MIAX Miami International Holdings, Inc.

NYSE
$41.47

Miami International Holdings, Inc. (MIAX) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal In line Selling ran in line with MIAX's own trailing one-year pace, with 91% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 10 sellers in the last 90 days
Insiders buying
1
6 transactions
Insiders selling
11
67 transactions
Purchases
$1.0M
24,045 shares
Sales
$79.5M
1,849,327 shares
Net activity
-$78.5M
purchases less sales

How much of that selling was preplanned? 91% planned / 9% discretionary

10b5-1 plan sales $72.0M 61 transactions · 1,665,593 shares
Discretionary sales $7.5M 6 transactions · 183,734 shares

Largest single sale: $6.2M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: March 5, 2026 .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Gallagher Thomas P. Chairman & CEO Sell 10b5-1 47,000 $42.43 $2.0M 1,423,275 −3.2% of holding
Deitzel Edward EVP, CRO, CCO MIAX Exchanges Sell 10b5-1 11,000 $42.21 $464.3K 119,601 −8.4% of holding
Schafer Douglas M. JR EVP and CIO Sell 10b5-1 48,000 $40.48 $1.9M 387,414 −11% of holding
Comly Barbara J. EVP, GC & Corporate Secretary Sell 10b5-1 44,445 $40.49 $1.8M 839,564 −5% of holding
Teekell Judson Gray Director Sell 5,545 $41.58 $230.6K 81,000 −6.4% of holding
Teekell Judson Gray Director Sell 10b5-1 3,000 $40.89 $122.7K 69,251 −4.2% of holding
Gallagher Thomas P. Chairman & CEO Sell 10b5-1 149,700 $41.13 $6.2M 1,423,275 −9.5% of holding
Emmons Lance EVP and CFO Sell 10b5-1 35,000 $42.83 $1.5M 86,538 −28.8% of holding
Schwarzkopf Cynthia Director Sell 10b5-1 5,000 $42.85 $214.3K 88,545 −5.3% of holding
Gallagher Thomas P. Chairman & CEO Sell 10b5-1 48,334 $45.69 $2.2M 1,723,275 −2.7% of holding
Schafer Douglas M. JR EVP and CIO Sell 10b5-1 48,000 $45.71 $2.2M 387,414 −11% of holding
Comly Barbara J. EVP, GC & Corporate Secretary Sell 10b5-1 44,445 $45.69 $2.0M 882,984 −4.8% of holding
Jayabalan Harish EVP, CISO and CRO Sell 10b5-1 20,000 $45.90 $918.0K 78,065 −20.4% of holding
Deitzel Edward EVP, CRO, CCO MIAX Exchanges Sell 10b5-1 11,000 $45.78 $503.6K 119,601 −8.4% of holding
Teekell Judson Gray Director Sell 10b5-1 3,000 $45.79 $137.4K 72,251 −4% of holding
Eckert Kurt M. Director Sell 10b5-1 1,063 $45.80 $48.7K 149,612 −0.7% of holding
Schwarzkopf Cynthia Director Sell 10b5-1 5,000 $42.00 $210.0K 88,545 −5.3% of holding
Gallagher Thomas P. Chairman & CEO Sell 10b5-1 70,000 $42.52 $3.0M 1,723,275 −3.9% of holding
Comly Barbara J. EVP, GC & Corporate Secretary Sell 10b5-1 28,000 $41.98 $1.2M 882,984 −3.1% of holding
Gallagher Thomas P. Chairman & CEO Sell 10b5-1 28,228 $42.27 $1.2M 1,723,275 −1.6% of holding
Gallagher Thomas P. Chairman & CEO Sell 10b5-1 41,772 $42.09 $1.8M 1,723,275 −2.4% of holding
Jayabalan Harish EVP, CISO and CRO Sell 10b5-1 20,000 $42.12 $842.4K 78,065 −20.4% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 10b5-1 16,000 $42.13 $674.1K 353,990 −4.3% of holding
Deitzel Edward EVP, CRO, CCO MIAX Exchanges Sell 10b5-1 11,000 $42.04 $462.4K 119,601 −8.4% of holding
Schafer Douglas M. JR EVP and CIO Sell 10b5-1 48,000 $41.22 $2.0M 387,414 −11% of holding
Comly Barbara J. EVP, GC & Corporate Secretary Sell 10b5-1 28,000 $41.22 $1.2M 882,984 −3.1% of holding
Eckert Kurt M. Director Sell 10b5-1 5,250 $39.35 $206.6K 149,612 −3.4% of holding
Teekell Judson Gray Director Sell 10b5-1 3,000 $40.00 $120.0K 75,251 −3.8% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 10b5-1 4,714 $44.23 $208.5K 316,714 −1.5% of holding
