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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
1423091	M Kenneth Massaroni	Seagate Technology Plc 10200 S. De Anza Boulevard Cupertino CA 95014	Evp,General Counsel, Cao	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	2012-09-04	10,000	$3.35	47,659	No	4	M	Direct
Ordinary Shares	Acquisiton	2012-09-04	10,000	$13.73	57,659	No	4	M	Direct
Ordinary Shares	Disposition	2012-09-04	20,000	$32.10	37,659	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
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 Options	Disposition	2012-09-04	10,000	$0.00	10,000	$3.35
Ordinary Shares	NQ Options	Disposition	2012-09-04	10,000	$0.00	10,000	$13.73

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
115,000	2010-09-11	2016-03-06	No	4	M	Direct
17,500	2009-09-12	2015-09-12	No	4	M	Direct

Footnotes

Shares were sold under a 10b5-1 Trading Plan.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at sales prices ranging from $31.99 to $32.23, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
Options granted to the Reporting Person under the Seagate Technology 2004 Stock Compensation Plan are subject to a four and a half year vesting schedule. One quarter of the option shares vested on September 11, 2010. Following continuous employment, the remaining shares vest proportionally monthly over the 36 months following September 11, 2010.
Options granted to the Reporting Person under the Seagate Technology 2004 Stock Compensation Plan are subject to a four year vesting schedule. One quarter of the option shares vested on September 12, 2009. Following continuous employment, the remaining shares vest proportionally monthly over the 36 months following September 12, 2009.