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MIAMI INTERNATIONAL HOLDINGS, INC.

MIAX Mostly scheduled
CIK 0001438472 #1507 in the set updated 17 Sep 2026
Bought (120 mo)
$2.83M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$77.17M
$11.98M on a plan · $65.18M straight out of an exercise
Sold at will
$12.00K
1 of 64 sales
Net
−$74.34M
+$2.82M against sales at will

By person

26 insiders · 109 transactions
61.3×

Thomas P. Gallagher holds 61.3 times base salary in stock. $153.35M 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 $42.21, the price Common Stock was last bought or sold at on the open market here, on 3 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%
$153.35M
+9.1%
Schafer Douglas M. JR
EVP and CIO
—
$12.35M (6) scheduled
−$12.35M
387,414
0.3904%
$16.35M
+158.3%
Comly Barbara J.
EVP, GC & Corporate Secretary
—
$9.98M (7) scheduled
−$9.98M
839,564
0.8461%
$35.44M
−3.4%
Brown Shelly
EVP, Chief Strategy Officer
—
$4.16M (8) scheduled
−$4.16M
337,707
0.3403%
$14.25M
+143.0%
Emmons Lance
EVP and CFO
$125.76 (1)
$3.47M (2) scheduled
−$3.47M
86,542
0.0872%
$3.65M
+137.0%
STAHL MURRAY
Director
$1.97M (6)
$4.95M (1) scheduled
−$2.99M
4,633,842
4.67%
$195.59M
+4.1%
Deitzel Edward
EVP, CRO, CCO MIAX Exchanges
$2.30K (1)
$2.93M (8) scheduled
−$2.93M
119,601
0.1205%
$5.05M
+272.7%
Jayabalan Harish
EVP, CISO and CRO
$57.50K (1)
$2.56M (4) scheduled
−$2.50M
78,065
0.0787%
$3.30M
+1,880%
Eckert Kurt M.
Director
—
$2.22M (5) scheduled
−$2.22M
149,612
0.1508%
$6.32M
+24.2%
Schwarzkopf Cynthia
Director
—
$1.24M (3) scheduled
−$1.24M
88,545
0.0892%
$3.74M
—
Teekell Judson Gray
Director
—
$1.00M (8) scheduled
−$1.00M
236,796
0.2386%
$10.00M
+123.3%
Massad Mark I.
Director
$184.00K (4)
—
+$184.00K
11,237
0.0113%
$474.31K
—
Moore Lisa
Director
$126.50K (1)
—
+$126.50K
12,737
0.0128%
$537.63K
—
Smollen John
EVP, New Product Development
$115.00K (1)
—
+$115.00K
269,878
0.2720%
$11.39M
—
Nazarali Jamil
Director
$57.50K (1)
—
+$57.50K
2,500
0.0025%
$105.53K
—
Lozier Kenneth W.
Director
$23.00K (1)
—
+$23.00K
8,237
0.0083%
$347.68K
—
Stahlin Paul
Director
$23.00K (1)
—
+$23.00K
42,143
0.0425%
$1.78M
—
Al-Bahar Talal Jassim
Director
—
—
—
3,658,187
3.69%
$154.41M
+7.2%
HORIZON KINETICS ASSET MANAGEMENT LLC entity
10% owner
—
—
—
2,170,898
2.19%
$91.63M
−53.1%
Raymond Mark F.
Director
—
—
—
67,064
0.0676%
$2.83M
—
Beckelman John
Director
—
—
—
15,904
0.0160%
$671.31K
—
BROWN DAVID A
Director
—
—
—
7,066
0.0071%
$298.26K
—
Sommers Jill E.
Director
—
—
—
6,083
0.0061%
$256.76K
—
Sites Eric
Director
—
—
—
5,684
0.0057%
$239.92K
—
Vermaas Cees
CEO of TISEG
—
—
—
4,660
0.0047%
$196.70K
—
Becker Lee
Director
—
—
—
2,267
0.0023%
$95.69K
—

Individual transactions

109
Insider
Date
Role
Action
Shares
Price
Amount
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 145
Amendments (4/A) skipped 3
Filings about a different issuer 0
Unreadable filings 0
Joint filings 7
Sales on a Rule 10b5-1 plan 14
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