WDCWestern Digital

On September 1, 2026, Tunç Doluca, a director of the Company, adopted a Rule 10b5-1 Plan. Under this plan, up to an aggregate of 13,440 shares of the Company’s common stock may be sold before the plan expires on December 31, 2027.

On August 14, 2026, Irving Tan, Chief Executive Officer of the Company, modified his previously reported Rule 10b5-1 Plan adopted on February 5, 2026. Mr. Tan’s plan was modified to amend the equity awards subject to the plan, with no change to the expiration date of the plan (May 31, 2027) or the total number of shares subject to the plan (up to an aggregate of 80,000 shares of the Company’s common stock, of which, 20,000 shares had already been sold prior to the plan amendment). Trades under the modified plan are subject to a cooling off period consistent with SEC requirements.

On August 7, 2026, Brian Scott Davis, Executive Vice President and Chief Sales and Marketing Officer of the Company, terminated his previously reported Rule 10b5-1 Plans adopted on November 3, 2025 and June 5, 2026. The November 3, 2025 plan was scheduled to expire on August 14, 2026, and the June 5, 2026 plan was scheduled to commence on November 9, 2026.

Brian Scott Davis, Executive Vice President and Chief Sales and Marketing Officer of the Company, adopted a Rule 10b5-1 Plan on June 5, 2026. Under this plan, up to an aggregate of 31,016 shares of the Company’s common stock may be sold before the plan expires on February 16, 2027.

Kimberly Alexy, a director of the Company, adopted a Rule 10b5-1 Plan on May 29, 2026. Under this plan, up to an aggregate of 10,000 shares of the Company’s common stock may be sold before the plan expires on December 1, 2027.

Ahmed Shihab, Executive Vice President and Chief Product Officer of the Company, adopted a Rule 10b5-1 Plan on May 28, 2026. Under this plan, up to an aggregate of 24,000 shares of the Company’s common stock may be sold before the plan expires on June 1, 2028.

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.

• 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.

Matthew E. Massengill, a director of the Company, adopted a Rule 10b5-1 Plan on November 6, 2025. Under this plan, up to an aggregate of 36,926 shares of the Company’s common stock may be sold before the plan expires on May 15, 2026.

Brian Scott Davis, Executive Vice President and Chief Sales and Marketing Officer of the Company, adopted a Rule 10b5-1 Plan on November 3, 2025. Under this plan, up to an aggregate of 30,000 shares of the Company’s common stock may be sold before the plan expires on August 14, 2026.

Martin I. Cole, a director of the Company, adopted a Rule 10b5-1 Plan on August 1, 2025. Under this plan, up to an aggregate of 22,000 shares of the Company’s common stock may be sold before the plan expires on October 30, 2026.

Cynthia Tregillis, Executive Vice President, Chief Legal Officer and Secretary of the Company, adopted a Rule 10b5-1 Plan on May 23, 2025. Under this plan, up to an aggregate of 17,502 shares of the Company’s common stock may be sold before the plan expires on May 26, 2026.

Irving Tan, Chief Executive Officer of the Company adopted a Rule 10b5-1 Plan on May 12, 2025. 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 26, 2026.

Gene Zamiska, Senior Vice President, Global Accounting and Chief Accounting Officer of the Company, adopted a Rule 10b5-1 Plan on March 6, 2025. Under this plan, up to an aggregate of 29,653 shares of the Company’s common stock may be sold before the plan expires on September 4, 2026.

David Goeckeler, Chief Executive Officer of the Company adopted a Rule 10b5-1 Plan on June 6, 2024. Under this plan, beginning on September 5, 2024, up to an aggregate of 300,000 shares of the Company’s common stock may be sold before the plan expires on December 31, 2024.

Matthew E. Massengill, a director of the Company, adopted a Rule 10b5-1 Plan on May 30, 2024. Under this plan, beginning on August 29, 2024, up to an aggregate of 23,593 shares of the Company’s common stock may be sold before the plan expires on December 6, 2024.

Kimberly E. Alexy, a director of the Company, adopted a Rule 10b5-1 Plan on May 24, 2024. Under this plan, beginning on August 23, 2024, up to an aggregate of 4,963 shares of the Company’s common stock may be sold before the plan expires on February 24, 2025.

Michael Ray, a former Executive Vice President, Chief Legal Officer and Secretary of the Company who left the Company effective January 12, 2024, terminated a Rule 10b5-1 Plan on February 23, 2024.

Gene Zamiska, Senior Vice President, Global Accounting and Chief Accounting Officer of the Company, adopted a Rule 10b5-1 Plan on December 1, 2023. Under this plan, up to an aggregate of 26,432 shares of the Company’s common stock may be sold before the plan expires on May 1, 2025.

Kimberly E. Alexy, a director of the Company, adopted a Rule 10b5-1 Plan on November 24, 2023. Under this plan, up to an aggregate of 5,648 shares of the Company’s common stock may be sold before the plan expires on November 24, 2025.

Michael Ray, Executive Vice President, Chief Legal Officer and Secretary of the Company, adopted a Rule 10b5-1 Plan on November 8, 2023. Under this plan, up to an aggregate of 87,902 shares of the Company’s common stock may be sold before the plan expires on May 9, 2025.