Annexon, Inc.

Previous wording

We have had significant operating losses since our inception. Our net loss for the years ended December 31, 2025 and 2024 was approximately $206.7 million and $138.2 million, respectively, and our net loss for the three and six months ended June 30, 2026 was approximately $55.3 million and $99.5 million, respectively. As of June 30, 2026, we had an accumulated deficit of approximately $1.0 billion. Substantially all of our losses have resulted from expenses incurred in connection with our research and development programs and from general and administrative costs associated with our operations. We expect to continue to incur losses for the foreseeable future, and we anticipate these losses will continue as we develop our product candidates, conduct clinical trials and pursue research and development activities. Even if we achieve profitability in the future, we may not be able to sustain profitability in subsequent periods. Our prior losses, combined with expected future losses, have had and will continue to have an adverse effect on our stockholders’ equity and working capital.

Current wording

We have had significant operating losses since our inception. Our net loss for the years ended December 31, 2025 and 2024 was approximately $206.7 million and $138.2 million, respectively, and our net loss for the three and nine months ended September 30, 2026 was approximately $51.2 million and $150.7 million, respectively. As of September 30, 2026, we had an accumulated deficit of approximately $1.1 billion. Substantially all of our losses have resulted from expenses incurred in connection with our research and development programs and from general and administrative costs associated with our operations. We expect to continue to incur losses for the foreseeable future, and we anticipate these losses will continue as we develop our product candidates, conduct clinical trials and pursue research and development activities. Even if we achieve profitability in the future, we may not be able to sustain profitability in subsequent periods. Our prior losses, combined with expected future losses, have had and will continue to have an adverse effect on our stockholders’ equity and working capital.

Previous wording

Since our inception, we have invested a significant portion of our efforts and financial resources in research and development activities. Our product candidates will require additional clinical development, and we intend to conduct additional research and development activities to discover and develop new product candidates, including conducting preclinical studies and clinical trials, all of which will require substantial additional funds. We will continue to expend significant resources for the foreseeable future in connection with these activities. These expenditures will include costs associated with conducting preclinical studies and clinical trials, obtaining regulatory approvals and manufacturing and supply, as well as marketing and selling any products approved for sale. In addition, other unanticipated costs may arise. Because the outcome of any preclinical study or clinical trial is highly uncertain, we cannot reasonably estimate the actual amounts necessary to successfully complete the development and commercialization of our product candidates or any future product candidates.

Current wording

Since our inception, we have invested a significant portion of our efforts and financial resources in research and development activities. Our product candidates will require additional clinical development, and if approved, will require additional commercialization efforts. We also intend to conduct additional research and development activities to discover and develop new product candidates, including conducting preclinical studies and clinical trials, all of which will require substantial additional funds. We will continue to expend significant resources for the foreseeable future in connection with these activities. These expenditures will include costs associated with conducting preclinical studies and clinical trials, obtaining regulatory approvals and manufacturing and supply, as well as marketing and selling any products approved for sale. In addition, other unanticipated costs may arise. Because the outcome of any preclinical study or clinical trial is highly uncertain, we cannot reasonably estimate the actual amounts necessary to successfully complete the development and commercialization of our product candidates or any future product candidates.

Previous wording

As of June 30, 2026, we had capital resources consisting of cash and cash equivalents and short-term investments of approximately $209.2 million. We expect our existing capital resources to fund planned operating expenses into 2028. However, our operating plans may change as a result of many factors currently unknown to us, and we may need to seek additional funds sooner than planned through public or private equity offerings or debt financings or other sources, such as strategic collaborations. We may also need to seek additional funds sooner than planned as result of changes in our development plans and regulatory requirements to support registration of our product candidates. Such financing may result in dilution to our stockholders, imposition of burdensome debt covenants and repayment obligations, or other restrictions that may affect our business. In addition, we may seek additional capital due to favorable market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans.

Current wording

As of September 30, 2026, we had capital resources consisting of cash and cash equivalents and short-term investments of approximately $213.4 million. We expect our existing capital resources to fund planned operations into 2028. However, our operating plans may change as a result of many factors currently unknown to us, and we may need to seek additional funds sooner than planned through public or private equity offerings or debt financings or other sources, such as strategic collaborations. We may also need to seek additional funds sooner than planned as a result of changes in our development plans and regulatory requirements to support registration of our product candidates. Such financing may result in dilution to our stockholders, imposition of burdensome debt covenants and repayment obligations, or other restrictions that may affect our business. In addition, we may seek additional capital due to favorable market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans.

