Seagate Technology — Director's Dealing 2011

Apr 8, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2011-04-06

Reporting Person: MOSLEY WILLIAM D (EVP, Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-06	Ordinary Shares	M	45215	$13.62	Acquired	61319.5977	Direct
2011-04-06	Ordinary Shares	S	45215	$15.00	Disposed	16104.5977	Direct
2011-04-08	Ordinary Shares	M	7293	$10.00	Acquired	23397.5977	Direct
2011-04-08	Ordinary Shares	M	23835	$10.89	Acquired	47232.5977	Direct
2011-04-08	Ordinary Shares	S	31128	$16.00	Disposed	16104.5977	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-06	NQ Stock Option	$13.62	M	45215	Disposed	2011-09-16	Ordinary Shares (45215)	Direct
2011-04-08	NQ Stock Option	$10.00	M	7293	Disposed	2011-09-16	Ordinary Shares (7293)	Direct
2011-04-08	NQ Stock Option	$10.89	M	23835	Disposed	2013-04-11	Ordinary Shares (23835)	Direct

Footnotes

F1: The Sale reported on this Form 4 was affected by a 10b5-1 trading plan adopted by the Reporting Person on February 22, 2011.

F2: 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.

F3: 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 16, 2003. The remaining option shares vested proportionally each month over the 36 months following September 16, 2003.

F4: Options granted to the Reporting Person under the Issuer's 2001 Share Option Plan are subject to a five-year vesting schedule. One fifth of the option shares vested on April 11, 2004. The remaining option shares vested proportionally each month over the 48 months following April 11, 2004.