apvo-10k_20211231.htm

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

For the fiscal year ended December 31, 2021

Commission File Number 001-37746

APTEVO THERAPEUTICS INC.

(Exact name of Registrant as specified in its Charter)

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: (206) 838-0500

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class Trading Symbol Name of Exchange on Which Registered

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes☐No☒

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes☐No☒

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 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. Yes☒No☐

Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). Yes☒No☐

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

Large accelerated filer ☐ Accelerated filer ☐

Non-accelerated filer ☒ Smaller reporting company ☒

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the 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. ☐

Indicate by check mark whether the 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. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes☐No☒

The aggregate market value of common stock held by non-affiliates of the Registrant as of June 30, 2021, the last business day of the Registrant’s most recently completed second fiscal quarter, was $93.1 million, based upon the closing price of the Registrant’s common stock on the Nasdaq Stock Market LLC on June 30, 2021, the last trading day of the fiscal quarter.

Excludes an aggregate of 258,172 shares of the Registrant’s common stock held as of such date by officers, directors, and stockholders that the registrant has concluded are or were affiliates of the Registrant. Exclusion of such shares should not be construed to indicate that the holder of any such shares possesses the power, direct or indirect, to direct or cause the direction of the management or policies of the Registrant or that such person is controlled by or under common control with the Registrant.

As of March 24, 2022, the number of shares of Registrant’s common stock outstanding was 5,007,241.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A, not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, relating to the Registrant’s 2022 Annual Meeting of Stockholders are incorporated by reference into Part III of this Report.

Table of Contents

Page

PART I

Item 1. Business 1

Item 1A. Risk Factors 19

Item 1B. Unresolved Staff Comments 55

Item 2. Properties 55

Item 3. Legal Proceedings 55

Item 4. Mine Safety Disclosures 55

PART II

Item 6. [Reserved] 56

Item 7A. Quantitative and Qualitative Disclosures About Market Risk 66

Item 8. Financial Statements and Supplementary Data 67

Item 9A. Controls and Procedures 92

Item 9B. Other Information 92

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections 92

PART III

Item 10. Directors, Executive Officers and Corporate Governance 93

Item 11. Executive Compensation 93

Item 14. Principal Accountant Fees and Services 93

PART IV

Item 15. Exhibits, Financial Statement Schedules 94

In this Annual Report on Form 10-K, “we,” “our,” “us,” “Aptevo,” and the “Company” refer to Aptevo Therapeutics Inc. and, where appropriate, its consolidated subsidiaries.

PART I

Cautionary Note Regarding Forward-Looking Information

This Annual Report on Form 10-K includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the Exchange Act). Statements in this Annual Report on Form 10-K, other than statements of historical facts, including statements regarding our strategy, future operations, future financial position, future revenues, projected costs, prospects, plans, intentions, expectations, and objectives could be forward-looking statements. The words “anticipates,” “believes,” “could,” “designed,” “estimates,” “expects,” “goal,” “intends,” “may,” “plans,” “projects,” “pursuing,” “will,” “would” and similar expressions (including the negatives thereof) are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Any forward-looking statements are based upon management’s assumptions, expectations, projections, intentions, objectives and/or beliefs about future events or occurrences and are subject to a number of risks and uncertainties. The timing of certain events and circumstances and known and unknown risks and uncertainties could cause actual results to differ materially from the plans, intentions, expectations and objectives underlying or disclosed in the forward-looking statements that we make. Therefore, you should not place undue reliance on our forward-looking statements. Some factors that we believe could cause actual results or events to differ materially from our forward-looking statements include, but are not limited to, those discussed in “Risk Factors”, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in this Annual Report on Form 10-K. Our forward-looking statements in this Annual Report on Form 10-K are based on current information and we do not assume any obligation to update any forward-looking statements expect as required by the federal securities laws.

You should read the following discussion and analysis together with the financial statements and the related notes to those statements included elsewhere in this Annual Report on Form 10-K.

Item 1. Business.

OVERVIEW

We are a clinical-stage, research and development biotechnology company focused on developing novel immunotherapeutic candidates for the treatment of different forms of cancer. We have developed two versatile and enabling platform technologies for rational design of precision immune modulatory drugs. Our lead clinical candidate, APVO436, and preclinical candidates, ALG.APV-527 and APVO603, were developed using our ADAPTIRTM modular protein technology platform. Our preclinical candidate APVO442 was developed using our ADAPTIR-FLEXTM modular protein technology platform.

The versatile and robust ADAPTIR and ADAPTIR-FLEX platforms are designed to generate monospecific, bispecific, and multi-specific antibody candidates that are capable of enhancing the human immune system against cancer cells. ADAPTIR and ADAPTIR-FLEX are both modular platforms, which gives us the flexibility to generate immunotherapeutic candidates with a variety of mechanisms of action. This flexibility in design allows us to potentially generate novel therapeutic candidates that may provide the foundation for the establishment of effective strategies against difficult to treat, as well as advanced forms cancer. We have successfully designed and constructed numerous investigational-stage prototype product candidates based on our ADAPTIR platform. The ADAPTIR platform technology is designed to generate monospecific and bispecific immunotherapeutic proteins that specifically bind to one or more targets, for example, bispecific therapeutic molecules, which may have structural and functional advantages over monoclonal antibodies. The structural differences of ADAPTIR molecules over monoclonal antibodies allow for the development of ADAPTIR immunotherapeutics that are designed to engage immune effector cells and disease targets in a novel manner to produce unique signaling responses and ultimately kill tumors or modulate the immune system to kill tumors.

We are skilled at candidate generation, validation, and subsequent preclinical and clinical development using the ADAPTIR platform and have added the ADAPTIR-FLEX platform to generate multi-specific candidates or other candidates to our platform capabilities. We have developed preclinical candidate based on the ADAPTIR-FLEX platform which is advancing in our pipeline. We are developing our ADAPTIR and ADAPTIR-FLEX molecules by way of our protein engineering, preclinical development, process development, and clinical development capabilities.

STRATEGY

We seek to grow our business by, among other things:

Advancing our lead clinical stage candidate, APVO436, through clinical development to evaluate its therapeutic potential alone and in combination with other therapies. We are continuing enrollment and dosing in a Phase 1b dose expansion study. This is a multi-center, multi-cohort trial designed to evaluate APVO436 in adult patients with acute myeloid leukemia (AML) both in monotherapy and in combination with current standard-of care therapies. Enrollment is on-going at multiple centers across the United States. The Company is actively recruiting new centers to participate in the trial, and plans to be open in up to 20 clinical sites nationally.

Advancing our preclinical stage candidate, ALG.APV-527, developed in partnership with Alligator Bioscience AB (Alligator), into clinical stage. Aptevo and Alligator continue to advance preclinical candidate, ALG.APV-527 for the treatment of solid tumors, into the clinic and expect to file an IND with the FDA in the US in the second half of 2022. A first-in-human study is expected to start in the second half of 2022. ALG.APV-527 targets 4-1BB (T lymphocyte co-stimulatory receptor) and 5TA (tumor antigen) and is designed to reactivate antigen-primed T cells.

Advancing our ADAPTIR and ADAPTIR-FLEX platforms, focusing on immunotherapy and the development of novel bispecific and multi-specific proteins for the treatment of cancer. We focus on product development using our ADAPTIR and ADAPTIR-FLEX platforms. We plan to generate additional monospecific, bispecific, and multi-specific protein immunotherapies for development, potentially with other collaborative partners, to exploit the potential of the ADAPTIR and ADAPTIR-FLEX platforms. We will select novel candidates that have the potential to demonstrate proof of concept early in development and are differentiated in key oncology indications. We expect to continue to expand the ADAPTIR and ADAPTIR-FLEX product pipelines to address areas of unmet medical need. Our goal is to generate monospecific, bispecific, and multi-specific ADAPTIR and ADAPTIR-FLEX proteins to target tumors using the immune system or direct cytokine delivery to selective cell populations or modulate immune cells to treat diseases. We believe these product candidates may have utility in oncology and other therapeutic areas.

Continuing to develop new products. We are committed to new product development. We have expertise in molecular and cellular biology, immunology, oncology, pharmacology, translational services, antibody engineering and the development of protein therapeutics. This includes target validation, preclinical proof of concept, cell line development, protein purification, assay and process development and analytical characterization. We believe that these core areas of expertise enable the development of therapeutics based on the ADAPTIR and ADAPTIR-FLEX platform technologies from design, preclinical testing, IND preparation, and clinical development to preparation of a biologics license application, or BLA.

Establishing collaborative partnerships to broaden our pipeline and provide funding for research and development. We intend to continue to develop and grow our product portfolio through internal research and development as well as through collaborations with other biotechnology and pharmaceutical companies, academia, and non-governmental organizations.

PLATFORM TECHNOLOGY AND PRODUCT CANDIDATES

Characteristics Technology

ADAPTIR ADAPTIR-FLEX

Drug Targeting Bind up to two targets Bind up to four targets

Manufacturing Antibody-like manufacturing processes

Platform Technology

ADAPTIR and ADAPTIR-FLEX Platform Technologies. The ADAPTIR and ADAPTIR-FLEX platform technologies can be used to produce monospecific, bispecific, and multi-specific immunotherapeutic proteins. These protein candidates bind to one or more targets found on tumor cells, immune cells, or other cells in the body or circulation to either amplify, suppress, or regulate the body’s defense mechanisms to treat cancer. We focus on developing drugs for treatment of oncology indications, but also may pursue other indications including autoimmune diseases. We believe we are well positioned for the development of monospecific, bispecific, or multi-specific therapeutics, which are antibody-based molecules that are able to bind one or more targets of therapeutic interest, utilizing our innovative ADAPTIR (modular protein technology) and ADAPTIR-FLEX platform technologies. This allows us to take a novel approach to cancer immunotherapy or for treatment of other diseases.

Structurally, ADAPTIR and ADAPTIR-FLEX molecules are similar to antibodies; they can exhibit the same biological functions of an antibody but can be easily modified to either eliminate or incorporate new activities, while maintaining a similar size, stability, half-life and manufacturing advantages of a monoclonal antibody. The ADAPTIR molecules are single-chain polypeptides comprising customized elements, including a protein domain that binds to one or more targets connected to the hinge domain and a set of antibody constant domains known as the fragment crystallizable region, or Fc region of a human antibody. A second protein domain can be connected to the Fc region using a linker. The antibody Fc region can elicit an immune response by binding to the corresponding Fc receptors found on various immune cells such as natural killer (NK) cells, and other cells bearing Fc receptors to mediate antibody-dependent cell cytotoxicity resulting in killing the target. With the ADAPTIR platform, the Fc region can be modified to enhance or eliminate these functions. Incorporation of the Fc region into the ADAPTIR platform also provides for an extended serum half-life by engaging recycling via the neonatal Fc receptor or FcRn. A long serum half-life could potentially reduce dosing frequency and dose quantity. The ADAPTIR-FLEX molecules are comprised of at least two polypeptides that are comprised of customized elements similar to ADAPTIR candidates. The Fc region of these molecules can be modified to enable formation of a stable heterodimer. These candidates have similar mutations in the Fc region as ADAPTIR candidates to enable or eliminate binding to Fc receptors but retaining binding to FcRn to provide for an extended serum half-life.

The ADAPTIR platform technology enables the design of both monospecific and bispecific bi-valent protein therapeutics.

Bispecific ADAPTIR molecules are similar in structure to monospecific ADAPTIR molecules, with the exception that they have two customized target binding domains on the ends of the Fc region. We have created several bispecific molecules that are able to redirect T-cell cytotoxicity (RTCC). T-cells are white blood cells that fight infections and tumor cells. RTCC ADAPTIR molecules are designed to activate T-cells to specifically kill a tumor. The RTCC ADAPTIR does so by binding to a common component CD3, a receptor complex that activates T cells, when engaging a specific tumor antigen on a specific tumor via the second binding domain, thereby activating the T-cell to kill the tumor.

Our ADAPTIR-FLEX platform technology extends advantages of ADAPTIR technology to create protein therapeutics with varied specificity and valency and potentially new modes of action.

ADAPTIR-FLEX molecules are composed of two different polypeptides that form a dimer through modifying specific sequences in the Fc region of each polypeptide. Each end of the polypeptide may contain one or two different binding domains, enabling the ADAPTIR-FLEX molecules to bind up to four targets. In addition, the ADAPTIR-FLEX platform can be used to modify the valency of binding to each target, which means it can bind a target, through one binding domain or through multiple binding domains, to a specific target to enable modifying the strength of binding to a specific target.

We believe that ADAPTIR and ADAPTIR-FLEX are promising platform technologies within the rapidly growing field of immuno-oncology therapeutics. The structural differences between ADAPTIR and ADAPTIR-FLEX molecules and monoclonal antibodies allow for the development of new immunotherapeutics that engage disease targets in a novel manner and produce a unique signaling response. By customizing the binding domains of our molecules, we can select the desired potency, half-life, toxicity and stability/manufacturability. We have the potential to develop products with mechanisms of action including, but not limited to, RTCC, modulating signals through immunostimulatory or immunoinhibitory receptors and targeted cytokine delivery. We can expand our ADAPTIR and ADAPTIR-FLEX platforms to generate monospecifics, bispecifics, or multi-specifics that target tumor antigens in combination with costimulatory molecules, including TNF-Receptor family members and other activating or inhibitory signaling receptors. We believe the ADAPTIR and ADAPTIR-FLEX platform technologies may prove to have advantages over other immunotherapeutics and other bispecific T-cell engaging technologies. In preclinical studies, we gathered data indicating that APVO436, a RTCC ADAPTIR bispecific that binds CD123, may have high potency and activity at low doses, a long half-life, and reduced cytokine release compared to other bispecifics targeting the same tumor antigens and CD3. The ADAPTIR and ADAPTIR-FLEX monospecifics, bispecifics, and multi-specifics can be produced using standard manufacturing practices. Further clinical and preclinical studies may not confirm or establish the anticipated benefits of this platform.

