Sec Form 4 Filing - MORTON DAVID H JR @ Seagate Technology plc - 2014-09-15

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 MORTON DAVID H JR 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) SVP, FINANCE, TREASURER & PAO (Last) (First) (Middle) SEAGATE TECHNOLOGY PLC, 10200 S. DE ANZA BOULEVARD 3. Date of Earliest Transaction (MM/DD/YY) 09/15/2014 (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 09/15/2014 S( 1 ) 2,536 D $ 59.4195 ( 2 ) 22,732 D Ordinary Shares 09/15/2014 M 1,146 A $ 11.065 23,878 D Ordinary Shares 09/15/2014 M 1,219 A $ 11.155 25,097 D Ordinary Shares 09/15/2014 M 438 A $ 29.87 25,535 D Ordinary Shares 09/15/2014 M 2,025 A $ 40.16 27,560 D Ordinary Shares 09/15/2014 S( 3 ) 2,531 D $ 60.5898 ( 4 ) 25,029 D Ordinary Shares 09/15/2014 S( 3 ) 2,297 D $ 61.1688 ( 5 ) 22,732 D Ordinary Shares 09/15/2014 S( 3 ) 2,542 D $ 60 20,190 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 NQ Stock Options $ 11.065 09/15/2014 M 1,146 09/13/2011( 6 ) 09/13/2017 Ordinary Shares 1,146 $ 0 0 D NQ Stock Options $ 11.155 09/15/2014 M 1,219 09/12/2012( 7 ) 09/12/2018 Ordinary Shares 1,219 $ 0 9,141 D NQ Stock Options $ 29.87 09/15/2014 M 438 09/10/2013( 8 ) 09/10/2019 Ordinary Shares 438 $ 0 5,906 D NQ Stock Options $ 40.16 09/15/2014 M 2,025 09/09/2014( 9 ) 09/09/2020 Ordinary Shares 2,025 $ 0 6,075 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other MORTON DAVID H JR SEAGATE TECHNOLOGY PLC 10200 S. DE ANZA BOULEVARD CUPERTINO, CA95014 SVP, FINANCE, TREASURER & PAO Signatures /s/ Jolene Mendelsohn by Power of Attorney 09/17/2014 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These Ordinary Shares were sold pursuant to a 10b5-1 trading plan to cover the tax liabilities relating to the vesting of Restricted Stock Units under award agreements dated September 13, 2010 and September 12, 2011. Vesting of 2,750 Restricted Stock Units on September 13, 2014 was previously reported in Table I of the Reporting Person's Form 4 on September 15, 2010. Vesting of 2,925 Restricted Stock Units on September 12, 2014 was previously reported in Table I of the Reporting Person's Form 4 on September 14, 2011. ( 2 )These Ordinary Shares were sold in multiple transactions at sales prices ranging from $59.4195 to $59.42 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnote of this Form 4. ( 3 )Shares sold pursuant to a 10b5-1 Trading Plan. ( 4 )These Ordinary Shares were sold in multiple transactions at sales prices ranging from $60.07 to $60.89, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnote of this Form 4. ( 5 )These Ordinary Shares were sold in multiple transactions at sales prices ranging from $61.12 to $61.23, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in the footnote of this Form 4. ( 6 )Options granted to the Reporting Person under the Issuer's 2001 Share Option Plan are subject to a four-year vesting schedule. One quarter of the option shares vested on September 13, 2011. The remaining options vested in equal monthly installments over the 36 months following September 13, 2011. ( 7 )Options granted to the Reporting Person under the Issuer's 2004 Stock Compensation Plan are subject to a four-year vesting schedule. One quarter of the option shares vested on September 12, 2012. The remaining options vest in equal monthly installments over the 36 months following September 12, 2012. ( 8 )Options granted to the Reporting Person under the Issuer's 2012 Incentive Equity Option Plan are subject to a four-year vesting schedule. One quarter of the option shares vested on September 10, 2013. The remaining options vest in equal monthly installments over the 36 months following September 10, 2013. ( 9 ) Options granted to the Reporting Person under the Issuer's 2012 Incentive Equity Option Plan are subject to a four-year vesting schedule. One quarter of the option shares vested on September 9, 2014. The remaining options vest in equal monthly installments over the 36 months following September 9, 2014.

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