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: MOSLEY WILLIAM D (EVP, Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-01	Ordinary Shares	M	150000	$4.045	Acquired	164974.5977	Direct
2012-05-01	Ordinary Shares	S	150000	$32.00	Disposed	14974.5977	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-01	NQ Stock Options	$4.0045	M	150000	Disposed	2016-01-30	Ordinary (150000)	Direct

Footnotes

F1: Shares were sold under a 10b5-1 Trading Plan adopted by the Reporting Person on February 13, 2012.

F2: Options granted the Reporting Person under the Issuer's 2004 Stock Compensation Plan are subject to the following vesting schedule. On quarter of the shares vested on January 30, 2010. The remaining shares will vest monthly proporionally over the 36 months following January 30, 2010.