WESTERN DIGITAL CORP — Director's Dealing 2026

Mar 4, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTERN DIGITAL CORP (WDC)
CIK: 0000106040
Period of Report: 2026-03-02

Reporting Person: Cole Martin I (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-03-02	Common Stock	S	100	$263.66	Disposed	35333	Direct
2026-03-02	Common Stock	S	300	$265.7	Disposed	35033	Direct
2026-03-02	Common Stock	S	300	$267.8067	Disposed	34733	Direct
2026-03-02	Common Stock	S	634	$268.837	Disposed	34099	Direct
2026-03-02	Common Stock	S	966	$269.7213	Disposed	33133	Direct
2026-03-02	Common Stock	S	1400	$271.681	Disposed	31733	Direct
2026-03-02	Common Stock	S	1100	$272.5581	Disposed	30633	Direct
2026-03-02	Common Stock	S	200	$273.565	Disposed	30433	Direct
2026-03-02	Common Stock	S	300	$274.8667	Disposed	30133	Direct
2026-03-02	Common Stock	S	200	$276.525	Disposed	29933	Direct
2026-03-02	Common Stock	S	100	$277.16	Disposed	29833	Direct
2026-03-02	Common Stock	S	107	$278.973	Disposed	29726	Direct
2026-03-02	Common Stock	S	193	$280.725	Disposed	29533	Direct
2026-03-02	Common Stock	S	100	$281.99	Disposed	29433	Direct

Footnotes

F1: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 1, 2025.

F2: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $265.50 to a high of $266.05. 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 $267.34 to a high of $268.31. 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: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $268.36 to a high of $269.35. 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.

F5: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $269.36 to a high of $270.14. 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.

F6: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $271.19 to a high of $272.09. 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.

F7: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $272.20 to a high of $273.14. 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.

F8: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $273.28 to a high of $273.85. 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.

F9: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $274.47 to a high of $275.10. 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.

F10: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $276.06 to a high of $276.99. 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.

F11: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $278.73 to a high of $278.99. 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.

F12: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $280.44 to a high of $280.99. 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.