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Annexon, Inc.

For the period ended Mar 31, 2026. Filed May 7, 2026.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Mar 31, 2026 · Filed May 7, 2026

ANNX$4.23+0.7%Stored close · as of Nov 9, 2026

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Item 5. Other Information

2024 ATM Program

As previously disclosed, on March 26, 2024, we entered into a Sales Agreement, or Sales Agreement, with TD Cowen, pursuant to which we from time to time could offer and sell shares of its common stock through or to TD Cowen having an aggregate offering price of up to $100.0 million. On May 6, 2026, we and TD Cowen mutually agreed to terminate the Sales Agreement with immediate effect in accordance with the terms of the Sales Agreement. Accordingly, no further offers or sales will be conducted under the Sales Agreement. Prior to such termination, we sold shares of our common stock with an aggregate gross sales price of approximately $66.7 million under the Sales Agreement.

The foregoing description of the Sales Agreement does not purport to be complete and is qualified in its entirety by reference to the copy of the Sales Agreement filed as Exhibit 1.2 to the Company’s Registration Statement on Form S-3 filed on March 26, 2024.

Insider Trading

During the three months ended March 31, 2026, none of our directors or officers (as defined in Rule 16a-1(f) under the Exchange Act) adopted or terminated any “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Item 408 of Regulation S-K.

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