13D Filings
Cargo Therapeutics, Inc.
Amendment
Ownership

100.00%

Total Shares

10,000

Issuer CIK

1966494

CUSIP

14179K101

Event Date

Aug 18, 2025

Accepted

Aug 21, 2025, 04:15 PM

Reporting Persons (8)
Joint Filing

This is a joint filing. The reported shares may overlap between reporting persons and should not be summed.

NameType% of ClassAggregateSole VotingShared Voting
TANG CAPITAL PARTNERS, LP
Partnership
100.00%10,000010,000
KEVIN TANG
Individual
100.00%10,000010,000
CONCENTRA BIOSCIENCES, LLC
Other
100.00%10,000010,000
TANG CAPITAL MANAGEMENT, LLC
Other
100.00%10,000010,000
CONCENTRA MERGER SUB VII, INC.
CO
0.00%000
TANG CAPITAL PARTNERS INTERNATIONAL, LP
Partnership
0.00%000
TANG CAPITAL PARTNERS III, INC
CO
0.00%000
TANG CAPITAL PARTNERS IV, INC
CO
0.00%000
Disclosure Items (4)

Security Title

Common Stock, par value $0.001 per share

Issuer Name

Cargo Therapeutics, Inc.

Issuer Address

835 Industrial Road, Suite 400, San Carlos, CA, 94070

Item 4 of the Schedule 13D is amended by adding the following: Closing of the Merger: As previously disclosed, each of Concentra, the Issuer and Merger Sub entered into the Merger Agreement, which provides for an Offer by Merger Sub for all of the Issuer's Common Stock. The Offer commenced on July 21, 2025. On August 19, 2025, the Offer expired and Merger Sub accepted for purchase a total of 34,569,840 shares tendered and not withdrawn, representing approximately 71.48% of the total shares of the Issuer issued and outstanding. Following the expiration of the Offer, Merger Sub merged with and into the Issuer on August 19, 2025, pursuant to Section 251(h) of the Delaware General Corporation Law, and, among other things, each share of common stock of Merger Sub issued and outstanding immediately before the Effective Time automatically converted into the right to receive the Offer Price, with the Issuer surviving as a wholly owned subsidiary of Concentra.

Percentage of Class

The information previously provided in response to Item 5 is hereby amended and restated by replacing the text thereof in its entirety with the following: The information set forth in the cover pages of this Schedule 13D is hereby incorporated by reference into this Item 5. As of the date hereof the Reporting Persons beneficially own an aggregate of 10,000 shares of the Issuer's Common Stock, representing 100% of the outstanding shares.

Number of Shares

See item 5(a) above.

Transactions

Except as described in this Amendment No. 2, there have been no transactions in the Issuer's Common Stock during the past 60 days by the Reporting Persons.

Shareholders

No person other than a Reporting Person has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, Common Stock beneficially owned by the Reporting Persons.

Date of 5% Ownership

Not applicable.

Exhibit 1: Joint Filing Agreement by and among the Reporting Persons (filed as Exhibit 1 of the 13D filed on February 21, 2025 by the Reporting Persons with respect to the Common Stock of the Issuer). Exhibit 2: Schedule A: Transactions during the past 60 days (filed as Exhibit 2 of the 13D filed on February 21, 2025 by the Reporting Persons with respect to the Common Stock of the Issuer). Exhibit 3: Agreement and Plan of Merger, dated July 7, 2025, by and among Concentra Biosciences, LLC, Concentra Merger Sub VII, Inc. and Cargo Therapeutics, Inc. (filed as Exhibit 2.1 of the Issuer's Current Report filed on Form 8-K on July 8, 2025). Exhibit 4: Schedule TO (filed by Concentra on July 21, 2025). Exhibit 5: Offer to Purchase, dated July 21, 2025 (filed as Exhibit (a)(1)(A) to the Schedule TO filed by Concentra on July 21, 2025). Exhibit 6: Form of Letter of Transmittal (filed as Exhibit (a)(1)(B) to the Schedule TO filed by Concentra on July 21, 2025). Exhibit 7: Form of Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees (filed as Exhibit (a)(1)(C) to the Schedule TO filed by Concentra on July 21, 2025). Exhibit 8: Form of Letter to Clients for Use by Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees (filed as Exhibit (a)(1)(D) to the Schedule TO filed by Concentra on July 21, 2025). Exhibit 9: Confidentiality Agreement, dated March 28, 2025, between Cargo and TCM (filed as Exhibit (d)(2) to the Schedule TO filed by Concentra on July 21, 2025). Exhibit 10: Limited Guaranty, dated July 7, 2025 (filed as Exhibit (d)(3) to the Schedule TO filed by Concentra on July 21, 2025). Exhibit 11: Joint Filing Agreement, dated August 21, 2025, by and among the Reporting Persons.

Cargo Therapeutics, Inc. — Schedule 13D | 13D Filings