Seagate Technology — Director's Dealing 2012

Jun 1, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2012-06-01

Reporting Person: MASSARONI KENNETH M (EVP,General Counsel, CAO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-06-01	Ordinary Shares	M	15000	$3.345	Acquired	35429	Direct
2012-06-01	Ordinary Shares	S	5000	$22.8147	Disposed	30429	Direct
2012-06-01	Ordinary Shares	S	10000	$22.8147	Disposed	20429	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-06-01	NQ Stock Options	$3.345	M	15000	Disposed	2016-03-06	Ordinary Shares (15000)	Direct

Footnotes

F1: Shares were sold under a 10b5-1 Trading Plan adopted by the Reporting Person on November 17, 2011.

F2: Shares were sold under a 10b5-1 Trading Plan adopted by the Reporting Person on May 10, 2012.

F3: Options granted to the Reporting Person under the Seagate Technology's 2004 Stock Compensation Plan are subject to a four and half year vesting schedule. One quarter of the option shares vested on September 11, 2010 . Following continuous employment, the remaining shares vest proportionally monthly over the 36 months following September 11, 2010.