Our ADAPTIR and ADAPTIR-FLEX platform intellectual property (IP) portfolio consists of IP that we solely own and control, with the exception of non-exclusive licenses to Chinese hamster ovary (CHO) cell lines and related expression systems, and a non-exclusive license to certain transgenic rodents of Open Monoclonal Technology, Inc.’s OmniAb platform, which we non-exclusively license from various third parties. See “Intellectual Property”

for additional information about the ownership rights to ADAPTIR and ADAPTIR-FLEX platform intellectual property.

Product Portfolio

Our current product candidate pipeline is summarized in the table below:

Product Candidates

Our pipeline includes investigational clinical and preclinical stage anti-cancer drug candidates with clinical impact potential for treating both hematologic malignancies, also known as “liquid” tumors, and solid tumor malignancies.

APVO436. a bispecific CD3xCD123 ADAPTIR that is designed to engage CD3 and CD123 to redirect T-cells to destroy leukemia cells expressing the target CD123 molecule on their surface. This antibody-like recombinant protein therapeutic is designed to engage both leukemia cells and T-cells of the immune system and activate T cells only when engaging CD3 to trigger the destruction of leukemia cells. Importantly, CD123 is not only expressed on the leukemic blast cells but is also expressed on leukemic stem cells, differentiating it from other tumor antigens. APVO436 has been engineered using Aptevo's proprietary platform technology and is uniquely designed to reduce the likelihood and severity of cytokine release syndrome (CRS). APVO436 has received orphan drug designation ("orphan status") for acute myeloid leukemia (AML) according to the Orphan Drug Act.

In Part 2 of APVO436-5001 which is the dose expansion of this Phase 1b multi-center study, 5 cohorts of AML patients are being simultaneously enrolled to evaluate up to 90 adult patients. Cohorts include both monotherapy and combination therapy protocols including current standard of care therapies. The Company anticipates using the outcomes from the Phase 1b trial to inform the APVO436 advanced clinical program. A patient who experienced complete remission was reported on November 23, 2021. On February 9, 2022, Aptevo announced that this patient will proceed to transplant. Complete remission and transplant in patients who have failed prior frontline therapy such as this one, are indicators that the patient is making positive clinical progress in fighting this difficult-to-treat disease. The expansion trial is designed to evaluate the safety and tolerability of APVO436 when it is used as an adjunct to the standard of care and as monotherapy, and to obtain a preliminary assessment of the anti-leukemia activity of APVO436 in both modalities.

Overview of Cohorts:5 cohorts enrolling in parallel at up to 20 trial sites in the U.S. – up to 18 patients per cohort are planned for a total of 90 patients.

Cohort Cohort Therapy Description

In 2021, the Company completed a Phase 1b open-label, dose-escalation clinical trial in the U.S. evaluating APVO436. Patients received APVO436 by intravenous dosing for up to six 28-day cycles. The objective of the trial was to evaluate safety, pharmacokinetics, and pharmacodynamics of APVO436 in AML and MDS patients. Forty-six patients with both AML and MDS were enrolled in the trial. A recent presentation at the American Society of Hematology (ASH) revealed the safety profile and some preliminary efficacy data in a heavily pretreated population. APVO436 was generally well tolerated and two patients with unfavorable cytogenetics and/or adverse risk genomic mutations in the cohorts that received 12 mcg and 18 mcg flat dose achieved a complete remission (CR) as their best overall response. Maximum tolerated dose (MTD) was not reached in this study and 18 mcg is now being tested in a multi-center, multi-cohort expansion trial evaluating a total of 90 patients with AML.

The most common APVO436-related AEs were infusion-related reactions (IRR) occurring in thirteen (28.3%) patients and cytokine release syndrome (CRS) occurring in ten (21.7%). No hematologic DLT was observed in any of the ten dose cohorts. Ten patients experienced twelve episodes of Grade 3 febrile neutropenia and each one of these twelve episodes was reported as not related to APVO436. APVO436-related transient neurotoxicity occurred in five of forty-six patients (10.9%). It was mild with Grade 1 AEs including headache, tremor, dizziness, lethargy, insomnia, memory loss, and confusion. A single case of Grade 3 confusion was encountered on the first day of treatment and resolved within a day. APVO436-associated CRS was generally manageable with standard of care and in most cases it resolved rapidly with the administration of tocilizumab at standard doses combined with dexamethasone. APVO436-related CRS was not required for clinically meaningful responses in R/R AML patients, and it did not affect their survival outcome. Notably patients who developed CRS after APVO436 therapy were not more or less likely to have a favorable response. Among eight AML patients with favorable responses, four experienced a CRS and four did not. APVO436-related CRS was not required for clinically meaningful responses in R/R AML patients, and it did not affect the survival outcome. Prolonged stabilization of disease, partial remissions and complete remissions were achieved in both patients who experienced CRS as well as patients who did not experience CRS after APVO436 infusions. In addition, 3 of 6 evaluable MDS patients developed a marrow CR.

A potential complication associated with treatment using bispecific, T-cell engaging antibodies is a systemic inflammatory syndrome known as Cytokine Release Syndrome. CRS may occur within minutes to hours after infusion of the bispecific T-cell engaging antibody or emerge as a delayed onset complication after several days. Clinical manifestations of CRS may range from mild to severe including hypotension, hypoxia, and uncontrolled systemic inflammatory response with circulatory collapse, vascular leakage, peripheral and/or pulmonary edema, renal failure, cardiac dysfunction, and fatal multiorgan system failure. Heart failure can also be a consequence of the systemic inflammatory syndrome of CRS. Another form of systemic inflammation a bispecific T-cell engaging antibody can cause is Hemophagocytic Lymphohistiocytosis (HLH)/Macrophage Activation Syndrome (MAS) which shares many clinical and laboratory features with CRS. HLH/MAS is considered a form of CRS when it occurs after treatment with a bispecific T-cell engaging antibody.

CRS have occurred in some APVO436 patients, which have been effectively treated using the generally recommended standard CRS treatment, which includes the use of tocilizumab and dexamethasone, combined with standard supportive care. This has been confirmed to be effective in the APVO436 patients that have experienced CRS. Several additional treatments for CRS have recently become available, and we are working with key opinion leaders and site investigators to further optimize our algorithm for addressing CRS.

On November 26, 2019, the FDA granted Orphan Drug Designation for AML to APVO436, which grants us exclusive marketing and development rights, as well as eligibility for market exclusivity upon FDA approval of APVO436.

ALG.APV-527. a novel investigational bispecific ADAPTIR candidate, developed in partnership with Alligator Bioscience AB (Alligator), featuring a novel mechanism of action designed to simultaneously target 4-1BB (CD137) and 5T4, a tumor antigen overexpressed in a number of different types of cancer. 4-1BB, a costimulatory receptor on T cells, is known to enhance the immune response to cancer through activation of tumor-specific T cells and is believed to be a promising target for new immunotherapeutic approaches. ALG.APV-527 could potentially have utility in the treatment of a broad spectrum of cancers over-expressing the 5T4 tumor antigen, including mesothelioma, non-small-cell-lung, head and neck, pancreatic, renal, ovarian, prostate, breast, cervical, colorectal, endometrial, and bladder cancers. Aptevo and Alligator plan to file an IND with the FDA in the US in 2022 and to subsequently commence first in human study in the second half of 2022.

APVO603.a preclinical dual agonist bispecific ADAPTIR candidate employing a novel mechanism of action to simultaneously target 4-1BB (CD137) and OX40 (CD134), both members of the TNF-receptor family. Dual targeting of 4-1BB and OX40 provides synergistic co-stimulation of T cells with the potential to amplify the cytotoxic function of activated T cells and NK cells, potentially leading to more robust anti-tumor responses. APVO603’s combined activation of both the 4-1BB and OX40 TNF receptors represents an attractive approach in potentially overcoming the immunosuppressive tumor microenvironment. The targeted co-stimulation of 4-1BB and OX40 has the potential to promote an important immunological cascade, enhancing T-cell activation, prolonging T-cell survival, and improving tumor killing. This product candidate is not dependent on any one tumor antigen and has the potential to treat multiple solid tumors.

APVO442. a novel bispecific candidate based on the ADAPTIR-FLEX platform technology that binds to PSMA with two identical binding domains to PSMA and with one binding domain to CD3 with reduced binding affinity. This candidate was designed to increase biodistribution of drugs to PSMA positive tumors for treatment of prostate cancer. The low-affinity single binding domain to CD3 has the potential to allow for increased concentrations at the tumor due to possibly reducing absorption of the drug by circulating peripheral T cells. Preclinical studies have been completed demonstrating in vitro RTCC that is directed to PSMA bearing tumor cell lines in vitro and in vivo animal models.

Competition

We face, and will continue to face, intense competition from both U.S.-based and foreign producers of both large and small molecule immunotherapeutic products, some of which have lower cost structures, greater access to capital, greater resources for research and development, and sophisticated marketing capabilities. Any product candidate that we successfully develop and commercialize is likely to compete with currently marketed products, as well as other novel product candidates that are in development for the same indications.

APVO436:We anticipate that APVO436 would compete with other agents targeting CD123 that are in development if they are also approved. Bispecifics in development targeting CD123 include: flotetuzumab (formerly MGD006, Macrogenics), and JNJ-63709178 (Janssen). There are numerous CAR-T therapies in development: CART123 (University of Penn.), CARTCD123 (NCI/City of Hope), UCART123 (Cellectis), MB-102 (Mustang Bio) and several others in development in China. Other competitive products targeting CD123 are: tagraxofusp (formerly SL-401, an antibody immunotoxin, Stemline), KHK2833 (monoclonal antibody, Kyowa Hakko Kirin Pharma), CSL362 (monoclonal antibody, CSL/Janssen) and IMGN632 (ImmunoGen and Jazz Pharmaceuticals).

ALG.APV-527:This asset targets 4-1BB in a bispecific format when cross-linked with the tumor antigen 5T4. We anticipate that ALG.APV-527 would compete with bispecifics targeting 5T4 and 4-1BB, which are currently in preclinical development (Crescendo Biologics). Bispecific in the clinic targeting 5T4 include GenMab and Abbvie’s (GEN1044), a 5T4 x CD3 DuoBody, in Phase 1/2 trials. In addition, other competitors include bispecifics targeting 4-1BB in combination with other targets such as 4-1BB x FAP (FAP is expressed on tumor associated stomal fibroblasts). 4-1BB x FAP iscurrently in phase 1 clinical development by Molecular Partners and Amgen (AMG506) and Hoffmann-La Roche (RO7122290) for treatment of advanced solid tumors. Another bispecific targets 4-1BB x HER (Cinrebafusp Alfa, PRS343) which is in phase 2 clinical development by Pieris for treatment of HER2+ solid tumors.

Furthermore, we face significant competition in the oncology market in general, including from: AbbVie Inc., ABL Bio, Aduro, Inc., Affirmed, Amgen Inc., AnaptysBio, Inc., Astellas Pharma Inc., Bayer AG, Bicycle Therapeutics, Biogen Idec Inc., Boehringer Ingelheim GmbH, F-Star Biotechnology Ltd., Genentech Inc. (a subsidiary of F. Hoffmann-La Roche Ltd.), Genmab A/S, GlaxoSmithKline plc, Grifols USA LLC, Bristol Myers Squibb, I-Mab Biopharma, ImmunoGen, Inc., Immunomedics, Inc., Janssen BioTech Inc., Johnson & Johnson, Macrogenics, Inc., Novartis International AG, Pieris Pharmaceuticals, Inc., Sanofi-Aventis US LLC, Takeda Pharmaceuticals U.S.A., Inc., Xencor, Inc. and Zymeworks Biopharmaceuticals, Inc. Additionally, there may be other potential competitors or companies developing competitive products that may not be known to us at this time.

COLLABORATIONS WITH ALLIGATOR BIOSCIENCE

On July 20, 2017, our wholly owned subsidiary Aptevo Research and Development LLC (Aptevo R&D), entered into a collaboration and option agreement (the Collaboration Agreement) with Alligator Bioscience AB, (Alligator), pursuant to which Aptevo R&D and Alligator are collaboratively developing ALG.APV-527, a lead bispecific antibody candidate simultaneously targeting 4-1BB (CD137), a member of the TNFR superfamily of a costimulatory receptor found on activated T-cells, and 5T4 a tumor antigen overexpressed in a number of different types of cancer. This product candidate is built on our novel ADAPTIR platform.

Subject to certain exceptions for Aptevo R&D’s manufacturing and platform technologies, the parties will jointly own intellectual property generated in the performance of the development activities under the Collaboration Agreement. Under the terms of the Collaboration Agreement, the parties intend to share revenue received from a third-party commercialization partner equally, or, if the development costs are not equally shared under the Collaboration Agreement, in proportion to the development costs borne by each party.

The Collaboration Agreement also contains several points in development at which either party may elect to “opt-out” (i.e., terminate without cause) and, following a termination notice period, cease paying development costs for this product candidate, which would be borne fully by the continuing party. Following an opt-out by a party, the continuing party will be granted exclusive rights to continue the development and commercialization of this product candidate, subject to a requirement to pay a percentage of revenue received from any future commercialization partner for this product, or, if the continuing party elects to self-commercialize, tiered royalties on the net sales of this product by the continuing party ranging from the low to mid-single digits, based on the point in development at which the opt-out occurs. The parties have also agreed on certain technical criteria or “stage gates” related to the development of this product that, if not met, will cause an automatic termination and wind-down of the Collaboration Agreement and the activities thereunder, provided that the parties do not agree to continue.

