Seagate Technology — Director's Dealing 2012

Feb 9, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2012-02-07

Reporting Person: MARSHALL LYDIA MICHEAUX (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-07	Ordinary Shares	M	25000	$14.31	Acquired	69166	Direct
2012-02-07	Ordinary Shares	M	90000	$12.755	Acquired	159166	Direct
2012-02-07	Ordinary Shares	S	115000	$26.7167	Disposed	44166	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-07	NQ Stock Options	$14.31	M	25000	Disposed	2012-10-27	Ordinary Shares (25000)	Direct
2012-02-07	NQ Stock Options	$12.755	M	90000	Disposed	2014-04-29	Ordinary Shares (90000)	Direct

Footnotes

F1: 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 October 27, 2006. The remaining option shares vested proportionally monthly ovr the 36 months following October 26, 2006.

F2: Options granted to the Reporting Person under the Issuer's 2001 Share Optioin Plan is subject to a four-year vesting schedule. One-quarter of the option shares vested on April 29, 2005. The remaining option shares vested proportionally monthly ovr the 36 months following April 29, 2005.