MIAXNYSESecurity Brokers, Dealers & Flotation Companies
MIAMI INTERNATIONAL HOLDINGS, INC.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 7, 2026
$31.54+0.59 (+1.91%)
Close on Oct 19, 2026
- Market cap
- $3.49B
- P/E (TTM)
- 36.3
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
72.6%
72M of 99M shares
Institutional holders
205
48 new, 41 sold out
Net institutional buying
22M
In Q2 2026
Insider trades, 12 months
4 buys · 68 sales
Net sold $79.28M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Horizon Kinetics Holding Corp | 7,400,316 | 7.80% | 13D (active) amendment | May 19, 2026 |
| T. Rowe Price Investment Management, Inc. | 5,032,970 | 5.30% | 13G (passive) | Jun 30, 2026 |
| BlackRock, Inc. | 4,949,990 | 5.10% | 13G (passive) | Jun 30, 2026 |
| Horizon Kinetics Asset Management LLC | 11,162,809 | 12.20% | 13D (active) amendment | Apr 24, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of MIAX | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Horizon Kinetics Asset Management LLC | 7,842,173 | 7.90% | $291.42M | +4,390,624 | 3.30% |
| BlackRock, Inc. | 5,071,754 | 5.11% | $188.47M | +2,839,074 | 0.00% |
| T. Rowe Price Investment Management, Inc. | 5,032,970 | 5.07% | $187.03K | +887,352 | 0.12% |
| Vanguard Portfolio Management LLC | 3,786,418 | 3.82% | $140.70M | +2,411,472 | 0.01% |
| Susquehanna International Group, Llp | 3,355,043 | 3.38% | $124.67M | +58,697 | 0.01% |
| Vanguard Capital Management LLC | 3,165,686 | 3.19% | $117.64M | +1,750,707 | 0.00% |
| Invesco Ltd. | 2,020,650 | 2.04% | $75.09M | +435,647 | 0.01% |
| J Digital 6 LLC | 1,807,234 | 1.82% | $67.16M | New | 39.72% |
| Blair William & Co/Il | 1,769,432 | 1.78% | $65.75M | +1,103,651 | 0.17% |
| Balyasny Asset Management L.P. | 1,682,924 | 1.70% | $62.54M | New | 0.08% |
| American Century Companies Inc | 1,587,196 | 1.60% | $58.98M | +365,711 | 0.03% |
| State Street Corp | 1,432,894 | 1.44% | $53.25M | +720,565 | 0.00% |
| JPMorgan Chase & Co | 1,427,881 | 1.44% | $52.72M | +189,875 | 0.00% |
| Geode Capital Management, LLC | 1,395,680 | 1.41% | $51.87M | +615,898 | 0.00% |
| Adage Capital Partners Gp, L.L.C. | 1,143,920 | 1.15% | $42.51M | −103,079 | 0.06% |
| Healthcare Of Ontario Pension Plan Trust Fund | 1,039,449 | 1.05% | $38.63M | +799,449 | 0.05% |
| Lord, Abbett & Co. LLC | 1,000,866 | 1.01% | $37.19K | +140,179 | 0.11% |
| Morgan Stanley | 950,593 | 0.96% | $35.32M | −196,363 | 0.00% |
| Two Sigma Investments, LP | 888,109 | 0.89% | $33.00M | −5,609 | 0.02% |
| Allspring Global Investments Holdings, LLC | 857,682 | 0.86% | $33.49M | −254,579 | 0.05% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 205 | 72M | 72.6% | 48 / 92 | 46 / 41 | 31M | 9M |
| Q1 2026 | 202 | 50M | 50.6% | 80 / 84 | 26 / 35 | 18M | 4M |
| Q4 2025 | 161 | 38M | 38.3% | 69 / 61 | 21 / 23 | 15M | 3M |
| Q3 2025 | 115 | 26M | 26.5% | 115 / 0 | 0 / 0 | 26M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of MIAX | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 2,711,012 | 2.73% | $100.74M | 0.00% | Jun 30, 2026 |
| iShares Russell 2000 ETF | 1,994,266 | 2.01% | $74.11M | 0.09% | Jun 30, 2026 |
| Vanguard Small-Cap Index Fund | 1,958,309 | 1.97% | $72.77M | 0.04% | Jun 30, 2026 |
| T. Rowe Price Small-Cap Stock Fund, Inc. | 1,462,157 | 1.47% | $54.33M | 0.58% | Jun 30, 2026 |
| Small Cap Growth Fund | 1,353,482 | 1.36% | $63.67M | 1.14% | Jul 31, 2026 |
| Vanguard Small-Cap Value Index Fund | 1,240,908 | 1.25% | $46.11M | 0.07% | Jun 30, 2026 |
| Horizon Kinetics Inflation Beneficiaries ETF | 946,258 | 0.95% | $35.16M | 2.39% | Jun 30, 2026 |
