Exhibit 99.1

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Adaptimmune Reports First Quarter Financial Results and Business Update

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Completed submission of the clinical module (Part 2) of the afami-cel BLA;
afami-cel is targeted to be the first marketed engineered T-cell therapy for a solid tumor

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Adaptimmune and GSK agreed terms for transfer of PRAME and NY-ESO target programs; Adaptimmune will receive ~$37 million in upfront and milestone payments

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Announced strategic combination with TCR² to create a preeminent cell therapy company for solid tumors; following closing of the transaction in Q2 2023, cash runway extended into early 2026

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Webcast to be held today, May 12, 2023, at 8:00 a.m. EDT (1:00 p.m. BST)

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PHILADELPHIA, PA. and OXFORD, UK, May 12, 2023 – Adaptimmune Therapeutics plc (Nasdaq: ADAP), a leader in cell therapy to treat cancer, today reported financial results for the first quarter ended March 31, 2023 and provided a business update.

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Adrian Rawcliffe, Adaptimmune’s Chief Executive Officer: “We have entered 2023 at pace with the announcement of the strategic combination with TCR², the finalization of the return of lete-cel from GSK and continued excellent progress on the rolling BLA submission to make afami-cel a transformative therapy for people with synovial sarcoma. In addition, we are deploying ADP-A2M4CD8 in ovarian cancer with the SURPASS-3 clinical trial. Following the strategic combination with TCR², the combined company will have the most robust and advanced pipeline in the solid tumor cell therapy field and will position us as a preeminent integrated cell therapy company with a cash runway into early 2026.”

Afami-cel - Adaptimmune’s first potential commercial product for the treatment of synovial sarcoma

BLA update

In Q1 2023, Adaptimmune completed submission of the clinical module (Part 2) of the afami-cel BLA, which is targeted for completion in mid-2023. This BLA is supported by data from Cohort 1 of the pivotal trial SPEARHEAD-1, which met its primary endpoint for efficacy. The Company has Regenerative Medicine Advanced Therapy (RMAT) designation from the FDA for afami-cel for the treatment of synovial sarcoma. Cohort 2 of the SPEARHEAD-1 trial has completed recruitment.

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Data presentations

ASGCT: Translational analyses for afami-cel will be showcased on May 18^th at 4:00 p.m. PST during the Cell Therapy Product Engineering and Development oral session in Room 502AB at the upcoming American Society of Cell and Gene Therapy (ASGCT) Annual Meeting in a presentation entitled “Mechanistic Characterization of Afamitresgene Autoleucel.” These analyses seek to correlate in-vitro T-cell effector functions with patient response.

ASCO: Data from SPEARHEAD-1 will be presented on June 3^rd at 1:15 p.m. CDT during the Sarcoma Track Poster Session in Hall A at the upcoming American Society of Clinical Oncology (ASCO) Annual Meeting in a presentation entitled: “The SPEARHEAD-1 trial of afamitresgene autoleucel ("afami-cel"): Analysis of overall survival in advanced synovial sarcoma.”

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AACR: Translational data from patients with sarcoma who received afami-cel were presented at the American Association for Cancer Research (AACR) annual meeting in April. Data demonstrated engagement of the broader immune system after a single dose of afami-cel correlating with durable antitumor activity (poster can be accessed here). These data further support the use of afami-cel for the treatment of synovial sarcoma.

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ADP-A2M4CD8 – Adaptimmune’s next-generation product with responses in multiple solid tumor indications

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Additional pipeline updates

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Strategic combination with TCR²

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Financial Results for the first quarter ended March 31, 2023

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Financial Guidance

The Company believes that its existing cash, cash equivalents and marketable securities, together with the additional payments under the Strategic Collaboration and License Agreement with Genentech and payments under the Termination and Transfer Agreement with GSK, will fund the Company’s current operations into early 2025, as further detailed in the Company’s Quarterly Report on Form 10-Q for the first quarter ended March 31, 2023, to be filed with the Securities and Exchange Commission following this earnings release.

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On March 6, 2023 the Company announced entry into a merger agreement under which the Company will combine with TCR² Therapeutics Inc in an all-stock transaction. Following the closing of the transaction, we currently estimate that the cash runway of the combined company will extend into early 2026.

