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sellWeak cluster of 210b5-1 plan

Michael Jon Brown sold $40k of DXCM

EVP, Chief Legal Officer at DEXCOM INC. 500 shares at an average of $80.29, traded Aug 15, 2025, filed Aug 18, 2025.

Warning score
9
Value
$40k
500 shares
Holdings after
94,102
-1% from before
From 52-week low
+35%
low $59.83, close $80.95
From 52-week high
-11%
high $90.75, as of Aug 15, 2025

Score components

  • Role
    Officer
    +15
  • Trade size
    $40k at market
    +6
  • Share of holdings sold
    Sold 0.5% of holdings
    0
  • Cluster
    2 insiders selling within 14 days
    +8
  • 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.

DXCMOct 9, 2026 · close 84.11
Since filing Aug 18, 2025: +4.1%SPY +22.7% · excess -18.6%

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 0001093557-25-000247, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
Aug 15, 2025SOpen-market sale
Common Stock10b5-1
-500$80.29$40k94,102Aug 18, 2025

Related signals

Other insiders at DEXCOM INC and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
22Weak
DXCMsell 310b5-1
DEXCOM INC
Sadie Stern
EVP Chief People & Culture Off
$221k
2,565 shares
-2%
36Weak
DXCMsell 410b5-1
DEXCOM INC
Nicholas Augustinos
director
$680k
8,089 shares
-22%
21Weak
DXCMsell 410b5-1
DEXCOM INC
Michael Jon Brown
EVP Chief Legal Compliance Off
$143k
1,700 shares
-2%
31Weak
DXCMsell 310b5-1
DEXCOM INC
Jereme M Sylvain
EVP, Chief Financal Officer
$303k
3,638 shares
-2%
5Weak
DXCMsell10b5-1
DEXCOM INC
Michael Jon Brown
EVP, Chief Legal Officer
$110k
1,700 shares
-1%
3Weak
DXCMsell10b5-1
DEXCOM INC
Bridgette P Heller
director
$69k
1,012 shares
-4%
14Weak
DXCMsell 210b5-1
DEXCOM INC
Richard Alexander Collins
director
$172k
2,906 shares
-8%
10Weak
DXCMsell 210b5-1
DEXCOM INC
Bridgette P Heller
director
$59k
1,012 shares
-4%
15Weak
DXCMsell 210b5-1
DEXCOM INC
Richard Alexander Collins
director
$218k
3,948 shares
-9%
66Notable
DXCMbuy
DEXCOM INC
Jacob Steven Leach
President & COO
$1.0M
18,200 shares
+6%

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.

Michael Jon Brown sold $40k of DXCM | InsiderTell