Previous wording

We also could be required to seek funds through arrangements with collaborators or others that may require us to relinquish rights to some of our technologies or product candidates that we would otherwise pursue on our own. We do not expect to realize revenue from sales of products or royalties from licensed products in the foreseeable future, if at all, and unless and until our product candidates are clinically tested, approved for commercialization and successfully marketed. To date, we have primarily financed our operations through the sale of equity securities and warrants to purchase our equity securities. For example, in March 2026, we entered into a sales agreement (as amended from time to time), or Sales Agreement, with TD Securities (USA) LLC, or TD Cowen, pursuant to which we may offer and sell, from time to time through TD Cowen, at our option, shares of our common stock having an aggregate offering price of up to $150 million under an at-the-market offering program. We will be required to seek additional funding in the future and currently intend to do so through public or private equity offerings or debt financings, credit or loan facilities, collaborations or a combination of one or more of these funding sources. Our ability to raise additional funds will depend on financial, economic and other factors, many of which are beyond our control. Additional funds may not be available to us on acceptable terms or at all. If we raise additional funds by issuing equity securitiesi ncluding pursuant to sales under the Sales Agreement, our stockholders will suffer dilution and the terms of any financing may adversely affect the rights of our stockholders. In addition, as a condition to providing additional funds to us, future investors may demand, and may be granted, rights superior to those of existing stockholders. Debt financing, if available, is likely to involve restrictive covenants limiting our flexibility in conducting future business activities, and, in the event of insolvency, debt holders would be repaid before holders of our equity securities received any distribution of our corporate assets.

Current wording

We also could be required to seek funds through arrangements with collaborators or others that may require us to relinquish rights to some of our technologies or product candidates that we would otherwise pursue on our own. We do not expect to realize revenue from sales of products or royalties from licensed products in the foreseeable future, if at all, and unless and until our product candidates are clinically tested, approved for commercialization and successfully marketed. To date, we have primarily financed our operations through the sale of equity securities and warrants to purchase our equity securities. For example, in March 2026, we entered into a sales agreement (as amended from time to time), or Sales Agreement, with TD Securities (USA) LLC, or TD Cowen, pursuant to which we may offer and sell, from time to time through TD Cowen, at our option, shares of our common stock having an aggregate offering price of up to $150 million under an at-the-market offering program. In July 2026, we also incurred indebtedness of $50.0 million pursuant to a loan agreement with Oxford Finance LLC, as collateral agent, and certain other lenders from time to time. We will be required to seek additional funding in the future and currently intend to do so through public or private equity offerings or debt financings, credit or loan facilities, collaborations or a combination of one or more of these funding sources. Our ability to raise additional funds will depend on financial, economic and other factors, many of which are beyond our control. Additional funds may not be available to us on acceptable terms or at all. If we raise additional funds by issuing equity securitiesi ncluding pursuant to sales under the Sales Agreement, our stockholders will suffer dilution and the terms of any financing may adversely affect the rights of our stockholders. In addition, as a condition to providing additional funds to us, future investors may demand, and may be granted, rights superior to those of existing stockholders. Debt financing, if available, is likely to involve restrictive covenants limiting our flexibility in conducting future business activities, and, in the event of insolvency, debt holders would be repaid before holders of our equity securities received any distribution of our corporate assets.

Previous wording

Our ability to meet our payment obligations under the Loan Agreement depends on our ability to generate significant cash flows or obtain external financing in the future. This, to some extent, is subject to market, economic, financial, competitive, legislative, and regulatory factors as well as other factors that are beyond our control. There can be no assurance that our business will generate cash flow from operations, or that additional capital will be available to us, in amounts sufficient to enable us to meet our debt payment obligations and to fund other liquidity needs. Additionally, events and circumstances may occur which would cause us to not be able to satisfy applicable draw-down conditions and access the additional loan amounts available under the Loan Agreement. If we are unable to generate sufficient cash flows to service our payment obligations or satisfy our covenants under the Loan Agreement, we may need to refinance, restructure, or amend the terms of our debt, sell assets, reduce or delay capital investments, or seek to raise additional capital. If we are unable to implement one or more of these alternatives, we may be unable to meet our debt payment obligations which could result in an event of default. If we default under the Loan Agreement, the Lenders may accelerate all of our repayment obligations and exercise all of their rights and remedies under the Loan Agreement and applicable law, including foreclosing on substantially all of our assets, which secure our obligations under the Loan Agreement, potentially requiring us to renegotiate the terms of our indebtedness on terms less favorable to us. Further, if we are liquidated, the Lenders' right to repayment would be senior to the rights of the holders of our common stock to receive any proceeds from the liquidation. The Loan Agreement includes events of default, including, but not limited to, nonpayment of principal, interest, fees or other amounts; material inaccuracy of a representation or warranty; failure to perform or observe covenants; cross-defaults with certain other indebtedness; bankruptcy and insolvency events; material monetary judgment defaults; the occurrence of a material adverse change; impairment of the Lenders' security interest in the collateral; and delisting of our common stock. Upon the occurrence of an event of default (subject, in certain cases, to notice and grace periods), obligations under the Loan Agreement may be accelerated, thereby requiring us to repay the loans immediately. Any declaration by the Lenders of an event of default could significantly harm our business and prospects and could cause the price of our common stock to decline. Additionally, if we raise any additional debt financing, the terms of such additional debt could further restrict our operating and financial flexibility.

