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 *

LUCZO STEPHEN J 		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
__ X __ Officer (give title below)      _____ Other (specify below)
Chairman, President and CEO
(Last)          (First)          (Middle)

SEAGATE TECHNOLOGY PLC, 920 DISC DRIVE 		3. Date of Earliest Transaction (MM/DD/YYYY)

11/2/2011
(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   11/2/2011     M    300000   A $4.045   341250   (1) D    
Ordinary Shares   11/2/2011     S    300000   D $17   (2) 41250   D    
Ordinary Shares                  4605625   I   Stephen J Luczo Revocable Trust  
Ordinary Shares                  490367   I   Red Zone Holdings Limited Partnership  
Ordinary Shares                  425951   I   Red Zone II Limited Partnership  

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
NQ Stock Options   $4.045   11/2/2011     M         300000    1/12/2010   (3) 1/30/2016   Ordinary Shares   300000   $ 0   2885317   D    

Explanation of Responses:
( 1)  On July 8, 2011, the Compensation Committee of the Board of Directors of the Issuer authorized and confirmed that the performance metrics were met with respect to 37,500 or the 150,000 Performance Shares granted to Mr. Luczo on January 30, 2009 and reporeted on Mr. Luczo's Form 4 dated February 3, 2009.
( 2)  Shares were sold under a 10b5-1 plan adopted by the Reporting Person on May 27, 2011.
( 3)  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 January 12, 2010. The remaining option shares are vesting and will continue to vest proportionally each month over the 36 months following January 12, 2010.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
LUCZO STEPHEN J
SEAGATE TECHNOLOGY PLC
920 DISC DRIVE
SCOTTS VALLEY, CA 95067 		X
Chairman, President and CEO

Signatures
/S/ Roberta S. Cohen for Stephen J. Luczo 11/4/2011
** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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