Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  RE MARK
 2. Date of Event Requiring Statement (Month/Day/Year)
07/01/2013		 3. Issuer Name and Ticker or Trading Symbol
Seagate Technology plc [STX]
(Last)
(First)
(Middle)
SEAGATE TECHNOLOGY PLC, 10200 S. DE ANZA BOULEVARD		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP & Chief Technical Officer
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CUPERTINO, CA 95014		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Ordinary Shares 44,379.503 (1) (2) (3) (4)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
NQ Stock Options 09/11/2010(5) 03/06/2016 Oridinary Shares 16,667 $ 3.345 D  
NQ Stock Options 09/13/2011(6) 09/13/2017 Ordinary Shares 19,792 $ 11.065 D  
NQ Stock Options 03/08/2012(7) 03/21/2018 Ordinary Shares 56,000 $ 13.365 D  
NQ Stock Options 09/12/2012(8) 09/12/2018 Ordinary Shares 50,800 $ 11.155 D  
NQ Stock Options 09/10/2013(9) 09/10/2019 Ordinary Shares 18,030 $ 29.87 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
RE MARK
SEAGATE TECHNOLOGY PLC
10200 S. DE ANZA BOULEVARD
CUPERTINO, CA 95014		       SVP & Chief Technical Officer  

Signatures

/s/ Roberta S. Cohen by power-of-attorney 07/03/2013
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) Includes a grant of restricted stock units of which 6,000 remain outstanding awarded to the Reporting Person. The restricted stock units will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such restricted stock units will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 13, 2010.
(2) Includes a grant of restricted stock units of which 4,800 remain outstanding awarded to the Reporting Person. The restricted stock units will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such restricted stock units will be settled in ordinary shares in equal installments on each of the first four anniversaries of March 8, 2011.
(3) Includes a grant of restricted stock units of which 12,750 remain outstanding awarded to the Reporting Person. The restricted stock units will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such restricted stock units will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 12, 2011.
(4) Includes a grant of restricted stock units of which 11,536 remain outstanding awarded to the Reporting Person. The restricted stock units will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such restricted stock units will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 10, 2012.
(5) Options granted to the Reporting Person under the Issuer's 2004 Stock Compensation Plan are subject to a four and a half year vesting schedule. One quarter of the ordinary shares vested on September 11, 2010. Following continuous employment, the remaining options vest in equal monthly installments over the 36 months following September 11, 2010
(6) 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 ordinary shares vested on September 13, 2011. The remaining options vest in equal monthly installments over the 36 months following September 13, 2011.
(7) 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 ordinary shares vested on March 8, 2012. The remaining options will vest in equal monthly installments over the 36 months following March 8, 2012.
(8) 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 ordinary shares vested on September 12, 2012. The remaining options will vest in equal monthly installments over the 36 months following September 12, 2012.
(9) Options granted to the Reporting Person under the Issuer's 2012 Incentive Equity Award Plan are subject to a four-year vesting schedule. One quarter of the ordinary shares vested on September 10, 2013. The remaining options will vest in equal monthly installments over the 36 months following September 10, 2013.
 
Remarks:
EXHIBIT INDEX
Exhibit 24-Power of Attorney

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