Sec Form 4 Filing - Hottier-Fayon Geraldine @ Seagate Technology plc - 2018-09-22

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 Hottier-Fayon Geraldine 2. Issuer Name and Ticker or Trading Symbol Seagate Technology plc [ STX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Interim Prin. Accounting Ofcr (Last) (First) (Middle) 10200 S. DE ANZA BOULEVARD 3. Date of Earliest Transaction (MM/DD/YY) 09/22/2018 (Street) CUPERTINO, CA95014 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 09/22/2018 A 1,206 ( 1 ) A $ 0 8,634.6691 D Ordinary Shares 09/22/2018 F 418 ( 2 ) D $ 49.28 8,216.6691 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

Re porting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Hottier-Fayon Geraldine 10200 S. DE ANZA BOULEVARD CUPERTINO, CA95014 Interim Prin. Accounting Ofcr Signatures /s/ Laurie Webb Attorney-in-Fact for Geraldine Hottier-Fayon 09/25/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On September 22, 2018, the Compensation Committee of the Board of Directors of the Issuer determined that the performance conditions were met with respect to 1,206 of the 1,340 Performance Share Units granted to Ms. Hottier-Fayon on September 9, 2015. Achievement of performance objectives resulted in the Reporting Person earning Ordinary Shares in the amount of 90% of the Performance Share Units granted. The 1,206 Ordinary Shares vested on September 22, 2018. ( 2 )These Ordinary Shares are withheld securities to cover tax liabilities incident to the vesting of the above-listed Performance Share Units.

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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