Schwarzkopf Cynthia Director Sell 10b5-1 19,500 $41.73 $813.7K 81,308 −19.3% of holding
Jayabalan Harish EVP, CISO and CRO Sell 10b5-1 9,783 $40.04 $391.7K 73,405 −11.8% of holding
Jayabalan Harish EVP, CISO and CRO Sell 10b5-1 10,217 $40.12 $409.9K 73,405 −12.2% of holding
Gallagher Thomas P. Chairman & CEO Sell 10b5-1 70,000 $42.36 $3.0M 1,723,275 −3.9% of holding
Schafer Douglas M. JR EVP and CIO Sell 10b5-1 48,000 $42.84 $2.1M 396,681 −10.8% of holding
Comly Barbara J. EVP, GC & Corporate Secretary Sell 10b5-1 28,000 $42.85 $1.2M 843,844 −3.2% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 10b5-1 16,000 $42.12 $673.9K 325,047 −4.7% of holding
Deitzel Edward EVP, CRO, CCO MIAX Exchanges Sell 10b5-1 11,000 $42.16 $463.8K 116,221 −8.6% of holding
Eckert Kurt M. Director Sell 10b5-1 5,250 $42.76 $224.5K 142,375 −3.6% of holding
Teekell Judson Gray Director Sell 10b5-1 3,000 $42.78 $128.3K 71,014 −4.1% of holding
Emmons Lance EVP and CFO Sell 10b5-1 35,000 $56.36 $2.0M 84,262 −29.3% of holding
Gallagher Thomas P. Chairman & CEO Sell 10b5-1 15,771 $47.92 $755.7K 1,723,275 −0.9% of holding
Gallagher Thomas P. Chairman & CEO Sell 10b5-1 54,229 $47.26 $2.6M 1,723,275 −3.1% of holding
Schafer Douglas M. JR EVP and CIO Sell 10b5-1 48,000 $47.25 $2.3M 396,681 −10.8% of holding
Comly Barbara J. EVP, GC & Corporate Secretary Sell 10b5-1 28,000 $47.26 $1.3M 843,844 −3.2% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 10b5-1 16,000 $47.28 $756.5K 325,047 −4.7% of holding
Deitzel Edward EVP, CRO, CCO MIAX Exchanges Sell 10b5-1 11,000 $47.28 $520.1K 116,221 −8.6% of holding
Eckert Kurt M. Director Sell 10b5-1 5,625 $47.29 $266.0K 142,375 −3.8% of holding
Teekell Judson Gray Director Sell 10b5-1 3,000 $47.30 $141.9K 56,338 −5.1% of holding
Gallagher Thomas P. 3 fills Chairman & CEO Sell 10b5-1 224,025 $43.43 $9.7M 1,827,399 −10.9% of holding
Comly Barbara J. EVP, GC & Corporate Secretary Sell 10b5-1 29,667 $43.64 $1.3M 843,844 −3.4% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 10b5-1 16,434 $42.08 $691.5K 325,047 −4.8% of holding
Deitzel Edward EVP, CRO, CCO MIAX Exchanges Sell 10b5-1 7,572 $42.02 $318.2K 116,221 −6.1% of holding
Deitzel Edward 2 fills EVP, CRO, CCO MIAX Exchanges Sell 10b5-1 4,763 $42.00 $200.0K 116,221 −3.9% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 900 $42.00 $37.8K 325,047 −0.3% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 10b5-1 900 $42.00 $37.8K 324,147 −0.3% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 2,357 $41.33 $97.4K 325,047 −0.7% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 10b5-1 2,357 $41.33 $97.4K 325,047 −0.7% of holding
Teekell Judson Gray Director Sell 10b5-1 2,700 $40.00 $108.0K 59,338 −4.4% of holding
Teekell Judson Gray Director Sell 300 $40.00 $12.0K 62,038 −0.5% of holding
Brown Shelly EVP, Chief Strategy Officer Sell 10b5-1 25,932 $39.33 $1.0M 299,197 −8% of holding
Eckert Kurt M. Director Sell 10b5-1 37,917 $39.00 $1.5M 142,375 −21% of holding
Schafer Douglas M. JR EVP and CIO Sell 10b5-1 48,000 $39.74 $1.9M 396,681 −10.8% of holding
Buy 7,200 $43.08 $310.2K 4,633,842
2 fills Buy 14,400 $43.38 $624.7K 4,696,666
2 fills Sell 174,632 $40.92 $7.1M 4,689,466 −3.6% of holding
Buy 2,439 $41.00 $100.0K 4,560,364
Buy 2 $41.97 $84 4,557,925
Buy 4 $41.76 $167 4,557,923

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.