MIAX insider buying and SEC filings, explained
Miami International Holdings, Inc. · CIK 1438472
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$623K
Insiders who bought
1
Sold (not marked 10b5-1)
$0
Planned sales (10b5-1)
$75.1M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 22, 2026 | Planned (10b5-1) | Barbara J. Comly (EVP, GC & Corporate Secretary) sold 12,306 shares at about $35.04 ($431K), marked as a 10b5-1 plan trade. Holdings down 1% to 839,564 shares. | SEC filing Filed Oct 26, 2026, 4:06 PM ET |
| Oct 22, 2026 | Planned (10b5-1) | Douglas M. Schafer JR (EVP and CIO) sold 8,000 shares at about $35.06 ($280K), marked as a 10b5-1 plan trade. Holdings down 2% to 387,414 shares. | SEC filing Filed Oct 26, 2026, 4:05 PM ET |
| Oct 2, 2026 | Planned (10b5-1) | Douglas M. Schafer JR (EVP and CIO) sold 40,000 shares at about $33.34 ($1.3M), marked as a 10b5-1 plan trade. Holdings down 9% to 387,414 shares. | SEC filing Filed Oct 6, 2026, 5:28 PM ET |
| Sep 16, 2026 | Planned (10b5-1) | Shelly Brown (EVP, Chief Strategy Officer) sold 21,217 shares at about $38.61 ($819K), marked as a 10b5-1 plan trade. Holdings down 6% to 316,490 shares. | SEC filing Filed Sep 17, 2026 |
| Sep 3, 2026 | Planned (10b5-1) | Edward Deitzel (EVP, CRO, CCO MIAX Exchanges) sold 11,000 shares at about $42.21 ($464K), marked as a 10b5-1 plan trade. Holdings down 8% to 119,601 shares. | SEC filing Filed Sep 4, 2026 |
| Sep 3, 2026 | Planned (10b5-1) | Thomas P. Gallagher (CEO and Director) sold 47,000 shares indirectly (by entity) at about $42.43 ($2.0M), marked as a 10b5-1 plan trade. Holdings by entity down 3% to 1,423,275 shares. | SEC filing Filed Sep 4, 2026 |
| Sep 2, 2026 | Planned (10b5-1) | Barbara J. Comly (EVP, GC & Corporate Secretary) sold 44,445 shares at about $40.49 ($1.8M), marked as a 10b5-1 plan trade. Holdings down 5% to 839,564 shares. | SEC filing Filed Sep 4, 2026 |
| Sep 2, 2026 | Planned (10b5-1) | Douglas M. Schafer JR (EVP and CIO) sold 48,000 shares at about $40.48 ($1.9M), marked as a 10b5-1 plan trade. Holdings down 11% to 387,414 shares. | SEC filing Filed Sep 4, 2026 |
| Sep 2, 2026 | Planned (10b5-1) | Judson Gray Teekell (Director) sold 8,545 shares directly and indirectly at about $41.34 ($353K), marked as a 10b5-1 plan trade. Direct holdings down 4% to 69,251 shares. | SEC filing Filed Sep 4, 2026 |
| Aug 19, 2026 | Planned (10b5-1) | Thomas P. Gallagher (CEO and Director) sold 149,700 shares indirectly (by entity) at about $41.13 ($6.2M), marked as a 10b5-1 plan trade. Holdings by entity down 10% to 1,423,275 shares. | SEC filing Filed Aug 20, 2026 |
| Aug 17, 2026 | Planned (10b5-1) | Cynthia Schwarzkopf (Director) sold 5,000 shares at about $42.85 ($214K), marked as a 10b5-1 plan trade. Holdings down 5% to 88,545 shares. | SEC filing Filed Aug 19, 2026 |
