MIAMI INTERNATIONAL HOLDINGS (MIAX) stock: insider trades, news & valuation
Net selling
Close · Oct 9, 2026
$30.71
+0.0% on the day
-28.5% over 12 months
52-week range $30.18 – $56.84
Share price and insider trades
MIAX closeInsider buyInsider sale
Bought, 12 months$1.0M
Sold, 12 months$81.6M
Insiders buying2
Insiders selling12
MIAMI INTERNATIONAL HOLDINGS insider trading at a glance (Oct 9, 2026): in the past 12 months, 2 insiders bought $1.0M and 12 sold $81.6M of MIAX stock on the open market.
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MIAX insider buying and selling by quarter
Open-market purchases (green, above the line) and sales (red, below), by trade date.
| Quarter | Bought | Purchases | Sold | Sales |
|---|---|---|---|---|
| Q4 2026 | — | 0 | $1.3M | 1 |
| Q3 2026 | — | 0 | $36.0M | 29 |
| Q2 2026 | — | 0 | $32.7M | 33 |
| Q1 2026 | $935K | 3 | $11.6M | 6 |
| Q4 2025 | $100K | 2 | — | 0 |
Valuation, profit and volume
P/E (trailing)n/aSector median —
Market value—
Profit margin—Revenue growth —
Volume vs. 50-day1.9×Last 5 sessions
Insiders' paper profit−$297KOn all tracked purchases -28.7%
Summary
Over the past 12 months, 2 MIAMI INTERNATIONAL HOLDINGS, INC. insiders reported open-market purchases totaling $1.0M, while 12 insiders reported sales totaling $81.6M. Among insiders with enough purchase history to measure, Murray Stahl (Director) has the highest Insider Score at 26. 67 of 69 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.
Insider transactions
Open-market purchases and sales.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| Oct 6SEC | Douglas M. Schafer Jr.Evp And Cio | Sell Plan | 40,000387,414 held (−9%) | $33.34 | $1.3M | -7.9% | — |
| Sep 17SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 21,217316,490 held (−6%) | $38.61 | $819K | -20.5% | — |
| Sep 4SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 47,0001,423,275 held (−3%) | $42.43 | $2.0M | -27.6% | — |
| Sep 4SEC | Douglas M. Schafer Jr.Evp And Cio | Sell Plan | 48,000387,414 held (−11%) | $40.48 | $1.9M | -24.1% | — |
| Sep 4SEC | Barbara J. ComlyEvp, Gc & Corporate Secretary | Sell Plan | 44,445839,564 held (−5%) | $40.49 | $1.8M | -24.2% | — |
| Sep 4SEC | Edward DeitzelEvp, Cro, Cco Miax Exchanges | Sell Plan | 11,000119,601 held (−8%) | $42.21 | $464K | -27.2% | — |
| Sep 4SEC | Judson Gray TeekellDirector | Sell Plan | 5,54581,000 held (−6%) | $41.58 | $231K | -26.1% | — |
| Sep 4SEC | Judson Gray TeekellDirector | Sell Plan | 3,00069,251 held (−4%) | $40.89 | $123K | -24.9% | — |
| Aug 20SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 149,7001,423,275 held (−10%) | $41.13 | $6.2M | -25.3% | — |
| Aug 19SEC | Lance EmmonsCFO | Sell Plan | 35,00086,538 held (−29%) | $42.83 | $1.5M | -28.3% | — |
| Aug 19SEC | Cynthia SchwarzkopfDirector | Sell Plan | 5,00088,545 held (−5%) | $42.85 | $214K | -28.3% | — |
| Aug 6SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 48,3341,723,275 held (−3%) | $45.69 | $2.2M | -32.8% | — |