Current wording

Our ability to meet our payment obligations under the Loan Agreement depends on our ability to generate significant cash flows or obtain external financing in the future. This, to some extent, is subject to market, economic, financial, competitive, legislative, and regulatory factors as well as other factors that are beyond our control. There can be no assurance that our business will generate cash flow from operations, or that additional capital will be available to us, in amounts sufficient to enable us to meet our debt payment obligations and to fund other liquidity needs. Additionally, events and circumstances may occur which would cause us to not be able to satisfy applicable draw-down conditions and access the additional loan amounts available under the Loan Agreement. If we are unable to generate sufficient cash flows to service our payment obligations or satisfy our covenants under the Loan Agreement, we may need to refinance, restructure, or amend the terms of our debt, sell assets, reduce or delay capital investments, or seek to raise additional capital. If we are unable to implement one or more of these alternatives, we may be unable to meet our debt payment obligations which could result in an event of default. If we default under the Loan Agreement, the Lenders may accelerate all of our repayment obligations and exercise all of their rights and remedies under the Loan Agreement and applicable law, including foreclosing on substantially all of our assets, which secure our obligations under the Loan Agreement, potentially requiring us to renegotiate the terms of our indebtedness on terms less favorable to us. Further, if we are liquidated, the Lenders' right to repayment would be senior to the rights of the holders of our common stock to receive any proceeds from the liquidation. The Loan Agreement includes events of default, including, but not limited to, nonpayment of principal, interest, fees or other amounts; material inaccuracy of a representation or warranty; failure to perform or observe covenants; cross-defaults with certain other indebtedness; bankruptcy and insolvency events; material monetary judgment defaults; the occurrence of a material adverse change; impairment of the Lenders' security interest in the collateral; and delisting of our common stock. Upon the occurrence of an event of default (subject, in certain cases, to notice and grace periods), obligations under the Loan Agreement may be accelerated, thereby requiring us to repay the loans immediately. Any declaration by the

Previous wording

Recent regulatory engagement regarding the Phase 3 ARCHER II trial design has established a global registration path for vonaprument in the U.S. and Europe. As a result, we are conducting ARCHER II, a global sham-controlled double-masked, Phase 3 trial. The single-study program will be analyzed as two sub-studies for the U.S. in accordance with the FDA’s two-trial recommendation. There can be no assurance that the FDA and comparable regulatory authorities will accept the data from our Phase 3 program or determine that it is sufficient to support approval.

Current wording

Recent regulatory engagement regarding the Phase 3 ARCHER II trial design has established a global registration path for vonaprument in the U.S. and Europe. As a result, we are conducting ARCHER II, a global sham-controlled double-masked, Phase 3 trial. The single-study program will be analyzed as two sub-studies for the U.S. in accordance with the FDA’s two-trial recommendation. In August 2026, we expanded the ARCHER II program to add a Month 24 dual primary endpoint, complementing the original Month 15 primary endpoint, and to launch an open-label extension, or OLE, study in which patients completing the Month 24 assessment will have the option to receive monthly vonaprument treatment. There can be no assurance that the FDA and comparable regulatory authorities will accept the data from our Phase 3 program, including the amended dual primary endpoint design or the OLE study, or that such data will be determined sufficient to support approval.

Previous wording

Conducting large Phase 3 trials in multiple jurisdictions is expensive and can take many years to complete, and we cannot guarantee that clinical trials will be conducted as planned or completed timely, if at all. Our timeline and costs for ARCHER II could be substantially longer and larger than we initially planned. We may need additional capital to complete the Phase 3 clinical program for vonaprument and may not be able to raise sufficient capital in a timely manner which could delay or prevent us from completing our clinical trial, prevent us from seeking FDA approval of vonaprument, if ever, and could delay or prevent commercialization of vonaprument.

Current wording

Conducting large Phase 3 trials in multiple jurisdictions is expensive and can take many years to complete, and we cannot guarantee that clinical trials will be conducted as planned or completed timely, if at all. Our timeline and costs for ARCHER II could be substantially longer and larger than we initially planned, including as a result of the recently added Month 24 primary endpoint and OLE study, which extend the trial's duration and increase its complexity. Under the dual primary endpoint design, ARCHER II may achieve statistical success at either the Month 15 or Month 24 timepoint. However, there is no assurance that either timepoint will show a statistically significant treatment effect, that the FDA, EMA or other regulators will agree that success at one timepoint is sufficient to support approval, or that the design amendment itself will not require additional discussion, data or time to align with regulators. We may need additional capital to complete the expanded Phase 3 clinical program and the OLE study for vonaprument and may not be able to raise sufficient capital in a timely manner which could delay or prevent us from completing our clinical trial, prevent us from seeking FDA approval of vonaprument, if ever, and could delay or prevent commercialization of vonaprument.

