SCHAFER DOUGLAS M. JR (EVP and CIO) reported 2 transactions at MIAMI INTERNATIONAL HOLDINGS, INC.

Review the transaction codes below to understand the nature of each event.

SCHAFER DOUGLAS M. JR

Filed: 8/19/2025ACC: 0001628280-25-040796

InsiderSCHAFER DOUGLAS M. JRCIK 2079445

→

IssuerMIAMI INTERNATIONAL HOLDINGS, INC.CIK 1438472

Officer· EVP and CIO

Since Feb 2026

0.00

Net shares

Net seller

$0.00

Total acquired

Open market trades

0B · 0S

Total transactions

1.19M acquired · 1.19M disposed

Non-Derivative Transactions2

Common Stock

Direct

C · Conversion

+500.00

Price / share

—

Trade value

—

% of position

0.1%

8/15/2025

537.30K→537.80K

Common Stock

Direct

C · Conversion

+387.30K

Price / share

—

Trade value

—

% of position

257.3%

8/15/2025

150.50K→537.80K

Total

Net shares

+387.80K

Net value

$0.00

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	8/15/2025	C · Conversion	+500.00	—	—	0.1%	537.30K	537.80K
Common Stock Direct	8/15/2025	C · Conversion	+387.30K	—	—	257.3%	150.50K	537.80K
Total			+387.80K		$0.00

Derivative Transactions16

Series B Preferred Stock

Direct

C · Conversion

Converts to

Common Stock

500.00 shares

−500.00

Strike price

Held after

0.00

Exercisable

—

8/15/2025

Nonvoting Common Stock

Direct

C · Conversion

Converts to

Common Stock

387.30K shares

−387.30K

Strike price

Held after

0.00

Exercisable

—

8/15/2025

Incentive Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Nonvoting Common Stock

16.67K shares

−16.67K

Strike price

Held after

0.00

Exercisable

—

8/15/2025

Incentive Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

16.67K shares

+16.67K

Strike price

Held after

16.67K

Exercisable

—

8/15/2025

Incentive Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Nonvoting Common Stock

19.71K shares

−19.71K

Strike price

15.22

Held after

0.00

Exercisable

—

8/15/2025

Incentive Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

19.71K shares

+19.71K

Strike price

15.22

Held after

19.71K

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Nonvoting Common Stock

150K shares

−150K

Strike price

Held after

0.00

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

150K shares

+150K

Strike price

Held after

150K

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Nonvoting Common Stock

133.33K shares

−133.33K

Strike price

Held after

0.00

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

133.33K shares

+133.33K

Strike price

Held after

133.33K

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Nonvoting Common Stock

200K shares

−200K

Strike price

Held after

0.00

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

200K shares

+200K

Strike price

Held after

200K

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Nonvoting Common Stock

130.29K shares

−130.29K

Strike price

15.22

Held after

0.00

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

130.29K shares

+130.29K

Strike price

15.22

Held after

130.29K

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Nonvoting Common Stock

150K shares

−150K

Strike price

16.14

Held after

0.00

Exercisable

—

8/15/2025

Nonqualified Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

150K shares

+150K

Strike price

16.14

Held after

150K

Exercisable

—

8/15/2025

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Series B Preferred Stock Direct	Common Stock500.00 shares	8/15/2025	C · Conversion	−500.00		—	0.00
Nonvoting Common Stock Direct	Common Stock387.30K shares	8/15/2025	C · Conversion	−387.30K		—	0.00
Incentive Stock Option (Right to Buy) Direct	Nonvoting Common Stock16.67K shares	8/15/2025	M · Option Exercise	−16.67K	12	—	0.00
Incentive Stock Option (Right to Buy) Direct	Common Stock16.67K shares	8/15/2025	M · Option Exercise	+16.67K	12	—	16.67K
Incentive Stock Option (Right to Buy) Direct	Nonvoting Common Stock19.71K shares	8/15/2025	M · Option Exercise	−19.71K	15.22	—	0.00
Incentive Stock Option (Right to Buy) Direct	Common Stock19.71K shares	8/15/2025	M · Option Exercise	+19.71K	15.22	—	19.71K
Nonqualified Stock Option (Right to Buy) Direct	Nonvoting Common Stock150K shares	8/15/2025	M · Option Exercise	−150K	12	—	0.00
Nonqualified Stock Option (Right to Buy) Direct	Common Stock150K shares	8/15/2025	M · Option Exercise	+150K	12	—	150K
Nonqualified Stock Option (Right to Buy) Direct	Nonvoting Common Stock133.33K shares	8/15/2025	M · Option Exercise	−133.33K	12	—	0.00
Nonqualified Stock Option (Right to Buy) Direct	Common Stock133.33K shares	8/15/2025	M · Option Exercise	+133.33K	12	—	133.33K
Nonqualified Stock Option (Right to Buy) Direct	Nonvoting Common Stock200K shares	8/15/2025	M · Option Exercise	−200K	12	—	0.00
Nonqualified Stock Option (Right to Buy) Direct	Common Stock200K shares	8/15/2025	M · Option Exercise	+200K	12	—	200K
Nonqualified Stock Option (Right to Buy) Direct	Nonvoting Common Stock130.29K shares	8/15/2025	M · Option Exercise	−130.29K	15.22	—	0.00
Nonqualified Stock Option (Right to Buy) Direct	Common Stock130.29K shares	8/15/2025	M · Option Exercise	+130.29K	15.22	—	130.29K
Nonqualified Stock Option (Right to Buy) Direct	Nonvoting Common Stock150K shares	8/15/2025	M · Option Exercise	−150K	16.14	—	0.00
Nonqualified Stock Option (Right to Buy) Direct	Common Stock150K shares	8/15/2025	M · Option Exercise	+150K	16.14	—	150K