Seagate Technology — Director's Dealing 2011

Dec 1, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2011-11-30

Reporting Person: MORTON DAVID H JR (VP, FINANCE, TREASURER &PAO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-11-30	Ordinary Shares	M	3667	$3.345	Acquired	34775	Direct
2011-11-30	Ordinary Shares	S	1809	$17.1248	Disposed	32966	Direct
2011-11-30	Ordinary Shares	M	8020	$11.065	Acquired	40986	Direct
2011-11-30	Ordinary Shares	S	6253	$17.1248	Disposed	34733	Direct
2011-11-30	Ordinary Shares	M	1750	$13.73	Acquired	36483	Direct
2011-11-30	Ordinary Shares	S	1538	$17.1248	Acquired	34945	Direct
2011-11-30	Ordinary Shares	M	8000	$3.345	Acquired	42945	Direct
2011-11-30	Ordinarty Shares	S	8000	$17.0795	Disposed	34945	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-11-30	NQ Stock Options	$3.345	M	11667	Disposed	2016-03-06	Ordinary Shares (11667)	Direct
2011-11-30	NQ Stock Options	$11.065	M	8020	Disposed	2017-09-13	Ordinary Shares (8020)	Direct
2011-11-30	NQ Stock Options	$13.73	M	1750	Disposed	2015-09-12	Ordinary Shares (1750)	Direct

Footnotes

F1: Sell-to-Cover transaction.

F2: Options granted to the Reporting Person under the Issuer's 2004 Stock Compensation Plan are subject to a four and one-half year vesting schedule. One quarter of the option shares vested on September 11, 2010. The remaining option shares vest proportionally each month over the 36 months following September 11, 2010.

F3: Options granted to the Reporting Person under the Issuer's 2001 Share Option Plan are subject to a four-year vesting schedule. One quarter of the option shares vested on September 13, 2011. The remaining option shares vest proportionally each month over the 36 months following September 13, 2011.

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 option shares vest proportionally each month over the 36 months following September 12, 2009.