WESTERN DIGITAL CORP — Director's Dealing 2018

May 17, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTERN DIGITAL CORP (WDC)
CIK: 0000106040
Period of Report: 2018-05-14

Reporting Person: MILLIGAN STEPHEN D (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-05-14	Common Stock	M	16510	$44.78	Acquired	84624	Direct
2018-05-14	Common Stock	S	16510	$80.94	Disposed	68114	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-05-14	Employee Stock Option (right to buy)	$44.78	M	16510	Disposed	2023-08-03	Common Stock (16510)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	69311	Indirect

Footnotes

F1: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017.

F2: The option vested 25% one year from the grant date of 8/3/2016, and an additional 6.25% vested at the end of each three-month period through 5/3/2018. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 8/3/2020.