MIAX
MIAMI INTL (MIAX)
NYSE
$42.58-$0.02 (-0.04%)
Price as of Aug 21, 2026 7:30 PM EDT
  • $4.2B
    Market Cap
  • 27.06%
    1-Year Change
  • Capital Markets
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
HORIZON KINETICS ASSET MANAGEMENT LLC
8.10%
7.8M
+4.4M (+55.99%)
Jun 30, 2026
BLACKROCK, INC.
5.24%
5.1M
+2.8M (+55.98%)
Jun 30, 2026
T. ROWE PRICE INVESTMENT MANAGEMENT, INC.
5.20%
5.0M
+887,352 (+17.63%)
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
3.91%
3.8M
+2.4M (+63.69%)
Jun 30, 2026
N/A
3.91%
3.8M
+2.4M (+63.69%)
Jun 30, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP
3.47%
3.4M
+58,697 (+1.75%)
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
3.27%
3.2M
+1.8M (+55.30%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions184.4M (83.58%)
  • Mutual Funds25.4M (11.52%)
  • Insiders10.8M (4.90%)
  • Other0 (0.00%)

Insider Transactions

  • 4.90% (10.8M)
    Current InsiderOwnership (%, shares)
  • 1
    Number of InsiderBuying (last 12 months)
  • $581.0M
    Amount of InsiderBuying (last 12 months)
  • 11
    Number of InsiderSelling (last 12 months)
  • $517.9M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Gallagher Thomas P.
Chairman & CEO
Sell
Aug 19, 2026
$6.2M
149,700
$41.13
1.4M
Comly Barbara J.
EVP, GC & Corporate Secretary
In Kind
Aug 18, 2026
$1.8M
43,420
$42.41
839,564
Gallagher Thomas P.
Chairman & CEO
In Kind
Aug 18, 2026
$6.4M
150,300
$42.41
1.6M
Emmons Lance
EVP and CFO
Sell
Aug 17, 2026
$1.5M
35,000
$42.83
86,538
Teekell Judson Gray
Sell
Aug 04, 2026
$137,370.00
3,000
$45.79
72,251
Deitzel Edward
EVP, CRO, CCO MIAX Exchanges
Exempt
Aug 04, 2026
$0.00
11,000
$0.00
77,000
Schafer Douglas M. JR
EVP and CIO
Exempt
Aug 04, 2026
$0.00
48,000
$0.00
43,334
Eckert Kurt M.
Exempt
Aug 04, 2026
$0.00
1,063
$0.00
0
Schafer Douglas M. JR
EVP and CIO
Exempt
Aug 04, 2026
$576,000.00
48,000
$12.00
435,414
Deitzel Edward
EVP, CRO, CCO MIAX Exchanges
Exempt
Aug 04, 2026
$132,000.00
11,000
$12.00
130,601
Schafer Douglas M. JR
EVP and CIO
Sell
Aug 04, 2026
$2.2M
48,000
$45.71
387,414
Jayabalan Harish
EVP, CISO and CRO
Exempt
Aug 04, 2026
$0.00
14,168
$0.00
0
Comly Barbara J.
EVP, GC & Corporate Secretary
Exempt
Aug 04, 2026
$0.00
44,445
$0.00
88,889
Deitzel Edward
EVP, CRO, CCO MIAX Exchanges
Sell
Aug 04, 2026
$503,580.00
11,000
$45.78
119,601
Comly Barbara J.
EVP, GC & Corporate Secretary
Exempt
Aug 04, 2026
$533,340.00
44,445
$12.00
927,429
Eckert Kurt M.
Exempt
Aug 04, 2026
$12,756.00
1,063
$12.00
150,675
Comly Barbara J.
EVP, GC & Corporate Secretary
Sell
Aug 04, 2026
$2.0M
44,445
$45.69
882,984
Jayabalan Harish
EVP, CISO and CRO
Exempt
Aug 04, 2026
$0.00
5,832
$0.00
17,598
Eckert Kurt M.
Sell
Aug 04, 2026
$48,685.40
1,063
$45.80
149,612
Jayabalan Harish
EVP, CISO and CRO
Exempt
Aug 04, 2026
$170,016.00
14,168
$12.00
92,233
Jayabalan Harish
EVP, CISO and CRO
Exempt
Aug 04, 2026
$88,763.04
5,832
$15.22
98,065
Jayabalan Harish
EVP, CISO and CRO
Sell
Aug 04, 2026
$918,000.00
20,000
$45.90
78,065
Schwarzkopf Cynthia
Exempt
Jul 15, 2026
$0.00
5,000
$0.00
16,916
Schwarzkopf Cynthia
Exempt
Jul 15, 2026
$60,000.00
5,000
$12.00
93,545
Schwarzkopf Cynthia
Sell
Jul 15, 2026
$210,000.00
5,000
$42.00
88,545
Comly Barbara J.
EVP, GC & Corporate Secretary
Exempt
Jul 13, 2026
$0.00
28,000
$0.00
0
Gallagher Thomas P.
Chairman & CEO
Exempt
Jul 13, 2026
$0.00
70,000
$0.00
0
Comly Barbara J.
EVP, GC & Corporate Secretary
Exempt
Jul 13, 2026
$336,000.00
28,000
$12.00
910,984
Gallagher Thomas P.
Chairman & CEO
Exempt
Jul 13, 2026
$840,000.00
70,000
$12.00
1.8M
Comly Barbara J.
EVP, GC & Corporate Secretary
Sell
Jul 13, 2026
$1.2M
28,000
$41.98
882,984