Sec Form 4 Filing - Sigal Charles Elliott @ Adaptimmune Therapeutics PLC - 2016-05-19

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Sigal Charles Elliott 2. Issuer Name and Ticker or Trading Symbol Adaptimmune Therapeutics PLC [ ADAP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 32 BREARLY ROAD 3. Date of Earliest Transaction (MM/DD/YY) 05/19/2016 (Street) PRINCETON, NJ08540 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Ordinary Shares with a nominal value of GBP0.001 per share ( 1 ) 05/19/2016 P 15,000 ( 2 ) A $ 1.56 ( 3 ) 314,100 ( 4 ) I Shares held by Sigal Family Investments, LLC Ordinary Shares with a nominal value of GBP0.001 per share 52,938 ( 5 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Sigal Charles Elliott 32 BREARLY ROAD PRINCETON, NJ08540 X Signatures /s/ Charles Elliott Sigal 05/19/2016 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Dr. Sigal is a manager of Sigal Family Investments, LLC. Dr. Sigal may be deemed to have voting and investment power over the shares held by Sigal Family Investments, LLC. Dr. Sigal disclaims beneficial ownership of such shares except to the extent of any pecuniary interest therein. ( 2 )The 15,000 Ordinary Shares are represented by 2,500 American Depositary Shares ("ADSs") which are held by Sigal Family Investments, LLC. Each ADS represents six Ordinary Shares of Adaptimmune Therapeutics plc. ( 3 )The price of $1.56 per Ordinary Share was derived from the purchase price paid on May 19, 2016, of $9.36 per ADS, divided by six. ( 4 )The 314,100 Ordinary Shares comprise (i) 254,100 Ordinary Shares, and (ii) 60,000 Ordinary Shares represented by 10,000 ADSs. ( 5 )The 52,938 Ordinary Shares are represented by 8,823 ADSs.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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