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Webcast Information

The Company will host a live webcast to provide additional details at 8:00 a.m. EDT (1:00 p.m. BST) today, May 12, 2023. A live webcast of the conference call and replay can be accessed at  https://www.gowebcasting.com/12528. Call in information is as follows: (800)-319-4610 (US or Canada) or +1 (416)-915-3239 (International and additional options available HERE). Callers should dial in 5-10 minutes prior to the scheduled start time and simply ask to join the Adaptimmune call.

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About Adaptimmune

¹ Total liquidity is a non-GAAP financial measure, which is explained and reconciled to the most directly comparable financial measures prepared in accordance with GAAP below

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Adaptimmune is a clinical-stage biopharmaceutical company focused on the development of novel cancer immunotherapy products for people with cancer. The Company’s unique SPEAR (Specific Peptide Enhanced Affinity Receptor) T-cell platform enables the engineering of T-cells to target and destroy cancer across multiple solid tumors. 

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Forward-Looking Statements

This communication relates to the proposed transaction pursuant to the terms of the Agreement and Plan of Merger, dated March 5, 2023, as amended on April 5, 2023, by and among Adaptimmune Therapeutics plc (“Parent”), CM Merger Sub, Inc. (“Merger Sub”), and TCR² Therapeutics Inc.  (the “Company”). This communication includes express or implied forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), about the proposed transaction between  Parent and the Company and the operations of the combined company that involve risks and uncertainties relating to future events and the future performance of Parent and the Company. Actual events or results may differ materially from these forward-looking statements. Words such as “will,” “could,” “would,” “should,” “expect,” “plan,” “anticipate,” “intend,” “believe,” “estimate,” “predict,” “project,” “potential,” “continue,” “future,” “opportunity” “will likely result,” “target,” variations of such words, and similar expressions or negatives of these words are intended to identify such forward-looking statements, although not all forward-looking statements contain these identifying words. Examples of such forward-looking statements include, but are not limited to, express or implied statements regarding: the business combination and related matters, including, but not limited to, satisfaction of closing conditions to the proposed transaction, prospective performance and opportunities with respect to Parent or the Company, post-closing operations and the outlook for the companies’ businesses; Parent’s, the Company’s or the combined company’s targets, plans, objectives or goals for future operations, including those related to Parent’s and the Company’s product candidates, research and development, product candidate introductions and product candidate approvals as well as cooperation in relation thereto; projections of or targets for revenues, costs, income (or loss), earnings per share, capital expenditures, dividends, capital structure, net financials and other financial measures; future economic performance, future actions and outcome of contingencies such as legal proceedings; and the assumptions underlying or relating to such statements.

These statements are based on Parent’s and the Company’s current plans, estimates and projections. By their very nature, forward-looking statements involve inherent risks and uncertainties, both general and specific. A number of important factors, including those described in this communication, could cause actual results to differ materially from those contemplated in any forward-looking statements. Factors that may affect future results and may cause these forward-looking statements to be inaccurate include, without limitation: uncertainties as to the timing for completion of the proposed transaction; uncertainties as to Parent’s and/or the Company’s ability to obtain the approval of Parent’s shareholders or the Company’s stockholders required to consummate the proposed transaction; the possibility that competing offers will be made by third parties; the occurrence of events that may give rise to a right of one or both of Parent and the Company to terminate the merger agreement; the possibility that various closing conditions for the proposed transaction may not be satisfied or waived on a timely basis or at all, including the possibility that a governmental entity may prohibit, delay, or refuse to grant approval, if required, for the consummation of the proposed transaction (or only grant approval subject to adverse conditions or limitations); the difficulty of predicting the timing or outcome of consents or regulatory approvals or actions, if any; the possibility that the proposed transaction may not be completed in the time frame expected by Parent and the Company, or at all; the risk that Parent and Company may not realize the anticipated benefits of the proposed transaction in the time frame expected, or at all; the

