SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Satter Muneer A (Last) (First) (Middle) C/O ANNEXON, INC. 180 KIMBALL WAY, SUITE 200 (Street) SOUTH SAN FRANCISCO CA 94080 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Annexon, Inc. [ ANNX ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 07/28/2020
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/28/2020		C		1,754,978(1)	A	(1)	1,754,978	I	See footnote(5)
Common Stock	07/28/2020		P		200,000(6)	A	$17	1,954,978	I	See footnote(7)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series A-1 Preferred Stock	(1)	07/28/2020		C			3,095,238	(1)	(1)	Common Stock	351,331(1)	(1)	0	I	See footnote(2)
Series B Preferred Stock	(1)	07/28/2020		C			4,016,573	(1)	(1)	Common Stock	455,909(1)	(1)	0	I	See footnote(3)
Series C Preferred Stock	(1)	07/28/2020		C			5,537,036	(1)	(1)	Common Stock	628,494(1)	(1)	0	I	See footnote(4)
Series D Preferred Stock	(1)	07/28/2020		C			2,812,543	(1)	(1)	Common Stock	319,244(1)	(1)	0	I	See footnote(4)

Explanation of Responses:

1. The shares of Series A-1, Series B, Series C and Series D Preferred Stock were automatically converted on a 1-for-8.81 basis into Common Stock immediately prior to the closing of the Issuer's initial public offering.

2. The amount in Column 5 includes (a) 952,381 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 and (b) 2,142,857 shares that are held by various other trusts and other entities for which the Reporting Person serves as trustee, investment advisor or manager and, in such capacity, has sole voting and dispositive power over all such shares. The Reporting Person disclaims beneficial ownership of all shares included in clause (b) of this footnote (2), except to the extent of his pecuniary interest.

3. The amount in Column 5 includes (a) 1,162,022 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 and (b) 2,854,551 shares that are held by various other trusts and other entities for which the Reporting Person serves as trustee, investment advisor or manager and, in such capacity, has sole voting and dispositive power over all such shares. The Reporting Person disclaims beneficial ownership of all shares included in clause (b) of this footnote (3), except to the extent of his pecuniary interest.

4. Represents shares held by Satter Medical Technology Partners, L.P. ("SMTP"), 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 in this footnote (4), except to the extent of his pecuniary interest.

5. The amount in Column 5 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 other entities for which the Reporting Person serves as trustee, investment advisor or manager and, in such capacity, has sole voting and dispositive power over all such shares, and (c) 947,738 shares that are held by SMTP 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 in clauses (b) and (c) of this footnote (5), except to the extent of his pecuniary interest.

6. Represents shares purchased by SMTP in connection with the Issuer's initial public offering. These shares of Common Stock were purchased at the public offering price of $17.00 per share.

7. The amount in Column 5 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 other entities for which the Reporting Person serves as trustee, investment advisor or manager and, in such capacity, has sole voting and dispositive power over all such shares, and (c) 1,147,738 shares that are held by SMTP 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 in clauses (b) and (c) of this footnote (7), except to the extent of his pecuniary interest.

	/s/ Robert M. Hayward, as Attorney-in-Fact for Muneer A. Satter	07/28/2020
	** Signature of Reporting Person	Date
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