X0609 4 2026-05-11 0 0000106040 WESTERN DIGITAL CORP WDC 0002057091 Davis Brian Scott false C/O WESTERN DIGITAL CORPORATION 5601 GREAT OAKS PARKWAY SAN JOSE CA 95119 0 1 0 0 Chief Sales & Mrktng Officer 1 Common Stock 2026-05-11 4 S 0 1675 489.7788 D 113889 D Common Stock 2026-05-11 4 S 0 107 490.486 D 113782 D Common Stock 2026-05-11 4 S 0 120 491.1333 D 113662 D Common Stock 2026-05-11 4 S 0 160 493.3338 D 113502 D Common Stock 2026-05-11 4 S 0 120 494.4 D 113382 D Common Stock 2026-05-11 4 S 0 40 495.97 D 113342 D Common Stock 2026-05-11 4 S 0 160 497.1788 D 113182 D Common Stock 2026-05-11 4 S 0 401 499.0243 D 112781 D Common Stock 2026-05-11 4 S 0 996 500.1821 D 111785 D Common Stock 2026-05-11 4 S 0 966 501.4428 D 110819 D Common Stock 2026-05-11 4 S 0 745 502.4897 D 110074 D Common Stock 2026-05-11 4 S 0 876 503.568 D 109198 D Common Stock 2026-05-11 4 S 0 1617 504.1022 D 107581 D Common Stock 2026-05-11 4 S 0 562 505.2479 D 107019 D Common Stock 2026-05-11 4 S 0 386 506.9181 D 106633 D Common Stock 2026-05-11 4 S 0 17 507.68 D 106616 D Common Stock 2026-05-11 4 S 0 751 509.1757 D 105865 D Common Stock 2026-05-11 4 S 0 301 510.0009 D 105564 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 3, 2025. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $488.9450 to a high of $489.9200. 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 $490.0000 to a high of $490.6500. 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 $491.1050 to a high of $491.1900. 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 $492.8600 to a high of $493.8550. 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 $497.0900 to a high of $497.3950. 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 $498.6450 to a high of $499.6300. 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 $499.6500 to a high of $500.6000. 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 $500.7800 to a high of $501.7300. 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 $501.8600 to a high of $502.7000. 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 $503.0000 to a high of $503.9300. 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 $504.0000 to a high of $504.7800. 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 $505.0000 to a high of $505.4200. 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 $506.5000 to a high of $507.3000. 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 $508.6800 to a high of $509.6500. 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 $509.8600 to a high of $510.3800. 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. By: /s/ Sandra Garcia Attorney-in-Fact For: Brian Scott Davis 2026-05-12