| Aug 17, 2026 | Planned (10b5-1) | Lance Emmons (CFO) sold 35,000 shares at about $42.83 ($1.5M), marked as a 10b5-1 plan trade. Holdings down 29% to 86,538 shares. | SEC filing Filed Aug 19, 2026 |
| Aug 4, 2026 | Planned (10b5-1) | Barbara J. Comly (EVP, GC & Corporate Secretary) sold 44,445 shares at about $45.69 ($2.0M), marked as a 10b5-1 plan trade. Holdings down 5% to 882,984 shares. | SEC filing Filed Aug 6, 2026 |
| Aug 4, 2026 | Planned (10b5-1) | Kurt M. Eckert (Director) sold 1,063 shares at about $45.80 ($49K), marked as a 10b5-1 plan trade. Holdings down 1% to 149,612 shares. | SEC filing Filed Aug 6, 2026 |
| Aug 4, 2026 | Planned (10b5-1) | Edward Deitzel (EVP, CRO, CCO MIAX Exchanges) sold 11,000 shares at about $45.78 ($504K), marked as a 10b5-1 plan trade. Holdings down 8% to 119,601 shares. | SEC filing Filed Aug 6, 2026 |
| Aug 4, 2026 | Planned (10b5-1) | Harish Jayabalan (EVP, CISO and CRO) sold 20,000 shares at about $45.90 ($918K), marked as a 10b5-1 plan trade. Holdings down 20% to 78,065 shares. | SEC filing Filed Aug 6, 2026 |
| Aug 4, 2026 | Planned (10b5-1) | Thomas P. Gallagher (CEO and Director) sold 48,334 shares indirectly (by entity) at about $45.69 ($2.2M), marked as a 10b5-1 plan trade. Holdings by entity down 3% to 1,723,275 shares. | SEC filing Filed Aug 6, 2026 |
| Aug 4, 2026 | Planned (10b5-1) | Douglas M. Schafer JR (EVP and CIO) sold 48,000 shares at about $45.71 ($2.2M), marked as a 10b5-1 plan trade. Holdings down 11% to 387,414 shares. | SEC filing Filed Aug 6, 2026 |
| Aug 4, 2026 | Planned (10b5-1) | Judson Gray Teekell (Director) sold 3,000 shares at about $45.79 ($137K), marked as a 10b5-1 plan trade. Holdings down 4% to 72,251 shares. | SEC filing Filed Aug 6, 2026 |
| Jul 15, 2026 | Planned (10b5-1) | Cynthia Schwarzkopf (Director) sold 5,000 shares at $42.00 ($210K), marked as a 10b5-1 plan trade. Holdings down 5% to 88,545 shares. | SEC filing Filed Jul 16, 2026 |
| Jul 13, 2026 | Planned (10b5-1) | Barbara J. Comly (EVP, GC & Corporate Secretary) sold 28,000 shares at about $41.98 ($1.2M), marked as a 10b5-1 plan trade. Holdings down 3% to 882,984 shares. | SEC filing Filed Jul 14, 2026 |
| Jul 13, 2026 | Planned (10b5-1) | Thomas P. Gallagher (CEO and Director) sold 70,000 shares indirectly (by entity) at about $42.52 ($3.0M), marked as a 10b5-1 plan trade. Holdings by entity down 4% to 1,723,275 shares. | SEC filing Filed Jul 14, 2026 |
| Jul 6–7, 2026 | Planned (10b5-1) | Thomas P. Gallagher (CEO and Director) sold 70,000 shares indirectly (by entity) between Jul 6 and Jul 7 at about $42.16 ($3.0M), marked as a 10b5-1 plan trade. Holdings by entity down 4% to 1,723,275 shares. | SEC filing Filed Jul 7, 2026 |
| Jul 6, 2026 | Planned (10b5-1) | Harish Jayabalan (EVP, CISO and CRO) sold 20,000 shares at about $42.12 ($842K), marked as a 10b5-1 plan trade. Holdings down 20% to 78,065 shares. | SEC filing Filed Jul 7, 2026 |
