Seagate Technology — Director's Dealing 2012

Feb 3, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2012-02-01

Reporting Person: MOSLEY WILLIAM D (EVP, Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-01	Ordinary Shares	M	16302	$11.065	Acquired	30592.5977	Direct
2012-02-01	Ordinary Shares	M	83698	$4.045	Acquired	114290.5977	Direct
2012-02-01	Ordinary Shares	S	16302	$23.7052	Disposed	97988.5977	Direct
2012-02-01	Ordinary Shares	S	83698	$23.7179	Disposed	14290.5977	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-01	NQ Stock Options	$11.065	M	16302	Disposed	2016-09-13	Ordinary Shares (16302)	Direct
2012-02-01	NQ Stock Options	$4.045	M	83698	Disposed	2016-01-30	Ordinary Shares (83698)	Direct

Footnotes

F1: Shares were sold under a 10b5-1 trading plan adopted by the Reporting Person on January 13, 2012.

F2: Options granted 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, 2010. The remaining shares are vesting and will continue to vest proportionally each month over the 36 months following September 13, 2010.

F3: Options granted 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 January 30, 2010. The remaining shares are vesting and will continue to vest proportionally each month over the 36 months following January 30, 2010