MIAX MIAMI INTERNATIONAL HOLDINGS, INC. Insider Trading

EVP/GC Barbara J. Comly sold 28,000 MIAX shares at $41.98; stock down 27.8% from 52-week high, scheduled 10b5-1 plan.

Barbara J. Comly sold 28,000 shares (reducing holdings by 3.1% to 883.0K shares) as part of a pre-arranged 10b5-1 trading plan adopted on 2025-12-18, making this a scheduled transaction rather than a discretionary one. At the sale price of $41.98, the current market price of $41.24 is 27.8% below the 52-week high of $57.14, and her prior sales at MIAX have shown mixed outcomes: the 2026-04-15 sale returned +28.7% over 30 days but -6.3% over 90 days, while the 2026-05-04 sale declined -14.7% at 30 days. The company posted quarterly revenue of $369.7M and net income of $170.2M, though full-year results were unprofitable, with a P/E of 32.22 and market cap of $3.9B. Her cross-ticker track record of 4 prior sells shows an average 90-day return of -6.3%, consistent with the longer-term weakness observed at MIAX, though this sale itself is governed by a pre-arranged schedule rather than discretionary timing.

CEO Thomas P. Gallagher sold 70,000 shares of MIAX at $42.52 via pre-arranged 10b5-1 plan; stock now $41.24, down 27.8% from 52-week high.

Thomas P. Gallagher (Chairman & CEO) executed a scheduled sale of 70,000 shares at $42.52 on 2026-07-13 under a pre-arranged 10b5-1 trading plan adopted on 2025-12-29, reducing his non-derivative holdings from 1,793,275 shares to 1,723,275 shares. This was a preplanned transaction, not a discretionary decision made in response to current market conditions. The stock has since declined to $41.24, sitting 27.8% below its 52-week high of $57.14 and down 4.7% over the 30 days following the transaction. Gallagher's prior sales at MIAX have shown mixed 30-day outcomes (ranging from -17.3% to +29.5%), with no 90-day measurement yet available for most recent trades, making it difficult to assess whether this scheduled sale aligns with a pattern of trading acuity at this ticker specifically. The company posted strong recent fundamentals (revenue of $369,690,000.00 with net income of $170,224,000.00 in the latest quarter and annual revenue growth of +19.6%), though it was unprofitable over the most recent full fiscal year.

Chairman Gallagher sells 70,000 MIAX shares for $2,951,381.04 via pre-arranged 10b5-1 plan

Thomas P. Gallagher executed 2 separate sales totaling 70,000 shares ($2,951,381.04) under a pre-arranged 10b5-1 trading plan adopted on 2025-12-29, reducing his non-derivative holdings from 1,793,275 shares to 1,723,275 shares. The 70,000 option shares remain exercisable per his derivative holdings (168,228 total). MIAX stock has appreciated +11.5% over the past 30 days and +3.5% over 90 days, currently trading at $43.71 versus the blended sale price of $42.16. Gallagher's prior sales at this ticker show mixed near-term performance: 4 of 5 prior MIAX sales produced negative 30-day returns, though outcomes beyond 30 days are not yet measurable for the most recent transactions. Because this transaction executes a scheduled plan rather than a discretionary decision, it does not reflect market timing or current conviction signals.

EVP/CISO Jayabalan sells 20,000 MIAX shares at $42.12 under 10b5-1 plan; retains 78,065 shares plus 14,168 derivative holdings

Harish Jayabalan, EVP CISO and CRO, sold 20,000 shares of MIAX at $42.12 on 2026-07-06 under a 10b5-1 trading plan adopted on 2026-03-09, reducing his non-derivative holdings from 98,065 to 78,065 shares while maintaining 14,168 shares in nonqualified stock options. This represents a scheduled transaction, not a discretionary sale. The sale follows two prior sells at MIAX on 2026-06-09 and 2026-06-08, establishing a recent pattern of share reductions at this ticker. Jayabalan's cross-ticker track record shows 1 prior buy with an average 90-day return of +115.1%, though the measurable outcomes at MIAX itself are limited to one prior trade (a 2025-08-13 buy with +115.1% 90-day return). The company reported net income of $170.2M on revenue of $369.7M in the latest quarter and +19.6% annual revenue growth, yet was unprofitable over its most recent full fiscal year, signaling near-term profitability that did not persist year-over-year.

Shelly Brown (EVP, Chief Strategy Officer) sells 16,000 MIAX shares at $42.13 under pre-arranged 10b5-1 plan

EVP and Chief Strategy Officer Shelly Brown executed a scheduled sale of 16,000 shares at $42.13 on 2026-07-06 under a 10b5-1 trading plan adopted on 2025-12-22, reducing her non-derivative holdings to 354.0K shares from 370.0K shares. This is a routine, pre-arranged transaction, not a discretionary trade driven by current market timing or conviction. Brown's prior four sales at MIAX show mixed results: two recent sales on 2026-06-02 and 2026-05-04 have experienced 30-day declines of -3.0% and -14.7% respectively, while her earlier sales on 2026-04-08 and 2026-03-23 posted 30-day gains of +23.6% and +15.1%. The stock is currently trading at $43.71, 23.5% below the 52-week high of $57.14, and the company reported strong recent fundamentals with revenue of $369.7M, net income of $170.2M in the latest quarter, and annual revenue growth of +19.6%, though full-year results were unprofitable. The scheduled nature of this sale limits what can be inferred about Brown's current conviction regarding the business.

