Cynthia L Tregillis

Cynthia L Tregillis

General Counsel · WESTERN DIGITAL CORP

Rank #1,817 SEC EDGAR (United States) ↗ Files from United States

Details

Officer of the companyComputer Hardware & NetworkingWDCSEC CIK 0002057088

Computed from SEC EDGAR filings and closing prices — not copied from any wealth ranking. Dataset . How we calculate this.

Disclosed holdings
$56.9M
1-day change
▲ 5.86%
Positions on file
1
issuers disclosed in Forms 3/4/5 and Schedules 13D/G

Disclosed holdings over time 53 weekly points

What the 1 currently disclosed position would have been worth at each week’s closing price. A rising line means the shares got more valuable, not that this person bought more.

How the line is built

Share counts are as last reported to the SEC and held constant; only prices move.

2025-09-05$11.2M – $90.8M2026-09-04

Insider activity Mar 3, 2025 – Mar 4, 2026

Cynthia L Tregillis is recorded in filings to the U.S. SEC via EDGAR as officer of the company, and reported 46 transactions between Mar 3, 2025 and Mar 4, 2026. The buy and sell totals below count only codes P, S.

Why the other codes are excluded

Share awards (A), shares withheld to pay tax (F), option exercises (M) and gifts (G) also appear in the table, but they are consequences of a pay package or a private transfer, not a decision to buy or sell on the open market. Counting them would turn this into a compensation ranking.

Open-market buys (code P)
None
0 purchases on file
Open-market sales (code S)
$6.12M
9 sales on file priced rows only
All reported transactions
46
every code, including awards and exercises
Pattern
Net seller in the final 12 months of the window
last 12 months of the window

Events from filings

Detected automatically in the filings linked below. Each headline is built from the numbers in those filings, not written by a model. Newest first; events older than 45 days stay listed and are marked as older.

Cynthia L Tregillis sold 8,547 WESTERN DIGITAL CORP (WDC) shares for $2,301,023 on Mar 4, 2026

Large trade for this person

Flagged because this trade was large compared with this person’s own earlier open-market trades in the same currency — not because it is large in absolute terms. A trade that is routine for one insider can be flagged for another.

Cynthia L Tregillis sold 8,547 WESTERN DIGITAL CORP (WDC) shares for $2,301,023 on Mar 4, 2026
Date Insider Transaction Shares Price Value Filing
Mar 4, 2026 Cynthia L Tregillis S Open-market sale 8,547 held after: 121,682 $269.22 $2,301,023 SEC filing ↗

Source: SEC EDGAR (United States); every row links to where it was published. Event computed Sep 14, 2026.

Reported transactions

Price 0.00 is a real reported figure on gifts (G) and share awards (A) — not a missing number. The 25 most recent rows are grouped into 25 lines by date, company and transaction type — open a line to see every lot with its own source link. We hold 80 on file in total. See the full history on EDGAR ↗

How to read this list

Every row is one line of one Form 4 or Form 5, with the filing it came from. Where the record carries no price at all we leave the cell empty instead of guessing one.

The shares and money on a grouped line add up only the lots listed inside that line, and only when every one of them carries the figure. Where a group mixes more than one reporting currency we leave the money blank rather than convert — no source publishes the rate that conversion would need.

