Miami International Holdings, Inc. (MIAX) has 9 known insider and institutional holders on record. The largest holder is STAHL MURRAY with 4,619,442 shares. Other notable holders include Gallagher Thomas P. and Comly Barbara J..
Over the last 12 months, insiders have made 17 transactions in MIAX stock — 3 buys (valued at $934.85K) and 4 sells (valued at $3.33M). Insider selling has exceeded buying during this period.
MIAX Insider Ownership
Top Holder
STAHL MURRAY
4,619,442 shares
Buys (12 mo)
3
$934.85K value
Sells (12 mo)
4
$3.33M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Stahl Murray |
Director |
4,619,442 |
2026-03-06 |
|
| 2 |
Gallagher Thomas P. |
Chairman & CEO |
1,827,399 |
2026-04-01 |
|
| 3 |
Comly Barbara J. |
EVP, Gc & Corporate Secretary |
843,844 |
2026-04-01 |
|
| 4 |
Brown Shelly |
EVP, Chief Strategy Officer |
299,197 |
2026-03-24 |
|
| 5 |
Smollen John |
EVP, New Product Development |
170,757 |
2026-04-01 |
|
| 6 |
Emmons Lance |
EVP and CFO |
119,262 |
2026-04-01 |
|
| 7 |
Deitzel Edward |
EVP, Cro, Cco Miax Exchanges |
116,221 |
2026-04-01 |
|
| 8 |
Schafer Douglas M. Jr |
EVP and CIO |
102,000 |
2026-03-18 |
|
| 9 |
Teekell Judson Gray |
Director |
59,338 |
2026-04-03 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-02 |
Teekell Judson Gray |
Director |
Informative Sell |
2,700 |
$40.00 |
$108K |
| 2026-03-30 |
Comly Barbara J. |
EVP, Gc & Corporate Secretary |
Tax Withholding of RSU |
1,448 |
$37.50 |
$54.3K |
| 2026-03-30 |
Smollen John |
EVP, New Product Development |
Tax Withholding of RSU |
362 |
$37.50 |
$13.58K |
| 2026-03-30 |
Emmons Lance |
EVP and CFO |
Tax Withholding of RSU |
8,350 |
$37.50 |
$313.13K |
| 2026-03-30 |
Deitzel Edward |
EVP, Cro, Cco Miax Exchanges |
Tax Withholding of RSU |
707 |
$37.50 |
$26.51K |
| 2026-03-30 |
Brown Shelly |
EVP, Chief Strategy Officer |
Option Exercise (Sell) |
5,040 |
$19.84 |
$99.99K |
| 2026-03-30 |
Gallagher Thomas P. |
Chairman & CEO |
Tax Withholding of RSU |
20,875 |
$37.50 |
$782.81K |
| 2026-03-25 |
Sommers Jill E. |
Director |
Unknown |
8,306 |
$22.34 |
$185.56K |
| 2026-03-25 |
Teekell Judson Gray |
Director |
Informative Sell |
300 |
$40.00 |
$12K |
| 2026-03-23 |
Brown Shelly |
EVP, Chief Strategy Officer |
Informative Sell |
25,932 |
$39.33 |
$1.02M |
| 2026-03-19 |
Eckert Kurt M. |
Director |
Option Exercise (Sell) |
12,917 |
$12.00 |
$155K |
| 2026-03-17 |
Schafer Douglas M. Jr |
EVP and CIO |
Option Exercise (Sell) |
48,000 |
$12.00 |
$576K |
| 2026-03-05 |
Stahl Murray |
Director |
Informative Buy |
7,200 |
$43.08 |
$310.18K |
| 2026-03-04 |
Stahl Murray |
Director |
Informative Buy |
7,200 |
$43.38 |
$312.34K |
| 2026-03-02 |
Stahl Murray |
Director |
Informative Sell |
53,578 |
$40.92 |
$2.19M |
| 2026-03-04 |
Stahl Murray |
Director |
Informative Buy |
7,200 |
$43.38 |
$312.34K |
| 2026-03-02 |
Stahl Murray |
Director |
Option Exercise (ITM) |
38,927 |
$20.50 |
$798K |
