Seagate Technology — Director's Dealing 2012

Mar 9, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2012-03-08

Reporting Person: MOSLEY WILLIAM D (EVP, Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-08	Ordinary Shares	M	75000	$24.63	Acquired	89974.5977	Direct
2012-03-08	Ordinary Shares	M	125000	$25.48	Acquired	214974.5977	Direct
2012-03-08	Ordinary Shares	S	200000	$28.00	Disposed	14974.5977	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-08	NQ Stock Options	$24.63	M	75000	Disposed	2014-09-13	Ordinary Shares (75000)	Direct
2012-03-08	NQ Stock Options	$25.48	M	125000	Disposed	2013-04-27	Ordinary Shares (125000)	Direct

Footnotes

F1: Includes 684 shares purchased at $11.764 per share under the Employee Stock Purchase Plan on January 31, 2012.

F2: Shares were sold under a 10b5-1 trading plan adopted by the Reporting Person on January 13, 2012.

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 September 13, 2008. The remaining shares are vesting and will continue to vest proportionally each month over the 36 months following September 13, 2008.

F4: Options granted the Reporting Person under the Issuer's 2004 Stock Compensation Plan are subject to the following vesting schedule. One half of the option shares vested on April 27, 2010. The remaining shares vested on April 27, 2011.