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sellModerate cluster of 310b5-1 plan

Irving Tan sold $8.9M of WDC

Chief Executive Officer at WESTERN DIGITAL CORP. 20,000 shares at an average of $444.97, traded Aug 11, 2026, filed Aug 12, 2026.

Warning score
45
Value
$8.9M
20,000 shares
Holdings after
575,966
-3% from before
From 52-week low
+488%
low $74.41, close $437.79
From 52-week high
-41%
high $745.99, as of Aug 11, 2026

Score components

  • Role
    CEO
    +25
  • Trade size
    $8.9M at market
    +25
  • Share of holdings sold
    Sold 3.4% of holdings
    0
  • Cluster
    3 insiders selling within 14 days
    +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.

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 13, 2026 · close 380.71
Since filing Aug 12, 2026: -16.1%SPY +1.0% · excess -17.1%

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 0001266824-26-000166, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
Aug 11, 2026SOpen-market sale
Common Stock10b5-1
-2,478$441.48$1.1M593,488Aug 12, 2026
Aug 11, 2026SOpen-market sale
Common Stock10b5-1
-989$442.22$437k592,499Aug 12, 2026
Aug 11, 2026SOpen-market sale
Common Stock10b5-1
-1,840$443.35$816k590,659Aug 12, 2026
Aug 11, 2026SOpen-market sale
Common Stock10b5-1
-1,880$444.67$836k588,779Aug 12, 2026
Aug 11, 2026SOpen-market sale
Common Stock10b5-1
-4,822$445.45$2.1M583,957Aug 12, 2026
Aug 11, 2026SOpen-market sale
Common Stock10b5-1
-6,445$446.38$2.9M577,512Aug 12, 2026
Aug 11, 2026SOpen-market sale
Common Stock10b5-1
-1,546$447.18$691k575,966Aug 12, 2026

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%
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%
26Weak
WDCsell 410b5-1
WESTERN DIGITAL CORP
Martin I Cole
director
$386k
720 shares
-3%

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.