The Collaboration Agreement contains industry standard termination rights, including for material breach following a specified cure period, and in the case of a party’s insolvency.

INTELLECTUAL PROPERTY

We rely on a combination of patents, trademarks, trade secrets, and nondisclosure and non-competition agreements to protect our proprietary intellectual property and will continue to do so. We own or exclusively license the patents and patent applications in our patent portfolio that support the ADAPTIR-FLEX platform, ADAPTIR platform and pipeline products with the exception of certain cell line rights and other research tools, which we license on a non-exclusive basis. We practice patent life cycle management by filing patent applications to protect new inventions relating to meaningful improvements to our products and related methods. We primarily seek patent protection for inventions that support our products and product candidates, but from time to time, we may seek patent protection for inventions that could, for instance, support a potential business opportunity or block a competitor from designing around our existing patents.

In general, and where possible, we pursue patent protection in countries where we believe there will be a significant market for the corresponding product or product candidate. We generally do not seek patent protection in countries where we have reason to believe we would not be able to enforce patents. For instance, we tend to not file in countries that are frequently listed on the Priority Watch List of the Special 301 Report prepared by the Office of the United States Trade Representative, with the exception that we typically file patent applications in China, Russia and India. We may also decide to take a narrower filing approach for secondary and improvement type inventions as compared to inventions that are more foundational to our products. We do not seek patent protection in countries that are on the United Nations, or U.N., list of Least Developed Countries.

The term of protection for various patents associated with, and expected to be associated with, our marketed product and product candidates is typically twenty years from the filing date, but may vary depending on a variety of factors, including the date of filing of the patent application or the date of patent issuance and the legal term of patents in the countries in which they are obtained. The protection afforded by a patent varies on a product-by-product basis and country-to-country basis and depends upon many factors, including the type of patent, the scope of its coverage, the availability of regulatory-related extensions, the necessity for terminal disclaimers, the availability of legal remedies in a particular country, and the validity and enforceability of the patents.

In some cases, we may decide that the best way to protect our intellectual property is to retain proprietary information as trade secrets and confidential information, rather than to apply for patents, which would involve disclosure of proprietary information to the public. When determining whether to protect intellectual property as a trade secret, we consider many factors including, for instance, our ability to maintain the trade secret, the likelihood that a competitor will independently develop the information, our ability to patent protect the intellectual property and the likelihood we would be able to enforce a resulting patent.

We are a party to a number of license agreements under which we license patents, patent applications, and other intellectual property. These agreements impose various commercial diligence and financial payment obligations on us. We expect to continue to enter into these types of license agreements in the future.

ADAPTIR and ADAPTIR-FLEX Platforms. We protect the ADAPTIR platform technology through a combination of patents and trade secrets. We own all ADAPTIR and ADAPTIR-FLEX platform intellectual property, with the exception that we have licenses to certain intellectual property related to third party research tools that we use in conjunction with our ADAPTIR platform technology such as cell lines, vectors, expression systems, and transgenic rodents. For instance, we have a non-exclusive commercial license and research license with Lonza Group AG (Lonza) related to its CHO cell lines and vectors. Under our Lonza research license, we have an option to take a license to use the GS System to develop and manufacture therapeutic proteins for our commercial purposes. We also have a non-exclusive license to certain transgenic rodents of Open Monoclonal Technology, Inc.’s OmniAb platform.

The initial version of the ADAPTIR platform technology was originally developed by Trubion Pharmaceuticals, Inc. (Trubion) prior to its acquisition by Emergent BioSolutions Inc (Emergent). A patent family supporting use of unique linkers in the homodimer (a molecule consisting of two identical halves) version of the ADAPTIR platform was invented jointly by Trubion and Wyeth Pharmaceuticals, Inc. (Wyeth) as part of a collaboration between the two companies. Wyeth assigned the rights it had in that platform patent family to Trubion. We subsequently received the rights to the platform patent family upon our spinoff from Emergent.

In order to differentiate our platform inventions from antibodies and other antibody-like constructs that have been publicly disclosed, many of our patents and patent applications are directed to unique aspects or components of our platform such as linkers, targets, or binding domains.

We have patents relating to the ADAPTIR platform issued in the United States, Australia, Israel, Japan, South Korea, Mexico, Malaysia, New Zealand, Philippines, Russia, Singapore, South Africa, and Vietnam. We also have applications pending in various territories including Europe and Brazil. We plan to continue to improve our ADAPTIR platform and to file patent applications on those improvements. Our decision as to where to file any new ADAPTIR improvement inventions will be based in part on the significance of the improvement. If patents issue on the pending ADAPTIR patent applications, the patent term for those patents are estimated to expire between 2027 and 2036. As our ADAPTIR platform technology evolves, we may decide to allow patent applications and patents to expire if they contain claims that are limited to aspects of the platform that are no longer of value to Aptevo.

ADAPTIR-FLEX, our heterodimer platform, is covered by patent application under the Patent Cooperation Treaty (PCT) that we filed in 2021. The PCT patent application allows us to file patent applications in PCT member state countries including, for instance, the United States, Europe, Japan, China, Australia, and Canada. If patents claiming priority to the pending ADAPTIR-FLEX patent application are issued, the resulting patents are estimated to expire in 2041.

We own patent families directed to use of particular binding domains in the ADAPTIR and ADAPTIR-FLEX platforms. For instance, we have some patents that cover the use of an ADAPTIR therapeutic to target CD3. We also have pending patent applications that cover ADAPTIR therapeutics containing our preferred humanized CD3 binding domain polypeptide sequences.

APVO436. We nationalized our core patent family, which covers the APVO436 product candidate in various countries and territories including the U.S., Australia, Brazil, Canada, China, Colombia, Europe, Eurasia, India, Indonesia, Israel, Japan, Malaysia, Mexico, New Zealand, Philippines, Singapore, South Africa, South Korea, Ukraine, and Vietnam.

ALG.APV-527. We co-own with Alligator a patent family corresponding to PCT application PCT/EP2018/069850, which covers the ALG.APV-527 product candidate. In January and February of 2020, this patent family was nationalized in various countries. Aptevo and Alligator also co-own U.S. patent 10,239,949, which relates to protein molecules that specifically bind to 5T4 and/or 4-1BB.

In addition to the co-owned assets, Alligator owns a patent family corresponding to PCT application PCT/EP2017/059656, which also covers ALG.APV-527. Aptevo has an exclusive license from Alligator to this patent family for the development of the ALG.APV-527 product candidate.

Preclinical Therapeutic Candidates. We routinely file United States provisional patent applications and/or Patent Cooperation Treaty (PCT) patent applications on our preclinical therapeutic assets when we believe we have sufficient data to support a patent application filing. Aptevo owns pending patent applications, for instance, which support its APVO603 and APVO442 therapeutic candidates.

Trademarks owned by Aptevo Therapeutics Inc. and its subsidiaries. Where possible, we pursue registered trademarks for our marketed products in significant markets. We own trademark registrations and pending applications for the marks: APTEVO THERAPEUTICS, APTEVO BIOTHERAPEUTICS, APTEVO RESEARCH AND DEVELOPMENT, the Aptevo logo, ADAPTIR, and ADAPTIR-FLEX in relevant jurisdictions.

REGULATION

Regulations in the United States and other countries have a significant impact on our product development, manufacturing, and marketing activities. Government authorities in the United States, at the federal, state, and local level, and in other countries, extensively regulate, among other things, the research, development, testing, approval, manufacture, packaging, storage, recordkeeping, labeling, advertising, promotion, distribution, marketing, import, and export of biopharmaceutical products. In addition, sponsors of biopharmaceutical products participating in Medicaid and Medicare are required to comply with mandatory price reporting, discount, and rebate requirements. The processes for obtaining regulatory approvals in the United States and in foreign countries, along with compliance with applicable statutes and regulations, require the expenditure of substantial time and financial

resources. In the United States, the FDA regulates biopharmaceutical products under the Federal Food, Drug, and Cosmetic Act, or FDCA, the Public Health Services Act, or PHSA, and their implementing regulations.FDA’s requirements and expectations with respect to product development are constantly evolving.By example, in light of the ongoing COVID-19 pandemic, the FDA issued a number of guidance documents to assist companies navigating COVID-19, product development, and manufacturing.

Product Development for Therapeutics

Preclinical Testing. Before beginning testing of any compounds with potential therapeutic value in human subjects in the United States, stringent government requirements for preclinical data must be satisfied. Preclinical testing includes both in vitro, or in an artificial environment outside of a living organism, and in vivo, or within a living organism, laboratory evaluation and characterization of the safety and efficacy of a drug and its formulation, as well as its chemistry, pharmacology, and toxicity. We perform preclinical testing on all of our product candidates before we initiate any human trials.

Investigational New Drug Application. Before clinical testing may begin, the results of preclinical testing, together with manufacturing information, analytical data and any other available clinical data or literature, must be submitted to the United States Food and Drug Administration, or FDA, as part of an Investigational New Drug Application, or IND. The sponsor must also include an initial protocol detailing the first phase of the proposed clinical investigation, together with information regarding the qualifications of the clinical investigators. The provided data must provide an adequate basis for evaluating both the safety and the scientific rationale for the initial clinical studies in human volunteers. The IND automatically becomes effective 30 days after receipt by the FDA unless the FDA imposes a clinical hold within that 30-day time period. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. Clinical holds also may be imposed by the FDA at any time before or during trials due to safety concerns or non-compliance. As a result, submission of an IND may not result in FDA authorization to commence a clinical trial.

Clinical Trials. Clinical trials involve the administration of the drug to healthy human volunteers, or to patients with the target disease or disorder under the supervision of a qualified physician (also called an investigator) pursuant to an FDA-reviewed protocol. Human clinical trials typically are conducted in three sequential phases, although the phases may overlap with one another. Clinical trials must be conducted under protocols that detail the objectives of the study, the parameters to be used to monitor safety and the efficacy criteria, if any, to be evaluated. Each protocol, and any subsequent amendments, must be submitted to the FDA, as part of the IND, or comparable foreign regulatory authorities.

Additional kinds of data may also help to support a BLA or product development, such as patient experience and real world evidence. For appropriate indications sought through supplemental BLAs, data summaries may provide marketing application support. For genetically targeted products and variant protein targeted products intended to address an unmet medical need in one or more patient subgroups with a serious or life threatening rare disease or condition, the FDA may allow a sponsor to rely upon data and information previously developed by the sponsor or for which the sponsor has a right of reference, that was submitted previously to support an approved application for a product that incorporates or utilizes the same or similar genetically targeted technology or a product that is the same or utilizes the same variant protein targeted drug as the product that is the subject of the application.

In addition, under the Pediatric Research Equity Act of 2003, or PREA, BLAs and supplements for a new active ingredient, indication, dosage form, dosage regimen, or route of administration must contain data to assess the safety and efficacy of the product for the claimed indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. The FDA may grant deferrals for submission of data or full or partial waivers. Unless otherwise required by regulation, PREA does not apply to any drug or biologic for an indication for which orphan designation has been granted for the relevant indication.

Good Clinical Practice. All of the phases of clinical studies must be conducted in conformance with the FDA’s Good Clinical Practices (GCPs) or equivalent standards from comparable foreign regulatory authorities, which are ethical and scientific quality standards for conducting, recording and reporting clinical trials to assure that the data and reported results are credible and accurate and that the rights, safety and well-being of trial participants are protected. GCPs include requirements that all research subjects provide their informed consent in writing for their participation in any clinical trial. Investigators must also provide certain information to the clinical trial sponsors to allow the sponsors to make certain financial disclosures to the FDA. In addition, an Institutional Review Board, or IRB, at each study site participating in the clinical trial or a central IRB must review and approve the plan for any clinical trial, informed consent forms, and communications to study subjects before a study commences at that site. An IRB considers, among other things, whether the risks to individuals participating in the trials are minimized and are reasonable in relation to anticipated benefits, and whether the planned human subject protections are adequate. The IRB must continue to oversee the clinical trial while it is being conducted. Once an IND is in effect, each new clinical protocol and any amendments to the protocol must be submitted to FDA for review, and to the IRB for approval. If a product candidate is being investigated for multiple intended indications, separate INDs may also be required. Progress reports detailing the results of the clinical trials must also be submitted at least annually to the FDA and the IRB and more frequently if serious adverse events or other significant safety information is found.

Information about certain clinical trials, including a description of the study and study results, must be submitted within specific timeframes to the National Institutes of Health, or NIH, for public dissemination on their clinicaltrials.gov website. Sponsors or distributors of investigational products for the diagnosis, monitoring, or treatment of one or more serious diseases or conditions must also have a publicly available policy on evaluating and responding to requests for expanded access requests.

The manufacture of investigational biologics for the conduct of human clinical trials is subject to FDA’s current Good Manufacturing Practice, or cGMP requirements. Investigational biologics and therapeutic substances imported into the United States are also subject to regulation by the FDA. Further, the export of investigational products outside of the United States is subject to regulatory requirements of the receiving country as well as U.S. export requirements under the FDCA.

Concurrent with clinical trials, companies usually complete additional animal studies and must also develop additional information about the chemistry and physical characteristics of the product candidate as well as finalize a process for manufacturing the product in commercial quantities in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of the product candidate and, among other things, manufacturers must develop methods for testing the identity, strength, quality, potency, and purity of the final product. Additionally, appropriate packaging must be selected and tested, and stability studies must be conducted to demonstrate that the product candidate does not undergo unacceptable deterioration over its shelf life.

The FDA may order the temporary, or permanent, discontinuation of a clinical trial at any time, or impose other sanctions, if it believes that the clinical trial either is not being conducted in accordance with FDA requirements or presents an unacceptable risk to the clinical trial patients. An IRB may also require the clinical trial at the site to be halted, either temporarily or permanently, for failure to comply with the IRB’s requirements or if the trial poses an unexpected serious harm to subjects. The FDA or an IRB may also impose conditions on the conduct of a clinical trial. Clinical trial sponsors may also choose to discontinue clinical trials as a result of risks to subjects, a lack of favorable results, or changing business priorities.