| Jul 6, 2026 | Planned (10b5-1) | Edward Deitzel (EVP, CRO, CCO MIAX Exchanges) sold 11,000 shares at about $42.04 ($462K), marked as a 10b5-1 plan trade. Holdings down 8% to 119,601 shares. | SEC filing Filed Jul 7, 2026 |
| Jul 6, 2026 | Planned (10b5-1) | Shelly Brown (EVP, Chief Strategy Officer) sold 16,000 shares at about $42.13 ($674K), marked as a 10b5-1 plan trade. Holdings down 4% to 353,990 shares. | SEC filing Filed Jul 7, 2026 |
| Jul 2, 2026 | Planned (10b5-1) | Judson Gray Teekell (Director) sold 3,000 shares at $40.00 ($120K), marked as a 10b5-1 plan trade. Holdings down 4% to 75,251 shares. | SEC filing Filed Jul 7, 2026 |
| Jul 2, 2026 | Planned (10b5-1) | Kurt M. Eckert (Director) sold 5,250 shares at $39.35 ($207K), marked as a 10b5-1 plan trade. Holdings down 3% to 149,612 shares. | SEC filing Filed Jul 7, 2026 |
| Jul 2, 2026 | Planned (10b5-1) | Barbara J. Comly (EVP, GC & Corporate Secretary) sold 28,000 shares at about $41.22 ($1.2M), marked as a 10b5-1 plan trade. Holdings down 3% to 882,984 shares. | SEC filing Filed Jul 7, 2026 |
| Jul 2, 2026 | Planned (10b5-1) | Douglas M. Schafer JR (EVP and CIO) sold 48,000 shares at about $41.22 ($2.0M), marked as a 10b5-1 plan trade. Holdings down 11% to 387,414 shares. | SEC filing Filed Jul 7, 2026 |
| Jun 15, 2026 | Planned (10b5-1) | Shelly Brown (EVP, Chief Strategy Officer) sold 4,714 shares at about $44.23 ($209K), marked as a 10b5-1 plan trade. Holdings down 1% to 316,714 shares. | SEC filing Filed Jun 17, 2026 |
| Jun 11, 2026 | Planned (10b5-1) | Cynthia Schwarzkopf (Director) sold 19,500 shares at about $41.73 ($814K), marked as a 10b5-1 plan trade. Holdings down 19% to 81,308 shares. | SEC filing Filed Jun 12, 2026 |
| Jun 8–9, 2026 | Planned (10b5-1) | Harish Jayabalan (EVP, CISO and CRO) sold 20,000 shares between Jun 8 and Jun 9 at about $40.08 ($802K), marked as a 10b5-1 plan trade. Holdings down 21% to 73,405 shares. | SEC filing Filed Jun 10, 2026 |
| Jun 2, 2026 | Planned (10b5-1) | Barbara J. Comly (EVP, GC & Corporate Secretary) sold 28,000 shares at about $42.85 ($1.2M), marked as a 10b5-1 plan trade. Holdings down 3% to 843,844 shares. | SEC filing Filed Jun 4, 2026 |
| Jun 2, 2026 | Planned (10b5-1) | Kurt M. Eckert (Director) sold 5,250 shares at about $42.76 ($224K), marked as a 10b5-1 plan trade. Holdings down 4% to 142,375 shares. | SEC filing Filed Jun 4, 2026 |
| Jun 2, 2026 | Planned (10b5-1) | Edward Deitzel (EVP, CRO, CCO MIAX Exchanges) sold 11,000 shares at about $42.16 ($464K), marked as a 10b5-1 plan trade. Holdings down 9% to 116,221 shares. | SEC filing Filed Jun 4, 2026 |
| Jun 2, 2026 | Planned (10b5-1) | Shelly Brown (EVP, Chief Strategy Officer) sold 16,000 shares at about $42.12 ($674K), marked as a 10b5-1 plan trade. Holdings down 5% to 325,047 shares. | SEC filing Filed Jun 4, 2026 |
| Jun 2, 2026 | Planned (10b5-1) | Thomas P. Gallagher (CEO and Director) sold 70,000 shares indirectly (by entity) at about $42.36 ($3.0M), marked as a 10b5-1 plan trade. Holdings by entity down 4% to 1,723,275 shares. | SEC filing Filed Jun 4, 2026 |
