Western Digital Officer Cynthia Lock Tregillis Files Form 144 to Sell $194.9K in Common Stock

Form 144 Filing Summary: Western Digital Corp ($WDC)

Transaction Overview

• Filer: Cynthia Lock Tregillis, Officer
• Securities to be Sold: 432 shares of Common Stock
• Aggregate Market Value: $194,918.40 (approx. $451.20 per share)
• Approximate Sale Date: September 4, 2026
• Broker: Morgan Stanley Smith Barney LLC Executive Financial Services

Origin of Securities

• Nature of Acquisition: Restricted Stock vesting from issuer on September 3, 2026 (432 shares).
• Rule 10b5-1 Plan: The proposed sale is executed pursuant to a pre-arranged trading plan adopted on March 6, 2026.

Recent 3-Month Trading Activity

• August 27, 2026: Sold 1,007 shares for gross proceeds of $481,708.52
• August 26, 2026: Sold 476 shares for gross proceeds of $214,571.28
• August 24, 2026: Sold 684 shares for gross proceeds of $305,180.28
• August 21, 2026: Sold 235 shares for gross proceeds of $112,158.45
• July 21, 2026: Sold 808 shares for gross proceeds of $427,941.04
• June 5, 2026: Sold 432 shares for gross proceeds of $235,699.20

Assessment

The proposed sale is relatively small in volume (432 shares against ~360.5M shares outstanding) and is executed under a pre-established Rule 10b5-1 trading plan following the vesting of restricted stock. This indicates routine liquidity/tax-related activity rather than a discretionary signal on company performance.