Marketing Approval - Biologics

Biologics License Application. All data obtained from a comprehensive development program, including research and product development, manufacturing, preclinical and clinical trials, labeling and related information are submitted in a biologics license application, or BLA, to the FDA and in similar regulatory filings with the corresponding agencies in other countries for review and approval. In most cases, the submission of a marketing application is subject to a substantial application user fee. These user fees must be paid at the time of the first submission of the application, even if the application is being submitted on a rolling basis. Fee waivers or reductions are available in certain circumstances. By example, product candidates that are designated as orphan products, which are further described below, are not subject to application user fees unless the application includes an indication other than the orphan indication.

The submission of an application is not a guarantee that the FDA will find the application complete and accept it for filing. The FDA may refuse to file the application and request additional information rather than accept the application for filing, in which case the application must be resubmitted with the supplemental information. The resubmitted application is also subject to review before the FDA accepts it for filing. The FDA has two months to review an application for its acceptability for filing.

Once an application is accepted for filing, the FDA begins an in-depth substantive review. The Prescription Drug User Fee Act, or PDUFA, establishes a two-tiered review system: Standard Review and Priority Review. When conducting Priority Review, the FDA has a goal to review and act on BLA submissions within six months from the date of the FDA’s acceptance for filing of the application, rather than the ten-month goal under a Standard Review. The FDA gives Priority Review status to product candidates that provide safe and effective therapies where no satisfactory alternative exists or to a product candidate that are intended to treat serious conditions and, if approved, would provide significant improvements in the safety or effectiveness of the treatment, diagnosis, or prevention of the serious condition. The PDUFA date is only a goal, thus, the FDA does not always meet its PDUFA dates. The review process and the PDUFA date may also be extended if the FDA requests or the sponsor otherwise provides substantial additional information or clarification regarding the submission.

The FDA may refer certain applications to an advisory committee. Before approving a product candidate for which no active ingredient (including any ester or salt of active ingredients) has previously been approved by the FDA, the FDA must either refer that product candidate to an external advisory committee or provide in an action letter, a summary of the reasons why the FDA did not refer the product candidate to an advisory committee. The FDA may also refer other product candidates to an advisory committee if FDA believes that the advisory committee’s expertise would be beneficial. An advisory committee is typically a panel that includes clinicians and other experts, which review, evaluate, and make a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making decisions.

The FDA reviews applications to determine, among other things, whether a product candidate meets the agency’s approval standards and whether the manufacturing methods and controls are adequate to assure and preserve the product’s identity, strength, quality, potency, and purity. Before approving a marketing application, the FDA typically will inspect the facility or facilities where the product is manufactured, referred to as a Pre-Approval Inspection. The FDA will not approve an application unless it determines that the manufacturing processes and facilities, including contract manufacturers and subcontractors, are in compliance with cGMP requirements and adequate to assure consistent production of the product within required specifications. Additionally, before approving a marketing application the FDA will inspect one or more clinical trial sites to assure compliance with GCPs.

In reviewing a BLA, the FDA may grant approval or deny the application through a complete response letter, or CRL, if it determines the application does not provide an adequate basis for approval requesting additional information. A CRL indicates that the review cycle of the application is complete and the application is not ready for approval and describes all of the specific deficiencies that the FDA identified. A CRL generally contains a statement of specific conditions that must be met in order to secure final approval of the marketing application, and may require additional clinical or preclinical testing in order for the FDA to reconsider the application. The deficiencies identified may be minor, for example, requiring labeling changes; or major, for example, requiring additional clinical trials. If a CRL is issued, the applicant may either: resubmit the marketing application, addressing all of the deficiencies identified in the letter; withdraw the application; or request an opportunity for a hearing. Even if additional information outlined in a CRL is submitted, the FDA may ultimately decide that the BLA does not satisfy the criteria for approval.

The receipt of regulatory approval often takes many years, involving the expenditure of substantial financial resources. The speed with which approval is granted often depends on a number of factors, including the severity of the disease in question, the availability of alternative treatments and the risks and benefits demonstrated in clinical trials. The FDA may also impose conditions upon approval. For example, it may require a Risk Evaluation and Mitigation Strategy, or REMS, for a product. This can include various required elements, such as publication of a medication guide, patient package insert, a communication plan to educate health care providers of the drug’s risks and/or restrictions on distribution and use, such as limitations on who may prescribe or dispense the drug. Following product approval, a REMS may also be required by the FDA if new safety information is discovered and the FDA determines that a REMS is necessary to ensure that the benefits of the product outweigh the risks.

The FDA may also significantly limit the indications or populations approved for a given product, require that contraindications, warnings, or precautions be included in the product labeling, including a boxed warning, and/or require, as a condition of approval, enhanced labeling, special packaging or labeling, post-approval clinical trials, distribution or other risk management mechanisms, expedited reporting of certain adverse events, pre-approval of promotional materials or restrictions on direct-to-consumer advertising, any of which could negatively impact the commercial success of a drug. The FDA may also not approve label statements that are necessary for successful commercialization and marketing.

After approval, some types of changes to the approved product, such as adding new indications, manufacturing changes, and additional labeling claims, are subject to further testing requirements and FDA review and approval. The FDA may also withdraw the product approval if compliance with the pre- and post-marketing regulatory standards are not maintained or if problems occur after the product reaches the marketplace. Further, should new safety information arise, additional testing, product labeling, or FDA notification may be required.

Breakthrough Therapy. Under the provisions of the Food and Drug Administration Safety and Innovation Act, or FDASIA, the FDA may designate a product as a breakthrough therapy if the product is intended, alone or in combination with one or more other products, to treat a serious or life-threatening disease or condition, and preliminary clinical evidence indicates that the product may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. Products designated as breakthrough therapies are also eligible for accelerated approval. The FDA must take certain actions, such as holding timely meetings and providing advice, intended to expedite the development and review of an application for approval of a breakthrough therapy.

Orphan Drugs. Under the Orphan Drug Act, an applicant can request the FDA to designate a product as an “orphan drug” in the United States if the drug is intended to treat an orphan, or rare, disease or condition. A disease or condition is considered orphan if it affects fewer than 200,000 people in the United States, or affecting more than 200,000 in the United States and for which there is no reasonable expectation that the cost of developing and making the product available in the United States will be recovered from United States sales. Additionally, sponsors must present a plausible hypothesis for clinical superiority to obtain orphan drug designation if there is a product already approved by the FDA that that is considered by the FDA to be the same as the already approved product and is intended for the same indication. This hypothesis must be demonstrated to obtain orphan exclusivity. Orphan drug designation must be requested before submitting a BLA. Products designated as orphan drugs are eligible for special grant funding for research and development, potential tax credits for research, waived user fees for marketing applications and a seven-year period of market exclusivity after marketing approval. The tax advantages, however, were limited in the 2017 Tax Cuts and Jobs Act.

Orphan drug exclusivity (afforded to the first applicant to receive approval for an orphan designated drug) prevents FDA approval of applications by others for the same drug for the designated orphan disease or condition. The FDA may approve a subsequent application from another applicant if the FDA determines that the application is for a different drug or different use, or if the FDA determines that the subsequent product is clinically superior, or that the holder of the initial orphan drug approval cannot assure the availability of sufficient quantities of the drug to meet the public’s need. A grant of an orphan designation is not a guarantee that a product will be approved. On November 26, 2019 FDA granted Orphan Drug Designation to APVO436, a bispecific antibody candidate intended for the treatment of acute myelogenous leukemia (AML). APVO436 is currently being evaluated in a Phase 1b clinical trial in patients with AML and myelodysplastic syndrome (MDS).

Post-Approval Requirements. Any biologic for which we receive FDA approval will be subject to continuing regulation by the FDA, including, among other things, record keeping requirements, reporting of adverse experiences, reporting of deviations and shortages, providing the FDA with updated safety and efficacy information, product sampling and distribution requirements, current good manufacturing practices, or cGMP, and restrictions on advertising and promotion. Adverse events that are reported after marketing approval can result in additional limitations being placed on the product’s distribution or use and, potentially, withdrawal or suspension of the product from the market. In addition, the FDA authority to require post-approval clinical trials and/or safety labeling changes if warranted. In certain circumstances, the FDA may impose a REMS after a product has been approved.

Facilities involved in the manufacture and distribution of approved products are required to register their establishments with the FDA and certain state agencies, list their manufactured products, and are subject to periodic unannounced inspections by the FDA for compliance with cGMP and other laws. Manufacturers and other parties involved in the supply chain for prescription drug products must also comply with product tracking and tracing requirements and for notifying the FDA of counterfeit, diverted, stolen and intentionally adulterated products or products that are otherwise unfit for distribution in the United States. Recently, the information that must be submitted to FDA regarding manufactured products was expanded through the Coronavirus Aid, Relief, and Economic Security, or CARES, Act to include the volume of drugs produced during the prior year. Manufacturers must continue to expend time, money, and effort in the areas of production and quality-control to maintain compliance with cGMPs. Regulatory authorities may withdraw product approvals, require label modifications, or request product recalls, among other actions, if a company fails to comply with regulatory standards, if it encounters problems following initial marketing, or if previously unrecognized problems are subsequently discovered.

The FDA also closely monitors advertising and promotional materials we may disseminate for our products for compliance with restrictions on off-label promotion and other laws. We may not promote our products for conditions of use that are not included in the approved package inserts for our products. Physicians, in their independent professional medical judgment, however, may prescribe legally available products for unapproved indications that are not described in the product’s labeling and that differ from those tested and approved by the FDA. Certain additional restrictions on advertising and promotion exist for products that have boxed warnings in their approved package inserts. The FDA and other agencies actively enforce the laws and regulations prohibiting the promotion of off-label uses, and a company that is found to have improperly promoted off-label uses may be subject to significant liability, including, but not limited to, criminal and civil penalties under the FDCA and False Claims Act, exclusion from participation in federal healthcare programs, mandatory compliance programs under corporate integrity agreements, suspension and debarment from government contracts, and refusal of orders under existing government contracts.

Biosimilars and Exclusivity. The Biologics Price Competition and Innovation Act of 2009, or BPCIA, creates an abbreviated approval pathway for biological products shown to be highly similar to or interchangeable with an FDA-licensed reference biological product. Biosimilarity sufficient to reference a prior FDA-approved product requires a high similarity to the reference product notwithstanding minor differences in clinically inactive components, and no clinically meaningful differences between the biological product and the reference product in terms of safety, purity, and potency. Biosimilarity must be shown through analytical studies, animal studies, and at least one clinical trial, absent a waiver by the FDA. There must be no difference between the reference product and a biosimilar in mechanism of action, conditions of use, route of administration, dosage form, and strength. A biosimilar product may bedeemed interchangeable with a prior approved product if it meets the higher hurdle of demonstrating that it can be expected to produce the same clinical results as the reference product and, for products administered multiple times, the biologic and the reference biologic may be switched after one has been previously administered without increasing safety risks or risks of diminished efficacy relative to exclusive use of the reference biologic.

A reference biologic is granted 12 years of exclusivity from the time of first licensure, and no application for a biosimilar can be submitted for four years from the date of licensure. However, certain changes and supplements to an approved BLA, and subsequent applications filed by the same sponsor, manufacturer, licensor, predecessor in interest, or other related entity do not qualify for the twelve-year exclusivity period. The PHSA also includes provisions to protect reference products that have patent protection. The biosimilar product sponsor and reference product sponsor may exchange certain patent and product information for the purpose of determining whether there should be a legal patent challenge. Based on the outcome of negotiations surrounding the exchanged information, the reference product sponsor may bring a patent infringement suit and injunction proceedings against the biosimilar product sponsor. The biosimilar applicant may also be able to bring an action for declaratory judgment concerning the patent.

In an effort to increase competition in the biologic product marketplace, Congress, the executive branch, and FDA have taken certain legislative and regulatory steps. For example, in 2020, FDA finalized a guidance to facilitate drug and biologic product importation. Moreover, the 2020 Further Consolidated Appropriations Act included provisions requiring that sponsors of approved biologic products, including those subject to REMS, provide samples of the approved products to persons developing biosimilar products within specified timeframes, in sufficient quantities, and on commercially reasonable market-based terms. Failure to do so can subject the approved product sponsor to civil actions, penalties, and responsibility for attorney’s fees and costs of the civil action. This same bill also includes provisions with respect to shared and separate REMS programs for reference and generic drug products.

Patent Term Restoration. If approved, biologic products may also be eligible for periods of U.S. patent term restoration. If granted, patent term restoration extends the patent life of a single unexpired patent, that has not previously been extended, for a maximum of five years. The total patent life of the product with the extension also cannot exceed fourteen years from the product’ approval date. Subject to the prior limitations, the period of the extension is calculated by adding half of the time from the effective date of an IND to the initial submission of a marketing application, and all of the time between the submission of the marketing application and its approval. This period may also be reduced by any time that the applicant did not act with due diligence.