| Jun 2, 2026 | Planned (10b5-1) | Douglas M. Schafer JR (EVP and CIO) sold 48,000 shares at about $42.84 ($2.1M), marked as a 10b5-1 plan trade. Holdings down 11% to 396,681 shares. | SEC filing Filed Jun 4, 2026 |
| Jun 2, 2026 | Planned (10b5-1) | Judson Gray Teekell (Director) sold 3,000 shares at about $42.78 ($128K), marked as a 10b5-1 plan trade. Holdings down 4% to 71,014 shares. | SEC filing Filed Jun 4, 2026 |
| May 15, 2026 | Planned (10b5-1) | Lance Emmons (CFO) sold 35,000 shares at $56.36 ($2.0M), marked as a 10b5-1 plan trade. Holdings down 29% to 84,262 shares. | SEC filing Filed May 18, 2026 |
| May 5, 2026 | Planned (10b5-1) | Thomas P. Gallagher (CEO and Director) sold 15,771 shares indirectly (by entity) at about $47.92 ($756K), marked as a 10b5-1 plan trade. Holdings by entity down 1% to 1,723,275 shares. | SEC filing Filed May 7, 2026 |
| May 4, 2026 | Planned (10b5-1) | Barbara J. Comly (EVP, GC & Corporate Secretary) sold 28,000 shares at $47.26 ($1.3M), marked as a 10b5-1 plan trade. Holdings down 3% to 843,844 shares. | SEC filing Filed May 5, 2026 |
| May 4, 2026 | Planned (10b5-1) | Kurt M. Eckert (Director) sold 5,625 shares at about $47.29 ($266K), marked as a 10b5-1 plan trade. Holdings down 4% to 142,375 shares. | SEC filing Filed May 5, 2026 |
| May 4, 2026 | Planned (10b5-1) | Shelly Brown (EVP, Chief Strategy Officer) sold 16,000 shares at about $47.28 ($756K), marked as a 10b5-1 plan trade. Holdings down 5% to 325,047 shares. | SEC filing Filed May 5, 2026 |
| May 4, 2026 | Planned (10b5-1) | Douglas M. Schafer JR (EVP and CIO) sold 48,000 shares at about $47.25 ($2.3M), marked as a 10b5-1 plan trade. Holdings down 11% to 396,681 shares. | SEC filing Filed May 5, 2026 |
| May 4, 2026 | Planned (10b5-1) | Judson Gray Teekell (Director) sold 3,000 shares at about $47.30 ($142K), marked as a 10b5-1 plan trade. Holdings down 5% to 56,338 shares. | SEC filing Filed May 5, 2026 |
| May 4, 2026 | Planned (10b5-1) | Thomas P. Gallagher (CEO and Director) sold 54,229 shares indirectly (by entity) at $47.26 ($2.6M), marked as a 10b5-1 plan trade. Holdings by entity down 3% to 1,723,275 shares. | SEC filing Filed May 5, 2026 |
| May 4, 2026 | Planned (10b5-1) | Edward Deitzel (EVP, CRO, CCO MIAX Exchanges) sold 11,000 shares at about $47.28 ($520K), marked as a 10b5-1 plan trade. Holdings down 9% to 116,221 shares. | SEC filing Filed May 5, 2026 |
| Apr 15, 2026 | Planned (10b5-1) | Thomas P. Gallagher (CEO and Director) sold 224,025 shares directly and indirectly (by entity) at about $43.43 ($9.7M), marked as a 10b5-1 plan trade. Direct holdings down 9% to 485,963 shares. | SEC filing Filed Apr 17, 2026 |
| Apr 15, 2026 | Planned (10b5-1) | Barbara J. Comly (EVP, GC & Corporate Secretary) sold 29,667 shares at about $43.64 ($1.3M), marked as a 10b5-1 plan trade. Holdings down 3% to 843,844 shares. | SEC filing Filed Apr 17, 2026 |