| Aug 6SEC | Douglas M. Schafer Jr.Evp And Cio | Sell Plan | 48,000387,414 held (−11%) | $45.71 | $2.2M | -32.8% | — |
| Aug 6SEC | Barbara J. ComlyEvp, Gc & Corporate Secretary | Sell Plan | 44,445882,984 held (−5%) | $45.69 | $2.0M | -32.8% | — |
| Aug 6SEC | Harish JayabalanEvp, Ciso And Cro | Sell Plan | 20,00078,065 held (−20%) | $45.90 | $918K | -33.1% | — |
| Aug 6SEC | Edward DeitzelEvp, Cro, Cco Miax Exchanges | Sell Plan | 11,000119,601 held (−8%) | $45.78 | $504K | -32.9% | — |
| Aug 6SEC | Judson Gray TeekellDirector | Sell Plan | 3,00072,251 held (−4%) | $45.79 | $137K | -32.9% | — |
| Aug 6SEC | Kurt M. EckertDirector | Sell Plan | 1,063149,612 held (−1%) | $45.80 | $49K | -32.9% | — |
| Jul 16SEC | Cynthia SchwarzkopfDirector | Sell Plan | 5,00088,545 held (−5%) | $42.00 | $210K | -26.9% | — |
| Jul 14SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 70,0001,723,275 held (−4%) | $42.52 | $3.0M | -27.8% | — |
| Jul 14SEC | Barbara J. ComlyEvp, Gc & Corporate Secretary | Sell Plan | 28,000882,984 held (−3%) | $41.98 | $1.2M | -26.8% | — |
| Jul 7SEC | Douglas M. Schafer Jr.Evp And Cio | Sell Plan | 48,000387,414 held (−11%) | $41.22 | $2.0M | -25.5% | — |
| Jul 7SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 41,7721,723,275 held (−2%) | $42.09 | $1.8M | -27.0% | — |
| Jul 7SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 28,2281,723,275 held (−2%) | $42.27 | $1.2M | -27.3% | — |
| Jul 7SEC | Barbara J. ComlyEvp, Gc & Corporate Secretary | Sell Plan | 28,000882,984 held (−3%) | $41.22 | $1.2M | -25.5% | — |
| Jul 7SEC | Harish JayabalanEvp, Ciso And Cro | Sell Plan | 20,00078,065 held (−20%) | $42.12 | $842K | -27.1% | — |
| Jul 7SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 16,000353,990 held (−4%) | $42.13 | $674K | -27.1% | — |
| Jul 7SEC | Edward DeitzelEvp, Cro, Cco Miax Exchanges | Sell Plan | 11,000119,601 held (−8%) | $42.04 | $462K | -27.0% | — |
| Jul 7SEC | Kurt M. EckertDirector | Sell Plan | 5,250149,612 held (−3%) | $39.35 | $207K | -22.0% | — |
| Jul 7SEC | Judson Gray TeekellDirector | Sell Plan | 3,00075,251 held (−4%) | $40.00 | $120K | -23.2% | — |
| Jun 17SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 4,714316,714 held (−1%) | $44.23 | $209K | -30.6% | — |
| Jun 12SEC | Cynthia SchwarzkopfDirector | Sell Plan | 19,50081,308 held (−19%) | $41.73 | $814K | -26.4% | — |
| Jun 10SEC | Harish JayabalanEvp, Ciso And Cro | Sell Plan | 10,21773,405 held (−12%) | $40.12 | $410K | -23.5% | — |
| Jun 10SEC | Harish JayabalanEvp, Ciso And Cro | Sell Plan | 9,78373,405 held (−12%) | $40.04 | $392K | -23.3% | — |
| Jun 4SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 70,0001,723,275 held (−4%) | $42.36 | $3.0M | -27.5% | — |
| Jun 4SEC | Douglas M. Schafer Jr.Evp And Cio | Sell Plan | 48,000396,681 held (−11%) | $42.84 | $2.1M | -28.3% | — |
