SEC FORM 4

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

MORTON DAVID H JR

(Last)

(First)

(Middle)

SEAGATE TECHNOLOGY

920 DISC DRIVE

(Street)

SCOTTS VALLEY

950600

(City)

(State)

(Zip)

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)
	VP,FINANCE,TREASURER &PAO

3. Date of Earliest Transaction (Month/Day/Year)
09/12/2011

4. If Amendment, Date of 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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	09/12/2011		A		11,700⁽¹⁾	A	$0	32,323⁽²⁾	D
Ordinary Shares	09/13/2011		S		243	D	$11.3133⁽³⁾	32,080	D
Ordinary Shares	09/14/2011		S		872	D	$11.7633⁽⁴⁾	31,208	D
Ordinary Shares	09/14/2011		S		100	D	$11.76⁽⁴⁾	31,108	D

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 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: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
NQ Stock Options	$11.155	09/12/2011		A		29,250		09/12/2012⁽⁵⁾	09/12/2018	Ordinary Shares	29,250	$0.00	29,250	D

Explanation of Responses:

1. Includes 271 shares purchased on July 31, 2011 under the Employee Stock Purchase Plan at $11.8065 per share.

2. Consists of a grant of restricted stock units awarded to the Reporting Person under the 2004 Stock Compensation Plan for no consideration. Each restricted stock unit represents a contingent right to receive one share of Seagate ordinary shares. Subject to that Person's Continuous Service with the Company, vestedd shares to be released to the Reporting Person on each of the first four anniversaries of the vesting commencement date of September 12, 2011.

3. Shares sold pursuant to vesting provisions under the restricted stock unit award issued on Septmber 12, 2008. Shares sold to pay tax liabilities resulting from the vesting of 666 Restricted Stock Units on September 12, 2011. The sale was effected to a 10b5-1 trading plan.

4. Shares sold pursuant to vesting provisions under the restricted stock unit award issued on Septmber 13, 2010. Shares sold to pay tax liabilities resulting from the vesting of 2,750 Restricted Stock Units on September 13, 2011. The sale was effected to a 10b5-1 trading plan.

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 will vest on September 12, 2012. The remaining option shares vested proportionally each month over the 36 months following September 12, 2012.

	/S/ Roberta S Cohen for David H. Morton Jr.	09/14/2011
	** 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).
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