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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
106040	Western Digital Corp	WDC	Computer Storage Devices (3572)	330956711

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1232826	E Matthew Massengill	C/O Western Digital Corporation 3355 Michelson Drive, Suite 100 Irvine CA 92612		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2015-02-12	2,126	$32.99	11,151	No	4	M	Direct
Common Stock	Acquisiton	2015-02-12	3,607	$25.79	14,758	No	4	M	Direct
Common Stock	Disposition	2015-02-12	5,733	$107.21	9,025	No	4	S	Direct
Common Stock	Disposition	2015-02-12	3,507	$107.36	500	No	4	S	Indirect	by IRA

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct
No	4	S	Indirect	by IRA

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2015-02-12	3,607	$0.00	3,607	$25.79
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2015-02-12	2,126	$0.00	2,126	$32.99

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
2,164	2012-11-10	2018-11-10	No	4	M	Direct
0	2011-11-11	2017-11-11	No	4	M	Direct

Footnotes

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $107.21 to a high of $107.2501. 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.
Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $107.354 to a high of $107.374. 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.
The option vested 25% one year from the grant date of 11/10/2011, and an additional 6.25% vested at the end of the three-month period on 2/10/2015. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 11/10/2015.
The option vested 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter.