Every Form 4 that Miami International Holdings, Inc. (MIAX) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow MIAX and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full MIAX filings page.
Stahlin Paul reported acquisition or exercise transactions in this Form 4 filing.
MIAMI INTERNATIONAL HOLDINGS, INC. director Paul Stahlin reported two equity awards of common stock. He received 4,970 restricted stock units that fully vested on the grant date and 2,267 RSUs that will vest on the last business day before the 2027 annual stockholders’ meeting, subject to continued service. Following these awards, he directly holds 42,143 common shares.
Beckelman John reported acquisition or exercise transactions in this Form 4 filing.
MIAMI INTERNATIONAL HOLDINGS, INC. director John Beckelman reported two equity awards of common stock. On June 15, 2026, he received 2,267 restricted stock units (RSUs) that will vest on the last business day immediately preceding the 2027 annual meeting of stockholders, subject to his continued service. On June 16, 2026, he received 4,970 RSUs that fully vested on the grant date. Each RSU represents one share of common stock, and following these awards he directly holds 15,904 common shares.
MIAMI INTERNATIONAL HOLDINGS, INC. director Judson Gray Teekell reported receiving equity awards in the form of common stock. On June 16, 2026, he acquired 4,970 shares of common stock at a stated price of $0.00 per share through a grant classified as a restricted stock unit (RSU) award that fully vested on the grant date. On June 15, 2026, he received an additional 2,267 RSUs, each representing one share of common stock, which vest on the last business day immediately preceding the 2027 annual meeting of stockholders, subject to his continued service with the company. Following these awards, his directly held common stock position increased to 78,251 shares.
MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert reported equity awards in the form of common stock and stock options. On June 16, 2026, he acquired 4,970 shares of common stock through restricted stock units that fully vested on the grant date.
He also received a nonqualified stock option for 7,713 shares of common stock at an exercise price of $40.2400 per share, vesting in three tranches during 2026. On June 15, 2026, he was granted an additional 2,267 RSUs that will vest immediately before the 2027 annual meeting of stockholders. Following these awards, he directly holds 149,612 shares of common stock and 7,713 option shares.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Shelly Brown, EVP and Chief Strategy Officer, sold 4,714 shares of common stock in an open-market transaction at a weighted average price of $44.23 per share. The sale was made under a previously established Rule 10b5-1 trading plan adopted on December 22, 2025. Following this transaction, Brown directly holds 316,714 shares of MIAX common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. director Eric Sites reported equity compensation awards rather than open‑market trades. He received two grants of common stock classified as awards under code "A": one for 4,970 shares and another for 714 shares, both at a reported price of $0.00 per share. Following one grant, his directly held common stock position is 5,684 shares. Footnotes explain that some restricted stock units vested immediately on the grant date, while others are scheduled to vest on the last business day before the 2027 annual meeting, subject to his continued service. The filing also lists existing fully vested nonqualified stock options, including options over 9,174 shares at an exercise price of $20.00, 9,554 shares at $19.84, and 7,500-share blocks at $25.98 and $16.14, all expiring on March 26, 2030.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Shelly Brown, EVP and Chief Strategy Officer, surrendered 3,619 shares of common stock to the company to cover tax withholding in connection with the net settlement of restricted stock awards. This is a tax-related share disposition, not an open-market sale. After this transaction, Brown directly holds 321,428 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel reported a routine share disposition related to taxes. On this Form 4, 5,939 shares of common stock were surrendered to the company at $40.79 per share to satisfy tax withholding and remittance obligations on restricted stock awards. This transaction is explicitly described as a tax-withholding mechanism and not a sale by the reporting person. After the withholding, Deitzel directly holds 110,282 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Douglas M. Schafer Jr., EVP and CIO, reported a tax-related share disposition. He surrendered 32,565 shares of common stock at $40.79 per share to cover tax withholding and remittance obligations tied to the net settlement of restricted stock awards.
The filing states this was not an open-market sale by the reporting person. After this transaction, he directly holds 364,116 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS director Cynthia Schwarzkopf reported a same-day option exercise and share sale. On June 11, 2026 she exercised options to acquire 19,500 shares of common stock at $12.00 per share, then sold 19,500 shares in an open-market transaction at a weighted average price of $41.73 per share. The sale was executed under a previously established Rule 10b5-1 trading plan, indicating the trades were pre-scheduled. After these transactions, she directly holds 81,308 shares of common stock and no remaining options from this grant, which was fully vested.
