Seagate Technology — Director's Dealing 2013

May 20, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2013-05-17

Reporting Person: Whitmore Robert W (EVP & Chief Technical Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-17	Ordinary Shares	M	10000	$13.73	Acquired	73364	Direct
2013-05-17	Ordinary Shares	M	10000	$4.045	Acquired	83364	Direct
2013-05-17	Ordinary Shares	M	10000	$11.065	Acquired	93364	Direct
2013-05-17	Ordinary Shares	S	30000	$41.0904	Disposed	63364	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-17	NQ Stock Options	$13.73	M	10000	Disposed	2015-09-12	Ordinary Shares (10000)	Direct
2013-05-17	NQ Stock Options	$4.045	M	10000	Disposed	2016-01-30	Ordinary Shares (10000)	Direct
2013-05-17	NQ Stock Options	$11.065	M	10000	Disposed	2017-09-13	Ordinary Shares (10000)	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at sales prices ranging from $41.05 to $41.13, inclusive. 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.

F2: 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 vested proportionally each month over the 36 months following September 12, 2009.

F3: 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 January 12, 2010. The remaining option shares vested proportionally each month over the 36 months following January 12, 2010.

F4: 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.