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: O MALLEY PATRICK J (EVP & Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-01	Ordinary Shares	M	117500	$25.48	Acquired	503206.659	Direct
2012-05-01	Ordinary Shares	S	117500	$31.900	Acquired	385706.659	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-01	NQ Stock Options	$25.48	M	117500	Disposed	2013-04-27	Ordinary Shares (117500)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Oridnary Shares	281800	Indirect

Footnotes

F1: Shares sold by the Reporting Person under a 10b5-1 Trading Plan effective on February 29, 2012.

F2: Options granted to the Reporting Person under the Issuer's 2004 Stock Compensation Plan are subject to a five-year vesting schedule. One half of the option shares vested on April 27, 2010. The remaining option shares vested on April 27, 2011.