  1. WESTERN DIGITAL CORP WDC S Open-market sale 432 shares $194.9K at $451.20 SEC filing ↗
  2. WESTERN DIGITAL CORP WDC F Shares withheld for taxesnot a buy/sell decision 700 shares $309.1K at $441.57 SEC filing ↗
  3. WESTERN DIGITAL CORP WDC M Option exercise or conversionnot a buy/sell decisionreported at zero 7 shares $0 at $0.00 SEC filing ↗
  4. WESTERN DIGITAL CORP WDC S Open-market sale 1,007 shares $481.7K at $478.36 SEC filing ↗
  5. WESTERN DIGITAL CORP WDC F Shares withheld for taxesnot a buy/sell decision 1,631 shares $764.7K at $468.88 SEC filing ↗
  6. WESTERN DIGITAL CORP WDC M Option exercise or conversionnot a buy/sell decisionreported at zero 9 shares $0 at $0.00 SEC filing ↗
  7. WESTERN DIGITAL CORP WDC S Open-market sale 476 shares $214.6K at $450.78 SEC filing ↗
  8. WESTERN DIGITAL CORP WDC A Grant or awardnot a buy/sell decisionreported at zero 3,878 shares $0 at $0.00 SEC filing ↗
  9. WESTERN DIGITAL CORP WDC F Shares withheld for taxesnot a buy/sell decision 771 shares $347.5K at $450.75 SEC filing ↗
  10. WESTERN DIGITAL CORP WDC M Option exercise or conversionnot a buy/sell decisionreported at zero 7 shares $0 at $0.00 SEC filing ↗
  11. WESTERN DIGITAL CORP WDC S Open-market sale 684 shares $305.2K at $446.17 SEC filing ↗
  12. WESTERN DIGITAL CORP WDC F Shares withheld for taxesnot a buy/sell decision 1,109 shares $509.5K at $459.44 SEC filing ↗
  13. WESTERN DIGITAL CORP WDC M Option exercise or conversionnot a buy/sell decisionreported at zero 11 shares $0 at $0.00 SEC filing ↗
  14. WESTERN DIGITAL CORP WDC S Open-market sale 235 shares $112.2K at $477.27 SEC filing ↗
  15. WESTERN DIGITAL CORP WDC F Shares withheld for taxesnot a buy/sell decision 379 shares $177.8K at $469.05 SEC filing ↗
  16. WESTERN DIGITAL CORP WDC M Option exercise or conversionnot a buy/sell decisionreported at zero 3 shares $0 at $0.00 SEC filing ↗
  17. WESTERN DIGITAL CORP WDC S Open-market sale 808 shares $427.9K at $529.63 SEC filing ↗
  18. WESTERN DIGITAL CORP WDC F Shares withheld for taxesnot a buy/sell decision 1,309 shares $638.0K at $487.42 SEC filing ↗
  19. WESTERN DIGITAL CORP WDC M Option exercise or conversionnot a buy/sell decisionreported at zero 13 shares $0 at $0.00 SEC filing ↗
  20. WESTERN DIGITAL CORP WDC S Open-market sale 432 shares $235.7K at $545.60 SEC filing ↗
  21. WESTERN DIGITAL CORP WDC F Shares withheld for taxesnot a buy/sell decision 699 shares $415.3K at $594.11 SEC filing ↗
  22. WESTERN DIGITAL CORP WDC M Option exercise or conversionnot a buy/sell decisionreported at zero 6 shares $0 at $0.00 SEC filing ↗
  23. WESTERN DIGITAL CORP WDC S Open-market sale 214 shares $115.5K at $539.63 SEC filing ↗
  24. WESTERN DIGITAL CORP WDC F Shares withheld for taxesnot a buy/sell decision 771 shares $373.4K at $484.28 SEC filing ↗
  25. WESTERN DIGITAL CORP WDC M Option exercise or conversionnot a buy/sell decisionreported at zero 7 shares $0 at $0.00 SEC filing ↗

Disclosed holdings

Shares is the amount on the form; value is that amount times the closing price shown. Rows with no closing price are left blank, so they may add up to less than the headline figure.

What is not counted here

Each row is one filing you can open. Private companies, real estate, bonds and crypto are not in SEC insider filings and are therefore not counted here.

Equity positions disclosed to the SEC, with the source filing behind each row.
Issuer Ticker Security Shares Close Value Form Reported Filing
WESTERN DIGITAL CORP WDC Common Stock 121,682 $467.46 $56.9M 4 EDGAR ↗

Other insiders at the same companies

People who also file with the SEC at a company where Cynthia L Tregillis reports shares.

Sharing a filing does not mean they work together day to day — it means both names appear on the same issuer’s insider record.

Sources

The filings linked in the tables above are the sources for every figure on this page.

Portrait photograph: WESTERN DIGITAL CORP (company-published photograph). Original file page on westerndigital.com ↗

Think a number here is wrong? Open the linked filing and compare — how to report it.

Profile record last refreshed Sep 8, 2026.