Miami International Holdings, Inc. (MIAX) insider trading.
In Q3 2026, insiders at Miami International Holdings, Inc. reported 66 non-derivative transactions on 31 Forms 3, 4 and 5: 0 open-market purchases and 29 sales worth $36.0M.
- Transactions
- 66
- Purchases (P)
- 0
- Sales (S)
- 29
- Net shares, P minus S
- -849,999
- Insiders
- 11
- Last filed
- 2026-09-29
Insiders
| Insider | Relationship | Transactions | Buys | Sales |
|---|---|---|---|---|
| Gallagher Thomas P. | Director, Officer · Chairman & CEO | 16 | 0 | 6 |
| Comly Barbara J. | Officer · EVP, GC & Corporate Secretary | 9 | 0 | 4 |
| Jayabalan Harish | Officer · EVP, CISO and CRO | 8 | 0 | 2 |
| Schafer Douglas M. JR | Officer · EVP and CIO | 8 | 0 | 3 |
| Deitzel Edward | Officer · EVP, CRO, CCO MIAX Exchanges | 7 | 0 | 3 |
| Brown Shelly | Officer · EVP, Chief Strategy Officer | 4 | 0 | 2 |
| Teekell Judson Gray | Director | 4 | 0 | 4 |
| Schwarzkopf Cynthia | Director | 4 | 0 | 2 |
| Eckert Kurt M. | Director | 4 | 0 | 2 |
| Emmons Lance | Officer · EVP and CFO | 1 | 0 | 1 |
| Brown David A | Director | 1 | 0 | 0 |
Transactions
| Date | Insider | Code | Shares | Price | Owned after | Filing |
|---|---|---|---|---|---|---|
| 2026-09-25 | Jayabalan Harish | M (A) | 8,333 | $12 | 86,398 | Form 4 |
| 2026-09-16 | Brown Shelly | S (D) | 21,217 | $38.61 | 316,490 | Form 4 |
| 2026-09-11 | Brown Shelly | F (D) | 16,283 | $42.54 | 337,707 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | M (A) | 47,000 | $12 | 1,470,275 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | S (D) | 47,000 | $42.43 | 1,423,275 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | M (A) | 16,666 | $12 | 760,605 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | M (A) | 8,333 | $12 | 768,938 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | M (A) | 13,140 | $15.22 | 782,078 | Form 4 |
| 2026-09-03 | Gallagher Thomas P. | M (A) | 4,464 | $22.4 | 786,542 | Form 4 |
| 2026-09-03 | Deitzel Edward | M (A) | 11,000 | $12 | 130,601 | Form 4 |
| 2026-09-03 | Deitzel Edward | S (D) | 11,000 | $42.21 | 119,601 | Form 4 |
| 2026-09-02 | Teekell Judson Gray | S (D) | 5,545 | $41.58 | 81,000 | Form 4 |
| 2026-09-02 | Teekell Judson Gray | S (D) | 3,000 | $40.89 | 69,251 | Form 4 |
| 2026-09-02 | Schafer Douglas M. JR | S (D) | 48,000 | $40.48 | 387,414 | Form 4 |
| 2026-09-02 | Schafer Douglas M. JR | M (A) | 4,666 | $12 | 435,414 | Form 4 |
| 2026-09-02 | Schafer Douglas M. JR | M (A) | 43,334 | $12 | 430,748 | Form 4 |
| 2026-09-02 | Comly Barbara J. | S (D) | 44,445 | $40.49 | 839,564 | Form 4 |
| 2026-09-02 | Comly Barbara J. | M (A) | 44,445 | $12 | 884,009 | Form 4 |
| 2026-08-19 | Gallagher Thomas P. | S (D) | 149,700 | $41.13 | 1,423,275 | Form 4 |
| 2026-08-18 | Gallagher Thomas P. | F (D) | 150,300 | $42.41 | 1,572,975 | Form 4 |
| 2026-08-18 | Comly Barbara J. | F (D) | 43,420 | $42.41 | 839,564 | Form 4 |
| 2026-08-17 | Emmons Lance | S (D) | 35,000 | $42.83 | 86,538 | Form 4 |
| 2026-08-17 | Schwarzkopf Cynthia | M (A) | 5,000 | $12 | 93,545 | Form 4 |
| 2026-08-17 | Schwarzkopf Cynthia | S (D) | 5,000 | $42.85 | 88,545 | Form 4 |
| 2026-08-04 | Teekell Judson Gray | S (D) | 3,000 | $45.79 | 72,251 | Form 4 |
| 2026-08-04 | Schafer Douglas M. JR | M (A) | 48,000 | $12 | 435,414 | Form 4 |
| 2026-08-04 | Schafer Douglas M. JR | S (D) | 48,000 | $45.71 | 387,414 | Form 4 |
| 2026-08-04 | Gallagher Thomas P. | M (A) | 48,334 | $12 | 1,771,609 | Form 4 |
| 2026-08-04 | Gallagher Thomas P. | S (D) | 48,334 | $45.69 | 1,723,275 | Form 4 |
| 2026-08-04 | Jayabalan Harish | M (A) | 14,168 | $12 | 92,233 | Form 4 |
| 2026-08-04 | Jayabalan Harish | S (D) | 20,000 | $45.9 | 78,065 | Form 4 |