Previous wording

For example, we intend to seek FDA approval of tanruprubart for the treatment of patients with GBS. Our data package is based on completed placebo-controlled studies conducted in Southeast Asia. We filed a MAA with the EMA for tanruprubart for the treatment of GBS in January 2026, and we continue to engage with EU regulators through the MAA review process. Tanruprubart has been granted orphan designation from the EMA. Tanruprubart has also been granted Fast Track and orphan drug designation for the treatment of GBS from the FDA. The currently ongoing open-label FORWARD study in the U.S. and Europe, which is designed to broaden Western experience with tanruprubart, and we anticipate initial PK, PD, biomarker and functional data in the second half of 2026 to supplement our comprehensive data package for tanruprubart in GBS. Following such data, we plan to engage with the FDA with the goal of reaching alignment on the sufficiency of our current and supplemental data package and information supporting the generalizability of tanruprubart in Western patients for submission of a BLA in 2026. In our discussions to date with the FDA, the FDA has indicated that the generalizability package may not be sufficient to support BLA approval absent additional patient data. While we expect that the inclusion of U.S. and European results from the FORWARD study will support a BLA submission in GBS, it is possible the FDA determines that our current package is not sufficient or requires us to provide additional data in GBS patients that are not feasible to obtain. Our inability to satisfy such additional requirements by the FDA may result in the FDA failing to approve tanruprubart in GBS, which would prevent the commercialization of tanruprubart in GBS in the United States, and limit the size of our commercial market opportunity and our potential future revenues, and could otherwise have a material adverse effect on our business.

Current wording

For example, we intend to seek FDA approval of tanruprubart for the treatment of patients with GBS. Our data package is based on completed placebo-controlled studies conducted in Southeast Asia. We filed a MAA with the EMA for tanruprubart for the treatment of GBS in January 2026, and we continue to engage with EU regulators through the MAA review process. Tanruprubart has been granted orphan designation from the EMA. Tanruprubart has also been granted Fast Track and orphan drug designation for the treatment of GBS from the FDA. The currently ongoing open-label FORWARD study in the U.S. and Europe is designed to broaden Western experience with tanruprubart. Eighteen patients have been treated to date, representing a broad spectrum of disease from moderate to severe in both male and female patients ranging in age from 12 to 78 years old. Functional outcomes, complete target engagement and a generally well-tolerated safety profile were observed in FORWARD, consistent with Phase 3 and real-world evidence studies. FORWARD findings provide additional evidence of the consistency and reproducibility of tanruprubart treatment effect across a broad range of GBS patients with different disease neurotypes, severities, ages and geographies, which further strengthen our comprehensive data package for tanruprubart in GBS. We plan to engage with the FDA with the goal of reaching alignment on our submission of a biologics license application, or BLA, anticipated in the fourth quarter of 2026. In our discussions to date with the FDA, the FDA has indicated that the generalizability package may not be sufficient to support BLA approval absent additional patient data. While we expect that the inclusion of U.S. and European results from the FORWARD study will support a BLA submission in GBS, it is possible the FDA determines that our current package, including the FORWARD study results, is not sufficient or requires us to provide additional data in GBS patients that are not feasible to obtain. Our inability to satisfy such additional requirements by the FDA may result in the FDA failing to approve tanruprubart in GBS, which would prevent the commercialization of tanruprubart in GBS in the United States, and limit the size of our commercial market opportunity and our potential future revenues, and could otherwise have a material adverse effect on our business.

Previous wording

We have received Orphan Drug designation in the United States for tanruprubart for the treatment of GBS and HD and for the treatment of GBS in Europe from the EMA. Although we may seek Orphan product designation for some or all of our other product candidates, we may never receive such designations. Under the Orphan Drug Act, the FDA may designate a drug or biologic product as an Orphan Drug if it is intended to treat a rare disease or condition, defined as a patient population of fewer than 200,000 in the United States, or a patient population greater than 200,000 in the United States where there is no reasonable expectation that the cost of developing the drug will be recovered from sales in the United States. Orphan Drug designation must be requested before submitting a BLA, or new drug application, or NDA. In the EU, the EMA’s Committee for Orphan Medicinal Products, or COMP, grants Orphan

Current wording

We have received Orphan Drug designation in the United States for tanruprubart for the treatment of GBS and HD and for the treatment of GBS in Europe from the EMA. Although we may seek Orphan Drug designation for some or all of our other product candidates, we may never receive such designations. Under the Orphan Drug Act, the FDA may designate a drug or biologic product as an Orphan Drug if it is intended to treat a rare disease or condition, defined as a patient population of fewer than 200,000 in the United States, or a patient population greater than 200,000 in the United States where there is no reasonable expectation that the cost of developing the drug will be recovered from sales in the United States. Orphan Drug designation must be requested before submitting a BLA, or new drug application, or NDA. In the EU, the EMA’s Committee for Orphan Medicinal Products, or COMP, grants Orphan Drug designation to promote the development of products that are intended for the diagnosis, prevention or treatment of a life-threatening or chronically debilitating condition affecting not more than five in 10,000 persons in the EU. Additionally, designation is granted for products intended for the diagnosis, prevention or treatment of a life-threatening, seriously debilitating or serious and chronic condition when, without incentives, it is unlikely that sales of the drug in the EU would be sufficient to justify the necessary investment in developing the drug or biological product or where there is no satisfactory method of diagnosis, prevention or treatment, or, if such a method exists, the medicine must be of significant benefit to those affected by the condition.

