Tregillis Cynthia L, Chief Legal Officer and Corporate Secretary at Western Digital (WDC), has filed 77 Form 4 transactions with the SEC, all in a single company. The pattern is one-sided: zero open-market purchases and roughly $8.85 million in total sell value. The recent activity, spanning August through October 2026, shows six open-market sales (code S) ranging from $112,158 on August 21 to $481,708 on August 27, with a $306,660 sale on October 21.
The selling is paired with a steady stream of option exercises (code M, valued at $0) and shares withheld for tax obligations (code F). On October 20, Tregillis exercised options and had $477,154 in shares withheld, followed by a sale the next day. Similar clusters appear in late August and early September: exercises on August 25 and 26 led to tax withholdings of $347,528 and $764,743, respectively, plus open-market sales of $214,571 and $305,180. A September 3 exercise triggered a $309,099 tax withholding and a $194,918 sale on September 4.
The compensation component is visible in two grants (code A) with no dollar value, dated August 25 and September 17. No purchases appear anywhere in the filing history. The direction is consistent: Tregillis sells WDC shares after each vesting or exercise event, with the dollar amounts tied to the size of the option tranches. The most recent transaction, a $306,660 sale on October 21, continues that pattern.
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