CCCC files Form 144 to sell 101,175 shares

CCCC submitted a Form 144 notice for the proposed sale of 101,175 shares of common stock via a stock option exercise to be effected on 03/09/2026.

Rhea-AI Filing Summary

CCCC submitted a Form 144 notice for the proposed sale of 101,175 shares of common stock via a stock option exercise to be effected on 03/09/2026. The filing also records a prior sale of 11,517 shares on 02/17/2026 with proceeds shown as $21,193.82.

Insights

Securities Compliance Analyst

Form 144 lists a planned sale of 101,175 shares tied to option exercise on 03/09/2026.

The notice identifies the method as a stock option exercise with cash proceeds and a filing date of 03/09/2026. Form 144 is a notice of proposed sale under Rule 144; it does not itself execute transactions.

Prior activity shows a sale of 11,517 shares on 02/17/2026 for $21,193.82. Subsequent SEC filings or broker reports will confirm execution and settlement details.

Corporate Governance Specialist

This filing documents a holder’s planned disposition; it is routine and administrative in nature.

The notice names the broker-dealer Morgan Stanley Smith Barney LLC and lists 101,175 shares to be sold. Rule-based disclosures like this inform market overhang but do not change corporate fundamentals by themselves.

Watch for follow-up filings reporting actual sale quantities and any changes in beneficial ownership; timing shown is 03/09/2026.

FAQ

What does CCCC's Form 144 filed 03/09/2026 report?

It reports a proposed sale of 101,175 common shares via a stock option exercise scheduled for 03/09/2026. The filing is a regulatory notice of intent to sell under Rule 144, not a record of a completed trade.

Who is the broker handling the proposed sale in the CCCC Form 144?

The filing lists Morgan Stanley Smith Barney LLC as the broker-dealer associated with the transaction. The notice attributes the planned sale method as a stock option exercise to be settled for cash on 03/09/2026.

Does the Form 144 show any recent sales by insiders of CCCC?

Yes; the filing records a prior sale of 11,517 shares on 02/17/2026 with proceeds shown as $21,193.82. That entry reflects past disposition activity reported alongside the proposed sale.

Does filing Form 144 mean the shares have already been sold?

No. Form 144 is a notice of intent to sell under Rule 144; it does not confirm execution. Actual sales and settlement are reported separately if and when they occur in subsequent filings or broker reports.

What should investors look for after this Form 144 from CCCC?

Investors should look for follow-up disclosures that report execution or changes: subsequent Form 4 or broker confirmations will show actual sale quantities and any resulting changes in beneficial ownership after 03/09/2026.

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

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Accepted by SEC EDGAR 03/09/2026 - 04:20 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001768223
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	C4 THERAPEUTICS, INC.
SEC File Number	001-39567
Address of Issuer	490 Arsenal Way, Suite 120 Watertown MASSACHUSETTS 02472
Phone	(617) 231-0700
Name of Person for Whose Account the Securities are To Be Sold	JOLIE M SIEGEL
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	101175	378849.35	97578175	03/09/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/09/2026	Stock Option Exercise	Issuer			101175	03/09/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
JOLIE M SIEGEL 490 Arsenal Way, Suite 120 Watertown MA 02472	Common	02/17/2026	11517	21193.82

144: Remarks and Signature

Remarks
Date of Notice	03/09/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Jolie Siegel
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)