Sec Form 4/A Filing - MORTON DAVID H JR @ Seagate Technology plc - 2013-09-13

FORM 4/A 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) VP, FINANCE, TREASURER & PAO (Last) (First) (Middle) SEAGATE TECHNOLOGY PLC, 10200 S. DE ANZA BOULEVARD 3. Date of Earliest Transaction (MM/DD/YY) 09/13/2013 (Street) CUPERTINO, CA95014 4. If Amendment, Date Original Filed (MM/DD/YY) 09/17/2013 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 09/13/2013( 1 ) M 1,667 A $ 3.345 30,881 D Ordinary Shares 09/13/2013( 1 ) M 573 A $ 11.065 31,454 D Ordinary Shares 09/13/2013( 1 ) M 610 A $ 11.155 32,064 D Ordinary Shares 09/13/2013( 1 ) M 2,625 A $ 29.87 34,689 D Ordinary Shares 09/13/2013( 1 ) S( 2 ) 5,475 D $ 40 29,214 D Ordinary Shares 09/13/2013 S( 3 ) 1,535 D $ 39.95 27,679 D Ordinary Shares 09/16/2013 S( 4 ) 1,407 D $ 41.103 ( 5 ) 26,272 D Ordinary Shares 09/17/2013 S( 2 ) 4,022 D $ 40.8646 ( 6 ) 22,250 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 $ 3.345 09/13/2013 M 1,667 09/11/2010( 7 ) 03/06/2016 Ordinary Shares 1,667 $ 0 0 D NQ Stock Options $ 11.065 09/13/2013 M 573 09/13/2011( 8 ) 09/10/2017 Ordinary Shares 573 $ 0 6,875 D NQ Stock Options $ 11.155 09/13/2013 M 610 09/12/2012( 9 ) 09/12/2018 Ordinary Shares 610 $ 0 14,625 D NQ Stock Options $ 29.87 09/13/2013 M 2,625 09/10/2013( 10 ) 09/10/2019 Ordinary Shares 2,625 $ 0 7,875 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 VP, FINANCE, TREASURER & PAO Signatures /s/ Roberta S Cohen by power of attorney 11/20/2013 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These transactions were omitted from the original Form 4 filed by the Reporting Person on September 17, 2013. ( 2 )Shares sold under a 10b5-1 Trading Plan. ( 3 )Ordinary Shares reported sold pursuant to a 10b5-1 trading plan to cover the tax liabilities relating to the vesting of restricted stock units under an award agreement dated September 12, 2011. ( 4 )Ordinary Shares reported sold pursuant to a 10b5-1 trading plan to cover the tax liabilities relating to the vesting of restricted stock units under an award agreement dated September 13, 2010. ( 5 )These Ordinary Shares were sold in multiple transactions at sales prices ranging from $41.10 to $41.11, 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 )These Ordinary Shares were sold in multiple transactions at sales prices ranging from $40.75 to $40.95, 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. ( 7 )Options granted to the Reporting Person under the Issuer's 2004 Stock Compensation Plan are subject to a four and one half year vesting schedule. One quarter of the option shares vested on September 11, 2010. The remaining options vested in equal monthly installments over the 36 months following September 11, 2010. ( 8 )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 vest in equal monthly installments over the 36 months following September 13, 2011. ( 9 )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. ( 10 )Options granted to the Reporting Person under the Issuer's 2012 Equity Incentive Plan are subject to a four-year vesting schedule. On e 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.

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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