Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

Nygaard Jeffrey D.

2. Date of Event Requiring Statement (MM/DD/YYYY) 10/17/2017

3. Issuer Name and Ticker or Trading Symbol

Seagate Technology plc [STX]

(Last) (First) (Middle)

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)
Executive Vice President /

(Street)

CUPERTINO, CA 95014

(City) (State) (Zip)

5. 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 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	18133	I	Jeffrey D. Nygaard Revocable Trust U/A Dated August 17, 2009

*Table II - Derivative Securities Beneficially Owned ( e.g.* , puts, calls, warrants, options, convertible securities)**
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		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)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
NQ Stock Option	⁽¹⁾	9/11/2024	Ordinary Shares	24870.0	$30.95	D
NQ Stock Option	⁽²⁾	9/9/2023	Ordinary Shares	30310.0	$36.09	D
NQ Stock Option	⁽³⁾	9/9/2022	Ordinary Shares	9380.0	$50.1	D
NQ Stock Option	⁽⁴⁾	9/9/2021	Ordinary Shares	7800.0	$60.83	D
NQ Stock Option	⁽⁵⁾	9/9/2020	Ordinary Shares	10969.0	$40.16	D
NQ Stock Option	⁽⁶⁾	9/10/2019	Ordinary Shares	2188.0	$29.87	D
Performance-Based Restricted Share Units	⁽⁷⁾	9/11/2020	Ordinary Shares	8705.0	$0.0	D
Performance-Based Restricted Share Units	⁽⁸⁾	9/9/2019	Ordinary Shares	10610.0	$0.0	D
Performance-Based Restricted Share Units	⁽⁹⁾	9/9/2018	Ordinary Shares	4380.0	$0.0	D
Restricted Share Unit	⁽¹⁰⁾	9/11/2021	Ordinary Shares	9950.0	$0.0	D
Restricted Share Unit	⁽¹¹⁾	9/9/2020	Ordinary Shares	9094.0	$0.0	D
Restricted Share Unit	⁽¹²⁾	9/9/2019	Ordinary Shares	2503.0	$0.0	D
Restricted Share Unit	⁽¹³⁾	9/9/2018	Ordinary Shares	1040.0	$0.0	D

Explanation of Responses:
(1)	Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options will vest on September 11, 2018. The remaining options will vest in equal monthly installments over the 36 months following September 11, 2018.
(2)	Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2017. The remaining options will vest in equal monthly installments over the 36 months following September 9, 2017.
(3)	Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2016. The remaining options will vest in equal monthly installments over the 36 months following September 9, 2016.
(4)	Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2015. The remaining options will vest in equal monthly installments over the 36 months following September 9, 2015.
(5)	Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 9, 2014. The remaining options vested in equal monthly installments over the 36 months following September 9, 2014.
(6)	Options granted to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan are subject to a four-year vesting schedule. Subject to continuous employment, one quarter of the options vested on September 10, 2013. The remaining options vested in equal monthly installments over the 36 months following September 10, 2013.
(7)	Each performance-based restricted share unit ("PSU") represents a contingent right to receive one share of Seagate Technology plc's ordinary share. The number of PSUs that may be earned is between 0% and 200% of the target number of PSUs and shall vest based on ROIC and relative TSR performance over the three-year performance period ending on September 11, 2020.
(8)	Each performance-based restricted share unit ("PSU") represents a contingent right to receive one share of Seagate Technology plc's ordinary share. The number of PSUs that may be earned is between 0% and 200% of the target number of PSUs and shall vest based on ROIC and relative TSR performance over the three-year performance period ending on September 9, 2019.
(9)	Each performance-based restricted share unit ("PSU") represents a contingent right to receive one share of Seagate Technology plc's ordinary share. The number of PSUs that may be earned is between 0% and 200% of the target number of PSUs and shall vest based on ROIC and relative TSR performance over the three-year performance period ending on September 9, 2018.
(10)	Consists of a grant of restricted share units ("RSUs") awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. The RSUs will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 11, 2017.
(11)	Consists of a grant of restricted share units ("RSUs") awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. The RSUs will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 9, 2016.
(12)	Consists of a grant of restricted share units ("RSUs") awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. The RSUs will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 9, 2015.
(13)	Consists of a grant of restricted share units ("RSUs") awarded to the Reporting Person under the Seagate Technology plc 2012 Equity Incentive Plan. The RSUs will be converted into ordinary shares on a one-for-one basis. Subject to the Reporting Person's continuous employment, such RSUs will be settled in ordinary shares in equal installments on each of the first four anniversaries of September 9, 2014.

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

Signatures
/s/ Suhani Akhare Attorney-in-Fact for Jeffrey D. Nygaard		10/27/2017
^** 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 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).
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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