# EDGAR Filing Document

**Accession Number:** 0001662579
**File Stem:** 0001628280-26-035542
**Filing Date:** 2026-5
**Character Count:** 5766
**Document Hash:** 76919be223cca5b7a94d78a9bb5bba83
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-26-035542.hdr.sgml**: 20260515

**ACCESSION NUMBER**: 0001628280-26-035542

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 11

**CONFORMED PERIOD OF REPORT**: 20260515

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**FILED AS OF DATE**: 20260515

**DATE AS OF CHANGE**: 20260515

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** C4 Therapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001662579
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 475617627
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39567
- **FILM NUMBER:** 26986814

**BUSINESS ADDRESS:**
- **STREET 1:** 490 ARSENAL WAY
- **STREET 2:** SUITE 120
- **CITY:** WATERTOWN
- **STATE:** MA
- **ZIP:** 02472
- **BUSINESS PHONE:** (617) 231-0700

**MAIL ADDRESS:**
- **STREET 1:** 490 ARSENAL WAY
- **STREET 2:** SUITE 120
- **CITY:** WATERTOWN
- **STATE:** MA
- **ZIP:** 02472

?xml version='1.0' encoding='ASCII'? cccc-20260515

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

_________________________________________________________________

**FORM 8-K**

_________________________________________________________________

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

**Date of Report (Date of earliest event reported): May 15, 2026 (May 12, 2026)**

_________________________________________________________________

**C4 THERAPEUTICS, INC.**

**(Exact name of Registrant as Specified in Its Charter)**

_________________________________________________________________

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| | | |
|:---|:---|:---|
| **Delaware** | **001-39567** | **47-5617627** |
| **(State or Other Jurisdiction**<br>**of Incorporation)** | **(Commission File Number)** | **(IRS Employer**<br>**Identification No.)** |
| **490 Arsenal Way, Suite 120**<br>**Watertown, MA** | | **02472** |
| **(Address of Principal Executive Offices)** | | **(Zip Code)** |

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**Registrant's Telephone Number, Including Area Code: (617) 231-0700**

**Not Applicable**

**(Former Name or Former Address, if Changed Since Last Report)**

_________________________________________________________________

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

□ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

□ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

□ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

□ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

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| | | |
|:---|:---|:---|
| **Title of each class** | **Trading**<br>**Symbol(s)** | **Name of each exchange on which registered** |
| Common Stock, $0.0001 par value per share | CCCC | The Nasdaq Global Select Market |

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company □

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. □

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**Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.**

*Departure of Principal Accounting Officer* 

On May 12, 2026, C4 Therapeutics, Inc. (the "Company") determined that Mark Mossler will no longer serve as the Company's Chief Accounting Officer, effective May 15, 2026. Mr. Mossler's departure from the Company is not due to any disagreement with the Company or the Company's Board of Directors on any matter relating to the Company's financial reporting, operations, policies or practices.

*Appointment of Principal Accounting Officer*

Kendra R. Adams, the Company's Chief Financial Officer, Head of Corporate Affairs and Treasurer, has been designated as the Company's principal accounting officer, effective May 15, 2026. Information regarding Ms. Adams' background and business experience, contracts between the Company and Ms. Adams and any related party transactions involving Ms. Adams is incorporated by reference herein from the Company's 2026 definitive proxy statement on Schedule 14A, which was filed with the U.S. Securities and Exchange Commission on April 29, 2026. Ms. Adams will not receive any additional compensation for assuming the additional role of principal accounting officer, and no changes have been made to any plans or arrangements in which Ms. Adams participates as a result of this appointment.

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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| | | |
|:---|:---|:---|
| | C4 Therapeutics, Inc. | C4 Therapeutics, Inc. |
| Date: May 15, 2026 | By: | /s/ Kendra R. Adams |
|  |  | **Kendra R. Adams** |
|  |  | **Chief Financial Officer and Treasurer** |

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