WESTERN DIGITAL CORP 4

Cynthia L. Tregillis, Chief Legal Officer & Corporate Secretary of Western Digital Corp. (WDC), had small option/derivative-related share acquisitions and tax withholdings, plus open‑market sales totaling 919 shares of common stock under a Rule 10b5‑1 plan, while also receiving a few shares from dividend equivalent rights conversions.

On this Form 4, Cynthia L. Tregillis, Chief Legal Officer & Corporate Secretary of Western Digital Corp., reported several routine equity-compensation-related transactions and small open-market sales. On August 20, 2026, 3 shares of common stock were acquired via an option/derivative-related transaction at a deemed price of $0, followed by 379 shares withheld to satisfy tax obligations upon vesting at approximately $469.05 per share, leaving 114,163 shares. On August 21, 2026, she sold 235 shares at about $477.27 per share under a pre-arranged Rule 10b5‑1 trading plan, acquired 11 additional shares via a $0-cost derivative transaction, and had 1,109 shares withheld for taxes at roughly $459.44 per share, ending the day with 112,830 shares. On August 24, 2026, she sold an additional 684 shares at about $446.17 per share under the same 10b5‑1 plan, bringing her direct holdings to 112,146 shares. Separately, dividend equivalent rights vesting on August 20 and 21 were converted into 3.8337 and 11.1826 shares of common stock, respectively, on a one-for-one basis (with associated modest cash settlement for fractional amounts), representing a small incremental increase in common stock received as part of her RSU-related compensation.

Filing Facts

CIK

106040

Ticker

WDC

Form

4

Source Type

sec

Accession

0001266824-26-000174

Alert Tier

7