Ownership Submission
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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(Print or Type Responses)
1. Name and Address of Reporting Person *
PARK CHONG SUP
  2. Issuer Name and Ticker or Trading Symbol
Seagate Technology plc [STX]
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)
SEAGATE TECHNOLOGY PLC, 10200 S. DE ANZA BOULEVARD
3. Date of Earliest Transaction (Month/Day/Year)
05/02/2013
(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 05/02/2013   M   626 A $ 6.525 19,729 D  
Ordinary Shares 05/02/2013   M   7,083 A $ 14.825 26,812 D  
Ordinary Shares 05/02/2013   S   7,709 D $ 38.05 (1) 19,103 D  
Ordinary Shares 05/06/2013   M   1,666 A $ 14.825 20,769 D  
Ordinary Shares 05/06/2013   S   1,666 D $ 41.951 19,103 D  
Ordinary Shares 05/06/2013   S   5,000 D $ 41.9515 (2) 21,698 I The Park Family Trust

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 $ 6.525 05/02/2013   M     626 10/15/2009(3) 10/30/2015 Ordinary Shares 626 $ 0 0 D  
NQ Stock Options $ 14.825 05/02/2013   M     7,083 10/15/2010(4) 10/30/2016 Ordinary Shares 7,083 $ 0 2,917 D  
NQ Stock Options $ 14.825 05/06/2013   M     1,666 10/15/2010(4) 10/30/2016 Ordinary Shares 1,666 $ 0 1,251 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
PARK CHONG SUP
SEAGATE TECHNOLOGY PLC
10200 S. DE ANZA BOULEVARD
CUPERTINO, CA 95014
  X      

Signatures

 /s/ Roberta S. Cohen by power of attorney   05/06/2013
**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) Shares sold under a 10b5-1 Trading Plan.
(2) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at sales prices ranging from 41.95 to 41.96, 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 range set forth in this footnote.
(3) Options granted to the Reporting Person under the Seagate Technology 2004 Stock Compensation Plan are subject to a four year vesting schedule. Subject to continuous employment, one quarter of the option shares vested on October 15, 2009. The remaining options vested in equal installments over the 36 months following October 15, 2009.
(4) Options granted to the Reporting Person under the Seagate Technology 2004 Stock Compensation Plan are subject to a four year vesting schedule. Subject to continuous employment, one quarter of the option shares vested on October 15, 2010. The remaining options vest in equal installments over the 36 months following October 15, 2010.

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