Regulation in the European Union. Product development, the regulatory approval process and safety monitoring of medicinal products and their manufacturers in the European Union proceed broadly in the same way as they do in the United States. Therefore, many of the issues discussed above apply similarly in the context of the European Union. In addition, drugs are subject to the extensive price and reimbursement regulations of the various EU member states. The Clinical Trial Regulation EU 536/2014 (“CTR”) repealed the Clinical Trials Directive 2001/20/EC, as amended (“CTD”) on January 31, 2022, subject to a three-year transition period. The CTR makes it possible within the EU for sponsors to submit a single harmonized electronic submission via a single online platform known as the Clinical Trials Information System (“CTIS”) for approval to conduct a clinical trial in several European countries and have a single assessment process for clinical trials conducted in multiple member states. Under the CTR, sponsors can use the CTIS from January 31, 2022 but are not obliged to use it immediately, in line with a three-year transition period. Sponsors may use CTIS to apply to conduct a clinical trial under the CTR or may choose to apply to conduct a trial under the CTD until January 30, 2023. From January 31, 2023, sponsors will need to use CTIS to apply to start a new clinical trial in the EU/EEA. From January 31, 2025, any trials approved under the CTD that continue running will need to comply with the CTR and their sponsors must have recorded information on such trials in CTIS.

Healthcare Fraud and Abuse and Anti-Corruption Laws

Various federal and state laws pertaining to health care “fraud and abuse” exist, including state and federal anti-kickback laws false claims laws, and patent privacy and security laws. Anti-kickback laws make it illegal for a drug manufacturer to knowingly and willfully solicit, offer, receive or pay any remuneration in exchange for, to induce, or in return for, the referral of business that may be reimbursed by a third party payor (including Medicare and Medicaid), including the purchase, prescribing or recommendation of a particular drug. Due to the breadth of the statutory provisions, it is possible that our practices might be challenged under anti-kickback or similar laws. Civil and criminal false claims laws, false statement laws and civil monetary penalty laws prohibit, among other things, anyone from knowingly presenting, or causing to be presented for payment, to third-party payors (including Medicare and Medicaid) claims for reimbursed drugs or services that are false or fraudulent, claims for items or services not provided as claimed or claims for medically unnecessary items or services. Our activities relating to the

sale and marketing of our products may be subject to scrutiny under these laws. Privacy and security laws, such as the Health Insurance Portability and Accountability Act of 1996, or HIPAA, create federal criminal and civil liability for executing a scheme to defraud any healthcare benefit program or knowingly and willfully falsifying, concealing or covering up a material fact or making any materially false statement in connection with the delivery of or payment for healthcare benefits, items or services. Additionally, HIPAA, as amended by the Health Information Technology for Economic and Clinical Health, or HITECH, and their respective implementing regulations, impose certain requirements relating to the privacy, security, and transmission of individually identifiable health information.

In addition, as part of the Affordable Care Act, the federal government enacted the Physician Payment Sunshine Act. Manufacturers of drugs biologics and devices that are reimbursed by Medicare, Medicaid or the Children’s Health Insurance Program are required to annually report to CMS payments and transfers of value made to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors) and teaching hospitals, and ownership or investment interest held by physicians and their family members. Effective January 1, 2022, these reporting obligations extend to include transfers of value made to certain non-physician providers (physician assistants, nurse practitioners, clinical nurse specialists, certified registered nurse anesthetists and anesthesiologist assistants, and certified-nurse midwives).

Our operations are also subject to compliance with the U.S. Foreign Corrupt Practices Act, or FCPA, which prohibits corporations and individuals from directly or indirectly paying, offering to pay, or authorizing the payment of anything of value to any foreign government official or employee, or any foreign political party or political candidate in an attempt to obtain or retain business or to otherwise influence such official, employee, party or candidate in his or her or its official capacity. Our operations are also subject to compliance with the U.K. Bribery Act of 2010, which applies to activities both in the public and private sector, Canada’s Corruption of Foreign Public Officials Act and similar laws and industry codes in other countries where we do business.

Other Regulation

Our present and future business has been and will continue to be subject to various other laws and regulations. Various laws, regulations and recommendations relating to safe working conditions, laboratory practices, the experimental use of animals, and the purchase, storage, movement, import, export, use and disposal of hazardous or potentially hazardous substances, including radioactive compounds and infectious disease agents used in connection with our product development, are or may be applicable to our activities.

HUMAN CAPITAL

Employees and Office Location

Aptevo employed 54 full-time persons as of December 31, 2021. The team is comprised of a dedicated group of accomplished professionals who bring a broad range of academic achievements combined with significant industry experience. We believe that our future success will depend in part on our continued ability to attract, hire and retain qualified personnel. To this end, we strive to maintain competitive base compensation structures and comprehensive benefits packages, and to engage our employees through ongoing development and training. None of our employees are represented by a labor union or covered by collective bargaining agreements. We believe our relationships with our employees are positive.

Our principal executive offices are located at 2401 4th Ave., Suite 1050, Seattle, Washington 98121. Our telephone number is (206) 838-0500.

Corporate Values

Leading by our core values unifies Aptevo and enables every employee to be an agent of positive culture. We believe that our success depends on creating an environment that is personally and professionally rewarding and creating opportunities for personal and professional development. These values, which are the foundation of our Company culture, are:

• Empowerment

• Ownership

• Professionalism

We consider these values to be an integral part of our corporate goal setting and review process. We believe in empowering our employees and consider them as owners of the business. We treat each other with respect and maintain a high level of professionalism and accountability. Our Board of Directors and executive team continues to monitor and focus on our human capital resources to ensure we live by our core values.

Diversity, Equity, and Inclusion

Diversity, equity, and inclusion (DEI) is of great importance to our culture, day-to-day operations, and future success. Aptevo is an equal opportunity employer, and we are committed to fostering DEI within our work environment and beyond. We believe DEI promotes our business growth, drives innovation in the therapeutic product candidates we develop, and in the way we solve problems. Our efforts are focused on hiring and retaining qualified candidates, and promoting a supportive and inclusive working environment for all of our employees. The Company is resolute on its commitment to the development and fair treatment of all candidates and employees, including equal opportunity hiring and advancement practices and policies, and anti-harassment and anti-retaliation policies. We believe that fostering diversity, equity, and inclusion is a key element to discovering, developing, and bringing transformative therapies to patients. As of December 31, 2021, 55% of our workforce and 44% of our leadership (at the Director level and above) were female. In addition, 44% of our workforce and our leadership (at the Director level and above) were racially or ethnically diverse. We strive to build a workforce representative of the people we serve and to nurture an inclusive culture where all voices are welcomed, heard, and respected.

Recruiting and Retention

We invest in resources to recruit, develop, and retain the talent needed to achieve our business goals. We believe in supporting our employees to reach their full potential and strive to promote internally. We have been successful in attracting and retaining talented personnel to support our business, though competition for personnel in our industry is intense.

Compensation and Benefits

Our compensation packages are designed to attract and retain talent, drive Company performance and achieve business goals. In setting appropriate compensation levels, we look at the average base pay rate for each position based on market data. We also offer an annual cash incentive program and long-term equity incentive plans designed to assist in attracting, retaining, and motivating employees and promoting the creation of long-term value for stockholders. Further, all employees are eligible for health insurance and other health benefits, paid and unpaid leaves, retirement benefits with Company match, and life and disability coverage/insurance. We have an unlimited paid time off policy that provides employees with considerable flexibility in scheduling time away from work.

Health & Safety

Employee safety and well-being is of paramount importance to us and was of continued focus in 2021 in light of the COVID-19 global pandemic. The Company adjusted its working environment and operations since the onset of the COVID-19 global pandemic to ensure only essential employees, which mainly include our research and development team, worked onsite, and transitioned all non-essential employees to remote work. We equipped our employees working remotely with necessary equipment and tools to continue to collaborate and remain productive. To ensure health and safely of on-site employees, we provided them with necessary personal protective equipment and implemented new safety procedures, including social distancing while in the office, and wearing masks while on site.

Additionally, we have an Environmental, Health and Safety program that focuses on implementing policies and training programs, as well as performing self-audits to enhance work safety. Importantly, during the COVID-19 pandemic, our continuing focus on safe work practices has enabled us to preserve business continuity without sacrificing our commitment to keeping our colleagues and workplace visitors safe.

ORGANIZATIONAL HISTORY

Aptevo was formed as a wholly-owned subsidiary of Emergent for the purpose of serving as the parent company for the development-based biotechnology business focused on novel oncology, hematology, and autoimmune and inflammatory therapeutics and was incorporated in Delaware in February 2016. On August 1,

2016, Emergent effectuated a spin-off of Aptevo into an independent publicly traded company and made a pro rata distribution of Aptevo common stock to Emergent’s stockholder base at that time. Accordingly, Aptevo has operated as an independent publicly traded company since August 1, 2016.

AVAILABLE INFORMATION

The Aptevo website is located at www.AptevoTherapeutics.com. Aptevo makes certain filings with the Securities and Exchange Commission (the SEC), including its Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and all amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act available free of charge through its website as soon as reasonably practicable after we electronically file those reports with, or furnish them to, the SEC.

In addition, all disclosures that are required to be posted by applicable law, the rules of the SEC or the Nasdaq listing standards regarding any amendment to, or waiver of, our code of business conduct and ethics are available free of charge on our website. We intend to use our website as a means of disclosing material non-public information and for complying with our disclosure obligations under Regulation FD. Accordingly, investors should monitor our website, in addition to following our press releases, investor deck, SEC filings and public conference calls and webcasts. We have included our website address as an inactive textual reference only. The information contained on, or that can be accessed through, our website is not a part of, or incorporated by reference into, this Annual Report on form 10-K.

Item 1A. Risk Factors.

We are subject to significant risks and uncertainties that could impact the Company’s businesses, results of operations and financial condition, including by causing our actual results to differ materially from those projected in any forward-looking statements. Additional risks and uncertainties that are not currently known to the Company or management or that are not currently believed by the Company or management to be material may also harm the Company’s business, financial condition and results of operation. You should carefully consider the following risks and other information in this Annual Report on Form 10-K in evaluating us and our common stock.

RISK FACTOR SUMMARY

The following is a summary of the material risks to our business, operations, and ownership of our common stock:

• We have a history of losses and may not be profitable in the future.

• Our stock price may be volatile.

RISKS RELATED TO OUR BUSINESS

Financial Risks

We have a history of losses and may not be profitable in the future.

We have experienced significant operating losses and we may not achieve profitability in the future. For the years ended December 31, 2021 and 2020, we had net losses of $28.5 million and $17.8 million, respectively. As of December 31, 2021, we had an accumulated deficit of $214.1 million. We expect to continue to incur annual net operating losses for the foreseeable future, and will require substantial resources over the next several years as we expand our efforts to discover, develop and commercialize immunotherapeutic candidates. While we believe our existing cash and cash equivalents and the funding provided by our IXINITY deferred payment streams, the Royalty Purchase Agreement with HCR, Credit Agreement with MidCap Financial (Credit Agreement), our Equity Distribution Agreement with Piper Sandler & Co (Piper Sandler) entered into in December 2020 (the Equity Distribution Agreement) and our Purchase Agreement with Lincoln Park Capital Fund, LLC (Lincoln Park), entered into in February 2022 (the Purchase Agreement), and exercises of warrants will provide us with sufficient liquidity to meet our cash requirements through at least next twelve months, our future success and ability to attain profitability will depend upon our ability to develop and take to market our product candidates.

We will require additional capital and may be unable to raise capital when needed or on acceptable terms.

As of December 31, 2021, we had cash, cash equivalents, and restricted cash in the amount of $46.3 million. We will require additional funding to grow our business including to support the ongoing clinical development of APVO436, develop additional products, support commercial marketing activities, or otherwise provide additional financial flexibility. If we are not able to secure adequate additional funding, we may need to make further reductions in spending. This may include extending payment terms with suppliers, liquidating assets, and suspending or curtailing planned programs. We may also have to further delay, reduce the scope of, suspend or eliminate one or more research and development programs. A failure to raise the additional funding or to effectively implement cost reductions could harm our business, results of operations and future prospects. Our future capital requirements will depend on many factors, including:

• the extent to which we invest in products or technologies;

• capital improvements to our facilities;

• the scope, progress, results, and costs of our development activities;

If our capital resources are insufficient to meet our future capital requirements, we will need to finance our cash needs through bank loans, public or private equity or debt offerings, collaboration and licensing arrangements, or other strategic transactions. Future issuances of common stock may include (i) any sale of up to the remaining $50.0 million worth of shares of our common stock pursuant to our Equity Distribution Agreement with Piper Sandler & Co entered into in December 2020, (ii) any sale of up to $35 million worth of shares of our common stock to issue from our Purchase Agreement with Lincoln Park Capital Fund, LLC, or Lincoln Park, entered into in February 2022, and (iii) the issuance of up to 350,589 remaining outstanding shares of common stock as of December 31, 2021 upon the exercise of warrants issued in connection with our March 2019 public offering of common stock and warrants. Public or bank debt financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures, pursuing acquisition opportunities, or declaring dividends. If we raise funds by issuing equity securities, our stockholders will experience dilution. If we raise funds through collaboration and licensing arrangements with third parties or enter into other strategic transactions, it may be necessary to relinquish valuable rights to our technologies or product candidates or grant licenses on terms that may not be favorable to us.

Current economic conditions, including the impact of COVID-19 on our operations or on the global economy and capital markets, may make it difficult to obtain additional financing on attractive terms, or at all. If financing is unavailable or lost, our business, results of operations, financial condition and financial prospects would be adversely affected and we could be forced to delay, reduce the scope of or eliminate many of our planned activities.

Our business is affected by macroeconomic conditions, including rising inflation, interest rates and supply chain constraints.

Various macroeconomic factors could adversely affect our business and the results of our operations and financial condition, including changes in inflation, interest rates and overall economic conditions and uncertainties such as those resulting from the current and future conditions in the global financial markets. For instance, inflation could negatively impact the Company by increasing our labor costs, through higher wages and higher interest rates. Recent supply chain constraints have led to higher inflation, which if sustained could have a negative impact on the Company's product development and operations. If inflation or other factors were to significantly increase our business costs, our ability to develop our current pipeline and new therapeutic products may be negatively affected. Interest rates, the liquidity of the credit markets and the volatility of the capital markets could also affect the operation of our business and our ability to raise capital in order to fund our operations. Similarly, these macroeconomic factors could affect the ability of our third-party suppliers and manufacturers to manufacture all clinical trial materials for our product candidates.

