Seagate Technology — Director's Dealing 2012

Jan 13, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2012-01-12

Reporting Person: MOSLEY WILLIAM D (EVP, Sales and Marketing)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-01-12	Ordinary Shares	M	17500	$13.73	Acquired	31790.5977	Direct
2012-01-12	Ordinary Shares	M	29166	$4.045	Acquired	60956.5977	Direct
2012-01-12	Ordinary Shares	S	26666	$19.00	Disposed	34290.5977	Direct
2012-01-12	Ordinary Shares	S	20000	$19.00	Disposed	14290.5977	Direct
2012-01-13	Ordinary Shares	M	20000	$4.045	Acquired	34290.5977	Direct
2012-01-13	Ordinary Shares	S	20000	$19.50	Disposed	14290.5977	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-01-12	NQ Stock Options	$13.73	M	17500	Disposed	2015-09-12	Ordinary Shares (17500)	Direct
2012-01-12	NQ Stock Options	$4.045	M	29166	Disposed	2016-01-30	Ordinary Shares (29166)	Direct
2012-01-13	NQ Stock Options	$4.045	M	20000	Disposed	2016-01-30	Ordinary (20000)	Direct

Footnotes

F1: Shares were sold under a 10b5-1 trading plan adopted by the Reporting Person on May 24, 2011.

F2: Shares were sold under a 10b5-1 trading plan adopted by the Reporting Person on February 22, 2011.

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

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 September 12, 2009. The remaining shares are vesting and will continue to vest proportionally each month over the 36 months following September 12, 2009.