Item 5. Other Information

Insider Trading Arrangements

During the quarter ended April 3, 2026, the following director and officers (as defined in Rule 16a-1(f) of the Exchange Act) adopted a trading arrangement for the purchase or sale of securities of Western Digital that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) of the Exchange Act (“Rule 10b5-1 Plan”):

• Martin I. Cole, a director of the Company, adopted a Rule 10b5-1 Plan on March 5, 2026. Under this plan, up to an aggregate of 12,000 shares of the Company’s common stock may be sold before the plan expires on October 31, 2026.

• Irving Tan, Chief Executive Officer of the Company, adopted a Rule 10b5-1 Plan on February 5, 2026. Under this plan, up to an aggregate of 80,000 shares of the Company’s common stock may be sold before the plan expires on May 31, 2027.

• Cynthia Tregillis, Executive Vice President, Chief Legal Officer and Secretary of the Company, adopted a Rule 10b5-1 Plan on March 6, 2026. Under this plan, up to an aggregate of 27,765 shares of the Company’s common stock may be sold before the plan expires on December 31, 2027.