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 *
Nygaard Jeffrey D.
   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)
Executive Vice President
(Last)
(First)
(Middle)
10200 S. DE ANZA BOULEVARD		 3. Date of Earliest Transaction (Month/Day/Year)
09/09/2018
(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 09/09/2018   M   1,040 A $ 0 6,686 D  
Ordinary Shares 09/09/2018   M   1,251 A $ 0 7,937 D  
Ordinary Shares 09/09/2018   M   3,031 A $ 0 10,968 D  
Ordinary Shares 09/09/2018   F   2,343 (1) D $ 49.8 8,625 D  
Ordinary Shares               23,612 I Jeffrey D. Nygaard Revocable Trust U/A Dated August 17, 2009

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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
Restricted Share Unit (2) 09/09/2018   M     1,040   (3) 09/09/2018 Ordinary Shares 1,040 $ 0 0 D  
Restricted Share Unit (2) 09/09/2018   M     1,251   (4) 09/09/2019 Ordinary Shares 1,251 $ 0 1,252 D  
Restricted Share Unit (2) 09/09/2018   M     3,031   (5) 09/09/2020 Ordinary Shares 3,031 $ 0 6,063 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Nygaard Jeffrey D.
10200 S. DE ANZA BOULEVARD
CUPERTINO, CA 95014		       Executive Vice President  

Signatures

 /s/ Jolene A. Mendelsohn Attorney-in-Fact for Jeffrey D. Nygaard   09/11/2018
**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) These Ordinary Shares are withheld securities to cover tax liabilities incident to the vesting of Restricted Share Units ("RSUs").
(2) Each RSU represents a contingent right to receive one ordinary share of Issuer.
(3) The RSUs, originally granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan (the "Plan") for 4,160 shares, of which all 4,160 shares have been released, vest as to one-quarter of the shares on September 9, 2015 and each one-year anniversary thereafter.
(4) The RSUs, originally granted to the Reporting Person under the Plan for 5,006 shares, of which 3,753 shares have been released, vest as to one-quarter of the shares on September 9, 2016 and each one-year anniversary thereafter.
(5) The RSUs, originally granted to the Reporting Person under the Plan for 12,125 shares, of which 6,062 shares have been released, vest as to one-quarter of the shares on September 9, 2017 and each one-year anniversary thereafter.

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