Mark S. Blumenkranz - 10 Aug 2026 Form 4 Insider Report for Annexon, Inc. (ANNX)

Reporting relationship: Director
Issuer ticker: ANNX
Reported as of: 10 Aug 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 12 Aug 2026, 18:10:26 UTC
Prior SEC filing: 12 Jun 2024
Source filing: View source filing
Reporting owner signature: /s/ Jennifer Lew, Attorney-in-Fact

Key filing fact

Mark S. Blumenkranz filed Form 4 for Annexon, Inc. (ANNX) on 12 Aug 2026.

Key facts

This page summarizes Mark S. Blumenkranz's Form 4 filing for Annexon, Inc. (ANNX).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 12 Aug 2026, 18:10.

Change

Previous filing in this sequence was filed on 12 Jun 2024.
Current net transaction value: $0.

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 0001614869 Primary reporting owner

Blumenkranz Mark S.

Relationship: Director
Address: C/O ANNEXON, INC., 1400 SIERRA POINT PKWY, BLDG C, STE 200, BRISBANE
Signature: /s/ Jennifer Lew, Attorney-in-Fact
Signature date: 12 Aug 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ANNX transaction Derivative

Stock Option (Right to Buy)

Award

Transaction value
Shares: +175,000
Change %
Price: $0.000000^*
Shares after: 175,000
Date: 10 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 175,000
Exercise price: $5.39
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

1/36th of the shares subject to the option vest on each monthly anniversary measured from August 10, 2026 (the "Vesting Commencement Date"), such that 100% of the shares subject to the option will be fully vested and exercisable on the third anniversary of the Vesting Commencement Date, subject to Reporting Person's continuous service as a director on each such vesting date.