| Jun 4SEC | Barbara J. ComlyEvp, Gc & Corporate Secretary | Sell Plan | 28,000843,844 held (−3%) | $42.85 | $1.2M | -28.3% | — |
| Jun 4SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 16,000325,047 held (−5%) | $42.12 | $674K | -27.1% | — |
| Jun 4SEC | Edward DeitzelEvp, Cro, Cco Miax Exchanges | Sell Plan | 11,000116,221 held (−9%) | $42.16 | $464K | -27.2% | — |
| Jun 4SEC | Kurt M. EckertDirector | Sell Plan | 5,250142,375 held (−4%) | $42.76 | $224K | -28.2% | — |
| Jun 4SEC | Judson Gray TeekellDirector | Sell Plan | 3,00071,014 held (−4%) | $42.78 | $128K | -28.2% | — |
| May 18SEC | Lance EmmonsCFO | Sell Plan | 35,00084,262 held (−29%) | $56.36 | $2.0M | -45.5% | — |
| May 7SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 15,7711,723,275 held (−1%) | $47.92 | $756K | -35.9% | — |
| May 5SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 54,2291,723,275 held (−3%) | $47.26 | $2.6M | -35.0% | — |
| May 5SEC | Douglas M. Schafer Jr.Evp And Cio | Sell Plan | 48,000396,681 held (−11%) | $47.25 | $2.3M | -35.0% | — |
| May 5SEC | Barbara J. ComlyEvp, Gc & Corporate Secretary | Sell Plan | 28,000843,844 held (−3%) | $47.26 | $1.3M | -35.0% | — |
| May 5SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 16,000325,047 held (−5%) | $47.28 | $756K | -35.0% | — |
| May 5SEC | Edward DeitzelEvp, Cro, Cco Miax Exchanges | Sell Plan | 11,000116,221 held (−9%) | $47.28 | $520K | -35.0% | — |
| May 5SEC | Kurt M. EckertDirector | Sell Plan | 5,625142,375 held (−4%) | $47.29 | $266K | -35.1% | — |
| May 5SEC | Judson Gray TeekellDirector | Sell Plan | 3,00056,338 held (−5%) | $47.30 | $142K | -35.1% | — |
| Apr 17SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 104,1241,723,275 held (−6%) | $43.36 | $4.5M | -29.2% | — |
| Apr 17SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 70,0011,827,399 held (−4%) | $43.36 | $3.0M | -29.2% | — |
| Apr 17SEC | Thomas P. GallagherCEO, Chair | Sell Plan | 49,900485,963 held (−9%) | $43.68 | $2.2M | -29.7% | — |
| Apr 17SEC | Barbara J. ComlyEvp, Gc & Corporate Secretary | Sell Plan | 29,667843,844 held (−3%) | $43.64 | $1.3M | -29.6% | — |
| Apr 9SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 16,434325,047 held (−5%) | $42.08 | $692K | -27.0% | — |
| Apr 9SEC | Edward DeitzelEvp, Cro, Cco Miax Exchanges | Sell Plan | 7,572116,221 held (−6%) | $42.02 | $318K | -26.9% | — |
| Apr 9SEC | Edward DeitzelEvp, Cro, Cco Miax Exchanges | Sell Plan | 4,001116,221 held (−3%) | $42.00 | $168K | -26.9% | — |
| Apr 9SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 2,357325,047 held (−1%) | $41.33 | $97K | -25.7% | — |
| Apr 9SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 900325,047 held (−0%) | $42.00 | $38K | -26.9% | — |
| Apr 9SEC | Edward DeitzelEvp, Cro, Cco Miax Exchanges | Sell Plan | 762116,221 held (−1%) | $42.00 | $32K | -26.9% | — |
| Apr 8SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 2,357325,047 held (−1%) | $41.33 | $97K | -25.7% | — |
