MURRAY STAHL - 02 Mar 2026 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Role
Director
Signature
/s/Jay Kesslen, attorney-in-fact
Issuer symbol
MIAX
Transactions as of
02 Mar 2026
Net transactions value
-$4,953,530
Form type
4
Filing time
04 Mar 2026, 15:22:29 UTC
Previous filing
02 Mar 2026
Next filing
04 Mar 2026
SEC
View on sec.gov

Reporting Owners (2)

Name Relationship Address Signature Signature date CIK
STAHL MURRAY Director 470 PARK AVE S, 8TH FLOOR SOUTH, NEW YORK /s/Jay Kesslen, attorney-in-fact 03 Mar 2026 0001207097
HORIZON KINETICS ASSET MANAGEMENT LLC 10%+ Owner 470 PARK AVE S, 8TH FLOOR SOUTH, NEW YORK /s/Jay Kesslen, attorney-in-fact 03 Mar 2026 0001056823
This filing has been restated, see here for the amended filing

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Exercise of in-the-money or at-the-money derivative security +21,290 +0.47% $15.00* 4,581,654 02 Mar 2026 Horizon Kinetics Asset Management LLC F1
transaction MIAX Common Stock Exercise of in-the-money or at-the-money derivative security +91,366 +2% $20.50* 4,673,020 02 Mar 2026 Horizon Kinetics Asset Management LLC F1
transaction MIAX Common Stock Exercise of in-the-money or at-the-money derivative security +137,500 +2.9% $20.00* 4,810,520 02 Mar 2026 Horizon Kinetics Asset Management LLC F1
transaction MIAX Common Stock Sale $4,953,530 -121,054 -2.5% $40.92 4,689,466 02 Mar 2026 Horizon Kinetics Asset Management LLC F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction MIAX Warrant (right to buy) Exercise of in-the-money or at-the-money derivative security -21,290 -100% $0.000000* 0 02 Mar 2026 Common Stock 21,290 $15.00 Horizon Kinetics Asset Management LLC
transaction MIAX Warrant (right to buy) Exercise of in-the-money or at-the-money derivative security -24,878 -100% $0.000000* 0 02 Mar 2026 Common Stock 24,878 $20.50 Horizon Kinetics Asset Management LLC
transaction MIAX Warrant (right to buy) Exercise of in-the-money or at-the-money derivative security -27,561 -100% $0.000000* 0 02 Mar 2026 Common Stock 27,561 $20.50 Horizon Kinetics Asset Management LLC
transaction MIAX Warrant (right to buy) Exercise of in-the-money or at-the-money derivative security -38,927 -100% $0.000000* 0 02 Mar 2026 Common Stock 38,927 $20.50 Horizon Kinetics Asset Management LLC
transaction MIAX Warrant (right to buy) Exercise of in-the-money or at-the-money derivative security -137,500 -100% $0.000000* 0 02 Mar 2026 Common Stock 137,500 $20.00 Horizon Kinetics Asset Management LLC
holding MIAX Options 7,500 02 Mar 2026 Miami International Holdings Inc 7,500 $16.14 Direct F2
holding MIAX Options 10,000 02 Mar 2026 Miami International Holdings Inc 10,000 $25.98 Direct F2
holding MIAX Options 14,331 02 Mar 2026 Miami International Holdings Inc 14,331 $19.84 Direct F2
holding MIAX Options 2,500 02 Mar 2026 Miami International Holdings Inc 2,500 $16.14 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Horizon Kinetics Asset Management LLC (HKAM) exercised warrants to purchase 341,522 shares of common stock at the exercise prices noted. HKAM paid the exercise price on a cashless basis, resulting in the Issuer withholding 121,054 of the warrant shares to pay the exercise price and issuing to HKAM the remaining 129,102 shares.
F2 The Options given to Mr. Stahl are fully vested.