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sellWeak cluster of 410b5-1 plan

Cynthia L Tregillis sold $1.1M of WDC

Chief Legal Officer & Corp Sec at WESTERN DIGITAL CORP. 14,067 shares at an average of $74.78, traded Aug 22, 2025, filed Aug 25, 2025.

Warning score
20
Value
$1.1M
14,067 shares
Holdings after
135,351
-9% from before
From 52-week low
+153%
low $30.39, close $76.74
From 52-week high
-2%
high $78.45, as of Aug 22, 2025

Score components

  • Role
    Officer
    +15
  • Trade size
    $1.1M at market
    +25
  • Share of holdings sold
    Sold 9.4% of holdings
    0
  • Cluster
    4 insiders selling within 14 days
    +15
  • Exercise and sell
    Shares came from an option exercise in the same filing
    -15
  • 10b5-1 plan
    Pre-scheduled under a 10b5-1 plan
    -20

What happened after comparable sells

Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.

This signal so far: 1m +38.6%, 3m +90.7%, 6m +254.7%.

Price around the trade, and since

From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.

WDCOct 9, 2026 · close 397.28
Since filing Aug 25, 2025: +403.0%SPY +22.7% · excess +380.3%

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™

Rows in this filing

Every transaction in Form 4 0001266824-25-000155, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
Aug 21, 2025MOption exercise
Common Stock10b5-1
+18$0.00$0153,846Aug 25, 2025
Aug 21, 2025FTax withholding
Common Stock10b5-1
-4,428$74.66$331k149,418Aug 25, 2025
Aug 22, 2025SOpen-market sale
Common Stock10b5-1
-14,067$74.78$1.1M135,351Aug 25, 2025
Aug 21, 2025MOption exercise
Dividend Equivalent Rightsderivative10b5-1
-19$0.00$0186Aug 25, 2025

Related signals

Other insiders at WESTERN DIGITAL CORP and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
38Weak
WDCsell 3
WESTERN DIGITAL CORP
Vidyadhara K Gubbi
Chief of Global Operations
$825k
1,795 shares
-2%
7Weak
WDCsell 310b5-1
WESTERN DIGITAL CORP
Cynthia L Tregillis
Chief Legal Officer & Corp Sec
$195k
432 shares
-0%
60Notable
WDCsell 3
WESTERN DIGITAL CORP
Stephanie A Streeter
director
$2.5M
5,600 shares
-14%
16Weak
WDCsell 310b5-1
WESTERN DIGITAL CORP
Cynthia L Tregillis
Chief Legal Officer & Corp Sec
$696k
1,483 shares
-1%
11Weak
WDCsell 410b5-1
WESTERN DIGITAL CORP
Cynthia L Tregillis
Chief Legal Officer & Corp Sec
$417k
919 shares
-1%
45Moderate
WDCsell 310b5-1
WESTERN DIGITAL CORP
Irving Tan
Chief Executive Officer
$8.9M
20,000 shares
-3%
40Moderate
WDCsell 310b5-1
WESTERN DIGITAL CORP
Martin I Cole
director
$1.7M
3,808 shares
-15%
19Weak
WDCsell 310b5-1
WESTERN DIGITAL CORP
Martin I Cole
director
$89k
192 shares
-1%
5Weak
WDCsell 210b5-1
WESTERN DIGITAL CORP
Cynthia L Tregillis
Chief Legal Officer & Corp Sec
$428k
808 shares
-1%
40Moderate
WDCsell 410b5-1
WESTERN DIGITAL CORP
Martin I Cole
director
$1.7M
3,280 shares
-11%

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

Cynthia L Tregillis sold $1.1M of WDC | InsiderTell