contribution margin was attributable to the following factors:

Spire Missouri – ISRS $ 33.5

Spire Alabama – RSE adjustments 5.0

Spire Missouri and Spire Alabama– Off-system sales and capacity release 4.1

Spire Alabama – Volumetric usage including weather mitigation impact (3.0 )

All other factors (2.1 )

Total Variation $ 37.5

Contribution margin increased $37.5 versus the comparable prior-year period. Contribution margin benefited from the $33.5 Spire Missouri ISRS growth, $5.0 of growth from Spire Alabama’s RSE adjustments, and higher off-system sales. These favorable impacts more than offset the $3.0 negative impact of Spire Alabama’s volume usage net of weather mitigation adjustments and lower net other factors.

Reported operation and maintenance (“O&M”) expenses for the twelve months ended September 30, 2025 were $14.3 higher than the twelve months ended September 30, 2024. Removing the impact of the NSC Transfer, O&M expenses were $4.7 higher than the prior-year period. After excluding the $5.0 prior year charge relating to the Company’s customer affordability initiative, O&M expenses were $9.7 higher than the corresponding prior-year period. Higher employee-related costs in the current year, combined with higher field operations costs, were only partly mitigated by lower bad debts expense, and lower support costs.

Taxes, other than income taxes, decreased $8.9, as the $12.5 lower gross receipt taxes resulting from lower revenues more than offset higher property taxes. Depreciation and amortization expenses for the year ended September 30, 2025 were $14.0 higher than the same period in the prior year primarily driven by continued infrastructure capital expenditures across all the Utilities.

Interest expense decreased $10.2, with both Spire Missouri and Spire Alabama benefiting from lower average short-term interest rates in the current year.

The benefit of carrying cost credits at Spire Missouri, included in other income, decreased $9.4 versus the corresponding prior-year period.

Gas Marketing

Including $1.5 (after-tax) unfavorable mark-to-market activity, net income increased $1.0. The $2.5 year-over-year increase in adjusted earnings reflects realized business portfolio optimization opportunities that more than offset lower regional basis differentials, and higher storage and transportation fees in the current year.

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Contribution margin increased $1.4 versus the prior-year period, reflecting the $2.0 (pre-tax) unfavorable mark-to-market activity. Excluding this impact, contribution margin increased $3.4, reflecting realized business portfolio optimization opportunities that more than offset lower regional basis differentials, and higher storage and transportation fees in the current year.

O&M expenses were $1.2 higher than prior-year levels, the result of higher spend on outside services and higher employee costs in the current year.

Midstream

Our Midstream segment includes storage and pipeline operations which currently consist of an approximate year-to-date net income mix of 73% and 27%, respectively. Net income and adjusted earnings for the Company’s Midstream segment for the twelve months ended September 30, 2025 versus the comparable prior-year period increased $24.6 and $22.8, respectively. Approximately 96% of the adjusted earnings increase was attributable to our storage operations. The increase was driven by higher storage earnings, reflecting increased asset optimization, additional storage capacity and contract renewals at higher rates, combined with the acquisition of MoGas in the second quarter of the prior year.

Revenues in the current year increased $54.8 versus the prior-year period, reflecting the higher rates and activity with storage. O&M expenses were up $10.6 year-over-year, due primarily to costs associated with the higher storage activity in the current year, combined with non-recurring Spire MoGas acquisition costs of $2.3 in the prior year.

Other

The Company’s other activities generated a $49.7 loss in the twelve months ended September 30, 2025, $19.2 higher than the prior year. The major contributor to this variance was the $14.9 pre-tax ($11.4 after-tax) increase in acquisition and restructuring activities due to our recently announced Piedmont Tennessee acquisition, combined with the $8.2 ($6.3 after-tax) interest rate swap gain in the prior year that did not repeat. The remaining variance was mostly a result of higher interest expense in the current year that was only partly offset by lower corporate expenses.

Spire Missouri

Year Ended September 30,

Operation and maintenance expenses 300.7 287.4

Depreciation and amortization 188.4 174.0

Taxes, other than income taxes 151.1 157.7

Less: Gross receipts tax expense (82.9 ) (93.1 )

Contribution Margin [Non-GAAP] 791.8 758.1

Gross receipts tax expense 82.9 93.1

Revenues for the twelve months ended September 30, 2025 were $193.3 lower than the comparable prior-year period. Lower PGA rates reduced gas cost recoveries by $239.8. This reduced revenue driver also resulted in reduced gross receipts taxes of $10.2. These negative impacts were only partly offset by $33.5 incremental ISRS revenues, $23.2 attributable to higher off-system sales in the current-year, and increased weather-mitigated customer usage versus the prior-year period.

