UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-39402 ANNEXON, INC. (Exact name of Registrant as specified in its Charter) Delaware 27-5414423 (State or other jurisdiction of i ...

Accelerated Enrollment in Phase 3 ARCHER II Trial on Pace for Completion in Third Quarter 2025 for ANX007, the First Potential Treatment for Dry AMD with GA; Pivotal Topline Data Expected in the Second Half of 2026 Completion of Proof-of-Concept Trial for First-in-Kind Oral C1s Inhibitor ANX1502 in Cold Agglutin Disease Anticipated Mid-2025; Potential to Disrupt the Current Treatment of Antibody-Mediated Autoimmune Diseases $263.7 million in Cash, Cash Equivalents, and Short-term Investments as of March 31, ...

FDA Meeting for Tanruprubart (formerly ANX005), the First Potential Targeted Therapy for GBS, Scheduled for Second Quarter 2025 Ahead of Planned BLA Submission Open-Label Tanruprubart FORWARD Study Designed to Broaden Patient and Healthcare Community Experience in North America and Europe, Initiating in Second Quarter 2025 Accelerated Enrollment in Phase 3 ARCHER II Trial on Pace for Completion in Third Quarter 2025 for ANX007, the First Potential Treatment for Dry AMD with GA; Pivotal Topline Data Expected ...

First Oral Presentation by the International Guillain-Barré Syndrome Outcomes Study (IGOS) of the Real-World Evidence (RWE) Results Showing Improved Outcomes with Tanruprubart (formerly ANX005) Compared to Current Standards of Care in Matched Patient Populations New Analyses of Phase 3 Trial Highlight Tanruprubart’s Early and Durable Treatment Effect and Improvement in Quality of Life in Patients with GBS BRISBANE, Calif., May 09, 2025 (GLOBE NEWSWIRE) -- Annexon, Inc. (Nasdaq: ANNX), a biopharmaceutical co ...

Phase 2 ARCHER Data Support Therapeutic Potential for ANX007 to Preserve Vision in Patients who have Dry Age-related Macular Degeneration (AMD) with Geographic Atrophy (GA) Phase 3 ARCHER II Trial Enrolling Globally BRISBANE, Calif., May 07, 2025 (GLOBE NEWSWIRE) -- Annexon, Inc. (Nasdaq: ANNX), a biopharmaceutical company advancing a late-stage clinical platform of novel therapies for people living with devastating classical complement-mediated neuroinflammatory diseases of the body, brain, and eye, today ...

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Oral Presentation Features Phase 3 Data Showing Rapid Recovery and Durable Benefit of Tanruprubart (formerly ANX005) on Clinically Meaningful Measures across Multiple Stages of GBS Disease Education Campaign for Healthcare Providers called Move GBS Forward™ (MoveGBSForward.com) Highlights Life-altering Impact of GBS BRISBANE, Calif., April 08, 2025 (GLOBE NEWSWIRE) -- Annexon, Inc. (Nasdaq: ANNX), a biopharmaceutical company advancing a late-stage clinical platform of novel therapies for people living with ...

Oral Plenary Presentation on Tuesday, April 8 Features Phase 3 Data for ANX005, the First Potential Targeted Therapy for GBS, Showing Rapid and Durable Benefit Across Clinical Measures and Time Points Educational Symposium Focuses on Advancing GBS Care and Role of Classical Complement Pathway New Disease Education Campaign “Move GBS Forward” Draws Attention to Life-altering Physical and Mental Impact of GBS BRISBANE, Calif., April 03, 2025 (GLOBE NEWSWIRE) -- Annexon, Inc. (Nasdaq: ANNX), a biopharmaceutic ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 001-39402 ANNEXON, INC. (Exact name of Registrant as specified in its Charter) (State or other jurisdiction of incorporation or organizat ...

Exhibit 99.1 Annexon Reports Fourth Quarter and Year-End 2024 Financial Results, Portfolio Progress and Key Anticipated Milestones Robust, Consistent Phase 3 Data and Real-World Evidence Outcomes Support ANX005 as Potential First Targeted Therapy for GBS; Pre-BLA Meeting Targeted for 1H 2025 Ahead of Planned Biologics License Application (BLA) Submission Established Groundbreaking Global Registration Path for ANX007 to be Potential First Vision-Preserving Treatment for Dry AMD with GA in Europe and U.S.; To ...