Seagate Technology — Director's Dealing 2011

Apr 27, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2011-04-25

Reporting Person: MORTON DAVID H JR (VP,FINANCE,TREASURER &PAO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-25	Ordinary Shares	M	1376	$13.62	Acquired	13978	Direct
2011-04-25	Ordinary Shares	M	1501	$15.74	Acquired	15479	Direct
2011-04-25	Ordinary Shares	M	2501	$15.065	Acquired	17980	Direct
2011-04-25	Ordinary Shares	M	16666	$3.345	Acquired	34646	Direct
2011-04-25	Ordinary Shares	S	22044	$18.00	Disposed	12602	Direct
2011-04-25	Ordinary Shares	M	7750	$13.73	Acquired	20352	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-25	NQ Stock Options	$13.62	M	1376	Disposed	2011-09-16	Ordinary Shares (1376)	Direct
2011-04-25	NQ Stock Options	$15.74	M	1501	Disposed	2012-10-03	Ordinary Shares (1501)	Direct
2011-04-25	NQ Stock Options	$15.065	M	2501	Disposed	2012-09-27	Ordinary Shares (2501)	Direct
2011-04-25	NQ Stock Options	$3.345	M	16666	Disposed	2016-03-06	Ordinary Shares (16666)	Direct
2011-04-25	NQ Stock Options	$13.73	M	7750	Disposed	2013-09-12	Ordinary Shares (7750)	Direct

Footnotes

F1: 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, 2005. The remaining option shares vested proportionally each month over the 36 months following September 16, 2005.

F2: 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 3, 2006. The remaining option shares vested proportionally each month over the 36 months following October 3, 2006.

F3: 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 September 27, 2006. The remaining option shares vested proportionally each month over the 36 months following September 26, 2006.

F4: Options granted to the Reporting Person under the Issuer's 2004 Stock Compensation Plan are subject to a four and one-half year vesting schedule. One quarter of the option shares vested on September 11, 2010. The remaining option shares vested proportionally each month over the 36 months following September 11, 2010.

F5: 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 September 12, 2009. The remaining option shares vested proportionally each month over the 36 months following September 12, 2009.