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MIAMI INTERNATIONAL HOLDINGS, INC.

MIAX Mostly scheduled
CIK 0001438472 #1507 in the set updated 21 Sep 2026
Bought (120 mo)
$2.83M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$77.99M
$12.80M on a plan · $65.18M straight out of an exercise
Sold at will
$12.00K
1 of 65 sales
Net
−$75.16M
+$2.82M against sales at will

By person

26 insiders · 110 transactions
56.1×

Thomas P. Gallagher holds 56.1 times base salary in stock. $140.27M of shares against $2.50M in salary for 2025.

Salary from the company's own proxy. The shares are what Thomas P. Gallagher last reported holding, valued at $38.61, the price Common Stock was last bought or sold at on the open market here, on 16 Sep 2026.

Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
Gallagher Thomas P.
Chairman & CEO
$276.00K (1)
$32.30M (12) scheduled
−$32.03M
3,633,092
3.66%
$140.27M
+9.1%
Schafer Douglas M. JR
EVP and CIO
—
$12.35M (6) scheduled
−$12.35M
387,414
0.3904%
$14.96M
+158.3%
Comly Barbara J.
EVP, GC & Corporate Secretary
—
$9.98M (7) scheduled
−$9.98M
839,564
0.8461%
$32.42M
−3.4%
Brown Shelly
EVP, Chief Strategy Officer
—
$4.98M (9) scheduled
−$4.98M
316,490
0.3189%
$12.22M
+127.8%
Emmons Lance
EVP and CFO
$125.76 (1)
$3.47M (2) scheduled
−$3.47M
86,542
0.0872%
$3.34M
+137.0%
STAHL MURRAY
Director
$1.97M (6)
$4.95M (1) scheduled
−$2.99M
4,633,842
4.67%
$178.91M
+4.1%
Deitzel Edward
EVP, CRO, CCO MIAX Exchanges
$2.30K (1)
$2.93M (8) scheduled
−$2.93M
119,601
0.1205%
$4.62M
+272.7%
Jayabalan Harish
EVP, CISO and CRO
$57.50K (1)
$2.56M (4) scheduled
−$2.50M
78,065
0.0787%
$3.01M
+1,880%
Eckert Kurt M.
Director
—
$2.22M (5) scheduled
−$2.22M
149,612
0.1508%
$5.78M
+24.2%
Schwarzkopf Cynthia
Director
—
$1.24M (3) scheduled
−$1.24M
88,545
0.0892%
$3.42M
—
Teekell Judson Gray
Director
—
$1.00M (8) scheduled
−$1.00M
236,796
0.2386%
$9.14M
+123.3%
Massad Mark I.
Director
$184.00K (4)
—
+$184.00K
11,237
0.0113%
$433.86K
—
Moore Lisa
Director
$126.50K (1)
—
+$126.50K
12,737
0.0128%
$491.78K
—
Smollen John
EVP, New Product Development
$115.00K (1)
—
+$115.00K
269,878
0.2720%
$10.42M
—
Nazarali Jamil
Director
$57.50K (1)
—
+$57.50K
2,500
0.0025%
$96.53K
—
Lozier Kenneth W.
Director
$23.00K (1)
—
+$23.00K
8,237
0.0083%
$318.03K
—
Stahlin Paul
Director
$23.00K (1)
—
+$23.00K
42,143
0.0425%
$1.63M
—
Al-Bahar Talal Jassim
Director
—
—
—
3,658,187
3.69%
$141.24M
+7.2%
HORIZON KINETICS ASSET MANAGEMENT LLC entity
10% owner
—
—
—
2,170,898
2.19%
$83.82M
−53.1%
Raymond Mark F.
Director
—
—
—
67,064
0.0676%
$2.59M
—
Beckelman John
Director
—
—
—
15,904
0.0160%
$614.05K
—
BROWN DAVID A
Director
—
—
—
7,066
0.0071%
$272.82K
—
Sommers Jill E.
Director
—
—
—
6,083
0.0061%
$234.86K
—
Sites Eric
Director
—
—
—
5,684
0.0057%
$219.46K
—
Vermaas Cees
CEO of TISEG
—
—
—
4,660
0.0047%
$179.92K
—
Becker Lee
Director
—
—
—
2,267
0.0023%
$87.53K
—

