Annexon (ANNX) Announces Proposed $125M Share Offering

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 announced that it has commenced an underwritten public offering of $125 million of shares of its common stock. All of the shares are being offered by Annexon. In addition, Annexon expects to grant the underwriters a 30-day option to purchase up to an additional $18.750 million of shares of its common stock. The proposed offering is subject to market and other conditions, and there can be no assurance as to whether or when the proposed offering may be completed, or as to the actual size or terms of the proposed offering.

J.P. Morgan, Jefferies, TD Cowen, BofA Securities and Wells Fargo Securities are acting as joint book-running managers for the proposed offering.

The shares are being offered by Annexon pursuant to a shelf registration statement on Form S-3, including a base prospectus, that was filed with the Securities and Exchange Commission (SEC) and declared effective by the SEC on April 1, 2024. The proposed offering is being made only by means of a prospectus supplement and the accompanying prospectus that will form a part of the registration statement. A preliminary prospectus supplement and the accompanying prospectus relating to the proposed offering will be filed with the SEC and will be available on the SEC’s website at www.sec.gov. Copies of the preliminary prospectus supplement and the accompanying prospectus, when available, may be obtained from: J.P. Morgan Securities LLC, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717 or by email at [email protected] and [email protected]; or Jefferies LLC, Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, New York, NY 10022, by telephone at (877) 547-6340, or by email at [email protected]; or TD Securities (USA) LLC, 1 Vanderbilt Avenue, New York, NY 10017, by telephone at (855) 495-9846, or by email at [email protected]; BofA Securities NC1-022-02-25, 201 North Tryon Street, Charlotte, NC 28255, Attn: Prospectus Department, or by email at [email protected]; or Wells Fargo Securities, 90 South 7th Street, 5th Floor, Minneapolis, MN 55402, by telephone at 800-645-3751 (option #5) or by email at [email protected]. The final terms of the proposed offering will be disclosed in a final prospectus supplement to be filed with the SEC.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

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