C4 Therapeutics director acquires 3,662 shares

C4 Therapeutics, Inc. director Kenneth Carl Anderson acquired 3,662 common shares on October 1, 2026, issued under the company’s Non-Employee Director Compensation Policy after he elected shares in lieu of cash compensation for director services.

Rhea-AI Filing Summary

C4 Therapeutics, Inc. director Kenneth Carl Anderson acquired 3,662 common shares on October 1, 2026, issued under the company’s Non-Employee Director Compensation Policy after he elected shares in lieu of cash compensation for director services. The reported $3.14 per-share figure is based on the issuer’s closing market price that day. His direct common-stock holdings were 75,612 shares following the transaction.

Five additional common-stock positions were reported through trusts. Anderson disclaimed beneficial ownership of those shares except to the extent of his pecuniary interest.

Insider Trade Summary

Grant/Award: 3,662 shares

Grant/Award 6 txns

Insider Anderson Kenneth Carl

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1, F2	3,662	$3.14	$11K
holding	Common Stock F3	--	--	--
holding	Common Stock F4	--	--	--
holding	Common Stock F5	--	--	--
holding	Common Stock F6	--	--	--
holding	Common Stock F7	--	--	--

Holdings After Transaction: Common Stock — 75,612 shares (Direct); Common Stock — 129,877 shares (Indirect, By Kenneth C. Anderson 2021 Irrevocable Trust); Common Stock — 74,581 shares (Indirect, By Kenneth C. Anderson 2015 Irrevocable Trust); Common Stock — 74,581 shares (Indirect, By Cynthia E. Anderson 2015 Irrevocable Trust); Common Stock — 3,623 shares (Indirect, By Kenneth C. Anderson Revocable Trust); Common Stock — 3,623 shares (Indirect, By Cynthia E. Anderson Revocable Trust)

Footnotes (7)

1. F1. These shares were issued in accordance with the Issuer's Non-Employee Director Compensation Policy, pursuant to which the Reporting Person elected to receive shares of the Issuer's common stock in lieu of cash compensation for services as a non-employee director of the Issuer.
2. F2. The price reported in Column 4 is based upon the closing market price of the Issuer's common stock on October 1, 2026.
3. F3. Shares held by the Kenneth C. Anderson 2021 Irrevocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
4. F4. Shares held by the Kenneth C. Anderson 2015 Irrevocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
5. F5. Shares held by the Cynthia E. Anderson 2015 Irrevocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
6. F6. Shares held by the Kenneth C. Anderson Revocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
7. F7. Shares held by the Cynthia E. Anderson Revocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

Key Figures

Common shares issued in lieu of cash compensation: 3,662 shares Reported closing market price per share: $3.14 per share Direct common shares following transaction: 75,612 shares +5 more

8 metrics

Common shares issued in lieu of cash compensation 3,662 shares October 1, 2026

Reported closing market price per share $3.14 per share October 1, 2026

Direct common shares following transaction 75,612 shares October 1, 2026

Kenneth C. Anderson 2021 Irrevocable Trust shares 129,877 shares Reported October 1, 2026

Kenneth C. Anderson 2015 Irrevocable Trust shares 74,581 shares Reported October 1, 2026

Cynthia E. Anderson 2015 Irrevocable Trust shares 74,581 shares Reported October 1, 2026

Kenneth C. Anderson Revocable Trust shares 3,623 shares Reported October 1, 2026

Cynthia E. Anderson Revocable Trust shares 3,623 shares Reported October 1, 2026

Key Terms

Non-Employee Director Compensation Policy, pecuniary interest, beneficial ownership

3 terms

Non-Employee Director Compensation Policy financial

"Issuer's Non-Employee Director Compensation Policy"

pecuniary interest financial

"except to the extent of his pecuniary interest therein"

beneficial ownership financial

"disclaims beneficial ownership of these shares"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many shares did CCCC director Kenneth Carl Anderson receive?

C4 Therapeutics issued 3,662 common shares to director Kenneth Carl Anderson on October 1, 2026, after he elected shares instead of cash compensation. The reported $3.14 per share was based on the closing market price that day.

What CCCC shares did Kenneth Carl Anderson report in trusts?

He reported 129,877 shares in the Kenneth C. Anderson 2021 Irrevocable Trust; 74,581 shares in each of the Kenneth C. Anderson and Cynthia E. Anderson 2015 Irrevocable Trusts; and 3,623 shares in each of their revocable trusts. He disclaimed beneficial ownership except to the extent of his pecuniary interest in those shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/02/2026 - 04:44 PM Accepted by SEC EDGAR 10/02/2026 - 04:43 PM Learn about SEC filing dates

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).

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^*

Anderson Kenneth Carl

(Last) (First) (Middle)

C/O C4 THERAPEUTICS, INC.

490 ARSENAL WAY #120

(Street)

WATERTOWN MASSACHUSETTS 02472

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
C4 Therapeutics, Inc. [ CCCC ]

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)
10/01/2026

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	10/01/2026		A(1)		3,662	A	$3.14(2)	75,612	D
Common Stock								129,877	I	By Kenneth C. Anderson 2021 Irrevocable Trust(3)
Common Stock								74,581	I	By Kenneth C. Anderson 2015 Irrevocable Trust(4)
Common Stock								74,581	I	By Cynthia E. Anderson 2015 Irrevocable Trust(5)
Common Stock								3,623	I	By Kenneth C. Anderson Revocable Trust(6)
Common Stock								3,623	I	By Cynthia E. Anderson Revocable Trust(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

Explanation of Responses:

1. These shares were issued in accordance with the Issuer's Non-Employee Director Compensation Policy, pursuant to which the Reporting Person elected to receive shares of the Issuer's common stock in lieu of cash compensation for services as a non-employee director of the Issuer.

2. The price reported in Column 4 is based upon the closing market price of the Issuer's common stock on October 1, 2026.

3. Shares held by the Kenneth C. Anderson 2021 Irrevocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

4. Shares held by the Kenneth C. Anderson 2015 Irrevocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

5. Shares held by the Cynthia E. Anderson 2015 Irrevocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

6. Shares held by the Kenneth C. Anderson Revocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

7. Shares held by the Cynthia E. Anderson Revocable Trust. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

Remarks:

	/s/ Shagha Russell, Attorney-in-Fact	10/02/2026
	** 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)