CCCC Form 4: CFO RSU Settlement Increases Beneficial Ownership to 165,117

Rhea-AI Filing Summary

C4 Therapeutics insider filing: The reporting person, Kendra Adams (CFO), acquired 6,250 shares of common stock on 09/18/2025 upon vesting of previously granted restricted stock units (RSUs). The shares were issued at no cash price upon vesting and increased her beneficial holdings to 165,117 shares. In connection with the vesting, the issuer withheld 2,775 shares to satisfy tax withholding obligations, which reduced the net shares delivered and left 162,342 shares listed after the withholding entry on the Form 4.

Positive

• RSU vesting increased the reporting person's beneficial ownership to 165,117 shares
• Transaction was non-cash (vested RSUs settled), indicating compensation alignment rather than a market sale

Negative

• 2,775 shares withheld for taxes, reducing net delivery of vested shares (administrative impact on holdings)

Insights

Financial Analyst

TL;DR: Routine insider RSU vesting increases officer holdings; withholding for taxes is standard and not market-moving.

The Form 4 discloses a non-cash, routine settlement of previously granted RSUs for the CFO, resulting in an increase to beneficial ownership to 165,117 shares. The withholding of 2,775 shares to cover taxes is a common administrative action and does not indicate an open-market sale. There are no cash proceeds or dispositions reported beyond the withholding, and the transactions appear consistent with standard executive compensation settlement practices.

Corporate Governance Expert

TL;DR: Disclosure aligns with Section 16 reporting requirements; signatures and explanations are properly provided.

The filing includes the required explanation that the acquisition resulted from RSU vesting originally reported in 2023 and clearly states the tax-withholding share retention. The Form 4 is signed by an attorney-in-fact, which is acceptable when properly authorized. No departures from typical governance disclosure practices are evident in the document.

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

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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^*

Adams Kendra

(Last) (First) (Middle)

C/O C4 THERAPEUTICS, INC.

490 ARSENAL WAY #120

(Street)

WATERTOWN MA 02472

(City) (State) (Zip)

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

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/18/2025

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	09/18/2025		M(1)	V	6,250	A	$0	165,117	D
Common Stock	09/18/2025		F(2)		2,775	D	$3.32	162,342	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. Reflects the acquisition of shares of Common Stock upon vesting of a previously disclosed grant of restricted stock units ("RSUs"). The grant of RSUs was initially reported in Table I of the Form 4 filed by the Reporting Person on September 19, 2023.

2. Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of RSUs and does not represent a sale by the Reporting Person.

Remarks:

	/s/ Shagha Russell, Attorney-in-Fact	09/19/2025
	** 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.

FAQ

What did the Form 4 for CCCC filed by Kendra Adams report?

The filing reports the vesting settlement of RSUs on 09/18/2025 where 6,250 shares were acquired and 2,775 shares were withheld for taxes.

How many shares does the reporting person beneficially own after the transactions?

The Form 4 shows beneficial ownership of 165,117 shares following the reported acquisition.

Was there a sale of shares by the reporting person in this Form 4?

No. The filing discloses RSU vesting and tax withholding; it explicitly states the withheld shares do not represent a sale by the reporting person.

What caused the acquisition of shares reported on the Form 4 for CCCC?

The acquisition resulted from the vesting and settlement of previously granted restricted stock units (RSUs) originally reported on a Form 4 filed on September 19, 2023.

Who signed the Form 4 on behalf of the reporting person?

The Form 4 is signed by /s/ Shagha Russell, Attorney-in-Fact on 09/19/2025.