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sellWeak cluster of 410b5-1 plan

Shelly Brown sold $1.0M of MIAX

EVP, Chief Strategy Officer at MIAMI INTERNATIONAL HOLDINGS, INC.. 25,932 shares at an average of $39.33, traded Mar 23, 2026, filed Mar 24, 2026.

Warning score
35
Value
$1.0M
25,932 shares
Holdings after
299,197
-8% from before
From 52-week low
+27%
low $30.74, close $39.08
From 52-week high
-23%
high $50.96, as of Mar 23, 2026

Score components

  • Role
    Officer
    +15
  • Trade size
    $1.0M at market
    +25
  • Share of holdings sold
    Sold 8.0% of holdings
    0
  • Cluster
    4 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.

MIAXOct 9, 2026 · close 30.71
Since filing Mar 24, 2026: -22.2%SPY +19.8% · excess -42.0%

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 0001628280-26-020862, as filed. Open on EDGAR

DateTransactionSharesPriceValueHoldings afterFiled
Mar 23, 2026SOpen-market sale
Common Stock10b5-1
-25,932$39.33$1.0M299,197Mar 24, 2026

Related signals

Other insiders at MIAMI INTERNATIONAL HOLDINGS, INC. and this insider’s other filings.

ScoreCompanyInsiderValueHoldingsFiled
5Weak
MIAXsell10b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Douglas M. Schafer JR
EVP and CIO
$1.3M
40,000 shares
-9%
32Weak
MIAXsell 610b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Shelly Brown
EVP, Chief Strategy Officer
$819k
21,217 shares
-6%
20Weak
MIAXsell 610b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Barbara J. Comly
EVP, GC & Corporate Secretary
$1.8M
44,445 shares
-5%
12Weak
MIAXsell 610b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Edward Deitzel
EVP, CRO, CCO MIAX Exchanges
$464k
11,000 shares
-8%
30Weak
MIAXsell 610b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Thomas P. Gallagher
Chairman & CEO
$2.0M
47,000 shares
-3%
25Weak
MIAXsell 610b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Judson Gray Teekell
director
$353k
8,545 shares
-10%
25Weak
MIAXsell 610b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Douglas M. Schafer JR
EVP and CIO
$1.9M
48,000 shares
-11%
10Weak
MIAXsell 410b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Judson Gray Teekell
director
$12k
300 shares
-0%
25Weak
MIAXsell 410b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Kurt M. Eckert
director
$1.5M
37,917 shares
-21%
25Weak
MIAXsell 410b5-1
MIAMI INTERNATIONAL HOLDINGS, INC.
Douglas M. Schafer JR
EVP and CIO
$1.9M
48,000 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.

Shelly Brown sold $1.0M of MIAX | InsiderTell