Individual transactions

110
Insider
Date
Role
Action
Shares
Price
Amount
Brown Shelly
16 Sep 2026
EVP, Chief Strategy Officer
Sold on a plan
21,217
$38.61
$819.19K
Deitzel Edward
3 Sep 2026
EVP, CRO, CCO MIAX Exchanges
Sold after exercise
11,000
$42.21
$464.31K
Gallagher Thomas P.
3 Sep 2026
Chairman & CEO
Sold after exercise indirect
47,000
$42.43
$1.99M
Teekell Judson Gray
2 Sep 2026
Director
Sold on a plan
3,000
$40.89
$122.67K
Teekell Judson Gray
2 Sep 2026
Director
Sold on a plan indirect
5,545
$41.58
$230.56K
Schafer Douglas M. JR
2 Sep 2026
EVP and CIO
Sold after exercise
48,000
$40.48
$1.94M
Comly Barbara J.
2 Sep 2026
EVP, GC & Corporate Secretary
Sold after exercise
44,445
$40.49
$1.80M
Gallagher Thomas P.
19 Aug 2026
Chairman & CEO
Sold on a plan indirect
149,700
$41.13
$6.16M
Emmons Lance
17 Aug 2026
EVP and CFO
Sold on a plan
35,000
$42.83
$1.50M
Schwarzkopf Cynthia
17 Aug 2026
Director
Sold after exercise
5,000
$42.85
$214.25K
Gallagher Thomas P.
4 Aug 2026
Chairman & CEO
Sold after exercise indirect
48,334
$45.69
$2.21M
Schafer Douglas M. JR
4 Aug 2026
EVP and CIO
Sold after exercise
48,000
$45.71
$2.19M
Deitzel Edward
4 Aug 2026
EVP, CRO, CCO MIAX Exchanges
Sold after exercise
11,000
$45.78
$503.58K
Comly Barbara J.
4 Aug 2026
EVP, GC & Corporate Secretary
Sold after exercise
44,445
$45.69
$2.03M
Jayabalan Harish
4 Aug 2026
EVP, CISO and CRO
Sold after exercise
20,000
$45.90
$918.00K
Teekell Judson Gray
4 Aug 2026
Director
Sold on a plan
3,000
$45.79
$137.37K
Eckert Kurt M.
4 Aug 2026
Director
Sold after exercise
1,063
$45.80
$48.69K
Schwarzkopf Cynthia
15 Jul 2026
Director
Sold after exercise
5,000
$42.00
$210.00K
Gallagher Thomas P.
13 Jul 2026
Chairman & CEO
Sold after exercise indirect
70,000
$42.52
$2.98M
Comly Barbara J.
13 Jul 2026
EVP, GC & Corporate Secretary
Sold after exercise
28,000
$41.98
$1.18M
Gallagher Thomas P.
7 Jul 2026
Chairman & CEO
Sold after exercise indirect
28,228
$42.27
$1.19M
Brown Shelly
6 Jul 2026
EVP, Chief Strategy Officer
Sold after exercise
16,000
$42.13
$674.08K
Deitzel Edward
6 Jul 2026
EVP, CRO, CCO MIAX Exchanges
Sold after exercise
11,000
$42.04
$462.44K
Jayabalan Harish
6 Jul 2026
EVP, CISO and CRO
Sold after exercise
20,000
$42.12
$842.40K
Gallagher Thomas P.
6 Jul 2026
Chairman & CEO
Sold after exercise indirect
41,772
$42.09
$1.76M
Schafer Douglas M. JR
2 Jul 2026
EVP and CIO
Sold after exercise
48,000
$41.22
$1.98M
Comly Barbara J.
2 Jul 2026
EVP, GC & Corporate Secretary
Sold after exercise
28,000
$41.22
$1.15M
Eckert Kurt M.
2 Jul 2026
Director
Sold after exercise
5,250
$39.35
$206.59K
Teekell Judson Gray
2 Jul 2026
Director
Sold on a plan
3,000
$40.00
$120.00K
Raymond Mark F.
16 Jun 2026
Director
Exercised, kept
16,000
$12.00
$192.00K
Brown Shelly
15 Jun 2026
EVP, Chief Strategy Officer
Sold on a plan
4,714
$44.23
$208.50K
Stahlin Paul
11 Jun 2026
Director
Exercised, kept
4,000
$12.00
$48.00K
Schwarzkopf Cynthia
11 Jun 2026
Director
Sold after exercise
19,500
$41.73
$813.74K
Jayabalan Harish
9 Jun 2026
EVP, CISO and CRO
Sold after exercise
9,783
$40.04
$391.71K
Stahlin Paul
9 Jun 2026
Director
Exercised, kept
7,000
$12.00
$84.00K
Jayabalan Harish
8 Jun 2026
EVP, CISO and CRO
Sold after exercise
10,217
$40.12
$409.91K
