SCHEDULE 13G 0001418660 XXXXXXXX LIVE Common Stock 06/30/2025 0000106040 WESTERN DIGITAL CORP 958102105 5601 GREAT OAKS PARKWAY SAN JOSE CA 95119 Rule 13d-1(b) MANAGED ACCOUNT ADVISORS LLC b DE 0.00 0.00 22176462.00 2504.00 22178966.00 6.4 IV WESTERN DIGITAL CORP 5601 GREAT OAKS PARKWAY, SAN JOSE, CALIFORNIA, 95119 MANAGED ACCOUNT ADVISORS LLC 101 HUDSON STREET 9TH FLOOR JERSEY CITY, NJ 07302 Delaware N IA 22,178,966.00 6.4% 0.00 0.00 22,176,462.00 2,504.00 Y N Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. MANAGED ACCOUNT ADVISORS LLC John Capelli 08/13/2025