Seagate Technology — Director's Dealing 2012

Aug 8, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2012-08-06

Reporting Person: O MALLEY PATRICK J (EVP & Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-06	Ordinary Shares	M	67999	$13.73	Acquired	353586.65	Direct
2012-08-06	Ordinary Shares	S	47650	$31.5337	Disposed	305936.65	Direct
2012-08-07	Ordinary Shares	M	70000	$25.48	Acquired	375936.65	Direct
2012-08-07	Ordinary Shares	S	70000	$32.98	Disposed	305936.65	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-06	NQ Stock Options	$13.73	M	67999	Disposed	2015-09-12	Ordinary Shares (67999)	Direct
2012-08-07	NQ Stock Options	$25.48	M	70000	Disposed	2013-04-27	Ordinary Shares (132156)	Direct

Footnotes

F1: Since the date of the reporting person's last ownership report (07/26/2012), he transferred pursuant to a domestic relations order 1,981 restricted share units to be settled in ordinary shares of Seagate Technology plc ("Issuer"), nominal value $0.00001 ("Ordinary Shares"), which transfer was exempt pursuant to Rule 16a-12. The reporting person no longer reports as beneficially owned any securities transferred pursuant to the domestic relations order.

F2: Includes 563 Ordinary Shares acquired under the Employee Stock Purchase Plan on July 31, 2012.

F3: The price reported in Column 4 is a weighted average price. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F4: Sale was effected pursuant to a Rule 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 vested on September 12, 2009. The remaining option shares are vesting and will continue to vest proportionally each month over the 36 months following September 12, 2009. Since the date of the reporting person's last ownership report (07/26/2012), pursuant to a domestic relations order he transferred: (1) 56,047 options granted under this grant, with an exercise price per share of $13.73 and with a grant date of 09/12/2008 and (2) 218,097 options granted at an exercise price per share of $3.35 and a grant date of 03/06/2009, which transfers were exempt pursuant to Rule 16a-12. The reporting person no longer reports as beneficially owned any securities transferred pursuant to the domestic relations order.

F6: Options granted to the Reporting Person under the Issuer's 2004 Stock Compensation Plan, are subject to a five year vesting schedule. One half of the option shares vested on April 27, 2010. The remaining option shares vested on April 27, 2011. Since the date of the reporting person's last ownership report (07/26/2012), pursuant to a domestic relations order he transferred 344 options granted at an exercise price per share of $25.48 and a grant date of 04/27/2006 and which transfer was exempt pursuant to Rule 16a-12. The reporting person no longer reports as beneficially owned any securities transferred pursuant to the domestic relations order.