144 0002057093 XXXXXXXX LIVE 0000106040 WESTERN DIGITAL CORPORATION 001-08703 5601 Great Oaks Parkway San Jose CA 95119 (408) 717-6000 VIDYADHARA K GUBBI Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

2475 1376694.00 344682131 06/01/2026 NASDAQ Common 05/20/2026 Restricted Stock Issuer N 604 05/20/2026 Not Applicable Common 05/21/2026 Restricted Stock Issuer N 707 05/21/2026 Not Applicable Common 05/25/2026 Restricted Stock Issuer N 1164 05/25/2026 Not Applicable N VIDYADHARA K GUBBI

5601 Great Oaks Parkway San Jose CA 95119

Common 05/04/2026 4674 2071446.69 VIDYADHARA K GUBBI

5601 Great Oaks Parkway San Jose CA 95119

Common 03/06/2026 8518 2174858.35 VIDYADHARA K GUBBI

5601 Great Oaks Parkway San Jose CA 95119

Common 03/04/2026 10148 2743110.02 06/01/2026 /s/ Vidyadhara Kumaraswamy Gubbi