| Apr 8, 2026 | Planned (10b5-1) | Shelly Brown (EVP, Chief Strategy Officer) sold 16,434 shares at about $42.08 ($692K), marked as a 10b5-1 plan trade. Holdings down 5% to 325,047 shares. | SEC filing Filed Apr 9, 2026 |
| Apr 7–8, 2026 | Planned (10b5-1) | Edward Deitzel (EVP, CRO, CCO MIAX Exchanges) sold 12,335 shares between Apr 7 and Apr 8 at about $42.01 ($518K), marked as a 10b5-1 plan trade. Holdings down 10% to 116,221 shares. | SEC filing Filed Apr 9, 2026 |
| Apr 6–7, 2026 | Planned (10b5-1) Amended filing | Shelly Brown (EVP, Chief Strategy Officer) sold 3,257 shares between Apr 6 and Apr 7 at about $41.52 ($135K), marked as a 10b5-1 plan trade. Holdings down 1% to 325,047 shares. This amends a filing from Apr 8. | SEC filing Filed Apr 9, 2026 |
| Apr 2, 2026 | Planned (10b5-1) | Judson Gray Teekell (Director) sold 2,700 shares at $40.00 ($108K), marked as a 10b5-1 plan trade. Holdings down 4% to 59,338 shares. | SEC filing Filed Apr 3, 2026 |
| Mar 25, 2026 | Planned (10b5-1) | Judson Gray Teekell (Director) sold 300 shares at about $40.00 ($12K), marked as a 10b5-1 plan trade. Holdings down <1% to 62,038 shares. | SEC filing Filed Mar 26, 2026 |
| Mar 23, 2026 | Planned (10b5-1) | Shelly Brown (EVP, Chief Strategy Officer) sold 25,932 shares at about $39.33 ($1.0M), marked as a 10b5-1 plan trade. Holdings down 8% to 299,197 shares. | SEC filing Filed Mar 24, 2026 |
| Mar 19, 2026 | Planned (10b5-1) | Kurt M. Eckert (Director) sold 37,917 shares at about $39.00 ($1.5M), marked as a 10b5-1 plan trade. Holdings down 21% to 142,375 shares. | SEC filing Filed Mar 20, 2026 |
| Mar 17, 2026 | Planned (10b5-1) | Douglas M. Schafer JR (EVP and CIO) sold 48,000 shares at about $39.74 ($1.9M), marked as a 10b5-1 plan trade. Holdings down 11% to 396,681 shares. | SEC filing Filed Mar 18, 2026 |
| Mar 5, 2026 | Purchase (code P) | Murray Stahl (Director and 10% owner) bought 7,200 shares indirectly (by entity) at $43.08 ($310K), reported as a purchase (code P). Holdings by entity up <1% to 4,633,842 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Mar 6, 2026 |
| Mar 4, 2026 | Purchase (code P) Amended filing | Murray Stahl (Director and 10% owner) bought 7,200 shares indirectly (by entity) at $43.38 ($312K), reported as a purchase (code P). Holdings by entity up <1% to 4,626,642 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. This amends a filing from Mar 5. | SEC filing Filed Mar 6, 2026 |
| Dec 12, 2025 | Other purchase | Murray Stahl (Director and 10% owner) bought 2,439 Common Stock indirectly (by entity) at $41.00 ($100K) in a public offering. Holdings by entity up <1% to 4,560,364 shares. Not marked as a 10b5-1 plan trade. Filed jointly with 1 other reporting owner. | SEC filing Filed Dec 15, 2025 |
99 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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