SC 13G/A: Annexon, Inc.

AI Summary

SC 13G/A filing by Annexon, Inc..

Risk Assessment

Risk Level: low

Key Financial Figures

• $0.001 — me of Issuer) Common Stock, Par Value $0.001 (Title of Class of Securities) 0358

Filing Documents

• tm245759d1_sc13ga.htm (SC 13G/A) — 117KB
• 0001104659-24-023528.txt ( ) — 118KB

From the Filing

SC 13G/A 1 tm245759d1_sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* ANNEXON, INC. (Name of Issuer) Common Stock, Par Value $0.001 (Title of Class of Securities) 03589W102 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of This Check the appropriate box to designate the rule pursuant to which this Schedule is filed: Rule 13d-1(b) Rule 13d-1(c) Rule 13d-1(d) * The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). CUSIP No. 03589W102 1. Names of Reporting Persons I.R.S. Identification No. of Above Persons (Entities Only) Fairmount Funds Management LLC 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) ¨ (b) ¨ 3. SEC Use Only 4. Citizenship or Place of Organization Delaware Number of Shares Beneficially Owned by Each Reporting Person With 5. Sole Voting Power 0 6. Shared Voting Power 322,893 (1) 7. Sole Dispositive Power 0 8. Shared Dispositive Power 322,893 (1) 9. Aggregate Amount Beneficially Owned by Each Reporting Person 322,893 (1) 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) ¨ 11. Percent of Class Represented by Amount in Row (9) 0.4% (2) 12. Type of Reporting Person (See Instructions) IA (1) The shares reported herein for the Reporting Person represent 322,893 shares of the Issuer’s Common Stock issuable upon the exercise of common warrants (“Common Warrants”) held by Fairmount Healthcare Fund II LP. (2) The number of shares outstanding for purposes of this percentage calculation assumes 78,338,098 shares of the Issuer’s Common Stock outstanding as disclosed in the prospectus (Form 424B5) filed by the Issuer with the Securities and Exchange Commission on December 21, 2023. CUSIP No. 03589W102 1. Names of Reporting Persons I.R.S. Identification No. of Above Persons (Entities Only) Peter Harwin 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) ¨ (b) ¨ 3. SEC Use Only 4. Citizenship or Place of Organization United States Number of Shares Beneficially Owned by Each Reporting Person With 5. Sole Voting Power 0 6. Shared Voting Power 322,893 (1) 7. Sole Dispositive Power 0 8. Shared Dispositive Power 322,893 (1) 9. Aggregate Amount Beneficially Owned by Each Reporting Person 322,893 (1) 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) ¨ 11. Percent of Class Represented by Amount in Row (9) 0.4% (2) 12. Type of Reporting Person (See Instructions) HC, IN (1) The shares reported herein for the Reporting Person represent 322,893 shares of the Issuer’s Common Stock issuable upon the exercise of common warrants (“Common Warrants”) held by Fairmount Healthcare Fund II LP. (2) The number of shares outstanding for purposes of this percentage calculation assumes 78,338,098 shares of the Issuer’s Common Stock outstanding as disclosed in the prospectus (Form 424B5) filed by the Issuer with the Securities and Exchange Commission on December 21, 2023. CUSIP No. 03589W102 1. Names of Reporting Persons I.R.S. Identification No. of Above Persons (Entities Only) Tomas Kiselak 2. Check the Appropriate Box if a Member of a Group (See Instructions) (a) ¨ (b) ¨ 3. SEC Use Only 4. Citizenship or Place of Organization Slovak Republic Number of Shares Beneficially Owned by Each Reporting Person With 5. Sole Voting Power 0 6. Shared Voting Power 322,893 (1) 7. Sole Dispositive Power 0 8. Shared Dispositive Power 322,893 (1) 9. Aggregate Amount Beneficially Owned by Each Reporting Person 322,893 (1) 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) ¨ 11. Percent of Class Represented by Amount in Row (9) 0.4% (2) 12. Type of Reporting Person (See Instructions) HC, IN (1) The shares reported herein for the Reporting Person represent 322,893 shares of the Issuer’s Common Stock issuable upon the exercise of common warrants (“Common Warrants”) held by Fairmount Healthcare Fund II LP. (2) The number of shares outstanding for purposes of this per

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