144 0002057091 XXXXXXXX LIVE 0000106040 WESTERN DIGITAL CORPORATION 001-08703 5601 Great Oaks Parkway San Jose CA 95119 (408) 717-6000 BRIAN SCOTT DAVIS Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

10000 5006895.00 344682131 05/11/2026 NASDAQ Common 02/27/2024 Performance and Restricted Stock ISSUER N 10000 02/27/2024 Not Applicable N BRIAN SCOTT DAVIS

5601 Great Oaks Parkway San Jose CA 95119

Common 02/17/2026 10000 2791603.01 The securities to be sold were acquired upon the vesting of Restricted Stock and Performance Shares during the period of 02/27/2024 through 03/20/2025. 05/11/2026 11/03/2025 /s/ Brian Scott Davis