Previous wording

In particular, where data from foreign clinical trials are intended to serve as the sole basis for marketing approval in the United States, regardless of whether such trials were conducted under an IND, the FDA will not approve the application on the basis of foreign data alone unless those data are applicable to the United States population and United States medical practice, the trials were performed by clinical investigators of recognized competence and the data are considered valid without the need for an on-site inspection by the FDA or, if the FDA considers such an inspection to be necessary, the FDA is able to validate the data through an on-site inspection or other appropriate means. For trials that are conducted only at sites outside of the United States and not subject to an IND, the FDA requires the clinical trial to have been conducted in accordance with good clinical practice, or GCP, requirements, and the FDA must be able to validate the data from the clinical trial through an on-site inspection if it deems such inspection necessary. Additionally, the

Current wording

In particular, where data from foreign clinical trials are intended to serve as the sole basis for marketing approval in the United States, regardless of whether such trials were conducted under an IND, the FDA will not approve the application on the basis of foreign data alone unless those data are applicable to the United States population and United States medical practice, the trials were performed by clinical investigators of recognized competence and the data are considered valid without the need for an on-site inspection by the FDA or, if the FDA considers such an inspection to be necessary, the FDA is able to validate the data through an on-site inspection or other appropriate means. For trials that are conducted only at sites outside of the United States and not subject to an IND, the FDA requires the clinical trial to have been conducted in accordance with good clinical practice, or GCP, requirements, and the FDA must be able to validate the data from the clinical trial through an on-site inspection if it deems such inspection necessary. Additionally, the FDA’s clinical trial requirements, including sufficient size of patient populations and statistical powering, must be met. Many foreign regulatory bodies have similar approval requirements. In addition, foreign trials are subject to the applicable local laws of the foreign jurisdictions where the trials are conducted. There can be no assurance that the FDA, EMA or any comparable foreign regulatory authority will accept data from trials conducted outside of the United States or the applicable jurisdiction. If the FDA or any comparable foreign regulatory authority does not accept such data, it would result in the need for additional trials or the amendment of ongoing trials, which would be costly and time-consuming and delay aspects of our business plan or receiving approval or clearance for commercialization in the applicable jurisdiction.

Previous wording

To support data from clinical trials conducted in foreign jurisdictions, applicants may submit clinical evidence, clinical trials, patient registries or other sources of RWE, such as electronic health records or the collection of larger confirmatory data sets. In particular, because all of our studies to date for tanruprubart in GBS have been conducted at sites outside the United States, we conducted a RWE study to assess comparability of disease populations in the US and ex-US using a large natural history database from IGOS. Published data from IGOS presents baseline characteristics of GBS patients in various jurisdictions and patient outcomes at certain timepoints over the course of their disease. We filed a MAA with the EMA for tanruprubart for the treatment of GBS in January 2026, and we continue to engage with EU regulators through the MAA review process. Tanruprubart has been granted orphan designation from the EMA. Tanruprubart has also been granted Fast Track and orphan drug designation for the treatment of GBS from the FDA. The currently ongoing open-label U.S./EU FORWARD study in the U.S. and Europe which is designed to broaden Western experience with tanruprubart, and we anticipate initial PK, PD, biomarker and functional data in 2026 to supplement our comprehensive data package for tanruprubart in GBS. Following such data, we plan to engage with the FDA with the goal of reaching alignment on our current and supplemental data package and information supporting the generalizability of tanruprubart in Western patients for submission of a BLA in 2026. In our discussions with the FDA, the FDA has indicated that the generalizability package may not be sufficient to support BLA approval absent additional patient data. While we expect that the inclusion of U.S. and European results from the FORWARD study will support a BLA submission in GBS, it is possible the FDA determines that our current package is not sufficient or requires us to provide additional data in GBS patients that are not feasible to obtain. Our inability to satisfy such additional requirements by the FDA may result in the FDA failing to approve tanruprubart in GBS, which would prevent the commercialization of tanruprubart in GBS in the United States, and limit the size of our commercial market opportunity and our potential future revenues, and could otherwise have a material adverse effect on our business.

