Seagate Technology — Director's Dealing 2012

May 3, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2012-05-01

Reporting Person: Whitmore Robert W (EVP & Chief Technical Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-01	Ordinary Shares	M	10000	$11.065	Acquired	63704	Direct
2012-05-01	Ordinary Shares	S	10000	$32.0032	Disposed	53704	Direct
2012-05-01	Ordinary Shares	M	20000	$13.73	Acquired	73704	Direct
2012-05-01	Ordinary Shares	S	20000	$31.9419	Disposed	53704	Direct
2012-05-01	Ordinary Shares	M	50000	$24.63	Acquired	103704	Direct
2012-05-01	Ordinary Shares	S	50000	$31.8738	Disposed	53704	Direct
2012-05-01	Ordinary Shares	M	50000	$25.515	Acquired	103704	Direct
2012-05-01	Ordinary Share	S	50000	$31.8755	Disposed	53704	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-01	NQ Stock Options	$11.065	M	10000	Disposed	2017-09-13	Ordinary Shares (10000)	Direct
2012-05-01	NQ Stock Options	$13.73	M	20000	Disposed	2015-09-12	Ordinary Shares (20000)	Direct
2012-05-01	NQ Stock Options	$24.63	M	50000	Disposed	2014-09-13	Ordinary Shares (50000)	Direct
2012-05-01	NQ Stock Options	$25.515	M	50000	Disposed	2013-02-03	Ordinary Shares (50000)	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 13, 2011. The remaining option shares vest proportionally each month over the 36 months following September 13, 2011.

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

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 13, 2008. The remaining option shares vest proportionally each month over the 36 months following September 13, 2008.

F4: 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 February 3, 2007. The remaining option shares vest proportionally each month over the 36 months following February 3, 2007.