Annexon (NASDAQ: ANNX) director adds 8,000 shares in planned stock purchase

Rhea-AI Filing Summary

Annexon, Inc. director William H. Carson reported buying additional company stock. On April 10, 2026, he made an open-market purchase of 8,000 shares of common stock at $6.20 per share, bringing his direct holdings to 70,405 shares of Annexon common stock.

The filing notes that this transaction was executed under Carson’s Rule 10b5-1 trading plan, adopted on December 8, 2025, indicating the trade was pre-scheduled rather than a discretionary market-timing decision.

Insider Trade Summary 10b5-1

Net Buyer: 8,000 shares ($49,600)

Net Buy 1 txn

Insider Carson William H.

Role Director

Bought 8,000 shs ($50K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	8,000	$6.20	$50K

Holdings After Transaction: Common Stock — 70,405 shares (Direct)

Footnotes (1)

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Key Figures

Shares purchased: 8,000 shares Purchase price: $6.20 per share Shares held after trade: 70,405 shares +2 more

5 metrics

Shares purchased 8,000 shares Open-market purchase on April 10, 2026

Purchase price $6.20 per share Price for the 8,000 common shares bought

Shares held after trade 70,405 shares Direct Annexon common stock holdings post-transaction

Insider buy transactions 1 transaction BuyCount in transaction summary

Net buy shares 8,000 shares NetBuySellShares in transaction summary

Key Terms

open-market purchase, Rule 10b5-1 trading plan, Form 4

3 terms

open-market purchase financial

"transaction_action: "open-market purchase" for the 8,000-share trade"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Rule 10b5-1 trading plan regulatory

""transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan""

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Form 4 regulatory

"INSIDER FILING DATA (Form 4): disclosure of Carson’s transaction"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

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).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Carson William H.

(Last) (First) (Middle)

C/O ANNEXON, INC.

1400 SIERRA POINT PKWY, BLDG C, STE 200

(Street)

BRISBANE CALIFORNIA 94005

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/10/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	04/10/2026		P(1)		8,000	A	$6.2	70,405	D

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

Explanation of Responses:

1. The transactions reported herein were effected pursuant to the Reporting Person's Rule 10b5-1 trading plan, adopted December 8, 2025.

	/s/ Jennifer Lew, Attorney-in-Fact	04/14/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Annexon (ANNX) director William H. Carson report?

Annexon director William H. Carson reported an open-market purchase of 8,000 shares of common stock. The trade occurred on April 10, 2026 at $6.20 per share, increasing his direct holdings to 70,405 Annexon shares.

At what price did William H. Carson buy Annexon (ANNX) shares?

He bought Annexon common stock at $6.20 per share in an open-market transaction. This price applied to all 8,000 shares purchased on April 10, 2026, as disclosed in the Form 4 insider filing.

How many Annexon (ANNX) shares does William H. Carson hold after this trade?

After the reported transaction, William H. Carson directly holds 70,405 shares of Annexon common stock. This reflects his position following the April 10, 2026 open-market purchase of 8,000 additional shares at $6.20 each.

Was the Annexon (ANNX) insider purchase made under a Rule 10b5-1 trading plan?

Yes. The filing states the transactions were effected under Carson’s Rule 10b5-1 trading plan adopted on December 8, 2025. Such plans pre-schedule trades, indicating the timing of this April 10, 2026 purchase was arranged in advance.

What type of security did William H. Carson acquire in Annexon (ANNX)?

He acquired Annexon common stock, classified as a non-derivative security in the Form 4. The transaction involved buying 8,000 common shares at $6.20 each, increasing his directly held Annexon common stock to 70,405 shares.