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 * 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, 10200 S. DE ANZA BOULEVARD 3. Date of Earliest Transaction (Month/Day/Year) 08/27/2012 (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 08/27/2012   M   100,000 A $ 22.695 315,880 D   Ordinary Shares 08/27/2012   M   10,000 A $ 26.465 325,880 D   Ordinary Shares 08/27/2012   M   3,334 A $ 6.525 329,214 D   Ordinary Shares 08/27/2012   M   729,166 A $ 4.045 1,058,380 D   Ordinary Shares 08/27/2012   M   197,656 A $ 11.065 1,256,036 D   Ordinary Shares 08/27/2012   S   607,231 D $ 33.7702 (1) 648,805 D   Ordinary Shares 08/15/2012   G(2) V 25,000 D $ 0 2,329,692 I Stephen J Luczo Revocable Trust Ordinary Shares 08/22/2012   G(2) V 25,000 D $ 0 2,304,692 I Stephen J Luczo Revocable Trust Ordinary Shares               150,000 I Red Zone Holdings Limited Partnership Ordinary Shares               150,000 I Red Zone II Limited Partnership

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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 Options

$ 22.695

08/27/2012

M

100,000

10/26/2007(3)

10/26/2013

Ordinary Shares

100,000

$ 0

0

D

NQ Options

$ 26.465

08/27/2012

M

10,000

10/15/2008(4)

10/25/2014

Ordinary Shares

10,000

$ 0

0

D

NQ Options

$ 6.525

08/27/2012

M

3,334

10/15/2009(5)

10/30/2015

Ordinary Shares

3,334

$ 0

417

D

NQ Options

$ 4.045

08/27/2012

M

729,166

01/12/2010(6)

01/30/2016

Ordinary Shares

729,166

$ 0

364,584

D

NQ Options

$ 11.065

08/27/2012

M

197,656

09/13/2011(7)

09/13/2017

Ordinary Shares

197,656

$ 0

214,844

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
LUCZO STEPHEN J SEAGATE TECHNOLOGY PLC 10200 S. DE ANZA BOULEVARD CUPERTINO, CA 95014	X		Chairman, President and CEO

Signatures

/S/ Roberta S. Cohen for Stephen J. Luczo		08/29/2012
**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)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at sales prices ranging from $33.75 to $33.86, 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.
(2)	Reflects a gift of 25,000 ordinary shares on August 15, 2012 and a gift of 25,000 shares on August 22, 2012 to the Fidelity Investments Charitable Gift Fund.
(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 October 26, 2007. The remaining option shares vested proportionally annually thereafter on October 26.
(4)	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 October 15, 2008. The remaining option shares vest proportionally each month over the 36 months following October 15, 2008.
(5)	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 October 15, 2009. The remaining option shares vest proportionally each month over the 36 months following October 15, 2009.
(6)	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 vest proportionally each month over the 36 months following January 12, 2010.
(7)	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 option shares vest proportionally each month over the 36 months following September 13, 2011.

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