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effects of the proposed transaction on relationships with Parent’s or the Company’s employees, business or collaboration partners or governmental entities; the ability to retain and hire key personnel; potential adverse reactions or changes to business relationships resulting from the announcement or completion of the proposed transaction; significant or unexpected costs, charges or expenses resulting from the proposed transaction; the potential impact of unforeseen liabilities, future capital expenditures, revenues, costs, expenses, earnings, synergies, economic performance, indebtedness, financial condition and losses on the future prospects, business and management strategies for the management, expansion and growth of the combined business after the consummation of the proposed transaction; potential negative effects related to this announcement or the consummation of the proposed transaction on the market price of Parent’s American Depositary Shares or the Company’s common stock and/or Parent’s or the Company’s operating or financial results; uncertainties as to the long-term value of Parent’s American Depositary Shares (and the ordinary shares represented thereby), including the dilution caused by Parent’s issuance of additional American Depositary Shares (and the ordinary shares represented thereby) in connection with the proposed transaction; unknown liabilities related to Parent or the Company; the nature, cost and outcome of any litigation and other legal proceedings involving Parent, the Company or their respective directors, including any legal proceedings related to the proposed transaction; risks related to global as well as local political and economic conditions, including interest rate and currency exchange rate fluctuations; potential delays or failures related to research and/or development of Parent’s or the Company’s programs or product candidates; risks related to any loss of Parent’s or the Company’s patents or other intellectual property rights; any interruptions of the supply chain for raw materials or manufacturing for Parent or the Company’s product candidates, the nature, timing, cost and possible success and therapeutic applications of product candidates being developed by Parent, the Company and/or their respective collaborators or licensees; the extent to which the results from the research and development programs conducted by Parent, the Company, and/or their respective collaborators or licensees may be replicated in other studies and/or lead to advancement of product candidates to clinical trials, therapeutic applications, or regulatory approval; uncertainty of the utilization, market acceptance, and commercial success of Parent or the Company’s product candidates, and the impact of studies (whether conducted by Parent, the Company or others and whether mandated or voluntary) on any of the foregoing; unexpected breaches or terminations with respect to Parent’s or the Company’s material contracts or arrangements; risks related to competition for Parent’s or the Company’s product candidates; Parent’s or the Company’s ability to successfully  develop or commercialize Parent’s or the Company’s product candidates; Parent’s, the Company’s, and their collaborators’ abilities to continue to conduct current and future developmental, preclinical and clinical programs; potential exposure to legal proceedings and investigations; risks related to changes in governmental laws and related interpretation thereof, including on reimbursement, intellectual property protection and regulatory controls on testing, approval, manufacturing, development or commercialization of any of Parent’s or the Company’s product candidates; unexpected increase in costs and expenses with respect to the potential transaction or Parent’s or the Company’s business or operations; and risks and uncertainties related to epidemics, pandemics or other public health crises and their impact on Parent’s and the Company’s respective businesses, operations, supply chain, patient enrollment and retention, preclinical and clinical trials, strategy, goals and anticipated milestones. While the foregoing list of factors presented here is considered representative, no list should be considered to be a complete statement of all potential risks and uncertainties. There can be no assurance that the proposed transaction or any other transaction described above will in fact be consummated in the manner described or at all. A more complete description of these and other material risks can be found in Parent’s and the Company’s respective filings with the U.S. Securities and Exchange Commission (the “SEC”), including each of their Annual Reports on Form 10-K for the year ended December 31, 2022, subsequent Quarterly Reports on

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Form 10-Q and other documents that may be filed from time to time with the SEC, as well as, the Registration Statement on Form S-4 which includes the joint proxy statement of Parent and the Company that also constitutes the prospectus of Parent, which joint proxy statement/prospectus has been mailed or otherwise disseminated to Parent’s shareholders and the Company’s stockholders on or about April 24, 2023. Parent and the Company also plan to file other relevant documents with the SEC regarding the proposed transaction.

Any forward-looking statements speak only as of the date of this communication and are made based on the current beliefs and judgments of Parent’s and the Company’s management, and the reader is cautioned not to rely on any forward-looking statements made by Parent or the Company. Unless required by law, neither Parent nor the Company is under no duty and undertakes no obligation to update or revise any forward-looking statement after the distribution of this document, including without limitation any financial projection or guidance, whether as a result of new information, future events or otherwise.

No Offer or Solicitation

This communication is not intended to and shall not constitute an offer to subscribe for, buy or sell or the solicitation of an offer to subscribe for, buy or sell any securities, or a solicitation of any vote or approval, nor shall there be any sale of, or offer to sell or buy, securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. This communication is for informational purposes only. No offering of securities shall be made, except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933, as amended, and otherwise in accordance with applicable law.