EVP/GC Barbara J. Comly sold 28,000 MIAX shares at $41.22 under pre-arranged 10b5-1 plan; retains 28,000 options

Barbara J. Comly, EVP, General Counsel & Corporate Secretary of MIAMI INTERNATIONAL HOLDINGS, INC., sold 28,000 shares at $41.22 on 2026-07-02 for a total value of $1,154,160.00. The sale was executed under a pre-arranged 10b5-1 trading plan adopted on 2025-12-18, meaning this was a scheduled, non-discretionary transaction. Post-sale, Comly holds 882,984 non-derivative shares and retains 28,000 shares through nonqualified stock options. The company reported latest quarterly revenue of $369,690,000.00 and net income of $170,224,000.00, with annual revenue growth of +19.6%; however, the company was unprofitable on a full-year basis. The stock is currently trading at $43.71, -23.5% from its 52-week high, suggesting a recent pullback from elevated valuations. Because this transaction is scheduled under a pre-arranged plan rather than a discretionary choice, it reflects a predetermined execution schedule rather than a market-timing decision by the executive.

CIO Schafer sells 48,000 MIAX shares at $41.22 under pre-arranged 10b5-1 plan; retains 387,414 shares plus 91,334 derivative holdings.

Douglas M. Jr Schafer, EVP and CIO, sold 48,000 shares (11.0% of pre-transaction holdings) for $1,978,560.00 as part of a pre-arranged 10b5-1 trading plan adopted on 2025-12-16. This is a scheduled, non-discretionary transaction; the trade occurred at $41.22 while the current price stands at $43.71. His same-ticker history shows mixed outcomes: a prior sell on 2026-03-17 saw 90-day gains of +11.0%, while sells on 2026-06-02 and 2026-05-04 are tracking -4.7% and -14.6% respectively over 30 days. The company reported strong fundamentals with $369.7M quarterly revenue, $170.2M net income, and +19.6% annual revenue growth, though full-year fiscal results remain unprofitable. Schafer retains substantial non-derivative holdings of 387.4K shares and derivative holdings of 91,334 shares, maintaining a meaningful ownership stake.

MIAX CISO Jayabalan sells 20,000 shares in 2 transactions for $801,617.36 under pre-arranged 10b5-1 plan

Harish Jayabalan, EVP, CISO and CRO, executed 2 separate sales totaling 20,000 shares ($801,617.36) at blended average price $40.08 on 2026-06-08 and 2026-06-09, reducing non-derivative holdings from 93,405 to 73,405 shares. The sales were scheduled under a pre-arranged 10b5-1 trading plan adopted 2026-03-09, indicating non-discretionary execution. The insider retains 11,451 derivative shares in the form of nonqualified stock options. The stock trades at $40.79 (current), down -28.6% from its 52-week high of $57.14 and down -21.8% over 30 days, while the company reported revenue of $369,690,000.00 and net income of $170,224,000.00 in the latest quarter with +19.6% annual revenue growth.

EVP/GC Comly sells 28,000 MIAX shares at $42.85 via scheduled 10b5-1 plan; retains 843,844 shares plus 56,000 stock options

Barbara J. Comly, EVP, GC & Corporate Secretary, sold 28,000 shares (representing -3.2% of her pre-transaction holdings of 871,844 shares) for a total value of $1,199,800.00 at $42.85 per share on 2026-06-02. This transaction is part of a pre-arranged 10b5-1 trading plan adopted on 2025-12-18 and is therefore scheduled rather than discretionary. After the sale, Comly retains 843,844 non-derivative shares and 56,000 shares via nonqualified stock options (derivative holdings), maintaining a substantial position in the company. At the same ticker, her prior two sales (2026-05-04 and 2026-04-15) showed mixed 30-day outcomes (+28.7% and -14.7% respectively) but both closed negative over 90 days, though this current transaction's timing is predetermined by plan and not responsive to market conditions. The company reported $369.7M in latest-quarter revenue with $170.2M net income, though full-year results were unprofitable, adding context but not explaining this particular scheduled disposition.

EVP/CIO Schafer sells 48,000 MIAX shares ($2.1M) via pre-arranged 10b5-1 plan; holds 396,681 shares post-trade plus 6,000 options

Douglas M. Jr Schafer, EVP and CIO, sold 48,000 shares of MIAX at $42.84 on 2026-06-02 as part of a 10b5-1 trading plan adopted on 2025-12-16, making this a scheduled transaction rather than a discretionary move. His non-derivative holdings declined from 444,681 shares to 396,681 shares, representing a -10.8% reduction, though he retains 6,000 nonqualified stock options, preserving material upside exposure. This is his second consecutive monthly sale at MIAX (prior sell on 2026-05-04), suggesting systematic portfolio rebalancing via the pre-arranged plan rather than reactive selling. The company reported $369.7M in latest-quarter revenue and $170.2M net income, but was unprofitable over its most recent full fiscal year, providing mixed fundamental context for insider activity.