Seagate Technology — Director's Dealing 2012

Mar 1, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2012-02-29

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-29	Ordinary Shares	M	5000	$3.345	Acquired	40215	Direct
2012-02-29	Ordinary Shares	M	750	$13.73	Acquired	40965	Direct
2012-02-29	Ordinary Shares	M	1719	$11.065	Acquired	42684	Direct
2012-02-29	Ordinary Shares	S	7469	$27.2839	Disposed	35215	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-29	NQ Stock Options	$3.345	M	5000	Disposed	2016-03-06	Ordinary Shares (5000)	Direct
2012-02-29	NQ Stock Options	$13.73	M	750	Disposed	2015-09-12	Ordinary Shares (750)	Direct
2012-02-29	NQ Stock Options	$11.065	M	1719	Disposed	2017-09-13	Ordinary Shares (1719)	Direct

Footnotes

F1: Includes 270 shares purchased under the Employee Stock Purchase Plan on January 31, 2012 at $11.764 per share.

F2: 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. Remaining option shares vest proportionally each month over the 36 months following September 11, 2010.

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

F4: 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 13, 2011. The remaining option shares vest proportionally each month over the 36 months following September 13, 2011.