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 OF SECURITIES 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 * MASSARONI KENNETH M   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) EVP,General Counsel, CAO (Last) (First) (Middle) SEAGATE TECHNOLOGY PLC, 10200 S. DE ANZA BOULEVARD 3. Date of Earliest Transaction (Month/Day/Year) 09/16/2013 (Street) CUPERTINO, CA 95014 4. If Amendment, Date Original Filed(Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 09/16/2013   S(1)   1,200 D $ 41.0229 47,427 D   Ordinary Shares 09/16/2013   M   4,000 A $ 3.345 51,427 D   Ordinary Shares 09/16/2013   M   1,750 A $ 11.065 53,177 D   Ordinary Shares 09/16/2013   S(2)   5,750 D $ 40.85 47,427 D

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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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

09/16/2013

M

4,000

09/11/2010(3)

03/06/2016

Ordinary Shares

4,000

$ 0

5,000

D

NQ Stock Options

$ 11.065

09/16/2013

M

1,750

09/13/2011(4)

09/13/2017

Ordinary Shares

1,750

$ 0

16,250

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MASSARONI KENNETH M SEAGATE TECHNOLOGY PLC 10200 S. DE ANZA BOULEVARD CUPERTINO, CA 95014			EVP,General Counsel, CAO

Signatures

/s/ Roberta S. Cohen by power of attorney		09/17/2013
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	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.
(2)	Shares sold under a 10b5-1 Trading Plan.
(3)	Options granted to the Reporting Person under the Seagate Technology 2004 Stock Compensation Plan are subject to a four and one half year vesting schedule. One quarter of the options vested on September 11, 2010. Following continuous employment, the remaining options vested proportionately over the 36 months following September 11, 2010.
(4)	Options granted to the Reporting Person under the Seagate Technology 2001 Stock Option Plan are subject to a four year vesting schedule. One quarter of the options vested on September 13, 2011. Following continuous employment, the remaining options vest proportionately over the 36 months following September 13, 2011.

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