MIAMI INTERNATIONAL HOLDINGS director Paul Stahlin exercised stock options and had shares withheld for taxes. He exercised a total of 11,000 stock options at $12.00 per share into common stock on June 9 and June 11, 2026. To cover the option exercise costs and related taxes, 1,177 shares of common stock were withheld by the company, which the filing states does not represent a market sale by Stahlin. After the tax-withholding transaction, he held 34,906 common shares directly.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Harish Jayabalan, EVP, CISO and CRO, reported paired option exercises and share sales in MIAX common stock. On June 8 and 9, he exercised a total of 20,000 nonqualified stock options at $12.00 per share and sold the same 20,000 shares in open-market transactions, creating a net-sell of option exposure but no change in his common share holdings.
The sales were executed at weighted average prices of $40.12 and $40.04 per share and were carried out under a previously established Rule 10b5-1 trading plan. Following these transactions, Jayabalan continues to hold 73,405 common shares directly and retains 834 nonqualified stock options with a $12.00 exercise price expiring on October 12, 2027.
Miami International Holdings director Judson Gray Teekell sold 3,000 shares of common stock in an open-market transaction. The sale occurred on June 2, 2026 at a weighted average price of $42.78 per share. After this trade, he directly holds 71,014 shares. The transaction was executed under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025, meaning the sale was pre-scheduled rather than opportunistic. Trades were filled in multiple lots during the day at prices ranging from $41.53 to $43.99.
MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert reported an option exercise paired with a share sale. He exercised stock options to acquire 5,250 shares of common stock at $12.00 per share, then sold 5,250 shares in an open-market transaction at a weighted average price of $42.76 per share. The sale was carried out under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025. Following these transactions, he directly holds 142,375 shares of common stock, and the exercised options are fully vested and exhausted for the exercised amount.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Barbara J. Comly, EVP, General Counsel and Corporate Secretary, reported an exercise-and-sale transaction in company common stock. On 2026-06-02, she exercised nonqualified stock options for 28,000 shares at $12.00 per share and sold 28,000 shares in an open-market transaction at a weighted-average price of $42.85 per share. Following the sale, she directly held 843,844 common shares. The stock sale was carried out under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel reported an exercise-and-sell transaction in company stock. On June 2, 2026, he exercised 11,000 nonqualified stock options at $12.00 per share and sold 11,000 common shares in open-market trades at a weighted average price of $42.16 per share. The sale was carried out under a previously established Rule 10b5-1 trading plan, indicating it was pre-planned. After these transactions, Deitzel directly holds 116,221 common shares, and the option award has 7,333 options remaining outstanding, which are fully vested and expire on May 17, 2028.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Douglas M. Schafer Jr., EVP and CIO, executed an option exercise-and-sale on Common Stock. On June 2, 2026, he exercised 48,000 Nonqualified Stock Options at $12.00 per share to acquire 48,000 common shares, then sold those 48,000 shares in an open-market transaction at a weighted average price of $42.84 per share. These trades were carried out under a previously established Rule 10b5-1 Plan adopted on December 16, 2025. After the transactions, he directly holds 396,681 common shares and 6,000 Nonqualified Stock Options, which are fully vested and remain exercisable until their stated expiration.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Shelly Brown, EVP and Chief Strategy Officer, reported an exercise-and-sale transaction in company common stock. Brown exercised options to acquire 16,000 shares at $12.00 per share and sold 16,000 shares at a weighted average price of $42.12 per share.
The sale was executed in multiple trades on June 2, 2026 under a previously established Rule 10b5-1 trading plan adopted on December 22, 2025. Following these transactions, Brown directly holds 325,047 shares of MIAX common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. Chairman & CEO Thomas P. Gallagher, through Gallagher Investments, LLC, exercised options for 70,000 shares of common stock at $12.00 per share and sold 70,000 shares at a weighted average of $42.36 on June 2, 2026.
The sales were made in open-market transactions under a previously established Rule 10b5-1 Plan adopted on December 29, 2025. Following these transactions, Gallagher Investments, LLC holds 1,723,275 shares of common stock indirectly controlled by Mr. Gallagher.
Horizon Kinetics Asset Management LLC (HKAM), a more than 10% owner of MIAMI INTERNATIONAL HOLDINGS, INC., reported an internal restructuring of its indirect holdings of common stock. The filing shows a non-cash, in-kind pro rata distribution that reduced HKAM’s pecuniary interest in certain shares.
The change reflects a reduction of 2,455,744 shares that were distributed in-kind without consideration, plus 7,200 shares in an account where HKAM no longer has a pecuniary interest. Following these changes, HKAM reports indirect ownership of 2,170,898 shares in this Form 4 and separately reports beneficial ownership of 7,400,316 shares, or 7.8 percent of the issuer’s outstanding shares, in an amended Schedule 13D.
MIAMI INTERNATIONAL HOLDINGS director Judson Gray Teekell exercised stock options and had shares withheld for taxes. On May 19, 2026, he exercised options to acquire 22,667 shares of common stock at an exercise price of $12.00 per share.
The company withheld 4,991 shares at a reference price of $54.51 per share to cover the option exercise price and related tax obligations, which the footnote states does not represent a market sale. Following these transactions, Teekell directly holds 74,014 common shares.
Miami International Holdings EVP and CFO Lance Emmons sold 35,000 shares of Common Stock in an open-market transaction at an average price of $56.36 per share. After the sale, he directly holds 84,262 shares. The transaction was executed under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025, indicating it was pre-planned rather than a discretionary trade.
MIAMI INTERNATIONAL HOLDINGS, INC. Chairman & CEO Thomas P. Gallagher exercised incentive stock options to acquire 24,999 shares of Common Stock at $12.00 per share. Following the option exercise, he holds 510,962 Common Stock shares directly. The exercised options were fully vested and no share sales were reported.
Miami International Holdings reported that Chairman & CEO Thomas P. Gallagher, through Gallagher Investments, LLC, exercised nonqualified stock options for 15,771 shares at $12 and sold 15,771 common shares at a weighted average $47.92 under a Rule 10b5-1 plan, and now indirectly holds 1,723,275 common shares.
Miami International Holdings Chairman & CEO Thomas P. Gallagher, through Gallagher Investments, LLC, executed an exercise-and-sell transaction in MIAX common stock. On May 4, 2026, Gallagher Investments exercised 54,229 nonqualified stock options at $12.00 per share and sold 54,229 common shares in open-market trades at an average price of $47.26 per share.
All transactions were made under a previously established Rule 10b5-1 Plan adopted on December 29, 2025. After these transactions, Gallagher Investments held 1,723,275 MIAX common shares indirectly for Mr. Gallagher and retained 225,771 nonqualified stock options that are fully vested and remain exercisable until August 2, 2026.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel, EVP and CRO/CCO of MIAX Exchanges, reported an option exercise combined with a share sale. He exercised nonqualified stock options to acquire 11,000 shares of common stock at $12.00 per share, then sold 11,000 shares in open-market transactions at a weighted average price of $47.28 per share. After these transactions, he directly holds 116,221 shares of common stock and 18,333 nonqualified stock options expiring on May 17, 2028. The sale was carried out under a previously established Rule 10b5-1 trading plan adopted on December 30, 2025, indicating the trades were pre-scheduled.
MIAMI INTERNATIONAL HOLDINGS EVP and Chief Strategy Officer Shelly Brown executed an option exercise and sale of company stock. On May 4, 2026, Brown exercised options to acquire 16,000 shares of common stock at $12.00 per share and sold 16,000 shares in an open‑market transaction at a weighted average price of $47.28 per share.
These trades were carried out under a previously established Rule 10b5-1 trading plan adopted on December 22, 2025, indicating they were pre‑scheduled. After the transactions, Brown directly held 325,047 shares of MIAX common stock.
Miami International Holdings director Judson Gray Teekell reported an open-market sale of 3,000 shares of Common Stock on May 4, 2026 at a weighted average price of $47.30 per share, with individual trades executed between $47.14 and $47.55.
After this sale, he directly holds 56,338 shares of MIAX common stock. The transaction was carried out under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025, indicating it was pre-scheduled rather than timed discretionarily.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Douglas M. Schafer Jr., EVP and CIO, reported an exercise-and-sale transaction in company stock. He exercised nonqualified stock options to acquire 48,000 shares of Common Stock at $12.00 per share, then sold 48,000 shares in open-market trades at a weighted average price of $47.25 per share. After these transactions, he directly holds 396,681 shares of Common Stock. The sale was carried out under a previously established Rule 10b5-1 Plan adopted on December 16, 2025.
MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert exercised stock options for 5,625 shares of Common Stock at $12.00 per share and on the same day sold 5,625 shares in an open-market transaction.
The sale was executed at a weighted average price of $47.29 per share, with individual trades ranging from $47.09 to $47.53, under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025. After these transactions, he holds 142,375 shares of Common Stock directly and 11,563 fully vested stock options expiring on May 31, 2027.
