# EDGAR Filing Document

**Accession Number:** 0001789972
**File Stem:** 0001193125-25-291448
**Filing Date:** 2025-11
**Character Count:** 5033
**Document Hash:** 9765a35b6ca4bbed714c92f74a7c02e8
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-291448.hdr.sgml**: 20251121

**ACCESSION NUMBER**: 0001193125-25-291448

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 10

**CONFORMED PERIOD OF REPORT**: 20251118

**ITEM INFORMATION**: Termination of a Material Definitive Agreement

**FILED AS OF DATE**: 20251121

**DATE AS OF CHANGE**: 20251121

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Cullinan Therapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001789972
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 813879991
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39856
- **FILM NUMBER:** 251508428

**BUSINESS ADDRESS:**
- **STREET 1:** ONE MAIN STREET
- **STREET 2:** SUITE 1350
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02142
- **BUSINESS PHONE:** 617-410-4650

**MAIL ADDRESS:**
- **STREET 1:** ONE MAIN STREET
- **STREET 2:** SUITE 1350
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02142

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Cullinan Oncology, Inc.
- **DATE OF NAME CHANGE:** 20210225

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Cullinan Management, Inc.
- **DATE OF NAME CHANGE:** 20210107

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Cullinan Oncology, LLC
- **DATE OF NAME CHANGE:** 20191001

?xml version='1.0' encoding='ASCII'? 8-K

**UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549**

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## FORM 8-K

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**CURRENT REPORT**

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

**Date of Report (Date of earliest event reported):** November 18, 2025<br>

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CULLINAN THERAPEUTICS, INC.

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

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| | | |
|:---|:---|:---|
| Delaware | 001-39856 | 81-3879991 |
| **(State or Other Jurisdiction<br>of Incorporation)** | **(Commission File Number)** | **(IRS Employer<br>Identification No.)** |
| One Main Street<br>Suite 1350 |  |  |
| Cambridge**,** Massachusetts |  | 02142 |
| **(Address of Principal Executive Offices)** |  | **(Zip Code)** |

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**Registrant's Telephone Number, Including Area Code:** 617 410-4650<br>

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

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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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| | |
|:---|:---|
| **<br>Title of each class** | **<br>Name of each exchange on which registered** |
| Common Stock, $0.0001 par value per share<br> CGEM | 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 1.02 Termination of a Material Definitive Agreement.
On November 18, 2025, in connection with its decision not to pursue further development of CLN-617, Cullinan Amber Corp. (the "Company"), a subsidiary of Cullinan Therapeutics, Inc. notified Massachusetts Institute of Technology ("MIT") of its decision to terminate the Exclusive Patent License Agreement, dated December 20, 2019 between the Company and MIT, as amended from time to time (the "License Agreement"), effective as of February 18, 2026. Pursuant to the License Agreement, MIT had granted the Company exclusive worldwide rights to the technology underlying CLN-617 to develop a cancer immunotherapy product worldwide. In connection with the termination of the License Agreement, the Company will return the licensed patent rights for the technology underlying CLN-617 to MIT.

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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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| | | | |
|:---|:---|:---|:---|
|  |  |  | **CULLINAN THERAPEUTICS, INC.** |
| Date: | November 21, 2025 | By:  | /s/ Mary Kay Fenton |
|  |  |  | Mary Kay Fenton<br>Chief Financial Officer |

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