Seagate Technology — Director's Dealing 2011

Apr 20, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2011-04-19

Reporting Person: MOSLEY WILLIAM D (EVP, Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-19	Ordinary Shares	M	10000	$15.065	Acquired	26104.5977	Direct
2011-04-19	Ordinary Shares	M	20000	$13.73	Acquired	46104.5977	Direct
2011-04-19	Ordinary Shares	S	30000	$18.00	Disposed	16104.5977	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-19	NQ Stock Option	$15.065	M	10000	Disposed	2012-09-27	Ordinary Shares (10000)	Direct
2011-04-19	NQ Stock Option	$13.73	M	20000	Disposed	2015-09-12	Ordinary Shares (20000)	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 2004 Stock Compensation Plan and are subject to a four-year vesting schedule. One quarter of the shares vested as of September 27, 2006. The remainder of the shares vested proportionally eache month over the 36 months following September 27, 2006.

F3: 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 eache month over the 36 months following September 12, 2009.