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): September 11, 2025

ADAPTIMMUNE THERAPEUTICS PLC

(Exact name of registrant as specified in its charter)


England and Wales	1-37368	Not Applicable
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

60 Jubilee Avenue, Milton Park

Abingdon, Oxfordshire OX14 4RX

United Kingdom

(Address of principal executive offices, including zip code)

(44) 1235 430000

(Registrant’s telephone number, including area code)

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:

Title of each class		Trading Symbol		Name of each exchange on which registered
American Depositary Shares, each representing 6 Ordinary Shares, par value £0.001 per share		ADAP		The Nasdaq Capital Market

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.☐

Item 3.01

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On September 11, 2025, Adaptimmune Therapeutics plc (the “Company”) received a written notice (the “Notice”) from the Listing Qualifications Staff (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that for the last 32 consecutive business days prior to the date of the Notice, the Company’s Market Value of Listed Securities (“MVLS”) was less than the $35.0 million minimum required for continued listing on The Nasdaq Capital Market, as required by Nasdaq Listing Rule 5550(b)(2) (the “MVLS Listing Rule”). Additionally, as of the date of the Notice, the Company did not meet either of the alternative Nasdaq continued listing standards under the Nasdaq Listing Rules: stockholders’ equity of at least $2.5 million or net income of $500,000 from continuing operations in the most recently completed fiscal year or in two of the three most recently completed fiscal years. In accordance with Nasdaq Listing Rule 5810(c)(3)(C), the Company has 180 calendar days, or until March 10, 2026, to regain compliance with the MVLS Listing Rule. In order to regain compliance with the MVLS Listing Rule, the Company’s MVLS must meet or exceed $35.0 million for a minimum of ten consecutive business days during the 180-day compliance period after which the Staff will provide to the Company written confirmation of compliance and the matter will be closed. In the event the Company does not regain compliance with the MVLS Listing Rule during the 180-day compliance period, the Staff will provide the Company notice that the Company’s securities will be subject to delisting, at which time, the Company may appeal the delisting determination to a Nasdaq hearings panel.

The Notice has no immediate effect on the listing or trading of the Company’s American Depositary Shares (“ADSs”) on The Nasdaq Capital Market. However, if the Company fails to timely regain compliance with the MVLS Listing Rule by March 10, 2026, the Company’s ADSs will be subject to delisting from Nasdaq at which time the Company may appeal the delisting determination to a Nasdaq hearings panel. The Company will continue to monitor its MVLS and consider its available options to regain compliance with the MVLS Listing Rule. There can be no assurance that the Company will regain compliance with the MVLS Listing Rule or otherwise maintain compliance with any of the other Nasdaq listing requirements.

Forward-Looking Statements

This Current Report on Form 8-K contains “forward-looking statements” within the meaning of the safe harbor provisions of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements are statements that are not historical facts and can be identified by words such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” or the negative of these terms, or other comparable terminology. These statements are based on our current expectations, estimates, and projections about our business and industry, management’s beliefs, and certain assumptions made by us, all of which are subject to change. Forward-looking statements in this Current Report on Form 8-K include, but are not limited to, the Company’s plans and ability to regain compliance with the MVLS Listing Rule and to maintain its listing on The Nasdaq Capital Market. Forward-looking statements involve known and unknown risks, uncertainties, and other factors that may cause our actual results, performance, or achievements to differ materially from those expressed or implied by the forward-looking statements. For a further description of the risks and uncertainties that could cause our actual results to differ materially from those expressed in these forward-looking statements, as well as risks relating to our business in general, we refer you to the risks described under the heading “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2024, our Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and other filings with the Securities and Exchange Commission. The forward-looking statements contained in this current report on Form 8-K speak only as of the date the statements were made and the Company does not undertake any obligation to update such forward-looking statements to reflect subsequent events or circumstances.

SIGNATURES

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


	ADAPTIMMUNE THERAPEUTICS PLC

Date:September 12, 2025	By:	/s/ Margaret Henry
		Name:	Margaret Henry
		Title:	Corporate Secretary

Adaptimmune Therapeutics PLC 8-K