WESTERN DIGITAL CORP — Director's Dealing 2025

Nov 7, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTERN DIGITAL CORP (WDC)
CIK: 0000106040
Period of Report: 2025-11-05

Reporting Person: Cole Martin I (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-05	Common Stock	S	144	$152.99	Disposed	49360	Direct
2025-11-05	Common Stock	S	221	$155.7686	Disposed	49139	Direct
2025-11-05	Common Stock	S	419	$157.0068	Disposed	48720	Direct
2025-11-05	Common Stock	S	833	$158.0222	Disposed	47887	Direct
2025-11-05	Common Stock	S	551	$159.1577	Disposed	47336	Direct
2025-11-05	Common Stock	S	982	$160.2441	Disposed	46354	Direct
2025-11-05	Common Stock	S	960	$161.3131	Disposed	45394	Direct
2025-11-05	Common Stock	S	3303	$162.1765	Disposed	42091	Direct
2025-11-05	Common Stock	S	1231	$163.0804	Disposed	40860	Direct
2025-11-05	Common Stock	S	798	$164.081	Disposed	40062	Direct
2025-11-05	Common Stock	S	558	$164.9907	Disposed	39504	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: Includes 1,701 additional stock units acquired by the Reporting Person in connection with the Issuer's spin-off (the "Spin-Off") of a then-wholly owned subsidiary of the Issuer on February 21, 2025. Pursuant to an Employee Matters Agreement, at the effective time of the Spin-Off, each outstanding Issuer stock unit was adjusted and converted into additional stock units based on the equity conversion ratio of 1.452526 per every Issuer stock unit.

F3: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $155.5927 to a high of $156.51. 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 $156.59 to a high of $157.58. 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 $157.59 to a high of $158.55. 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 $158.60 to a high of $159.54. 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 $159.69 to a high of $160.6804. 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 $160.70 to a high of $161.69. 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.

F9: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $161.70 to a high of $162.69. 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.

F10: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $162.70 to a high of $163.68. 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 $163.70 to a high of $164.68. 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 $164.71 to a high of $165.35. 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.