Satter Muneer A. - 28 May 2026 Form 4 Insider Report for Annexon, Inc. (ANNX)

Reporting relationship: Director
Issuer ticker: ANNX
Reported as of: 28 May 2026
Net transaction value: +$3,319,019
SEC form: 4
Accepted by SEC: 29 May 2026, 17:21:02 UTC
Prior SEC filing: 21 Nov 2025
Next SEC filing: 15 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Muneer A. Satter

Key filing fact

Satter Muneer A. filed Form 4 for Annexon, Inc. (ANNX) on 29 May 2026.

Key facts

This page summarizes Satter Muneer A.'s Form 4 filing for Annexon, Inc. (ANNX).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 29 May 2026, 17:21.

Change

Previous filing in this sequence was filed on 21 Nov 2025.
Current net transaction value: +$3,319,019.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001315797 Primary reporting owner

Satter Muneer A

Relationship: Director
Address: C/O ANNEXON, INC., 1400 SIERRA POINT PKWY, BLDG C, STE 200, BRISBANE
Signature: /s/ Muneer A. Satter
Signature date: 29 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ANNX transaction

Common Stock

Purchase

Transaction value: $3,319,019
Shares: +613,497
Change %: +6.3%
Price: $5.41
Shares after: 10,342,134
Date: 28 May 2026
Ownership: See footnote
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

All shares were purchased by Alerce Medical Technology Partners, L.P. ("Alerce Medical"). The Reporting Person has sole voting and dispositive power over the shares held by Alerce Medical. The Reporting Person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest therein.

Footnote F2

As of May 28, 2026, includes (a) 240,000 shares that are held by the Muneer A. Satter Revocable Trust for which the Reporting Person serves as trustee and, in such capacity, has sole voting and dispositive power over all such shares, (b) 567,240 shares that are held by various other trusts and entities for which the Reporting Person serves as trustee, investment advisor or manager, as applicable, and, in each such capacity, has sole voting and dispositive power over all such shares, (c) 1,147,738 shares that are held by Satter Medical Technology Partners, L.P. for which the Reporting Person has sole voting and dispositive power over all such shares and (d) 8,387,156 shares that are held by Alerce Medical for which the Reporting Person has sole voting and dispositive power over all such shares. The Reporting Person disclaims beneficial ownership of all shares included under (b), (c) and (d) of this footnote, except to the extent of his pecuniary interest therein.