Annexon, Inc. — Director's Dealing 2021

Jun 1, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Annexon, Inc. (ANNX)
CIK: 0001528115
Period of Report: 2021-05-27

Reporting Person: Lew Jennifer (EVP & Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-27	Common Stock	M	3500	$7.4885	Acquired	5500	Direct
2021-05-27	Common Stock	S	3500	$22.2386	Disposed	2000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-27	Stock Option (Right to Buy)	$7.4885	M	3500	Disposed	2029-06-20	Common Stock (3500)	Direct

Footnotes

F1: The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan.

F2: This transaction was executed in multiple trades in prices ranging from $21.78 to $22.67, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

F3: 25% of the shares subject to the option vest on the first anniversary measured from June 3, 2019 (the "Vesting Commencement Date"), and 1/48th of the total number of shares vest monthly thereafter, such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date.