Actions of activist stockholders against us have been and could be disruptive and costly and may cause uncertainty about the strategic direction of our business.

Stockholders have in the past and may, from time to time, engage in proxy solicitations or advance stockholder proposals, or otherwise attempt to effect changes and assert influence on our board of directors and management. For example, on February 9, 2021, Tang Capital Partners LP, Tang Capital Management, LLC and Kevin Tang (collectively, “Tang”) submitted an advisory stockholder proposal for consideration at our 2021 annual meeting of stockholders to commence a process to sell Aptevo to the highest bidder. Activist campaigns that contest or conflict with our strategic direction or seek changes in the composition of our board of directors or management could have an adverse effect on our operating results and financial condition. A proxy contest would require us to incur significant legal and advisory fees, proxy solicitation expenses and administrative and associated costs and require significant time and attention by our board of directors and management, diverting their attention from the

pursuit of our business strategy. Any perceived uncertainties as to our future direction and control, our ability to execute on our strategy, or changes to the composition of our board of directors or senior management team arising from a proxy contest could lead to the perception of a change in the direction of our business or instability which may result in the loss of potential business opportunities, make it more difficult to pursue our strategic initiatives, or limit our ability to attract and retain qualified personnel and business partners, any of which could adversely affect our business and operating results. If individuals are ultimately elected to our board of directors with a specific agenda, it may adversely affect our ability to effectively implement our business strategy and create additional value for our stockholders. We may choose to initiate, or may become subject to, litigation as a result of the proxy contest or matters arising from the proxy contest, which would serve as a further distraction to our board of directors and management and would require us to incur significant additional costs. In addition, actions such as those described above could cause significant fluctuations in our stock price based upon temporary or speculative market perceptions or other factors that do not necessarily reflect the underlying fundamentals and prospects of our business.

Our future income will depend, in part, on the ability of Medexus to successfully further develop, market and commercialize IXINITY, resulting in milestone payments and deferred payments to the Company by Medexus.

On February 28, 2020, we entered into a Purchase Agreement with Medexus, pursuant to which we sold all of the issued and outstanding limited liability company interests of Aptevo BioTherapeutics, a subsidiary of Aptevo that wholly owns the IXINITY and related Hemophilia B business. We are entitled to receive future potential payments to the extent of the achievement of certain regulatory and commercial milestones and through deferred payments based on net sales of IXINITY. Royalties are earned at the rate of 2% of net revenue through the earlier of June 2022 or completion of the IXINITY pediatric trial being run by Medexus. After that, the royalty rate will increase to 5%. We no longer control the development, marketing, and commercialization of IXINITY and are dependent on Medexus to successfully do so. Although Medexus has agreed to use commercially reasonable efforts to commercialize IXINITY in the ordinary course of business in good faith, Medexus may not commit adequate resources to the further development, marketing, and commercialization of IXINITY, may experience financial difficulties, may face competition, or may prioritize other products or initiatives. Due to the effect of the ongoing COVID-19 pandemic on the current and future environment for clinical development and regulatory approval, Medexus’ ability to continue to successfully commercialize the IXINITY business may be affected, and we may experience potential impacts on our future deferred payments from Medexus. The failure of Medexus to successfully market and commercialize IXINITY, including because of factors outside of Medexus’ control, could result in lower than expected milestone or deferred payments to us and negatively impact our future financial and operating results.

Our operating results are unpredictable and may fluctuate.

Our operating results are difficult to predict and will likely fluctuate from quarter to quarter and year to year, as a result of a variety of factors, including:

Due to the ongoing COVID-19 pandemic, we may experience delays in opportunities to partner our product candidates, due to financial and other impacts on potential partners. Additionally, we may experience potential impacts on our future milestone or deferred payments from Medexus, which may impact Medexus’ ability to continue to successfully commercialize the IXINITY businesses. In 2021, we continue to see an impact of COVID-19 on our business as some of our clinical sites were at reduced capacity. These and other factors may have a material adverse effect on our business, results of operations and financial condition.

Our future cash flow will depend, in part, on the ability of Pfizer to successfully sell RUXIENCE and our receipt of milestone and royalty payments from HCR in connection therewith. If Pfizer is unable, or does not devote sufficient resources, to maintain or continue increasing sales of RUXIENCE, or if HCR does not comply with the Royalty Purchase Agreement, our results of operations will be adversely affected.

On June 25, 2020, we announced that we will receive royalty payments from Pfizer related to sales of a rituximab biosimilar product, RUXIENCE (Rituximab-pvvr), which was approved by the U.S. Food and Drug Administration in July 2019 and launched by Pfizer in the United States and Japan in early 2020, and the European Union in the third quarter of 2020. The payments from Pfizer relate to a Collaboration and License Agreement acquired by us as part of our spin-off from Emergent in 2016, which applies a fixed royalty rate of 2.5% on global net sales. The agreement was originally executed by Trubion Pharmaceuticals (which was subsequently acquired by Emergent) and Wyeth (a wholly-owned subsidiary of Pfizer). The royalty term runs until the seventh anniversary of the first commercial sale of the biosimilar. Royalty payments to us are due within 60 days after the end of each quarter. Although the agreement was terminated in 2012, the royalty obligation thereunder survived.

On March 30, 2021, we entered into and closed a Royalty Purchase Agreement with HCR (Royalty Purchase Agreement) pursuant to which we sold to HCR the right to receive royalty payments made by Pfizer in respect of net sales of RUXIENCE. Under the terms of the Royalty Purchase Agreement, we received $35 million (the Investment Amount) at closing and we are eligible to receive additional payments in aggregate of up to an additional $32.5 million based on the achievement of sales milestones in 2022, 2023, and 2024 (collectively, the Milestone Amounts). The Royalty Purchase Agreement further provides that, once HCR reaches aggregate royalty payments totaling 190% of the Investment Amount plus the Milestone Amounts to the extent paid to us by HCR, we will be entitled to receive 50% of any additional royalty payments by Pfizer thereafter. The Company received a $10 million milestone payment in March 2022 and incurred $0.5 million in transaction costs. The proceeds from the milestone, net of transaction costs, will be recorded as additional liability related to sale of future royalties on the balance sheet in the first quarter of 2022. The Company is eligible to receive additional payments in aggregate of up to $22.5 million based on achievement of sales milestones in 2023 and 2024.

We have no control over the sales of RUXIENCE and are therefore dependent on the efforts and ability of Pfizer to generate net sales of RUXIENCE sufficient for us to receive Milestone Payments and additional royalty payments under the Royalty Purchase Agreement. The failure of Pfizer to successfully generate such net sales could negatively impact our future financial and operating results and our results of operations could therefore be adversely affected. Additionally, even if Pfizer is able to generate net sales of RUXIENCE sufficient for us to receive such payments, if HCR breaches the Royalty Purchase Agreement (for example, by not making required payments when due, or at all), disputes or litigation may arise. Such disputes or litigation could be time-consuming and expensive and could adversely affect our business.

We face product liability exposure, which could cause us to incur substantial liabilities and negatively affect our business, financial condition, and results of operations.

The nature of our business exposes us to potential liability inherent in pharmaceutical products, including with respect to the testing of our product candidates in clinical trials and any product candidates that we successfully develop. Product liability claims might be made by patients in clinical trials, consumers, health care providers or pharmaceutical companies or others that sell any products that we successfully develop. These claims may be made even with respect to those products that are manufactured in licensed and regulated facilities or otherwise receive regulatory approval for study or commercial sale. We cannot predict the frequency, outcome or cost to defend any such claims.

If we cannot successfully defend ourselves against future claims that our product candidates caused injuries, we may incur substantial liabilities. Regardless of merit or eventual outcome, product liability claims may result in:

• adverse publicity and/or injury to our reputation;

• withdrawal of clinical trial participants;

• costs to defend the related litigation;

• substantial monetary awards to trial participants or patients;

• decreased demand or withdrawal of an approved product;

• loss of revenue; and

• an inability to commercialize products that we may develop.

The amount of insurance that we currently hold may not be adequate to cover all liabilities that may occur. Further product liability insurance may be difficult and expensive to obtain. We may not be able to maintain insurance coverage at a reasonable cost and we may not be able to obtain insurance coverage that will be adequate to satisfy all potential liabilities. Claims or losses in excess of our product liability insurance coverage could have a material adverse effect on our business, financial condition, and results of operations. The cost of defending any product liability litigation or other proceeding, even if resolved in our favor, could be substantial. Uncertainties resulting from the initiation and continuation of product liability litigation or other proceedings could have a material adverse effect on our ability to compete in the marketplace. Product liability claims, regardless of merit or eventual outcome, may absorb significant management time and result in reputational harm, potential loss of revenue from decreased demand for any product candidates we successfully develop, withdrawal of clinical trial participants and potential termination of clinical trial sites or entire clinical programs, and could cause our stock price to fall.

Our success is dependent on our continued ability to attract, motivate and retain key personnel, and any failure to attract or retain key personnel may negatively affect our business.

Because of the specialized scientific nature of our business, our ability to develop products and to compete with our current and future competitors largely depends upon our ability to attract, retain and motivate highly qualified managerial and key scientific and technical personnel. If we are unable to retain the services of one or more of the principal members of senior management, including our Chief Executive Officer, Marvin L. White, our Chief Financial Officer, Jeffrey G. Lamothe, our General Counsel, SoYoung Kwon, our VP of Finance, Daphne Taylor, or other key employees, our ability to implement our business strategy could be materially harmed. We face intense competition for qualified employees from biotechnology and pharmaceutical companies, research organizations and academic institutions. Moreover, we have recently experienced increased levels of attrition. On August 25, 2021, Jane Gross, resigned as the Chief Scientific Officer of the Company effective September 17, 2021 and transitioned into a consulting relationship with the Company through December 31, 2021. Attracting, retaining or replacing these personnel on acceptable terms may be difficult and time-consuming given the high demand in our industry for similar personnel. We believe part of being able to attract, motivate and retain personnel is our ability to offer a competitive compensation package, including equity incentive awards. If we cannot offer a competitive compensation package or otherwise attract and retain the qualified personnel necessary for the continued development of our business, we may not be able to maintain our operations or grow our business. Due to our equity plan proposal not receiving stockholder approval at the Company’s annual meeting in 2021, we may not have sufficient equity available to attract and retain qualified personnel. In addition, we have experienced and may experience an impact on the health of key personnel due to the ongoing COVID-19 pandemic.

The ongoing COVID-19 pandemic could adversely impact our business, including our clinical trials.

Since March of 2020, a novel strain of coronavirus, COVID-19, has spread through the world, including the United States. The COVID-19 outbreak has caused severe global economic and societal disruptions and uncertainties, and we have experienced disruptions that have impacted our business and clinical trials, including, limitation of company operations, implementing work from home policies and office closures; delays or difficulties in receiving deliveries of critical experimental materials; delays or difficulties in enrolling patients in our clinical trials; delays or difficulties in clinical site initiation, including difficulties in recruiting clinical site investigators and clinical site staff; diversion of healthcare resources away from the conduct of clinical trials, including the diversion of hospitals serving as our clinical trial sites and hospital staff supporting the conduct of our clinical trials; interruption of key clinical trial activities, such as patient enrollment and clinical trial site monitoring; and, limitations in employee resources that would otherwise be focused on our business, including the conduct of our research and development activities and process development activities, due to the illness of employees or their families, or the preference of employees to avoid contact with large groups of people.

We may continue to experience disruptions in the future, or additional disruptions that could severely impact our business, such as delays or difficulties to the financing environment and raising capital due to economic

uncertainty; delays in opportunities to partner our product candidates, due to financial and other impacts on potential partners; diversion of healthcare resources away from the conduct of clinical trials, including the diversion of hospitals serving as our clinical trial sites and hospital staff supporting the conduct of our clinical trials; potential impacts on our future deferred payments and milestones from Medexus due to the environment which may impact Medexus’ ability to continue to successfully commercialize the IXINITY business or Pfizer to successfully commercialize RUXIENCE; and negative impacts on suppliers and licensees. The global outbreak of COVID-19 continues to rapidly evolve. The ongoing COVID-19 pandemic may also result in the need to suspend enrollment into studies, patient withdrawals, postponement of preclinical studies, study modification, suspension, or termination, the introduction of remote study procedures and modified informed consent procedures, study site changes, direct delivery of investigational products to patient homes requiring state licensing, study deviations or noncompliance, and changes or delays in site monitoring. The foregoing may require that we consult with relevant review and ethics committees and the FDA or comparable foreign regulatory authorities. The foregoing may also impact the integrity of our study data. The pandemic could further impact our ability to interact with the FDA or other regulatory authorities, and may result in delays in the conduct of inspections or review of pending submissions.

The ongoing COVID-19 pandemic may further impact our suppliers and manufacturers. If any of our suppliers or manufacturers are adversely impacted by the COVID-19 pandemic or the restrictions resulting from the outbreak, if they cannot obtain the necessary supplies, or if such third parties need to prioritize other products or customers over us, including under the Defense Production Act, we may experience delays or disruptions in our supply chain, which could have a material and adverse impact on our business and development plans. Third party manufacturers may also need to implement measures and changes, or deviate from typical requirements, because of the COVID-19 pandemic that may otherwise adversely impact our supply chains or the quality of the resulting products or supplies. Depending on the change, we may need to obtain FDA pre-approval or otherwise provide FDA with a notification of the change.

