MIAMI INTERNATIONAL HOLDINGS, INC.

MIAX

Form 4 • Statement of Changes in Beneficial Ownership

SEC Accession Number: 0001437749-26-006880
Filing date: Mar 4, 2026
Earliest execution date: Mar 2, 2026

Summary

Type

Sell

Net shares

-121,054

% of shares

-2.52%

Amount (USD)

$4,953,529

Insider confidence score

17.5 out of 100

Negative

  • Large discretionary sell (≥1% of shares)
  • Very large sell amount ($1M+)

Stock transactions

Transaction 1

Security

Common Stock

Action

Exercise

Date

2026-03-02

Code

X

Net shares

+21,290.0

Price per Share

$15.00

Amount (USD)

$319,350.00

Acquired/Disposed

Acquired

Shares Owned Before

4,560,364.0

Shares Owned After

4,581,654.0

Transaction 2

Security

Common Stock

Action

Exercise

Date

2026-03-02

Code

X

Net shares

+91,366.0

Price per Share

$20.50

Amount (USD)

$1,873,003.00

Acquired/Disposed

Acquired

Shares Owned Before

4,581,654.0

Shares Owned After

4,673,020.0

Transaction 3

Security

Common Stock

Action

Exercise

Date

2026-03-02

Code

X

Net shares

+137,500.0

Price per Share

$20.00

Amount (USD)

$2,750,000.00

Acquired/Disposed

Acquired

Shares Owned Before

4,673,020.0

Shares Owned After

4,810,520.0

Transaction 4

Security

Common Stock

Action

Sell

Date

2026-03-02

Code

S

Net shares

-121,054.0

Price per Share

$40.92

Amount (USD)

$4,953,529.68

Acquired/Disposed

Disposed

Shares Owned Before

4,810,520.0

Shares Owned After

4,689,466.0

Derivative Transactions

Transaction 1

Security

Warrant (right to buy)

Action

Exercise

Date

2026-03-02

Code

X

Net shares

-21,290.0

Acquired/Disposed

Disposed

Shares Owned Before

21,290.0

Shares Owned After

0.0

Transaction 2

Security

Warrant (right to buy)

Action

Exercise

Date

2026-03-02

Code

X

Net shares

-24,878.0

Acquired/Disposed

Disposed

Shares Owned Before

24,878.0

Shares Owned After

0.0

Transaction 3

Security

Warrant (right to buy)

Action

Exercise

Date

2026-03-02

Code

X

Net shares

-27,561.0

Acquired/Disposed

Disposed

Shares Owned Before

27,561.0

Shares Owned After

0.0

Transaction 4

Security

Warrant (right to buy)

Action

Exercise

Date

2026-03-02

Code

X

Net shares

-38,927.0

Acquired/Disposed

Disposed

Shares Owned Before

38,927.0

Shares Owned After

0.0

Transaction 5

Security

Warrant (right to buy)

Action

Exercise

Date

2026-03-02

Code

X

Net shares

-137,500.0

Acquired/Disposed

Disposed

Shares Owned Before

137,500.0

Shares Owned After

0.0

Filing's footnotes

1. 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.

2. The Options given to Mr. Stahl are fully vested.

This page is for informational purposes only. While we strive for accuracy, the summary may contain inaccuracies or omissions. Please refer to the official SEC filing for authoritative information. Open the SEC filing.