Current wording

To support data from clinical trials conducted in foreign jurisdictions, applicants may submit clinical evidence, clinical trials, patient registries or other sources of RWE, such as electronic health records or the collection of larger confirmatory data sets. In particular, because all of our studies to date for tanruprubart in GBS have been conducted at sites outside the United States, we conducted a RWE study to assess comparability of disease populations in the US and ex-US using a large natural history database from IGOS. Published data from IGOS presents baseline characteristics of GBS patients in various jurisdictions and patient outcomes at certain timepoints over the course of their disease. We filed a MAA with the EMA for tanruprubart for the treatment of GBS in January 2026, and we continue to engage with EU regulators through the MAA review process. Tanruprubart has been granted orphan designation from the EMA. Tanruprubart has also been granted Fast Track and orphan drug designation for the treatment of GBS from the FDA. The currently ongoing open-label U.S./EU FORWARD study in the U.S. and Europe is designed to broaden Western experience with tanruprubart. Eighteen patients have been treated to date, representing a broad spectrum of disease from moderate to severe in both male and female patients ranging in age from 12 to 78 years old. Functional outcomes, complete target engagement and a generally well-tolerated safety profile were observed in FORWARD, consistent with Phase 3 and real-world evidence studies. FORWARD findings provide additional evidence of the consistency and reproducibility of tanruprubart treatment effect across a broad range of GBS patients with different disease neurotypes, severities, ages and geographies, which further strengthen our comprehensive data package for tanruprubart in GBS. We plan to engage with the FDA with the goal of reaching alignment on our submission of a biologics license application, or BLA, anticipated in the fourth quarter of 2026. In our discussions with the FDA, the FDA has indicated that the generalizability package may not be sufficient to support BLA approval absent additional patient data. While we expect that the inclusion of U.S. and European results from the FORWARD study will support a BLA submission in GBS, it is possible the FDA determines that our current package, including the FORWARD study results, is not sufficient or requires us to provide additional data in GBS patients that are not feasible to obtain. Our inability to satisfy such additional requirements by the FDA may result in the FDA failing to approve tanruprubart in GBS, which would prevent the commercialization of tanruprubart in GBS in the United States, and limit the size of our commercial market opportunity and our potential future revenues, and could otherwise have a material adverse effect on our business.

Previous wording

We have not yet engaged any manufacturers for the commercial supply of our product candidates. Although we intend to enter into such agreements prior to commercial launch of any of our product candidates, we may be unable to enter into any such agreement or do so on commercially reasonable terms, which could have a material adverse impact upon our business. Moreover, if there is a disruption to one or more of our third-party manufacturers’ or suppliers’ relevant operations, or if we are unable to enter into arrangements for the commercial supply of our product candidates, we will have no other means of producing our product candidates until they restore the affected facilities or we or they procure alternative manufacturing facilities or sources of supply. Our ability to progress our preclinical and clinical programs could be materially and adversely impacted if any of the third-party suppliers upon which we rely were to experience a significant business challenge, disruption or failure due to issues such as financial difficulties or bankruptcy, issues relating to other customers such as regulatory or quality compliance issues, or other financial, legal, regulatory or reputational issues. Additionally, any damage to or destruction of our third-party manufacturers’ or suppliers’ facilities or equipment may significantly impair our ability to manufacture our product candidates on a timely basis.

Current wording

We have initiated discussions with contract manufacturers for the commercial supply of our product candidates. Although we intend to enter into such agreements prior to commercial launch of any of our product candidates, we may be unable to enter into any such agreement or do so on commercially reasonable terms, which could have a material adverse impact upon our business. Moreover, if there is a disruption to one or more of our third-party manufacturers’ or suppliers’ relevant operations, or if we are unable to enter into arrangements for the commercial supply of our product candidates, we will have no other means of producing our product candidates until they restore the affected facilities or we or they procure alternative manufacturing facilities or sources of supply. Our ability to progress our preclinical and clinical programs could be materially and adversely impacted if any of the third-party suppliers upon which we rely were to experience a significant business challenge, disruption or failure due to issues such as financial difficulties or bankruptcy, issues relating to other customers such as regulatory or quality compliance issues, or other financial, legal, regulatory or reputational issues. Additionally, any damage to or destruction of our third-party manufacturers’ or suppliers’ facilities or equipment may significantly impair our ability to manufacture our product candidates on a timely basis.

Previous wording

We currently do not have a marketing or sales organization. In order to commercialize our product candidates in the United States and foreign jurisdictions, we must build our marketing, sales, distribution, managerial and other non-technical capabilities or make arrangements with third parties to perform these services, and we may not be successful in doing so. If any of our product candidates receive regulatory approval, we expect to establish a sales organization with technical expertise and supporting distribution capabilities to commercialize each such product candidate, which will be expensive and time consuming. We have no prior experience in the marketing, sale and distribution of pharmaceutical, biopharmaceutical and biotechnology products, and there are significant risks involved in building and managing a sales organization, including our ability to hire, retain and incentivize qualified individuals, generate sufficient sales leads, provide adequate training to sales and marketing personnel and effectively manage a geographically dispersed sales and marketing team. Any failure or delay in the development of our internal sales, marketing and distribution capabilities would adversely impact the commercialization of these products. We may choose to collaborate with third parties that have direct sales forces and established distribution systems, either to augment our own sales force and distribution systems or in lieu of our own sales force and distribution systems. If we are unable to enter into such arrangements on acceptable terms or at all, we may not be able to successfully commercialize our product candidates. If we are not successful in commercializing our product candidates or any future product candidates, either on our own or through arrangements with one or more third parties, we may not be able to generate any future product revenue and we would incur significant additional losses.