| 2026-08-04 | Jayabalan Harish | M (A) | 5,832 | $15.22 | 98,065 | Form 4 |
| 2026-08-04 | Deitzel Edward | S (D) | 11,000 | $45.78 | 119,601 | Form 4 |
| 2026-08-04 | Deitzel Edward | M (A) | 11,000 | $12 | 130,601 | Form 4 |
| 2026-08-04 | Eckert Kurt M. | M (A) | 1,063 | $12 | 150,675 | Form 4 |
| 2026-08-04 | Eckert Kurt M. | S (D) | 1,063 | $45.8 | 149,612 | Form 4 |
| 2026-08-04 | Comly Barbara J. | M (A) | 44,445 | $12 | 927,429 | Form 4 |
| 2026-08-04 | Comly Barbara J. | S (D) | 44,445 | $45.69 | 882,984 | Form 4 |
| 2026-07-15 | Schwarzkopf Cynthia | M (A) | 5,000 | $12 | 93,545 | Form 4 |
| 2026-07-15 | Schwarzkopf Cynthia | S (D) | 5,000 | $42 | 88,545 | Form 4 |
| 2026-07-13 | Gallagher Thomas P. | M (A) | 70,000 | $12 | 1,793,275 | Form 4 |
| 2026-07-13 | Gallagher Thomas P. | S (D) | 70,000 | $42.52 | 1,723,275 | Form 4 |
| 2026-07-13 | Comly Barbara J. | M (A) | 28,000 | $12 | 910,984 | Form 4 |
| 2026-07-13 | Comly Barbara J. | S (D) | 28,000 | $41.98 | 882,984 | Form 4 |
| 2026-07-08 | Brown David A | F (D) | 171 | $43.72 | 7,066 | Form 4 |
| 2026-07-07 | Gallagher Thomas P. | M (A) | 28,228 | $12 | 1,751,503 | Form 4 |
| 2026-07-07 | Gallagher Thomas P. | S (D) | 28,228 | $42.27 | 1,723,275 | Form 4 |
| 2026-07-06 | Brown Shelly | S (D) | 16,000 | $42.13 | 353,990 | Form 4 |
| 2026-07-06 | Brown Shelly | M (A) | 16,000 | $12 | 369,990 | Form 4 |
| 2026-07-06 | Deitzel Edward | M (A) | 7,333 | $12 | 126,934 | Form 4 |
| 2026-07-06 | Deitzel Edward | S (D) | 11,000 | $42.04 | 119,601 | Form 4 |
| 2026-07-06 | Deitzel Edward | M (A) | 3,667 | $12 | 130,601 | Form 4 |
| 2026-07-06 | Jayabalan Harish | M (A) | 834 | $12 | 78,899 | Form 4 |
| 2026-07-06 | Jayabalan Harish | S (D) | 20,000 | $42.12 | 78,065 | Form 4 |
| 2026-07-06 | Jayabalan Harish | M (A) | 2,499 | $12 | 98,065 | Form 4 |
| 2026-07-06 | Jayabalan Harish | M (A) | 16,667 | $12 | 95,566 | Form 4 |
| 2026-07-06 | Gallagher Thomas P. | S (D) | 41,772 | $42.09 | 1,723,275 | Form 4 |
| 2026-07-06 | Gallagher Thomas P. | M (A) | 41,772 | $12 | 1,765,047 | Form 4 |
| 2026-07-02 | Schafer Douglas M. JR | M (A) | 6,000 | $12 | 393,414 | Form 4 |
| 2026-07-02 | Schafer Douglas M. JR | M (A) | 42,000 | $12 | 435,414 | Form 4 |
| 2026-07-02 | Schafer Douglas M. JR | S (D) | 48,000 | $41.22 | 387,414 | Form 4 |
| 2026-07-02 | Comly Barbara J. | M (A) | 28,000 | $12 | 910,984 | Form 4 |
| 2026-07-02 | Comly Barbara J. | S (D) | 28,000 | $41.22 | 882,984 | Form 4 |
| 2026-07-02 | Eckert Kurt M. | M (A) | 5,250 | $12 | 154,862 | Form 4 |
| 2026-07-02 | Eckert Kurt M. | S (D) | 5,250 | $39.35 | 149,612 | Form 4 |
| 2026-07-02 | Teekell Judson Gray | S (D) | 3,000 | $40 | 75,251 | Form 4 |
Transaction codes in this quarter
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Questions
Are insiders buying or selling Miami International Holdings, Inc. (MIAX)?
In Q3 2026, insiders at Miami International Holdings, Inc. reported 66 non-derivative transactions on 31 Forms 3, 4 and 5: 0 open-market purchases and 29 sales worth $36.0M. Grants, tax withholding and option exercises are counted as transactions but are not purchases or sales.
Where do these Miami International Holdings, Inc. insider trades come from?
From the SEC Insider Transactions Data Sets for Q3 2026, which republish the Forms 3, 4 and 5 filed on EDGAR. Each row links to its filing on SEC.gov.
Source: SEC Insider Transactions Data Sets, Q3 2026, retrieved 2026-10-27. Footnotes, derivative holdings and amendments are in the linked filings. Not investment advice.
Plain-text version for agents and LLMs: /insider-trading/miax.md
Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.