The ongoing COVID-19 pandemic may result in changes in laws, policies, and regulations. By example, due to the potential impact of the COVID-19 outbreak on clinical trials, drug development, and manufacturing, FDA issued guidance several times concerning how sponsors and investigators may address these challenges. FDA’s guidance is continually evolving. By further example, in March 2020, the U.S. Congress passed the Coronavirus Aid, Relief, and Economic Security Act, or CARES Act, which includes various provisions regarding FDA drug shortage reporting requirements, as well as provisions regarding supply chain security, such as risk management plan requirements, and the promotion of supply chain redundancy and domestic manufacturing. This and any future changes in law may require that we change our internal processes and procedures to ensure continued compliance.

The extent to which the ongoing COVID-19 pandemic may impact our business and clinical trials will depend on future developments, which are highly uncertain and cannot be predicted with confidence, such as the ultimate geographic spread of the disease, the duration of the outbreak, travel restrictions and social distancing in the United States and other countries, business closures or business disruptions, the effectiveness of actions taken in the United States and other countries to contain and treat the disease, including the effectiveness of vaccination programs, and whether businesses and the economy in general will continue to reopen and stay open.

The terms of our credit agreement may restrict the operation of our business and limit the cash available for investment in our business operations.

In August 2020, we entered into a Credit and Security Agreement (the Credit Agreement), by and among us and certain of our subsidiaries as borrowers, MidCap Financial, as agent, and the lenders from time to time party thereto. The terms of the Credit Agreement and borrowings we may make under the Credit Agreement in the future, could have significant adverse consequences for our business, including:

We may not have sufficient funds or be able to obtain additional financing to pay the amounts due under the Credit Agreement. In addition, failure to comply with the covenants under the Credit Agreement, including those outside of our control, could result in an event of default. An event of default could result in the acceleration of amounts due under the Credit Agreement, and we may not be able to obtain additional financing to make any accelerated payments. Under these circumstances, our lenders could seek to enforce security interests in our assets securing our indebtedness, including our intellectual property.

We completed a Section 382 study and experienced an “ownership change” as defined in Section 382 of the U.S. Internal Revenue Code of 1986, as amended (the Code), the tax benefits of our pre-“ownership change” net operating loss carryforwards and certain other tax attributes will be subject to annual limitation under Sections 382 and 383 of the Code, none of which permanently limits our federal tax attributes assuming sufficient income.

In general, a corporation undergoes an “ownership change” under Section 382 of the Code if, among other things, the stockholders who own, directly or indirectly, 5% or more of the corporation’s stock (by value), or are otherwise treated as “5% stockholders” under Section 382 of the Code and the Treasury regulations promulgated thereunder, increase their aggregate percentage ownership (by value) of the corporation’s stock by more than 50 percentage points over the lowest percentage of value owned by the 5% stockholders at any time during the applicable testing period, which is generally the rolling three-year period preceding the potential ownership change. Such potential ownership change testing events include changes involving a stockholder becoming a 5% stockholder or arising from a new issuance of capital stock or share repurchases by the corporation, subject to certain exceptions.

In the event of an “ownership change,” Sections 382 and 383 of the Code impose an annual limitation on the amount of taxable income a corporation may offset with pre-change net operating loss carryforwards and certain other tax attributes. The annual limitation is generally equal to the value of the outstanding stock of the corporation immediately before the ownership change (excluding certain capital contributions), multiplied by the long-term tax-exempt rate as published by the IRS for the month in which the ownership change occurs (the long-term tax-exempt rate for November 2020 is 0.89%). Any unused annual limitation may generally be carried over to subsequent years until the pre-ownership change net operating loss carryforwards and certain other tax attributes expire or are fully utilized by the corporation. Similar provisions of state tax law may also apply to limit the use of state net operating loss carryforwards and certain other tax attributes.

Additionally, Section 382 of the Code includes special rules that apply to a corporation with a significant amount of net unrealized built-in gains or net unrealized built-in losses in its assets immediately prior to ownership change under Section 382 of the Code. In general, certain built-in gains recognized during the five-year period beginning on the date of the ownership change increases the corporation’s annual limitation under Section 382 and 383 of the Code in the taxable year that such built-in gains are recognized or deemed recognized (but only up to the amount of the net unrealized built-in gain), while certain built-in losses recognized during such five-year period is subject to the annual limitation under Section 382 of the Code (but only up to the amount of the net unrealized built-in loss).

As of December 31, 2021, we had approximately $159.6 million and $70.3 million of federal and state net operating loss carryforwards, respectively, available to reduce future taxable income that will begin to expire in 2037 for federal purposes. These net operating loss carryforwards could expire unused and be unavailable to offset future income tax liabilities. Federal net operating loss carryforwards incurred in 2018 and in future years may be carried forward indefinitely, but the usage of such federal net operating losses is limited. We completed an IRC Section 382 study on our federal tax attributes and determined that the annual utilization of federal net operating loss carryforwards is limited. It is not expected that the annual limitations will result in the expiration of tax attribute carryforwards prior to utilization assuming sufficient income.

We cannot predict or control the occurrence or timing of another ownership change under Section 382 of the Code in the future. In addition, it is possible that any offering of securities by us could result in an ownership change. If another ownership change were to occur, future limitations could apply to our net operating losses and certain other tax attributes, which could result in a material amount of our net operating loss carryforwards and certain other tax attributes becoming unavailable to offset future income tax liabilities.

The realization of all or a portion of our deferred income tax assets (including net operating loss carryforwards) is dependent upon the generation of future income during the statutory carryforward periods. Our inability to utilize our limited pre-ownership change net operating loss carryforwards and certain other tax attributes, or the occurrence of a future ownership change and resulting additional limitations to these tax attributes, could have a material adverse effect on our financial condition, results of operations and cash flows.

Our investments are subject to market and credit risks that could diminish their value and these risks could be greater during periods of extreme volatility or disruption in the financial and credit markets, which could adversely impact our business, financial condition, results of operations, liquidity and cash flows.

Our investments and derivative financial instruments are subject to risks of credit defaults and changes in market values. Periods of macroeconomic weakness or recession, heightened volatility or disruption in the financial and credit markets could increase these risks, potentially resulting in other-than-temporary impairment of assets in our investment portfolio. The impact of geopolitical tension, such as a deterioration in the bilateral relationship between the US and China or increasing escalation of conflict between Russia and Ukraine, including any additional sanctions, export controls or other restrictive actions that may be imposed by the US and/or other countries against governmental or other entities in, for example, Russia, also could lead to disruption, instability and volatility in the global markets, which may have an impact on our investments across negatively impacted sectors or geographies.

Product Development Risks

The results of our current and planned preclinical studies and clinical trials may not satisfy the requirements of the FDA or non-U.S. regulatory authorities. Results from early-preclinical studies and clinical trials may not be predictive of results from later-stage or other trials and interim or top line data may be subject to change or qualification based on the complete analysis of data.

We are very early in our clinical trial with APVO436 and clinical failure can occur at any stage of preclinical or clinical development. Preclinical studies and clinical trials may produce negative or inconclusive results. The FDA or a non-US regulatory authority may require us to conduct additional clinical or preclinical testing. Success in early preclinical studies and clinical trials does not mean that future larger registration clinical trials will be successful and interim results of a clinical trial do not necessarily predict final results. Product candidates in later-stage clinical trials may fail to demonstrate sufficient safety and efficacy to the satisfaction of the FDA and non-U.S. regulatory authorities despite having progressed through initial clinical trials. In some instances, there can be significant variability in safety or efficacy results between different clinical trials of the same product candidate due to numerous factors, including changes in trial procedures set forth in protocols, differences in the size and type of the patient populations, changes in adherence to the dosing regimen and other clinical trial protocols and the rate of dropout among clinical trial participants. In addition, preclinical and clinical data are often susceptible to various interpretations and analyses, and many companies whose product candidates performed satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain marketing approval. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy profile despite having progressed through preclinical studies and initial clinical trials. A number of companies in the pharmaceutical and biopharmaceutical industry have suffered significant setbacks in advanced clinical trials due to lack of efficacy or adverse safety profiles, notwithstanding promising results in earlier studies, and we cannot be certain that we will not face similar setbacks. Even if early-stage clinical trials are promising, we may need to conduct additional clinical trials of our product candidates in additional patient populations or under different treatment conditions before we are able to seek approvals from the FDA and regulatory authorities outside the United States to market and sell these product candidates. Any of these events could limit the commercial potential of our product candidates and have a material adverse effect on our business, prospects, financial condition and results of operations. A number of companies in the pharmaceutical industry, including those with greater resources and experience than us, have suffered significant setbacks in advanced clinical trials, even after obtaining promising results in earlier clinical trials.

In addition, our APVO436 clinical trial are open-label studies and conducted at a limited number of clinical sites on a limited number of patients. An “open-label” clinical trial is one where both the patient and investigator know whether the patient is receiving the investigational product candidate or either an existing approved drug or placebo. Most typically, open-label clinical trials test only the investigational product candidate and sometimes may do so at different dose levels. Open-label clinical trials are subject to various limitations that may exaggerate any therapeutic effect as patients in open-label clinical trials are aware when they are receiving treatment. Open-label clinical trials may be subject to a “patient bias” where patients perceive their symptoms to have improved merely due to their awareness of receiving an experimental treatment. In addition, open-label clinical trials may be subject to an “investigator bias” where those assessing and reviewing the physiological outcomes of the clinical trials are aware of which patients have received treatment and may interpret the information of the treated group more favorably given this knowledge. The results from these clinical trials may not be predictive of future clinical trial results with APVO436 or other product candidates.

We may publicly disclose top line or interim data from time to time, which is based on a preliminary analysis of then-available data, and the results and related findings and conclusions are subject to change following a more comprehensive review of the data related to the particular study or trial. The top line or interim results that we report may differ from future results of the same studies, or different conclusions or considerations may qualify such results once additional data have been received and fully evaluated. Even in situations where a clinical stage candidate appears to be benefiting a patient, that benefit may not be of a permanent nature. Top line and interim data also remain subject to audit and verification procedures, that may result in the final data being materially different from the preliminary data we previously published. In addition, the achievement of one primary endpoint for a trial does not guarantee that additional co-primary endpoints or secondary endpoints will be achieved. Further, others, including regulatory agencies, may not accept or agree with our assumptions, estimates, calculations, conclusions or analyses or may interpret or weigh the importance of data differently, which could impact the value of the particular program, the approvability or commercialization of the particular product candidate or product and our company in general. In addition, the information we choose to publicly disclose regarding a particular study or clinical trial is based on what is typically extensive information, and you or others may not agree with what we determine is material or otherwise appropriate information to include in our disclosure.

Our future clinical trials may not be successful. Moreover, should there be a flaw in a clinical trial, it may not become apparent until the clinical trial is well advanced. We may also experience numerous unforeseen events during, or as a result of, clinical trials that could delay or prevent our ability to receive marketing approval or commercialize our product candidates, including:

Further, our product candidates may not be approved even if they achieve their primary endpoints in Phase 3 clinical trials or registration trials. Regardless of any advisory committee recommendation, the FDA may decline to approve the BLA for a number of reasons including, if the clinical benefit, safety profile or effectiveness of the drug is not deemed by the FDA to warrant approval. The FDA or other non-U.S. regulatory authorities may disagree with our trial design, and our interpretation of data from non-clinical studies and clinical trials. In particular, the FDA may not view our data as being clinically meaningful or statistically persuasive. In addition, any of these regulatory authorities may change requirements for the approval of a product candidate even after reviewing and providing comments or advice on a protocol for a pivotal Phase 3 clinical trial. Any of these regulatory authorities may also approve a product candidate for fewer or more limited indications than we request or may grant approval contingent on the performance of costly post-marketing clinical trials. The FDA or other non-U.S. regulatory authorities may not approve the labeling claims that we believe would be necessary or desirable for the successful commercialization of our product candidates.

We may not be able to file investigational new drug applications, or INDs, or IND amendments to commence additional clinical trials on the timelines we expect, and even if we are able to, the FDA may not permit us to proceed.

We expect to submit an IND for ALG.APV-527 to the FDA in 2022, however, we may not be able to file future INDs for our product candidates on the timelines we expect. For example, we may experience manufacturing delays or other delays with IND-enabling studies. Moreover, we cannot be sure that submission of an IND will result in the FDA allowing further clinical trials to begin, or that, once begun, issues will not arise that suspend or terminate clinical trials. Additionally, even if such regulatory authorities agree with the design and implementation of the clinical trials set forth in an IND, we cannot guarantee that such regulatory authorities will not change their requirements in the future. These considerations also apply to new clinical trials we may submit as amendments to existing INDs or to a new IND. Any failure to file INDs on the timelines we expect or to obtain regulatory approvals for our trials may prevent us from completing our clinical trials or commercializing our products on a timely basis, if at all.

If we experience delays or difficulties in the commencement, enrollment of patients or completion of our clinical trials, the time to reach critical trial data and receipt of any necessary regulatory approvals could be delayed.

We may not be able to initiate or continue clinical trials for our product candidates if we are unable to locate, enroll and maintain a sufficient number of eligible patients to participate in these trials as required by the FDA or similar regulatory authorities outside the United States. In addition, some of our competitors have ongoing clinical trials for product candidates that treat the same indications as our product candidates, and patients who would otherwise be eligible for our clinical trials may instead enroll in clinical trials of our competitors’ product candidates. Furthermore, APVO436 has received orphan drug designation for AML and thus has a relatively small patient population. Also, the eligibility criteria of our clinical trials may further limit the pool of available study

participants as we require that patients have specific characteristics that we can measure to assure their disease is either severe enough or not too advanced to include them in a study. In addition, the global outbreak of the COVID-19 pandemic makes it more difficult to initiate studies and enroll patients and the process of finding and diagnosing eligible patients under these conditions may prove costly.

