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^*

MOSLEY WILLIAM D

(Last)

(First)

(Middle)

SEAGATE TECHNOLOGY

920 DISC DRIVE

(Street)

SCOTTS VALLEY

96066

(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)
	EVP, Sales and Marketing

3. Date of Earliest Transaction (Month/Day/Year)
09/13/2010

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)
Performance Stock Shares	09/13/2010		A		22,000⁽¹⁾	A	$0.000	39,922.5977	D
Performance Stock Units	09/13/2010		A		61,120⁽²⁾	A	$0.000	101,042.5977	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	$11.065	09/13/2010		A		137,500		09/13/2011⁽³⁾	09/13/2017	Common Shares	137,500	$0.00	137,500	D

Explanation of Responses:

1. Consists of a grant of restricted stock shares awarded to the Reporting Person under the 2004 Stock Compensation Plan for no consideration. Each restricted stock share represents a contingent right to receive one share of Seagate common stock. Subject to the Reporting Person's Continuous Service with the Coompany, vested shares to be released to the reporting person on each of the first four anniversaries of the vesting commencement date of September 13, 2010.

2. Consists of a grant of performance stock units awarded to the Reporting Person under the 2004 Stock Compensation Plan for no consideration. Each performance stock unit represents a contingent right to receive one share of Seagate common stock. The vesting for these awards issued under the 2004 Stock Compensation Plan is subject to both continuous employment and specified performance goals.The Award Agreement provides that performance units will vest after the end of a performance period, currently contemplated to be three years, subject to both the continued employment of the participant by the Company and the achievement of certain performance objectives established by the Board of Directors and set forth in the Award Agreement. The Board of Directors presently intends that the performance goals will be a three-year average return on invested capital goal and a relative total shareholder return percentile goal.

3. Options granted to the Reporting Person under the 2004 Stock Compensation Plan are subject to a four-year vesting schedule. One quarter of the option shares vested on September 13, 2011. The remaining option shares are vesting proportionally each month over the 36 months following September 13, 2011.

	/S/ Roberta S Cohen for William D Mosley	09/15/2010
	** 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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