MIAMI International Holdings EVP, GC & Corporate Secretary Barbara J. Comly reported an exercise-and-sell transaction in company common stock. On May 4, 2026, she exercised 28,000 nonqualified stock options at $12.00 per share and acquired the same number of common shares.
On the same date, she executed an open-market sale of 28,000 common shares at an average price of $47.26 per share, pursuant to a pre-established Rule 10b5-1 Plan adopted on December 18, 2025. Following these transactions, she directly holds 843,844 common shares and 84,000 nonqualified stock options that are reported as fully vested.
MIAMI INTERNATIONAL HOLDINGS, INC. Chairman & CEO Thomas P. Gallagher, through Gallagher Investments, LLC, exercised 70,001 nonqualified stock options for Common Stock at $12.00 per share, then sold a total of 224,025 Common shares in open-market transactions on April 15, 2026.
The sales by Gallagher Investments, LLC occurred at prices including $43.36 and $43.68 per share, with a disclosed intraday range from $42.57 to $44.41, under a previously established Rule 10b5-1 trading plan. After these trades, indirect holdings via Gallagher Investments, LLC were 1,723,275 shares, and direct holdings were 485,963 shares, which include 12,000 shares held jointly with his spouse.
MIAMI INTERNATIONAL HOLDINGS, INC. EVP, GC & Corporate Secretary Barbara J. Comly exercised options and sold shares in a planned transaction. She exercised nonqualified stock options for 29,667 shares of common stock at $12.00 per share and sold 29,667 shares at a weighted average price of $43.64 per share under a previously established Rule 10b5-1 Plan. Following these transactions, she directly holds 843,844 shares of common stock. The exercised options were fully vested, and the sale price reflects trades executed between $42.68 and $44.37 on the same date.
MIAMI INTERNATIONAL HOLDINGS, INC. director John Beckelman exercised stock options to acquire 8,667 shares of common stock at $12.00 per share. The options were fully vested at the time of exercise. Following the transaction, he directly holds 8,667 shares of common stock and no remaining options from this grant.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Shelly Brown exercised and sold shares in a planned transaction. On April 8, 2026, Brown exercised nonqualified stock options to acquire 16,434 shares of common stock at $12.00 per share and immediately sold 16,434 shares in an open-market transaction at a weighted average price of $42.08 per share. The filing notes the options were fully vested and the trades were executed under a previously established Rule 10b5-1 Plan adopted on December 22, 2025. After these transactions, Brown directly held 325,047 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel exercised fully vested stock options and sold the resulting shares in pre-planned trades. Over April 7–8, he exercised options to acquire a total of 12,335 shares of common stock at $12.00 per share, then sold the same 12,335 shares in open-market transactions at prices around $42.00–$42.13. These transactions were executed under a previously established Rule 10b5-1 trading plan adopted on December 30, 2025, and Deitzel continues to hold 116,221 shares of common stock directly after the activity.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Shelly Brown amended her insider trading report to correct an option exercise and related holdings. On April 7, she exercised 900 Nonqualified Stock Options at $12.00 per share, acquiring 900 shares of common stock, and simultaneously sold 900 shares at $42.00 per share.
She also sold 2,357 common shares on April 6 at $41.33 per share. After these transactions, she directly held 325,047 common shares and 64,434 option-based derivative securities. A footnote states the filing reflects a correction to the original option exercise and to the amount of securities beneficially owned.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Shelly Brown, EVP and Chief Strategy Officer, sold a total of 3,257 shares of common stock in two open-market transactions. On April 7, 2026, she sold 900 shares at about $42.00 per share. On April 6, 2026, she sold 2,357 shares at about $41.33 per share. After these sales, she directly holds 324,147 shares. The filing notes that at least one transaction was carried out under a pre-established Rule 10b5-1 trading plan, indicating the sales were pre-planned rather than timed discretionarily.
MIAMI INTERNATIONAL HOLDINGS, INC. director Judson Gray Teekell reported an open-market sale of 2,700 shares of Common Stock at $40.00 per share. After this transaction, he directly owns 59,338 shares. The trade was executed under a pre-established Rule 10b5-1 Plan adopted on December 17, 2025, indicating the sale was pre-planned rather than opportunistic.
