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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 Plc 10200 S. De Anza Boulevard Cupertino CA 95014	Evp, Sales And Marketing	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	2011-11-04	100,000	$4.05	122,291	No	4	M	Direct
Ordinary Shares	Disposition	2011-11-04	100,000	$18.00	22,291	No	4	S	Direct
Ordinary Shares	Acquisiton	2011-11-07	19,814	$13.73	42,105	No	4	M	Direct
Ordinary Shares	Disposition	2011-11-07	19,814	$18.50	22,291	No	4	S	Direct
Ordinary Shares	Acquisiton	2011-11-07	1,019	$13.73	23,310	No	4	M	Direct
Ordinary Shares	Acquisiton	2011-11-07	10,000	$4.05	33,310	No	4	M	Direct
Ordinary Shares	Disposition	2011-11-07	11,019	$18.50	22,291	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	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	2011-11-04	100,000	$0.00	100,000	$4.05
Ordinary Shares	NQ Stock Option	Disposition	2011-11-04	19,814	$0.00	19,814	$13.73
Ordinary Shares	NQ Stock Option	Disposition	2011-11-07	1,019	$0.00	1,019	$13.73
Ordinary Shares	NQ Stock Option	Disposition	2011-11-07	10,000	$0.00	10,000	$4.05

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
550,000	2010-01-30	2016-01-30	No	4	M	Direct
30,186	2009-09-12	2015-09-12	No	4	M	Direct
29,167	2009-09-12	2015-09-12	No	4	M	Direct
540,000	2010-01-30	2016-01-30	No	4	M	Direct

Footnotes

Includes 686 shares purchased under the employee stock purchase plan on July 29, 2011.
On July 8, 2011, the Compensation Committee of the Board of Directors of the Issuer authorized and confirmed that the performance metrics were met with respect to 5,500 of the 22,000 Performance Shares granted to Mr. Mosley on September 13, 2010 and reported on Mr. Mosley's Form 4 dated September 15, 2010.
The Sale reported on this Form 4 was affected by a 10b5-1 trading plan adopted by the Reporting Person on May 24, 2011.
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 2004 Stock Compensation Plan are subject to a four-year vesting schedule. One quarter of the shares vested on January 30, 2010. The remaining shares vest proportionally each month over the 36 months following January 30, 2010.
Options granted to the Reporting Person under the 2004 Stock Compensation Plan and are subject to a four-year vesting schedule. One quarter of the shares vested as of September 12, 2009. The remainder of the shares vested proportionally each month over the 36 months following September 12, 2009.