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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
1310378	W Robert Whitmore	Seagate Technology Plc 10200 S. De Anza Boulevard Cupertino CA 95014	Evp & Chief Technical Officer	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
Ordinary Shares	Acquisiton	2011-11-08	85,200	$4.05	146,158	No	4	M	Direct
Ordinary Shares	Disposition	2011-11-08	85,200	$18.03	60,958	No	4	S	Direct
Ordinary Shares	Disposition	2011-11-09	7,254	$17.56	53,704	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	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 Options	Disposition	2011-11-08	85,200	$0.00	85,200	$4.05

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
614,800	2010-01-12	2016-01-30	No	4	M	Direct

Footnotes

On July 8, 2011, the Compensation Committee of the Board of Directors of the Issuer authorized and confirmed that the peformance metrics were met with respect to 10,500 of the 42,000 Performance Shares granted to Mr. Whitmore on September 13, 2007 and reported on Mr. Whitmore's Form 4 dated September 17, 2007. Further the Compensation Committee also confirmed that the performance metrics were met with respect to 2,090 of the 8,360 Peformance Shares granted on September 12, 2008 and reported on September 16, 2008 and that the performance metrics were met with respect to 4,000 of the 16,000 Performance Shares granted on September 13, 2010 and reported on September 15, 2010.
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 vested on January 12, 2010. The remaining option shares vested proportionally each month over the 36 months following January 12, 2010.