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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1137789	Seagate Technology Plc	STX	Computer Storage Devices (3572)	980648577

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1388390	D William Mosley	Seagate Technology 920 Disc Drive Scotts Valley CA 96066	Evp, Operations	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Ordinary Shares	Acquisiton	2011-04-01	19,286	$13.62	35,391	No	4	M	Direct
Ordinary Shares	Disposition	2011-04-01	19,286	$15.00	16,105	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Ordinary Shares	NQ Stock Option	Disposition	2011-04-01	19,286	$0.00	19,286	$13.62

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
45,215	2005-09-16	2011-09-16	No	4	M	Direct

Footnotes

Includes 682 shares purchased on January 31, 2011 under the Employee Stock Purchase Plan at $10.9905 per share.
Excludes 61,120 Performance Unit Shares and 22,000 Performance Shares previously reported on Mr. Mosley's Form 4 dated September 15, 2010. The vesting of of these awards remain subject to the achievement of performance goals that are not tied to the market price of the Company's ordinary shares. Pursuant to the Securities and Exchange Commission's interpretative guidance, these Performance Unit Shares and Performance Shares are not required to be reported on Mr. Mosley's Section 16 filings until such performance goals have been achieved.
The Sale reported on this Form 4 was affected by a 10b5-1 trading plan adopted by the Reporting Person on February 22, 2011.
Options granted to the Reporting Person under the 2001 Share Option Plan and are subject to a five-year vesting schedule. One quarter of the shares vested as of September 16, 2005. The remainder of the shares vested proportionally eache month over the 48 months following September 16, 2005.