Gallagher Thomas P.
2 Jun 2026
Chairman & CEO
Sold after exercise indirect
70,000
$42.36
$2.97M
Brown Shelly
2 Jun 2026
EVP, Chief Strategy Officer
Sold after exercise
16,000
$42.12
$673.92K
Schafer Douglas M. JR
2 Jun 2026
EVP and CIO
Sold after exercise
48,000
$42.84
$2.06M
Deitzel Edward
2 Jun 2026
EVP, CRO, CCO MIAX Exchanges
Sold after exercise
11,000
$42.16
$463.76K
Comly Barbara J.
2 Jun 2026
EVP, GC & Corporate Secretary
Sold after exercise
28,000
$42.85
$1.20M
Eckert Kurt M.
2 Jun 2026
Director
Sold after exercise
5,250
$42.76
$224.49K
Teekell Judson Gray
2 Jun 2026
Director
Sold on a plan
3,000
$42.78
$128.34K
Teekell Judson Gray
19 May 2026
Director
Exercised, kept
22,667
$12.00
$272.00K
Emmons Lance
15 May 2026
EVP and CFO
Sold on a plan
35,000
$56.36
$1.97M
Gallagher Thomas P.
11 May 2026
Chairman & CEO
Exercised, kept
24,999
$12.00
$299.99K
Gallagher Thomas P.
5 May 2026
Chairman & CEO
Sold after exercise indirect
15,771
$47.92
$755.75K
Comly Barbara J.
4 May 2026
EVP, GC & Corporate Secretary
Sold after exercise
28,000
$47.26
$1.32M
Eckert Kurt M.
4 May 2026
Director
Sold after exercise
5,625
$47.29
$266.01K
Schafer Douglas M. JR
4 May 2026
EVP and CIO
Sold after exercise
48,000
$47.25
$2.27M
Teekell Judson Gray
4 May 2026
Director
Sold on a plan
3,000
$47.30
$141.90K
Brown Shelly
4 May 2026
EVP, Chief Strategy Officer
Sold after exercise
16,000
$47.28
$756.48K
Deitzel Edward
4 May 2026
EVP, CRO, CCO MIAX Exchanges
Sold after exercise
11,000
$47.28
$520.08K
Gallagher Thomas P.
4 May 2026
Chairman & CEO
Sold after exercise indirect
54,229
$47.26
$2.56M
Comly Barbara J.
15 Apr 2026
EVP, GC & Corporate Secretary
Sold after exercise
29,667
$43.64
$1.29M
Gallagher Thomas P.
15 Apr 2026
Chairman & CEO
Sold after exercise
49,900
$43.68
$2.18M
Gallagher Thomas P.
15 Apr 2026
Chairman & CEO
Sold after exercise indirect
104,124
$43.36
$4.51M
Gallagher Thomas P.
15 Apr 2026
Chairman & CEO
Sold after exercise indirect
70,001
$43.36
$3.04M
Beckelman John
9 Apr 2026
Director
Exercised, kept
8,667
$12.00
$104.00K
Deitzel Edward
8 Apr 2026
EVP, CRO, CCO MIAX Exchanges
Sold after exercise
7,572
$42.02
$318.18K
Brown Shelly
8 Apr 2026
EVP, Chief Strategy Officer
Sold after exercise
16,434
$42.08
$691.54K
Brown Shelly
7 Apr 2026
EVP, Chief Strategy Officer
Sold on a plan
900
$42.00
$37.80K
Deitzel Edward
7 Apr 2026
EVP, CRO, CCO MIAX Exchanges
Sold after exercise
4,001
$42.00
$168.04K
Deitzel Edward
7 Apr 2026
EVP, CRO, CCO MIAX Exchanges
Sold after exercise
762
$42.00
$32.00K
Brown Shelly
6 Apr 2026
EVP, Chief Strategy Officer
Sold on a plan
2,357
$41.33
$97.41K
Teekell Judson Gray
2 Apr 2026
Director
Sold on a plan
2,700
$40.00
$108.00K
Brown Shelly
30 Mar 2026
EVP, Chief Strategy Officer
Exercised, kept
5,040
$19.84
$99.99K
Brown Shelly
30 Mar 2026
EVP, Chief Strategy Officer
Exercised, kept
3,878
$25.78
$99.97K
Brown Shelly
30 Mar 2026
EVP, Chief Strategy Officer
Exercised, kept
6,195
$16.14
$99.99K
Brown Shelly
30 Mar 2026
EVP, Chief Strategy Officer
Exercised, kept
6,570
$15.22
$100.00K
Brown Shelly
30 Mar 2026
EVP, Chief Strategy Officer
Exercised, kept
8,333
$12.00
$100.00K
Teekell Judson Gray
25 Mar 2026
Director
Sell
300
$40.00
$12.00K
Brown Shelly
23 Mar 2026
EVP, Chief Strategy Officer
