CCCC insider files notice to sell shares

An affiliate of CCCC filed a notice related to potential sales of its common stock.

Rhea-AI Filing Summary

An affiliate of CCCC filed a notice related to potential sales of its common stock. The filing lists up to 4,139 shares of common stock to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services, with a noted date of 08/14/2026 and NASDAQ as the trading market. It also identifies restricted stock originating from issuer grants dated 02/14/2026 and 02/14/2025. In addition, the document details prior sales by Mark Mossler over the last three months, including 15,000 shares for $61,072.50 on 08/13/2026, 19,519 shares for $76,680.39 on 08/12/2026, and 9,087 shares for $35,484.74 on 05/27/2026.

Key Figures

Shares covered for potential sale: 4,139 shares Potential sale date: 08/14/2026 Recent sale 1: 15,000 shares for $61,072.50 +2 more

5 metrics

Shares covered for potential sale 4,139 shares Common stock listed in securities-to-be-sold section with NASDAQ as market

Potential sale date 08/14/2026 Date associated with 4,139 common shares to be sold

Recent sale 1 15,000 shares for $61,072.50 Common stock sold on 08/13/2026 by Mark Mossler

Recent sale 2 19,519 shares for $76,680.39 Common stock sold on 08/12/2026 by Mark Mossler

Recent sale 3 9,087 shares for $35,484.74 Common stock sold on 05/27/2026 by Mark Mossler

Key Terms

Restricted Stock, Executive Financial Services, Securities To Be Sold

3 terms

Restricted Stock financial

"Common | 02/14/2026 | Restricted Stock | Issuer"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Executive Financial Services financial

"Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

Securities To Be Sold financial

"144: Securities To Be Sold Common | 02/14/2026 | Restricted Stock"

FAQ

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

What does the Form 144 filing for CCCC disclose?

The Form 144 for CCCC discloses a planned sale of up to 4,139 shares of common stock through Morgan Stanley Smith Barney LLC, along with several recent sales by insider Mark Mossler over the prior three months.

How many CCCC shares are covered for potential sale in this Form 144?

The filing covers up to 4,139 shares of CCCC common stock for potential sale. These shares are to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services, with NASDAQ listed as the trading market.

What recent CCCC stock sales by Mark Mossler are reported?

Reported recent sales include 15,000 shares for $61,072.50 on 08/13/2026, 19,519 shares for $76,680.39 on 08/12/2026, and 9,087 shares for $35,484.74 on 05/27/2026.

What type of CCCC securities are involved in this Form 144?

The Form 144 involves common stock, including shares associated with restricted stock originally issued by the company on 02/14/2026 and 02/14/2025, as shown in the securities-to-be-sold section.

Which broker is handling the potential CCCC share sale?

The potential sale of up to 4,139 CCCC shares is listed as being handled by Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004.

On which market are the CCCC shares listed for the planned sale?

The filing identifies NASDAQ as the trading market for the CCCC common shares covered by the Form 144. This designation applies to the 4,139 shares listed in the securities-to-be-sold section.

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

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Available on EDGAR 08/14/2026 - 07:14 PM Accepted by SEC EDGAR 08/14/2026 - 07:14 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	0001992219
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	Mark Mossler
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	4139	17604.82	123025136	08/14/2026	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	02/14/2026	Restricted Stock	Issuer			1152	02/14/2026	Not Applicable
Common	02/14/2025	Restricted Stock	Issuer			2987	02/14/2025	Not Applicable

* 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
Mark Mossler 490 Arsenal Way, Suite 120 Watertown MA 02472	Common	08/13/2026	15000	61072.50
Mark Mossler 490 Arsenal Way, Suite 120 Watertown MA 02472	Common	08/12/2026	19519	76680.39
Mark Mossler 490 Arsenal Way, Suite 120 Watertown MA 02472	Common	05/27/2026	9087	35484.74

144: Remarks and Signature

Remarks
Date of Notice	08/14/2026
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/ Mark Mossler
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)