Current wording

We currently do not have a marketing or sales organization. In order to commercialize our product candidates in the United States and foreign jurisdictions, we must build our marketing, sales, distribution, managerial and other non-technical capabilities or make arrangements with third parties to perform these services, and we may not be successful in doing so. We have no prior experience in the marketing, sale and distribution of pharmaceutical, biopharmaceutical and biotechnology products, and there are significant risks involved in building and managing a sales organization, including our ability to hire, retain and incentivize qualified individuals, generate sufficient sales leads, provide adequate training to sales and marketing personnel and effectively manage a geographically dispersed sales and marketing team. Any failure or delay in the development of our internal sales, marketing and distribution capabilities would adversely impact the commercialization of these products. To build on our current resources and limited commercial experience, we intend to establish third-party relationships to successfully commercialize our products. The near and long-term commercial viability of our product candidates, if approved, may depend, in part, on our ability to successfully establish strategic collaborations with contract commercial organizations, pharmaceutical and biotechnology companies, non-profit organizations, and government agencies. Establishing and maintaining strategic collaborations is difficult and time-consuming. Potential collaborators may reject collaborations based upon their assessment of our financial, regulatory or intellectual property position or based on their internal pipeline or available resources. If we are unable to enter into such arrangements on acceptable terms or at all, we may not be able to successfully commercialize our product candidates. Even if we enter into collaborations with contract commercial organizations, there can be no assurances that it will ever result in the successful commercialization of any products for several reasons, including that:

Previous wording

As of June 30, 2026, we had 92 full-time employees. We will need to continue to expand our managerial, operational, finance and other resources in order to manage our operations and clinical trials, continue our development activities and commercialize our product candidates or any future product candidates. Our management and personnel, systems and facilities currently in place may not be adequate to support our growth. Our need to effectively execute our growth strategy requires that we:

Current wording

As of September 30, 2026, we had 97 full-time employees. We will need to continue to expand our managerial, operational, finance and other resources in order to manage our operations and clinical trials, continue our development activities and commercialize our product candidates or any future product candidates. Our management and personnel, systems and facilities currently in place may not be adequate to support our growth. Our need to effectively execute our growth strategy requires that we:

Previous wording

As of June 30, 2026, our executive officers, directors, holders of 5% or more of our capital stock and their respective affiliates beneficially owned 47% of our outstanding voting stock. In addition, in our 2023, 2024, and 2025, financings, certain of the holders of 5% or more of our capital stock acquired pre-funded warrants to purchase shares of our common stock (which are immediately exercisable and have an exercise price of $0.001 per share) or common warrants to purchase shares of our common stock. Until exercised, the shares issuable upon the exercise of the pre-funded warrants and the common warrants are not included in the number of our outstanding shares of common stock. If such holders exercise their warrants, then the shares of our capital stock beneficially owned by our executive officers, directors, holders of 5% or more of our capital stock and their respective affiliates would increase significantly. Therefore, these stockholders will have the ability to influence us through this ownership position. These stockholders may be able to determine all matters requiring stockholder approval. For example, these stockholders may be able to control elections of directors, amendments of our organizational documents, or approval of any merger, sale of assets or other major corporate transaction. This may prevent or discourage unsolicited acquisition proposals or offers for our common stock that you may feel are in your best interest as one of our stockholders.

Current wording

As of September 30, 2026, our executive officers, directors, holders of 5% or more of our capital stock and their respective affiliates beneficially owned 43% of our outstanding voting stock. In addition, in our 2023, 2024, and 2025, financings, certain of the holders of 5% or more of our capital stock acquired pre-funded warrants to purchase shares of our common stock (which are immediately exercisable and have an exercise price of $0.001 per share) or common warrants to purchase shares of our common stock. Until exercised, the shares issuable upon the exercise of the pre-funded warrants and the common warrants are not included in the number of our outstanding shares of common stock. If such holders exercise their warrants, then the shares of our capital stock beneficially owned by our executive officers, directors, holders of 5% or more of our capital stock and their respective affiliates would increase significantly. Therefore, these stockholders will have the ability to influence us through this ownership position. These stockholders may be able to determine all matters requiring stockholder approval. For example, these stockholders may be able to control elections of directors, amendments of our organizational documents, or approval of any merger, sale of assets or other major corporate transaction. This may prevent or discourage unsolicited acquisition proposals or offers for our common stock that you may feel are in your best interest as one of our stockholders.

Previous wording

We may from time to time issue additional shares of common stock, and as a result, our stockholders would experience immediate dilution. In addition, as opportunities present themselves, we may enter into financing or similar arrangements in the future, including the issuance of debt securities, preferred stock or common stock. For example, in March 2024, we entered into a sales agreement with TD Cowen, as sales agent, pursuant to which we sold approximately $66.7 million of shares of our common stock under an at the market offering program as of the date of this Quarterly Report on Form 10-Q. In March 2026, we entered into a new sales agreement with TD Cowen, as sales agent, pursuant to which we may issue and sell shares of our common stock for an aggregate maximum offering price of up to $150 million under a new at-the-market offering program. As of the filing date of this Quarterly Report on Form 10-Q, we had sold $32.2 million of common stock under the program. In addition, in December 2023, June 2024, and November 2025, we closed financings which included the sale of pre-funded warrants to purchase shares of our common stock. Until exercised, the shares issuable upon the exercise of the pre-funded warrants are not included in the number of our outstanding shares of common stock. If we issue common stock or securities convertible into common stock in the future, our stockholders would experience additional dilution and such dilutive impact may be difficult to compute.

