Seagate Technology — Director's Dealing 2013

May 17, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Seagate Technology plc (STX)
CIK: 0001137789
Period of Report: 2013-05-16

Reporting Person: MARSHALL LYDIA MICHEAUX (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-16	Ordinary Shares	M	10000	$26.465	Acquired	56181	Direct
2013-05-16	Ordinary Shares	S	19500	$40.7489	Disposed	36681	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-16	NQ Stock Option	$26.465	M	10000	Disposed	2014-10-25	Ordinary Shares (10000)	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. Shares were sold in multiple transactions at sales prices ranging from $40.68 to $40.8523, inclusive. The Reporting Person undertakes to provide 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 were subject to a four-year vesting schedule. One quarter of the shares vested on October 15, 2008. The remaining three quarters vested proportionally monthly over the 36 months following October 15, 2008.