13F Pro

SEC Form 4 reporting owner

Tregillis Cynthia L

Tregillis Cynthia L has filed 75 Form 4 transactions reported between November 25, 2025 and September 17, 2026, as Chief Legal Officer & Corp Sec of WESTERN DIGITAL CORP.

Name as filed: Tregillis Cynthia L

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
$7.5M
19 lines
Companies
1
with Form 4 filings
Latest transaction
Sep 17, 2026
transaction date

Roles and reported holdings

  • WDCWESTERN DIGITAL CORP
    Nov 25, 2025 – Sep 17, 2026

    Chief Legal Officer & Corp Sec

    Held directly111,030 sh as of Sep 4, 2026 · Form 4

    24 months: $7.5M sold

Transaction history

All 75 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Sep 17, 2026WDCChief Legal Officer & Corp SecGrant or awardCode A · direct27—Form 4
Sep 4, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct432$195K@ $451.20Form 4
Sep 3, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct7—Form 4
Sep 3, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct700$309K@ $441.57Form 4
Sep 3, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct7—Form 4
Aug 27, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct1,007$482K@ $478.36Form 4
Aug 26, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct9—Form 4
Aug 26, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct1,631$765K@ $468.88Form 4
Aug 26, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct9—Form 4
Aug 26, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct476$215K@ $450.78Form 4
Aug 25, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct8—Form 4
Aug 25, 2026WDCChief Legal Officer & Corp SecGrant or awardCode A · direct3,878—Form 4
Aug 25, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct771$348K@ $450.75Form 4
Aug 25, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct7—Form 4
Aug 24, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct684$305K@ $446.17Form 4
Aug 21, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct11—Form 4
Aug 21, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct1,109$510K@ $459.44Form 4
Aug 21, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct11—Form 4
Aug 21, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct235$112K@ $477.27Form 4
Aug 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct4—Form 4
Aug 20, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct379$178K@ $469.05Form 4
Aug 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct3—Form 4
Jul 21, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct808$428K@ $529.63Form 4
Jul 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct13—Form 4
Jul 20, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct1,309$638K@ $487.42Form 4
Jul 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct13—Form 4
Jun 17, 2026WDCChief Legal Officer & Corp SecGrant or awardCode A · direct19—Form 4
Jun 5, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct432$236K@ $545.60Form 4
Jun 3, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct7—Form 4
Jun 3, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct699$415K@ $594.11Form 4
Jun 3, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct6—Form 4
May 27, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct214$115K@ $539.63Form 4
May 25, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct7—Form 4
May 25, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct771$373K@ $484.28Form 4
May 25, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct7—Form 4
May 22, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct308$150K@ $488.61Form 4
May 21, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct11—Form 4
May 21, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct106$49K@ $458.87Form 4
May 21, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct1,108$539K@ $486.46Form 4
May 21, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct10—Form 4
May 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct4—Form 4
May 20, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct379$174K@ $459.62Form 4
May 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct3—Form 4
Apr 21, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct363$137K@ $377.09Form 4
Apr 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct12—Form 4
Apr 20, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct1,308$489K@ $374.11Form 4
Apr 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct12—Form 4
Mar 18, 2026WDCChief Legal Officer & Corp SecGrant or awardCode A · direct41—Form 4
Mar 4, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct8,547$2.3M@ $269.22Form 4
Mar 4, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct777$200K@ $257.91Form 4
Mar 3, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct24—Form 4
Mar 3, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct2,798$701K@ $250.61Form 4
Mar 3, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct23—Form 4
Feb 26, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct214$61K@ $286.11Form 4
Feb 25, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct7—Form 4
Feb 25, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct770$224K@ $290.95Form 4
Feb 25, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct6—Form 4
Feb 24, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct308$87K@ $281.70Form 4
Feb 23, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct130$37K@ $283.83Form 4
Feb 21, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct9—Form 4
Feb 21, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct1,109$317K@ $285.52Form 4
Feb 21, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct9—Form 4
Feb 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct3—Form 4
Feb 20, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct244$70K@ $285.52Form 4
Feb 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct3—Form 4
Feb 6, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct6,780$1.8M@ $270.49Form 4
Jan 21, 2026WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct447$102K@ $229.00Form 4
Jan 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct11—Form 4
Jan 20, 2026WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct842$188K@ $222.97Form 4
Jan 20, 2026WDCChief Legal Officer & Corp SecOption exerciseCode M · direct11—Form 4
Dec 18, 2025WDCChief Legal Officer & Corp SecGrant or awardCode A · direct82—Form 4
Dec 2, 2025WDCChief Legal Officer & Corp SecOpen-market saleCode S · direct2,801$450K@ $160.57Form 4
Nov 25, 2025WDCChief Legal Officer & Corp SecOption exerciseCode M · direct5—Form 4
Nov 25, 2025WDCChief Legal Officer & Corp SecShares withheld for tax or exercise priceCode F · direct770$120K@ $155.41Form 4
Nov 25, 2025WDCChief Legal Officer & Corp SecOption exerciseCode M · direct5—Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.