| Apr 8SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 900324,147 held (−0%) | $42.00 | $38K | -26.9% | — |
| Apr 3SEC | Judson Gray TeekellDirector | Sell Plan | 2,70059,338 held (−4%) | $40.00 | $108K | -23.2% | — |
| Mar 26SEC | Judson Gray TeekellDirector | Sell Plan | 30062,038 held (−0%) | $40.00 | $12K | -23.2% | — |
| Mar 24SEC | Shelly BrownEvp, Chief Strategy Officer | Sell Plan | 25,932299,197 held (−8%) | $39.33 | $1.0M | -21.9% | — |
| Mar 20SEC | Kurt M. EckertDirector | Sell Plan | 37,917142,375 held (−21%) | $39.00 | $1.5M | -21.3% | — |
| Mar 18SEC | Douglas M. Schafer Jr.Evp And Cio | Sell Plan | 48,000396,681 held (−11%) | $39.74 | $1.9M | -22.7% | — |
| Mar 6SEC | Murray StahlDirector | Sell | 53,5784,619,442 held (−1%) | $40.92 | $2.2M | -25.0% | 26 |
| Mar 6SEC | Murray StahlDirector | Buy | 7,2004,626,642 held (+0%) | $43.38 | $312K | -29.2% | 26 |
| Mar 6SEC | Murray StahlDirector | Buy | 7,2004,633,842 held (+0%) | $43.08 | $310K | -28.7% | 26 |
| Mar 5SEC | Horizon Kinetics Asset Management LlcInsider | Buy | 7,2004,696,666 held (+0%) | $43.38 | $312K | -29.2% | — |
| Mar 4SEC | Horizon Kinetics Asset Management LlcInsider | Sell | 121,0544,689,466 held (−3%) | $40.92 | $5.0M | -25.0% | — |
| Dec 15SEC | Murray StahlDirector | Buy | 2,4394,560,364 held (+0%) | $41.00 | $100K | -25.1% | 26 |
| Oct 6SEC | Horizon Kinetics Asset Management LlcInsider | Buy | 24,557,925 held (+0%) | $41.97 | $84 | -26.8% | — |
Insiders at MIAMI INTERNATIONAL HOLDINGS, INC.
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| Thomas P. GallagherCEO, Chair | — | $32.3M | Sep 4, 2026 | — |
| Douglas M. Schafer Jr.Evp And Cio | — | $13.7M | Oct 6, 2026 | — |
| Barbara J. ComlyEvp, Gc & Corporate Secretary | — | $10.0M | Sep 4, 2026 | — |
| Horizon Kinetics Asset Management LlcInsider | $312K | $5.0M | Mar 5, 2026 | — |
| Shelly BrownEvp, Chief Strategy Officer | — | $5.1M | Sep 17, 2026 | — |
| Murray StahlDirector | $723K | $2.2M | Mar 6, 2026 | 26 |
| Lance EmmonsCFO | — | $3.5M | Aug 19, 2026 | — |
| Edward DeitzelEvp, Cro, Cco Miax Exchanges | — | $2.9M | Sep 4, 2026 | — |
| Harish JayabalanEvp, Ciso And Cro | — | $2.6M | Aug 6, 2026 | — |
| Kurt M. EckertDirector | — | $2.2M | Aug 6, 2026 | — |
| Cynthia SchwarzkopfDirector | — | $1.2M | Aug 19, 2026 | — |
| Judson Gray TeekellDirector | — | $1.0M | Sep 4, 2026 | — |
MIAX stock: common questions
Are MIAMI INTERNATIONAL HOLDINGS, INC. insiders buying MIAX stock?
In the past 12 months, 2 insiders reported open-market purchases of MIAX worth $1.0M. The latest was Director Murray Stahl bought $312K of MIAX at $43.38 — largest purchase by this insider in our records.
Are MIAMI INTERNATIONAL HOLDINGS, INC. insiders selling MIAX stock?
12 insiders reported sales worth $81.6M over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.
What is MIAX's 52-week range?
Over the past year MIAX has traded between $30.18 and $56.84. It last closed at $30.71 on Oct 9, 2026.