STOCK TITAN

Director Anderson (NASDAQ: CCCC) exercises 1,070 options at $2.11

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

C4 Therapeutics director Kenneth Carl Anderson exercised stock options to acquire 1,070 shares of common stock on June 1, 2026. The options were exercised at a price of $2.11 per share for cash, and no shares were sold in connection with the exercise.

Following the exercise, Anderson directly holds 69,300 shares of C4 Therapeutics common stock. Additional shares are held indirectly through several revocable and irrevocable trusts associated with Anderson and Cynthia E. Anderson, for which he disclaims beneficial ownership except to the extent of any pecuniary interest.

Positive

  • None.

Negative

  • None.
Insider Anderson Kenneth Carl
Role null
Type Security Shares Price Value
Exercise Stock Option (Right to Buy) 1,070 $0.00 --
Exercise Common Stock 1,070 $2.11 $2K
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Stock Option (Right to Buy) — 0 shares (Direct, null); Common Stock — 69,300 shares (Direct, null); Common Stock — 129,877 shares (Indirect, By Kenneth C. Anderson 2021 Irrevocable Trust)
Footnotes (1)
  1. The reported transaction represents the exercise of a stock option for cash. No shares were sold in connection with the exercise. 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. 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. 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. 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. 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. The shares underlying this option are fully vested and exercisable.
Options exercised 1,070 shares Common stock acquired via option exercise on June 1, 2026
Exercise price $2.11 per share Strike price for exercised stock options
Direct holdings after transaction 69,300 shares Common stock directly owned by Kenneth Carl Anderson after exercise
Options exercised (derivative record) 1,070 shares Stock Option (Right to Buy) converted into common stock
Option expiration date July 12, 2026 Expiration date of the exercised stock option grant
Shares held by Kenneth C. Anderson 2021 Irrevocable Trust 129,877 shares Indirect ownership via 2021 irrevocable trust
Shares held by each 2015 Irrevocable Trust 74,581 shares Indirect holdings in each Kenneth and Cynthia E. Anderson 2015 Irrevocable Trust
stock option financial
"The reported transaction represents the exercise of a stock option for cash."
A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.
derivative security financial
"Exercise or conversion of derivative security"
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
revocable trust financial
"By Cynthia E. Anderson Revocable Trust"
A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.
irrevocable trust financial
"Shares held by the Kenneth C. Anderson 2021 Irrevocable Trust."
An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.
pecuniary interest financial
"disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein."
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SEC Form 4
FORM 4UNITED 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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/01/2026M(1)1,070A$2.1169,300D
Common Stock129,877IBy Kenneth C. Anderson 2021 Irrevocable Trust(2)
Common Stock74,581IBy Kenneth C. Anderson 2015 Irrevocable Trust(3)
Common Stock74,581IBy Cynthia E. Anderson 2015 Irrevocable Trust(4)
Common Stock3,623IBy Kenneth C. Anderson Revocable Trust(5)
Common Stock3,623IBy Cynthia E. Anderson Revocable Trust(6)
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (Right to Buy)$2.1106/01/2026M(1)1,070 (7)07/12/2026Common Stock1,070$00D
Explanation of Responses:
1. The reported transaction represents the exercise of a stock option for cash. No shares were sold in connection with the exercise.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. The shares underlying this option are fully vested and exercisable.
Remarks:
/s/ Shagha Russell, Attorney-in-Fact06/04/2026
** Signature of Reporting PersonDate
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 C4 Therapeutics (CCCC) report for Kenneth Carl Anderson?

C4 Therapeutics reported that director Kenneth Carl Anderson exercised stock options to acquire 1,070 shares of common stock. The exercise occurred on June 1, 2026 and involved converting a derivative position into directly held shares.

At what price did Kenneth Carl Anderson exercise C4 Therapeutics (CCCC) stock options?

Kenneth Carl Anderson exercised his C4 Therapeutics stock options at an exercise price of $2.11 per share. This price represents the predetermined strike price of the options, not a new open-market purchase price for the company’s stock.

Did Kenneth Carl Anderson sell any C4 Therapeutics (CCCC) shares in this Form 4 filing?

No shares were sold in this transaction. The footnotes state the reported activity reflects a cash exercise of stock options, with no accompanying share sales, meaning Anderson increased his direct share ownership in C4 Therapeutics.

How many C4 Therapeutics (CCCC) shares does Kenneth Carl Anderson hold directly after the transaction?

After exercising stock options, Kenneth Carl Anderson directly holds 69,300 shares of C4 Therapeutics common stock. This post-transaction balance reflects his direct ownership and excludes additional shares held through various trusts.

Were all stock options underlying this C4 Therapeutics (CCCC) grant fully vested?

Yes, the filing notes that the shares underlying the exercised option were fully vested and exercisable. This means the option had already met its vesting conditions, allowing Anderson to exercise and convert it into common stock.