WESTERN DIGITAL CORP — Director's Dealing 2018

May 31, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTERN DIGITAL CORP (WDC)
CIK: 0000106040
Period of Report: 2018-05-29

Reporting Person: Sivaram Srinivasan (EVP, Memory Technology)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-05-29	Common Stock	M	25362	$44.78	Acquired	110910.498	Direct
2018-05-29	Common Stock	M	6322	$30.2	Acquired	117232.498	Direct
2018-05-29	Common Stock	M	12139	$36.87	Acquired	129371.498	Direct
2018-05-29	Common Stock	M	18968	$40.63	Acquired	148339.498	Direct
2018-05-29	Common Stock	S	2700	$86.7548	Disposed	145639.498	Direct
2018-05-29	Common Stock	S	61179	$86.3415	Disposed	84460.498	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-05-29	Employee Stock Option (right to buy)	$30.2	M	6322	Disposed	2020-06-27	Common Stock (6322)	Direct
2018-05-29	Employee Stock Option (right to buy)	$36.87	M	12139	Disposed	2021-02-17	Common Stock (12139)	Direct
2018-05-29	Employee Stock Option (right to buy)	$40.63	M	18968	Disposed	2022-02-16	Common Stock (18968)	Direct
2018-05-29	Employee Stock Option (right to buy)	$44.78	M	25362	Disposed	2023-08-03	Common Stock (25362)	Direct

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 March 2, 2017, as amended on February 26, 2018.

F2: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $86.695 to a high of $86.90. 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.

F3: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $85.695 to a high of $86.69. 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.

F4: The option vests in substantially equal installments at the end of each three-month period through June 28, 2017. The first installment became exercisable on June 28, 2016.

F5: The option vests in substantially equal installments at the end of each three-month period through February 18, 2018. The first installment became exercisable on May 18, 2016.

F6: The option vests in substantially equal installments at the end of each three-month period through February 17, 2019. The first installment became exercisable on May 17, 2016.

F7: 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.