Sold on a plan
25,932
$39.33
$1.02M
Eckert Kurt M.
19 Mar 2026
Director
Sold after exercise
37,917
$39.00
$1.48M
Schafer Douglas M. JR
17 Mar 2026
EVP and CIO
Sold after exercise
48,000
$39.74
$1.91M
Comly Barbara J.
9 Mar 2026
EVP, GC & Corporate Secretary
Exercised, kept
16,666
$12.00
$199.99K
Comly Barbara J.
9 Mar 2026
EVP, GC & Corporate Secretary
Exercised, kept
8,333
$12.00
$100.00K
Comly Barbara J.
9 Mar 2026
EVP, GC & Corporate Secretary
Exercised, kept
8,333
$12.00
$100.00K
STAHL MURRAY
5 Mar 2026
Director
Buy indirect
7,200
$43.08
$310.18K
STAHL MURRAY
4 Mar 2026
Director
Buy indirect
7,200
$43.38
$312.34K
STAHL MURRAY
2 Mar 2026
Director
Sold after exercise indirect
121,054
$40.92
$4.95M
Emmons Lance
16 Dec 2025
EVP and CFO
Exercised, kept
5,040
$19.84
$99.99K
Emmons Lance
16 Dec 2025
EVP and CFO
Exercised, kept
6,195
$16.14
$99.99K
Emmons Lance
16 Dec 2025
EVP and CFO
Exercised, kept
22,221
$13.50
$299.98K
Brown Shelly
16 Dec 2025
EVP, Chief Strategy Officer
Exercised, kept
8,333
$12.00
$100.00K
Brown Shelly
16 Dec 2025
EVP, Chief Strategy Officer
Exercised, kept
8,333
$12.00
$100.00K
Brown Shelly
16 Dec 2025
EVP, Chief Strategy Officer
Exercised, kept
16,666
$12.00
$199.99K
STAHL MURRAY
12 Dec 2025
Director
Buy indirect
2,439
$41.00
$100.00K
STAHL MURRAY
3 Oct 2025
Director
Buy indirect
2
$41.97
$83.94
STAHL MURRAY
26 Sep 2025
Director
Buy indirect
4
$41.76
$167.04
Deitzel Edward
11 Sep 2025
EVP, CRO, CCO MIAX Exchanges
Exercised, kept
16,666
$12.00
$199.99K
Smollen John
11 Sep 2025
EVP Traded Products & Relation
Exercised, kept
24,999
$12.00
$299.99K
Smollen John
11 Sep 2025
EVP Traded Products & Relation
Exercised, kept
125,001
$12.00
$1.50M
Jayabalan Harish
9 Sep 2025
EVP, CISO and CRO
Exercised, kept
3,001
$12.00
$36.01K
Jayabalan Harish
9 Sep 2025
EVP, CISO and CRO
Exercised, kept
21,999
$12.00
$263.99K
Deitzel Edward
9 Sep 2025
EVP, CRO, CCO MIAX Exchanges
Exercised, kept
62,500
$12.00
$750.00K
STAHL MURRAY
28 Aug 2025
Director
Buy indirect
34,470
$36.10
$1.24M
Emmons Lance
14 Aug 2025
EVP and CFO
Buy indirect
4
$31.44
$125.76
Massad Mark I.
13 Aug 2025
Director
Buy indirect
500
$23.00
$11.50K
Massad Mark I.
13 Aug 2025
Director
Buy indirect
1,500
$23.00
$34.50K
Massad Mark I.
13 Aug 2025
Director
Buy indirect
2,500
$23.00
$57.50K
Massad Mark I.
13 Aug 2025
Director
Buy
3,500
$23.00
$80.50K
Lozier Kenneth W.
13 Aug 2025
Director
Buy
1,000
$23.00
$23.00K
Gallagher Thomas P.
13 Aug 2025
Chairman & CEO
Buy
12,000
$23.00
$276.00K
Deitzel Edward
13 Aug 2025
EVP, CRO, CCO MIAX Exchanges
Buy
100
$23.00
$2.30K
Smollen John
13 Aug 2025
EVP Traded Products & Relation
Buy
5,000
$23.00
$115.00K
Nazarali Jamil
13 Aug 2025
Director
Buy
2,500
$23.00
$57.50K
Stahlin Paul
13 Aug 2025
Director
Buy
1,000
$23.00
$23.00K
Jayabalan Harish
13 Aug 2025
EVP, CISO and CRO
Buy
2,500
$23.00
$57.50K
Moore Lisa
13 Aug 2025
Director
Buy
5,500
$23.00
$126.50K

What was left out

Form 4 filings counted 146
Amendments (4/A) skipped 3
Filings about a different issuer 0
Unreadable filings 0
Joint filings 7
Sales on a Rule 10b5-1 plan 15
Sales straight out of an exercise 49
Sales at will 1
Transactions with no price 0
Shares from compensation/vesting 8,441,818
History held since 15 Aug 2025