Seagate Technology — Director's Dealing 2011

Sep 14, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2011-09-12

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-09-12	Restricted Stock Units	A	11700	—	Acquired	32323	Direct
2011-09-13	Ordinary Shares	S	243	$11.3133	Disposed	32080	Direct
2011-09-14	Ordinary Shares	S	872	$11.7633	Disposed	31208	Direct
2011-09-14	Ordinary Shares	S	100	$11.76	Disposed	31108	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-09-12	NQ Stock Options	$11.155	A	29250	Acquired	2018-09-12	Ordinary Shares (29250)	Direct

Footnotes

F1: Includes 271 shares purchased on July 31, 2011 under the Employee Stock Purchase Plan at $11.8065 per share.

F2: Consists of a grant of restricted stock units awarded to the Reporting Person under the 2004 Stock Compensation Plan for no consideration. Each restricted stock unit represents a contingent right to receive one share of Seagate ordinary shares. Subject to that Person's Continuous Service with the Company, vestedd shares to be released to the Reporting Person on each of the first four anniversaries of the vesting commencement date of September 12, 2011.

F3: Shares sold pursuant to vesting provisions under the restricted stock unit award issued on Septmber 12, 2008. Shares sold to pay tax liabilities resulting from the vesting of 666 Restricted Stock Units on September 12, 2011. The sale was effected to a 10b5-1 trading plan.

F4: Shares sold pursuant to vesting provisions under the restricted stock unit award issued on Septmber 13, 2010. Shares sold to pay tax liabilities resulting from the vesting of 2,750 Restricted Stock Units on September 13, 2011. The sale was effected to a 10b5-1 trading plan.

F5: 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 will vest on September 12, 2012. The remaining option shares vested proportionally each month over the 36 months following September 12, 2012.