Current wording

We may from time to time issue additional shares of common stock, and as a result, our stockholders would experience immediate dilution. In addition, as opportunities present themselves, we may enter into financing or similar arrangements in the future, including the issuance of debt securities, preferred stock or common stock. For example, in March 2024, we entered into a sales agreement with TD Cowen, as sales agent, pursuant to which we sold approximately $66.7 million of shares of our common stock under an at the market offering program as of the date of this Quarterly Report on Form 10-Q. In March 2026, we entered into a new sales agreement with TD Cowen, as sales agent, pursuant to which we may issue and sell shares of our common stock for an aggregate maximum offering price of up to $150 million under a new at-the-market offering program. As of the filing date of this Quarterly Report on Form 10-Q, we had sold $37.5 million of common stock under the program. In addition, in December 2023, June 2024, and November 2025, we closed financings which included the sale of pre-funded warrants to purchase shares of our common stock. Until exercised, the shares issuable upon the exercise of the pre-funded warrants are not included in the number of our outstanding shares of common stock. If we issue common stock or securities convertible into common stock in the future, our stockholders would experience additional dilution and such dilutive impact may be difficult to compute.

Previous wording

If our existing stockholders sell, or indicate an intention to sell, substantial amounts of our common stock in the public market, the stock price of our common stock could decline. As of June 30, 2026, the number of shares of our common stock outstanding was 174,604,198. This number does not include 29,765,799 shares of common stock issuable upon the exercise of pre-funded warrants. On August 12, 2024, we filed a resale registration statement on Form S-3, pursuant to which, entities and trusts affiliated with Muneer Satter, a member of our board of directors, can sell up to 3,000,000 shares of common stock. Sales of a substantial number of shares of our common stock in the public market, or the perception that these sales might occur, may reduce the stock price of our common stock.

Current wording

If our existing stockholders sell, or indicate an intention to sell, substantial amounts of our common stock in the public market, the stock price of our common stock could decline. As of September 30, 2026, the number of shares of our common stock outstanding was 190,092,719. This number does not include 14,865,799 shares of common stock issuable upon the exercise of pre-funded warrants. Sales of a substantial number of shares of our common stock in the public market, or the perception that these sales might occur, may reduce the stock price of our common stock.

Previous wording

foreign data protection laws, including the European Union’s General Data Protection Regulation, or EU GDPR, and the United Kingdom GDPR, or UK GDPR, and laws of other jurisdictions in which we have in the past, presently or may in the future conduct clinical trials (such as Australia, Canada, and New Zealand), which contain provisions specifically directed at the processing of personal data and, more broadly, impose significant and complex compliance burdens on processing personal data. Under the EU and UK GDPR, government regulators may impose temporary or definitive bans on data processing, as well as fines for noncompliance of up to €20 million under the EU GDPR (£17.5 million under the UK GDPR) or 4% of annual global revenue of the noncompliance company, whichever is greater. Noncompliance with the EU and UK GDPR could also result in private litigation related to the processing of personal data brought by classes of data subjects or consumer protection organizations authorized at law to represent their interests. These laws such as the EU and UK GDPR impose numerous requirements for the collection, use, storage and disclosure of personal data of data subjects, including requirements relating to providing notice to and obtaining consent from data subjects, personal data breach notification, cross-border transfers of personal data, and honoring and providing for the rights of individuals in relation to their personal data, including the right to access, correct and delete their data. Among other requirements, the EU and UK GDPR regulate transfers of personal data subject to the EU and UK GDPR to third countries that have not been found to provide adequate protection to such personal data, including the United States, and the efficacy and longevity of current transfer mechanisms between the EU and the United States remains uncertain.

Current wording

foreign data protection laws, including the European Union’s General Data Protection Regulation, or EU GDPR, and the United Kingdom GDPR, or UK GDPR, and laws of other jurisdictions in which we have in the past, presently or may in the future conduct clinical trials (such as Australia, Canada, and New Zealand), which contain provisions specifically directed at the processing of personal data and, more broadly, impose significant and complex compliance burdens on processing personal data. Under the EU and UK GDPR, government regulators may impose temporary or definitive bans on data processing, as well as fines for noncompliance of up to €20 million under the EU GDPR (£17.5 million under the UK GDPR) or 4% of annual global revenue of the noncompliant company, whichever is greater. Noncompliance with the EU and UK GDPR could also result in private litigation related to the processing of personal data brought by classes of data subjects or consumer protection organizations authorized at law to represent their interests. These laws such as the EU and UK GDPR impose numerous requirements for the collection, use, storage and disclosure of personal data of data subjects, including requirements relating to providing notice to and obtaining consent from data subjects, personal data breach notification, cross-border transfers of personal data, and honoring and providing for the rights of individuals in relation to their personal data, including the right to access, correct and delete their data. Among other requirements, the EU and UK GDPR regulate transfers of personal data subject to the EU and UK GDPR to third countries that have not been found to provide adequate protection to such personal data, including the United States, and the efficacy and longevity of current transfer mechanisms between the EU and the United States remains uncertain.