MIAX
MIAMI INTL (MIAX)
NYSE
$34.60+$1.02 (+3.04%)
Price as of Oct 22, 2026 8:00 PM EDT
  • $3.3B
    Market Cap
  • -19.61%
    1-Year Change
  • Capital Markets
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
HORIZON KINETICS ASSET MANAGEMENT LLC
7.90%
7.8M
+4.4M (+55.99%)
Jun 30, 2026
BLACKROCK, INC.
5.11%
5.1M
+2.8M (+55.98%)
Jun 30, 2026
T. ROWE PRICE INVESTMENT MANAGEMENT, INC.
5.07%
5.0M
+887,352 (+17.63%)
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
3.82%
3.8M
+2.4M (+63.69%)
Jun 30, 2026
N/A
3.82%
3.8M
+2.4M (+63.69%)
Jun 30, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP
3.38%
3.4M
+58,697 (+1.75%)
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
3.19%
3.2M
+1.8M (+55.30%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions185.1M (74.33%)
  • Mutual Funds53.2M (21.37%)
  • Insiders10.7M (4.30%)
  • Other0 (0.00%)

Insider Transactions

  • 4.30% (10.7M)
    Current InsiderOwnership (%, shares)
  • 1
    Number of InsiderBuying (last 12 months)
  • $199.3M
    Amount of InsiderBuying (last 12 months)
  • 11
    Number of InsiderSelling (last 12 months)
  • $649.8M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Schafer Douglas M. JR
EVP and CIO
Exempt
Oct 02, 2026
$0.00
40,000
$0.00
155,334
Schafer Douglas M. JR
EVP and CIO
Exempt
Oct 02, 2026
$480,000.00
40,000
$12.00
427,414
Schafer Douglas M. JR
EVP and CIO
Sell
Oct 02, 2026
$1.3M
40,000
$33.34
387,414
Jayabalan Harish
EVP, CISO and CRO
Exempt
Sep 25, 2026
$0.00
8,333
$0.00
8,333
Jayabalan Harish
EVP, CISO and CRO
Exempt
Sep 25, 2026
$99,996.00
8,333
$12.00
86,398
Brown Shelly
EVP, Chief Strategy Officer
Sell
Sep 16, 2026
$819,188.37
21,217
$38.61
316,490
Brown Shelly
EVP, Chief Strategy Officer
In Kind
Sep 11, 2026
$692,678.82
16,283
$42.54
337,707
Deitzel Edward
EVP, CRO, CCO MIAX Exchanges
Exempt
Sep 03, 2026
$0.00
11,000
$0.00
66,000
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$0.00
47,000
$0.00
188,000
Deitzel Edward
EVP, CRO, CCO MIAX Exchanges
Exempt
Sep 03, 2026
$132,000.00
11,000
$12.00
130,601
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$0.00
16,666
$0.00
0
Deitzel Edward
EVP, CRO, CCO MIAX Exchanges
Sell
Sep 03, 2026
$464,310.00
11,000
$42.21
119,601
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$0.00
8,333
$0.00
0
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$0.00
13,140
$0.00
0
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$0.00
4,464
$0.00
8,928
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$564,000.00
47,000
$12.00
1.5M
Gallagher Thomas P.
Chairman & CEO
Sell
Sep 03, 2026
$2.0M
47,000
$42.43
1.4M
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$199,992.00
16,666
$12.00
760,605
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$99,996.00
8,333
$12.00
768,938
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$199,990.80
13,140
$15.22
782,078
Gallagher Thomas P.
Chairman & CEO
Exempt
Sep 03, 2026
$99,993.60
4,464
$22.40
786,542
Comly Barbara J.
EVP, GC & Corporate Secretary
Exempt
Sep 02, 2026
$0.00
44,445
$0.00
44,444
Schafer Douglas M. JR
EVP and CIO
Exempt
Sep 02, 2026
$0.00
43,334
$0.00
0
Comly Barbara J.
EVP, GC & Corporate Secretary
Exempt
Sep 02, 2026
$533,340.00
44,445
$12.00
884,009
Schafer Douglas M. JR
EVP and CIO
Exempt
Sep 02, 2026
$0.00
4,666
$0.00
195,334
Comly Barbara J.
EVP, GC & Corporate Secretary
Sell
Sep 02, 2026
$1.8M
44,445
$40.49
839,564
Schafer Douglas M. JR
EVP and CIO
Exempt
Sep 02, 2026
$520,008.00
43,334
$12.00
430,748
Schafer Douglas M. JR
EVP and CIO
Exempt
Sep 02, 2026
$55,992.00
4,666
$12.00
435,414
Schafer Douglas M. JR
EVP and CIO
Sell
Sep 02, 2026
$1.9M
48,000
$40.48
387,414
Gallagher Thomas P.
Chairman & CEO
Sell
Aug 19, 2026
$6.2M
149,700
$41.13
1.4M