MIAMI INTERNATIONAL HOLDINGS, INC. executive John Smollen reported a routine tax-related share disposition. On this Form 4, he surrendered 362 shares of common stock at $37.50 per share to the company to cover tax withholding tied to restricted stock awards. A footnote clarifies this was not an open-market sale by the reporting person. After this transaction, Smollen directly holds 170,757 shares of MIAX common stock.
MIAMI INTERNATIONAL HOLDINGS EVP and Chief Strategy Officer Shelly Brown exercised stock options to acquire additional common shares. On March 30, 2026, she exercised multiple fully vested Incentive Stock Options, converting rights to buy 30,016 shares of Common Stock at strike prices ranging from $12.00 to $25.78 per share.
A total of 1,809 Common Stock shares were surrendered at $37.50 per share to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards, which the filing states does not represent a sale. Following these transactions, Brown directly owned 327,404 shares of Common Stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Barbara J. Comly reported a routine share disposition related to equity compensation. On this Form 4, 1,448 shares of common stock were surrendered to the company at $37.50 per share to cover tax withholding on vested restricted stock awards, which the footnote states does not represent a sale. After this tax-withholding transaction, she directly holds 843,844 shares of common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Edward Deitzel, EVP, CRO and CCO of MIAX Exchanges, reported a routine tax-related share disposition. On March 30, 2026, 707 shares of common stock at $37.50 per share were surrendered to the company solely to cover tax withholding on vested restricted stock awards.
The footnote explains this transaction does not represent an open-market sale by Deitzel. After this tax-withholding event, he directly holds 116,221 shares of MIAX common stock.
MIAMI INTERNATIONAL HOLDINGS, INC. Chairman & CEO Thomas P. Gallagher reported an indirect tax-withholding disposition of 20,875 shares of Common Stock on March 30, 2026. The shares, held by Gallagher Investments, LLC, were surrendered to the company at $37.50 per share to cover tax obligations from restricted stock awards and did not involve an open-market sale. Following this transaction, indirect holdings reported through Gallagher Investments, LLC totaled 1,827,399 shares of Common Stock, over which Mr. Gallagher maintains beneficial ownership with voting and dispositive control.
MIAMI INTERNATIONAL HOLDINGS, INC. executive vice president and CFO Lance Emmons surrendered 8,350 shares of common stock at $37.50 per share on March 30, 2026 to cover tax obligations on restricted stock awards. This tax-withholding disposition was not an open-market sale, and Emmons now directly holds 119,262 shares.
MIAMI INTERNATIONAL HOLDINGS, INC. director Judson Gray Teekell reported an open-market sale of 300 shares of common stock at $40.00 per share on March 25, 2026. The transaction was executed as a non-derivative sale.
Following this sale, Teekell directly holds 62,038 shares of the company’s common stock. According to the footnotes, the trade was carried out under a previously established Rule 10b5-1 trading plan adopted on December 17, 2025 and was executed in multiple trades at a weighted average price of $40.00.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Shelly Brown, EVP and Chief Strategy Officer, sold 25,932 shares of common stock in an open-market transaction at a weighted average price of $39.33 per share. The shares were sold under a previously established Rule 10b5-1 trading plan adopted on December 22, 2025, indicating the sales were pre-scheduled. Following the transaction, Brown directly holds 299,197 shares. The trade was executed in multiple transactions during the day, at prices ranging from $38.98 to $39.80 per share.
MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert exercised stock options for 12,917 shares of common stock at $12.00 per share and then sold 37,917 shares in the open market. The sales were made at a weighted average price of $39.00 per share, with individual trades ranging from $38.62 to $39.48. These transactions were carried out under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025, indicating they were pre-planned rather than discretionary. Following the transactions, Eckert directly holds 142,375 shares of common stock, and the exercised options are fully vested with no remaining derivative position reported.
MIAMI INTERNATIONAL HOLDINGS EVP and CIO Douglas M. Schafer Jr. exercised stock options and sold shares in a planned transaction. He exercised 48,000 Nonqualified Stock Options at $12.00 per share, receiving 48,000 shares of common stock. The same day, he sold 48,000 common shares at a weighted average price of $39.74 per share in open‑market trades made under a previously established Rule 10b5‑1 trading plan. After these transactions, he directly owns 396,681 common shares. The options exercised were fully vested, and no remaining derivative positions are shown in this filing.
MIAMI INTERNATIONAL HOLDINGS, INC. executive Barbara J. Comly, EVP, GC & Corporate Secretary, exercised incentive stock options to acquire a total of 33,332 shares of Common Stock at $12.00 per share. Following these option exercises, she directly owns 845,292 shares of Common Stock.