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
                                                                                  
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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(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

O MALLEY PATRICK J 		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 and CFO
(Last)          (First)          (Middle)

920 DISC DRIVE, ATTN: STOCK PLAN ADMINISTRATION 		3. Date of Earliest Transaction (MM/DD/YYYY)

8/15/2011
(Street)

SCOTTS VALLEY, CA 95067
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   8/15/2011     M    650000   A $5   682673.66   (1) D    
Ordinary Shares   8/15/2011     S    434414   D $11.9685   248259.66   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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
Nonqualified Stock Options   $5   8/15/2011     M         650000    1/31/2006   (2) 1/31/2012   Ordinary Shares   650000   $ 0   0   D    

Explanation of Responses:
( 1)  On July 8, 2010, the Compensation Committee of the Board of Directors of the Issuer authorized and confirmed that the performance metrics were met with respect to 6,000 of the 24,000 Performance Shares (the "2008 Shares") granted to Mr. O'Malley on September 12, 2008 and reported on Mr. O'Malley's Form 4 dated September 16, 2008. Further the Compensation Committee authorized and confirmed that the performance metrics were met with respect to 4,000 of the 16,000 Performance Shares (the "2010 Shares") granted to Mr. O'Malley on September 13, 2010 and reported on Mr. O'Malley's Form 4 dated September 15, 2010.
( 2)  Options granted to the Reporting Person under the Issuer's 2001 Share Option Plan are subject to a five-year vesting schedule. One fifth of the option shares vested January 31, 2006. The remaining option shares vested on January 31, 2007.

Remarks:
Sell to cover transaction.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
O MALLEY PATRICK J
920 DISC DRIVE
ATTN: STOCK PLAN ADMINISTRATION
SCOTTS VALLEY, CA 95067

EVP and CFO

Signatures
/S/ Roberta S. Cohen for Patrick J. O'Malley 8/15/2011
** Signature of Reporting Person Date


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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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