Additional Information and Where to Find It

In connection with the proposed transaction, Parent and the Company filed with the SEC a Registration Statement on Form S-4. The Registration Statement on Form S-4 includes a document that serves as a prospectus of Parent and a joint proxy statement of Parent and the Company, and each party may also file other documents regarding the proposed transaction with the SEC.

Parent and the Company mailed or otherwise provided to its respective shareholders and stockholders the joint proxy statement/prospectus and other relevant documents in connection with the proposed transaction on or about April 24, 2023. Before making a voting decision, Parent shareholders and the Company stockholders are urged to read the joint proxy statement/prospectus and any other documents filed by each of Parent and the Company with the SEC in connection with the proposed transaction or incorporated by reference therein carefully and in their entirety because they will contain important information about Parent, the Company and the proposed transaction. You may obtain a copy of these materials (when they are available) and other documents filed by Parent and the Company with the SEC for free at the SEC’s website at www.sec.gov. Copies of the documents filed with the SEC by the Company are available free of charge on the Company’s website at https://investors.tcr2.com/ or by contacting the Company’s Investor Relations Department at https://investors.tcr2.com/contact-ir. Copies of the documents filed with the SEC by Parent are available free of charge on Parent’s website at https://www.adaptimmune.com/investors-and-media/sec-filings or by contacting Parent’s Investor Relations Department at IR@adaptimmune.com.

Participants in the Solicitation

Parent, the Company and certain of their respective directors and executive officers and other members of management and employees may be deemed to be participants in the solicitation of proxies in respect of the proposed transaction. Information about the directors and executive officers of Parent, including a description of their direct or indirect interests, by security holdings or otherwise, is set forth in Parent’s proxy statement for its 2023 Annual General Meeting, which was filed with the SEC on April 13, 2023, the Annual Report on Form 10-K for the year ended December 31, 2022 filed with the SEC on  March 6, 2023,

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subsequent Quarterly Reports on Form 10-Q and other documents that may be filed from time to time with the SEC. Information about the directors and executive officers of the Company, including a description of their direct or indirect interests, by security holdings or otherwise, is set forth in the Company’s proxy statement for its 2022 Annual Meeting of Stockholders, which was filed with the SEC on September 1, 2022, the Annual Report on Form 10-K for the year ended December 31, 2022 filed with the SEC on March 23, 2023, subsequent Quarterly Reports on Form 10-Q and other documents that may be filed from time to time with the SEC. Other information regarding the participants in the proxy solicitations and a description of their direct and indirect interests, by security holdings or otherwise, is contained in the joint proxy statement/prospectus included in the Registration Statement on Form S-4 and other relevant materials to be filed with the SEC regarding the proposed transaction when such materials become available. Security holders, potential investors and other readers should read the joint proxy statement/prospectus included in the Registration Statement on Form S-4 carefully before making any voting or investment decision. You may obtain free copies of these documents from Parent or the Company using the sources indicated above.

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Total Liquidity (a non-GAAP financial measure)

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Total Liquidity (a non-GAAP financial measure) is the total of cash and cash equivalents and marketable securities (available-for-sale debt securities). Each of these components appears separately in the condensed consolidated balance sheet. The U.S. GAAP financial measure most directly comparable to Total Liquidity is cash and cash equivalents as reported in the condensed consolidated financial statements, which reconciles to Total Liquidity as follows (in millions):

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The Company believes that the presentation of Total Liquidity provides useful information to investors because management reviews Total Liquidity as part of its assessment of overall solvency and liquidity, financial flexibility, capital position and leverage.

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Condensed Consolidated Statement of Operations

(unaudited, in thousands, except per share data)

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Condensed Consolidated Balance Sheets

(unaudited, in thousands, except share data)

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Condensed Consolidated Cash Flow Statement

(unaudited, in thousands)

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Adaptimmune Contact

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Investor Relations

Juli P. Miller, Ph.D. — VP, Corporate Affairs and Investor Relations

T: +1 215 825 9310

M: +1 215 460 8920

Juli.Miller@adaptimmune.com

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Media Relations

Dana Lynch, Senior Director of Corporate Communications

M: +1 267 990 1217

Dana.Lynch@adaptimmune.com