Patient enrollment is affected by other factors including:

• the severity of the disease under investigation;

• the perceived risks and benefits of the product candidate under study;

• our payments for conducting clinical trials;

• the patient referral practices of physicians;

• our ability to obtain and maintain patient consents;

• the ability to monitor patients adequately during and after treatment;

• reporting of preliminary results of any of our clinical trial sites;

Our inability to enroll a sufficient number of patients for clinical trials could result in significant delays and could require us to abandon one or more clinical trials altogether. Enrollment delays in our clinical trials may result in increased development costs for our product candidates, delays in the availability of preliminary or final results, and delays to commercially launching our product candidates, if approved, which may cause the value of our company to decline and limit our ability to obtain additional financing.

Serious adverse events, undesirable side effects or other unexpected properties of our product candidates may be identified that could delay, prevent, or cause the withdrawal of regulatory approval, limit the commercial potential, or result in significant negative consequences following marketing approval.

Serious adverse events or undesirable side effects caused by, or other unexpected properties of any of our product candidates, either when used alone or in combination with other approved or investigational therapies, could cause us or regulatory authorities to interrupt, delay or halt our development activities and manufacturing and distribution operations and could result in a more restrictive label, the imposition of a clinical hold, suspension, distribution or use restrictions or the delay or denial of regulatory approval by the FDA or comparable foreign regulatory authorities. If any of our product candidates are associated with serious adverse events or undesirable side effects or have properties that are unexpected, we may need to abandon their development or limit development to certain uses or subpopulations in which the undesirable side effects or other characteristics are less prevalent, less severe or more acceptable from a risk-benefit perspective. Many compounds that initially showed promise in clinical or earlier stage testing have later been found to cause undesirable or unexpected side effects that prevented further development of the compound.

As we continue developing our product candidates and conduct clinical trials of our product candidates, serious adverse events, or SAEs, undesirable side effects, relapse of disease or unexpected characteristics may emerge causing us to abandon these product candidates or limit their development to more narrow uses or subpopulations in which the SAEs or undesirable side effects or other characteristics are less prevalent, less severe or more acceptable from a risk-benefit perspective or in which efficacy is more pronounced or durable. Undesirable side effects, or other unexpected adverse events or properties of any of our product candidates, could arise or become known either during clinical development or, if approved, after the approved product has been marketed. If such an event occurs during development, the FDA or comparable foreign regulatory authorities could suspend or terminate a clinical trial or deny approval of our product candidates. Furthermore, we may to evaluate our product candidates in combination with approved and/or experimental therapies. These combinations may have additional or

more severe side effects than caused by our product candidate as monotherapies. The uncertainty resulting from the use of our product candidate in combination with other therapies may make it difficult to accurately predict side effects or efficacy in potential future clinical trials. If our product candidates receive marketing approval and we or others later identify undesirable side effects caused by such products, a number of potentially significant negative consequences may result, including:

• regulatory authorities may require one or more post-market studies;

• we could be sued and held liable for harm caused to patients; and

• our reputation may suffer.

Any of these events could prevent us from achieving or maintaining market approval and acceptance of the affected product candidate, or could substantially increase commercialization costs and expenses, which could delay or prevent us from generating revenue from the sale of our products and materially harm our business and results of operations.

We depend on third parties to conduct our clinical and non-clinical trials. If these third parties do not effectively carry out their contractual duties, comply with regulatory requirements or meet expected deadlines, we may not be able to obtain regulatory approval for or commercialize our product candidates and our business could be substantially harmed.

We do not have the ability to independently conduct the clinical and preclinical trials required to obtain regulatory approval for our product candidates. We depend on third parties, such as independent clinical investigators, contract research organizations, or CROs, and other third-party service providers to conduct the clinical and preclinical trials of our product candidates, and we expect to continue to do so. For example, Dr. Dirk Huebner is providing clinical trial and medical affairs oversight duties as an independent consultant. We rely heavily on Dr. Huebner and these other third parties for successful execution of our clinical and preclinical trials, but we do not exercise day to day control over their activities.

While we have agreements governing the activities of third parties, we have limited influence and control over their actual performance and activities. For instance, our third-party service providers are not our employees, and except for remedies available to us under our agreements with such third parties we cannot control whether or not they devote sufficient time and resources to our ongoing clinical, and non-clinical programs. Our third-party service providers may also have relationships with other entities, some of which may be our competitors, for whom they may also be conducting trials or other therapeutic development activities that could harm our competitive position. If these third parties do not successfully carry out their contractual duties, meet expected deadlines or conduct our non-clinical studies or clinical trials in accordance with regulatory requirements or our stated protocols, if they need to be replaced or if the quality or accuracy of the data they obtain is compromised due to the failure to adhere to our protocols, regulatory requirements or for other reasons, our trials may be repeated, extended, delayed, or terminated, we may not be able to obtain, or may be delayed in obtaining, marketing approvals for our product candidates, we may not be able to, or may be delayed in our efforts to, successfully commercialize our product candidates, or we or they may be subject to regulatory enforcement actions.

Our reliance on third-party service providers does not relieve us of our regulatory responsibilities, including ensuring that our trials are conducted in accordance with the FDA-approved good clinical practices, or GCPs, and the plans and protocols contained in the relevant regulatory application. In addition, these organizations and individuals may not complete these activities on our anticipated or desired timeframe. We also may experience unexpected cost increases that are beyond our control. Problems with the timeliness or quality of the work of a contract research organization may lead us to seek to terminate the relationship and use an alternative service provider, which may prove difficult and/or costly and result in a delay of our trials. In addition, business disruptions arising from the ongoing COVID-19 pandemic could negatively affect the ability of some of the independent clinical investigators, contract research organizations and other third-party service providers that conduct our clinical and preclinical trials of our product candidates. Any delay in or inability to complete our trials could delay or prevent the development, approval, and commercialization of our product candidates.

If CROs or other third parties assisting us or our study sites fail to comply with applicable GCPs, the clinical data generated in our clinical trials may be deemed unreliable and the FDA or its non-U.S. counterparts may require us to perform additional clinical trials before approving our marketing applications. We or they may also face regulatory enforcement action. We cannot assure you that, upon inspection, the FDA or non-U.S. regulatory agencies will determine that any of our clinical trials comply with GCPs. In addition, our clinical trials must be conducted with product produced under GMPs and similar regulations outside of the United States. Our failure, or the failure of our product manufacturers, to comply with these regulations may require us to repeat or redesign clinical trials, or conduct additional trials, which would increase our development costs and delay or impact the likelihood of regulatory approval.

If third parties do not carry out their duties under their agreements with us, if the quality or accuracy of the data they obtain is compromised due to the failure to adhere to our clinical protocols, including dosing requirements, or regulatory requirements, or if they otherwise fail to comply with clinical trial protocols or meet expected deadlines, our clinical trials may not meet regulatory requirements. If our clinical trials do not meet regulatory requirements or if these third parties need to be replaced, our clinical trials may be extended, delayed, suspended or terminated.

Agreements with third parties conducting or otherwise assisting with our clinical or non-clinical studies might terminate for a variety of reasons, including a failure to perform by the third parties. If any of our relationships with these third parties terminate, we may not be able to enter into arrangements with alternative providers or to do so on commercially reasonable terms. Switching or adding additional third parties involves additional cost and requires management time and focus. In addition, there is a natural transition period when a new third party commences work. As a result, if we need to enter into alternative arrangements, it could delay our product development activities and adversely affect our business. Though we carefully manage our relationships with our third parties, there can be no assurance that we will not encounter challenges or delays in the future or that these delays or challenges will not have a material adverse impact on our business, financial condition and prospects, and results of operations.

If any of these events occur, we may not be able to obtain regulatory approval of our product candidates or succeed in our efforts to create approved line extensions for certain of our existing products or generate additional useful clinical data in support of these products. Moreover, if we are unable to obtain any necessary third-party services on acceptable terms or if these service providers do not successfully carry out their contractual duties or meet expected deadlines, our efforts to obtain regulatory approvals for our product candidates may be delayed or prevented.

Manufacture of our product candidates, especially in large quantities, is complex and time consuming. The loss of any of our third-party manufacturers, or delays or problems in the manufacture our product candidates, could result in product shortages and/or delays in clinical development.

We do not have manufacturing capabilities and do not plan to develop such capacity in the foreseeable future. We depend on a limited number of third-party suppliers for our product candidates. Accordingly, our ability to develop and deliver products in a timely and competitive manner and to enable us to conduct our development programs depends on our third-party manufacturers being able to continue to meet our ongoing clinical trial needs and perform their contractual obligations. In order to successfully develop and commercialize our product candidates in a timely manner, we and our third-party manufacturers must be able to develop and execute on manufacturing processes and reach agreement on contract terms.

Our current and anticipated future dependence upon others for the manufacture of our product candidates or any product that we develop may adversely affect our future profit margins and our ability to commercialize any products that receive marketing approval on a timely and competitive basis. In addition, any performance failure on the part of our existing or future manufacturers could delay clinical development or marketing approval.

If these third-party manufacturers do not successfully carry out their contractual duties, meet expected deadlines or manufacture our product candidates in accordance with regulatory requirements, if there are disagreements between us and such parties, or if such parties are unable to expand capacities to support commercialization of any of our product candidates for which we obtain marketing approval, we may not be able to produce, or may be delayed in producing sufficient product candidates to meet our supply requirements. Any delays in obtaining adequate supplies with respect to our product candidates and components may delay the development or commercialization of our product candidates.

We may not succeed in our efforts to establish manufacturing relationships or other alternative arrangements for any of our product candidates, components, and programs. Our product candidates may compete with other products and product candidates for access to manufacturing facilities. There are a limited number of manufacturers that operate under GMP regulations and that are both capable of manufacturing for us and willing to do so.

If our existing third-party manufacturers, or the third parties that we engage in the future to manufacture a product or component for commercial sale or for our clinical trials should cease to continue to do so for any reason, we likely would experience delays in obtaining sufficient quantities of our product candidates for us to meet commercial demand or to advance our clinical trials while we identify and qualify replacement suppliers. These third-party facilities may also be affected by natural disasters, such as floods or fire, or such facilities could face manufacturing issues, such as contamination or regulatory findings following a regulatory inspection of such facility. In such instances, we may need to locate an appropriate replacement third-party relationship, which may not be readily available or on acceptable terms, which would cause additional delay and increased expense. In some cases, the technical skills required to manufacture our products or product candidates may be unique or proprietary to the original manufacturer and we may have difficulty, or there may be contractual restrictions prohibiting us from, transferring such skills to an alternate supplier in a timely fashion if at all. The addition of a new or alternative manufacturer may also require FDA approvals and may have a material adverse effect on our business.

If for any reason we are unable to obtain adequate supplies of our product candidates or the components used to manufacture them, it will be more difficult for us to develop our product candidates and compete effectively. Further, even if we do establish such collaborations or arrangements, our third-party manufacturers may breach, terminate, or not renew these agreements.

We or our third-party manufacturers may also encounter shortages in the raw materials or therapeutic substances necessary to produce our product candidates in the quantities needed for our clinical trials or, if our product candidates are approved, in sufficient quantities for commercialization or to meet an increase in demand. Such shortages may occur for a variety of reasons, including capacity constraints, delays or disruptions in the market, and shortages caused by the purchase of such materials by our competitors or others. We may also not be able to obtain such materials on favorable terms as a result of global trade policies. Our or our third-party manufacturers’ failure to obtain the raw materials, therapeutic substances, or active pharmaceutical ingredients necessary to manufacture sufficient quantities of our product candidates may have a material adverse effect on our business.

All of our current product candidates are biologics. Our product candidates must be made consistently and in compliance with a clearly defined manufacturing process. Problems may arise during manufacturing for a variety of reasons, including problems with raw materials, equipment malfunction or replacement and failure to follow specific protocols and procedures. Slight deviations anywhere in the manufacturing process, including obtaining materials, maintaining master seed or cell banks and preventing genetic drift, seed or cell growth, fermentation and contamination including from, among other things, particulates, filtration, filling, labeling, packaging, storage and shipping, and quality control testing, may result in lot failures or manufacturing shut-down, delays in the release of lots, product recalls, spoilage or regulatory action. Due to the ongoing COVID-19 pandemic, our third-party manufacturers may experience difficulties that impact our product candidates.

Additionally, our development and commercialization strategy involves entering into arrangements with corporate and academic collaborators, contract research organizations, distributors, third-party manufacturers, licensors, licensees and others to conduct development work, manage or conduct our clinical trials, manufacture our

product candidates and market and sell our products outside of the United States and maintaining our existing arrangements with respect to the commercialization or manufacture of our products. We may not have the expertise or the resources to conduct all of these activities for all products and product candidates on our own and, as a result, are particularly dependent on third parties in many areas. Any current or future arrangements for development and commercialization may not be successful, as the amount and timing of resources that third parties devote to developing, manufacturing, and commercializing our products candidates are not within our control. If we are not able to establish or maintain agreements relating to our product candidates in development, our results of operations and prospects would be materially and adversely affected.

Any loss of a third-party manufacturer, any delays, or problems in the manufacture of our products, or termination of any arrangements for development and commercialization of our products could have a material adverse effect on our business, operations, results of operations and financial condition. We may be required to replace our manufacturer and if this were to occur, we may incur added costs and delays in identifying and qualifying any such replacements. We may also not be able to enter into such arrangements on favorable commercial terms.

Failure of our third-party manufacturers to successfully manufacture material that conforms to our specifications and the FDA’s or foreign regulatory authorities’ strict regulatory requirements, may prevent regulatory approval of those manufacturing facilities.

APVO US Equity

APVO · 10-K · period ended 2021-12-31

Item 1. Business.

Item 1A. Risk Factors.

APVO US Equity☆

APVO · 10-K · period ended 2021-12-31

Item 1. Business.

Item 1A. Risk Factors.

APVO US Equity