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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	2012-05-01	10,000	$11.07	63,704	No	4	M	Direct
Ordinary Shares	Disposition	2012-05-01	10,000	$32.00	53,704	No	4	S	Direct
Ordinary Shares	Acquisiton	2012-05-01	20,000	$13.73	73,704	No	4	M	Direct
Ordinary Shares	Disposition	2012-05-01	20,000	$31.94	53,704	No	4	S	Direct
Ordinary Shares	Acquisiton	2012-05-01	50,000	$24.63	103,704	No	4	M	Direct
Ordinary Shares	Disposition	2012-05-01	50,000	$31.87	53,704	No	4	S	Direct
Ordinary Shares	Acquisiton	2012-05-01	50,000	$25.52	103,704	No	4	M	Direct
Ordinary Share	Disposition	2012-05-01	50,000	$31.88	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	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct
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 Options	Disposition	2012-05-01	10,000	$0.00	10,000	$11.07
Ordinary Shares	NQ Stock Options	Disposition	2012-05-01	20,000	$0.00	20,000	$13.73
Ordinary Shares	NQ Stock Options	Disposition	2012-05-01	50,000	$0.00	50,000	$24.63
Ordinary Shares	NQ Stock Options	Disposition	2012-05-01	50,000	$0.00	50,000	$25.52

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
70,000	2011-09-13	2017-09-13	No	4	M	Direct
50,000	2009-09-12	2015-09-12	No	4	M	Direct
325,000	2008-09-13	2014-09-13	No	4	M	Direct
75,000	2007-02-03	2013-02-03	No	4	M	Direct

Footnotes

Options granted to the Reporting Person under the Issuer's 2001 Share Option Plan are subject to a four year vesting schedule. One quarter of the option shares vested on September 13, 2011. The remaining option shares vest proportionally each month over the 36 months following September 13, 2011.
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 September 12, 2009. The remaining option shares vest proportionally each month over the 36 months following September 12, 2009.
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 September 13, 2008. The remaining option shares vest proportionally each month over the 36 months following September 13, 2008.
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 February 3, 2007. The remaining option shares vest proportionally each month over the 36 months following February 3, 2007.