SEC Form 4 · accession 0001266824-26-000163

WESTERN DIGITAL CORP · WDC

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Martin I Cole

Director

Period of report

Jul 28, 2026

Accepted (ET)

Jul 29, 2026 · 7:31 pm EDT

Rule 10b5-1 plan

yes — trade under a plan

Issuer CIK

0000106040

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I
Common Stock^F2	Jul 28, 2026	S	64	$424.045	D	25,369	D
Common Stock^F3	Jul 28, 2026	S	32	$425.31	D	25,337	D
Common Stock^F4	Jul 28, 2026	S	64	$426.4453	D	25,273	D
Common Stock^F5	Jul 28, 2026	S	115	$428.0837	D	25,158	D
Common Stock^F6	Jul 28, 2026	S	93	$429.1159	D	25,065	D
Common Stock^F7	Jul 28, 2026	S	103	$430.4469	D	24,962	D
Common Stock^F8	Jul 28, 2026	S	115	$431.407	D	24,847	D
Common Stock^F9	Jul 28, 2026	S	38	$432.2047	D	24,809	D
Common Stock^F10	Jul 28, 2026	S	112	$433.8386	D	24,697	D
Common Stock^F11	Jul 28, 2026	S	64	$434.805	D	24,633	D
Common Stock^F12	Jul 28, 2026	S	32	$435.585	D	24,601	D
Common Stock^F13	Jul 28, 2026	S	154	$436.8934	D	24,447	D
Common Stock^F14	Jul 28, 2026	S	118	$438.0839	D	24,329	D
Common Stock^F15	Jul 28, 2026	S	64	$439.38	D	24,265	D
Common Stock^F16	Jul 28, 2026	S	96	$440.9617	D	24,169	D
Common Stock^F17	Jul 28, 2026	S	32	$442.47	D	24,137	D
Common Stock^F18	Jul 28, 2026	S	32	$444.51	D	24,105	D
Common Stock^F19	Jul 28, 2026	S	32	$447.095	D	24,073	D
Common Stock^F20	Jul 28, 2026	S	41	$448.4559	D	24,032	D
Common Stock^F21	Jul 28, 2026	S	39	$449.4208	D	23,993	D
Common Stock^F22	Jul 28, 2026	S	70	$451.304	D	23,923	D
Common Stock^F23	Jul 28, 2026	S	106	$452.1232	D	23,817	D
Common Stock^F24	Jul 28, 2026	S	144	$453.2733	D	23,673	D
Common Stock^F25	Jul 28, 2026	S	128	$454.4425	D	23,545	D
Common Stock^F26	Jul 28, 2026	S	304	$455.5468	D	23,241	D
Common Stock^F27	Jul 28, 2026	S	312	$456.5162	D	22,929	D
Common Stock^F28	Jul 28, 2026	S	328	$457.4484	D	22,601	D
Common Stock^F29	Jul 28, 2026	S	529	$458.9562	D	22,072	D
Common Stock^F30	Jul 28, 2026	S	248	$459.9732	D	21,824	D
Common Stock^F31	Jul 28, 2026	S	199	$461.2349	D	21,625	D

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2026.
F10Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $433.24 to a high of $434.16. 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.
F11Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $434.41 to a high of $435.36. 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.
F12Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $435.51 to a high of $435.66. 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.
F13Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $436.54 to a high of $437.49. 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.
F14Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $437.71 to a high of $438.68. 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.
F15Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $439.12 to a high of $439.99. 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.
F16Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $440.67 to a high of $441.46. 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.
F17Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $442.06 to a high of $442.88. 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.
F18Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $444.09 to a high of $444.93. 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.
F19Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $446.73 to a high of $447.46. 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.
F2Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $423.42 to a high of $424.39. 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.
F20Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $447.99 to a high of $448.97. 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.
F21Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $448.99 to a high of $449.95. 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.
F22Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $450.60 to a high of $451.56. 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.
F23Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $451.61 to a high of $452.47. 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.
F24Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $452.75 to a high of $453.69. 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.
F25Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $453.92 to a high of $454.91. 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.
F26Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $455.03 to a high of $456.02. 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.
F27Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $456.05 to a high of $457.00. 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.
F28Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $457.23 to a high of $457.87. 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.
F29Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $458.37 to a high of $459.33. 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.
F3Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $425.15 to a high of $425.47. 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.
F30Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $459.74 to a high of $460.53. 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.
F31Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $460.94 to a high of $461.89. 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.
F4Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $426.24 to a high of $426.98. 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.
F5Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $427.48 to a high of $428.41. 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.
F6Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $428.66 to a high of $429.49. 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.
F7Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $429.79 to a high of $430.74. 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.
F8Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $430.84 to a high of $431.80. 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.
F9Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $432.06 to a high of $432.34. 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.