Contribution margin for the twelve months ended September 30, 2025 increased $33.7 from the same period in the prior year, primarily due to the $33.5 incremental ISRS billings and favorable $1.2 off-system sales impact.

Degree days in Spire Missouri’s service areas during the twelve months ended September 30, 2025 were 8.7% warmer than normal (normal currently defined as past 30-year average), though 11.8% colder than the same period last year. Spire Missouri’s total system volume sold and transported were 1,570.0 million centum (Latin for “hundred”) cubic feet (CCF) for the current year, compared with 1,469.2 million CCF for the same period in the prior year. Total off-system volume sold and transported were 77.7 million CCF for the current-year, compared with 38.2 million CCF a year ago.

Reported O&M expenses for the twelve months ended September 30, 2025 increased $13.3 versus the corresponding prior-year period. Removing the NSC Transfer impact, O&M expense increased $1.5. After excluding the $3.6 prior-year charge relating to the Company’s customer affordability initiative, O&M expenses were $5.1 higher than the corresponding

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prior year period. Higher field operations and employee-related costs were only partly mitigated by lower bad debt expense costs and lower Administrative and General (“A&G”) and support function costs resulting from customer affordability initiatives implemented last year.

Depreciation and amortization expenses increased $14.4 versus the comparable prior-year period due to ongoing capital investments. Taxes, other than income taxes decreased $6.6, as $10.2 lower pass-through gross receipts taxes more than offset the increase in property tax.

Other income declined by $0.6 versus the prior-year period, $12.4 after excluding the impact of the NSC Transfer. The decrease was primarily driven by the decrease in carrying cost credits of $9.4 and unfavorable mark-to-market unrealized losses on non-qualified benefit trusts.

Interest expense decreased $6.2, primarily reflecting lower average short-term interest rates in the current year that offset the impact of higher average debt levels.

Resulting net income for the twelve months ended September 30, 2025 increased $9.9 versus the twelve months ended September 30, 2024.

Spire Alabama

Year Ended September 30,

Operation and maintenance expenses 137.1 135.6

Depreciation and amortization 71.0 72.8

Taxes, other than income taxes 40.2 42.7

Less: Gross receipts tax expense (27.9 ) (30.1 )

Contribution Margin [Non-GAAP] 362.9 359.3

Gross receipts tax expense 27.9 30.1

Operating revenues for the twelve months ended September 30, 2025 decreased $33.7 from the same period in the prior year. The decrease in operating revenue was principally due to a $45.7 decrease in gas cost recovery, combined with lower gross receipts taxes totaling $2.2. These negative impacts were only partly offset by volumetric usage totaling $5.2, and favorable RSE renewal of $5.2.

Contribution margin was $3.6 higher versus the prior-year period, driven primarily by a net favorable $5.0 RSE update and higher off-system sales, partially offset by net unfavorable volume usage and weather mitigation adjustments of $3.0 and $0.5 lower CCM benefit.

As measured in degree days, temperatures in Spire Alabama’s service area during the twelve months ended September 30, 2025, were 4.2% warmer than normal, but 2.9% colder than a year ago. Spire Alabama’s total system volume sold and transported were 1,080.8 million CCF for the twelve months ended September 30, 2025, compared with 1,036.7 million CCF for the same period in the prior year. Total off-system volume sold and transported were 83.7 million CCF for the current-year period, compared with 90.9 million CCF off-system volume sold and transported in the prior-year period.

SR US Equity

SR · 10-K · period ended 2025-09-30

Item 1. Business

Item 1A. Risk Factors

Item 1B. Unresolved Staff Comments

Item 1C. Cybersecurity

Item 2. Properties

Item 3. Legal Proceedings

Item 4. Mine Safety Disclosures

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

Item 6. (Reserved)

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

SR US Equity☆

SR · 10-K · period ended 2025-09-30

Item 1. Business

Item 1A. Risk Factors

Item 1B. Unresolved Staff Comments

Item 1C. Cybersecurity

Item 2. Properties

Item 3. Legal Proceedings

Item 4. Mine Safety Disclosures

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

Item 6. (Reserved)

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

SR US Equity