| Franklin Small Cap Growth Fund | 848,300 | 0.85% | $39.90M | 1.61% | Jul 31, 2026 |
| Fidelity Small Cap Index Fund | 836,284 | 0.84% | $39.34M | 0.12% | Jul 31, 2026 |
| T. Rowe Price Institutional Small-Cap Stock Fund | 778,478 | 0.78% | $28.93M | 0.58% | Jun 30, 2026 |
| T. Rowe Price Small-Cap Value Fund, Inc. | 715,840 | 0.72% | $26.60M | 0.25% | Jun 30, 2026 |
| iShares Russell 2000 Growth ETF | 706,919 | 0.71% | $26.27M | 0.17% | Jun 30, 2026 |
| JPMorgan Small Cap Equity Fund | 659,513 | 0.66% | $24.51M | 0.85% | Jun 30, 2026 |
| Invesco Main Street Small Cap Fund | 538,855 | 0.54% | $20.02M | 0.75% | Jun 30, 2026 |
| Columbia Acorn Fund | 467,678 | 0.47% | $17.38M | 0.63% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Thomas P. Gallagher | Chairman & CEO, Director | 2,209,817 | 2.23% | Sep 4, 2026 |
| Harish Jayabalan | EVP, CISO and CRO | 86,398 | 0.09% | Sep 29, 2026 |
| Shelly Brown | EVP, Chief Strategy Officer | 316,490 | 0.32% | Sep 17, 2026 |
| Douglas M. Schafer JR | EVP and CIO | 430,748 | 0.43% | Sep 4, 2026 |
| Edward Deitzel | EVP, CRO, CCO MIAX Exchanges | 119,601 | 0.12% | Sep 4, 2026 |
| Barbara J. Comly | EVP, GC & Corporate Secretary | 884,009 | 0.89% | Sep 4, 2026 |
| Lance Emmons | EVP and CFO | 86,542 | 0.09% | Aug 19, 2026 |
| John Smollen | EVP, New Product Development | 269,878 | 0.27% | Jun 18, 2026 |
| Cees Vermaas | CEO of TISEG | 4,660 | 0.00% | Jun 18, 2026 |
| Judson Gray Teekell | Director | 150,251 | 0.15% | Sep 4, 2026 |
| Cynthia Schwarzkopf | Director | 88,545 | 0.09% | Aug 19, 2026 |
| Kurt M. Eckert | Director | 149,612 | 0.15% | Aug 6, 2026 |
| David A. Brown | Director | 7,066 | 0.01% | Jul 9, 2026 |
| Abdulwahab A. Alnakib | Director | 534,924 | 0.54% | Jun 18, 2026 |
| Lisa Moore | Director | 12,737 | 0.01% | Jun 17, 2026 |
| Lee Becker | Director | 2,267 | 0.00% | Jun 17, 2026 |
| Talal Jassim Al-Bahar | Director | 3,658,187 | 3.69% | Jun 17, 2026 |
| Mark F. Raymond | Director | 62,094 | 0.06% | Jun 17, 2026 |
| John Beckelman | Director | 15,904 | 0.02% | Jun 17, 2026 |
| Jill E. Sommers | Director | 6,083 | 0.01% | Jun 17, 2026 |
| Eric Sites | Director | 5,684 | 0.01% | Jun 17, 2026 |
| Mark I. Massad | Director | 13,737 | 0.01% | Jun 17, 2026 |
| Kenneth W. Lozier | Director | 8,237 | 0.01% | Jun 17, 2026 |
| Paul Stahlin | Director | 42,143 | 0.04% | Jun 17, 2026 |
| Murray Stahl | Director, 10% owner | 4,581,654 | 4.62% | Mar 6, 2026 |
| Jamil Nazarali | Director | 2,500 | 0.00% | Aug 15, 2025 |
| Kinetics Asset Management Llc Horizon | 10% owner | 2,170,898 | 2.19% | May 21, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Harish Jayabalan EVP, CISO and CRO | Sep 25, 2026 | Option exercise | +8,333 | $12.00 | $100.00K | 86,398 |
| Shelly Brown EVP, Chief Strategy Officer | Sep 16, 2026 | Sale(10b5-1 plan) | −21,217 | $38.61 | $819.19K | 316,490 |
| Shelly Brown EVP, Chief Strategy Officer | Sep 11, 2026 | Tax withholding | −16,283 | $42.54 | $692.68K | 337,707 |
| Edward Deitzel EVP, CRO, CCO MIAX Exchanges | Sep 3, 2026 | Sale(10b5-1 plan) | −11,000 | $42.21 | $464.31K | 119,601 |
| Edward Deitzel EVP, CRO, CCO MIAX Exchanges | Sep 3, 2026 | Option exercise | +11,000 | $12.00 | $132.00K | 130,601 |
| Thomas P. Gallagher Chairman & CEO, Director | Sep 3, 2026 | Option exercise | +4,464 | $22.40 | $99.99K | 786,542 |
| Thomas P. Gallagher Chairman & CEO, Director | Sep 3, 2026 | Option exercise | +13,140 | $15.22 | $199.99K | 782,078 |
| Thomas P. Gallagher Chairman & CEO, Director | Sep 3, 2026 | Option exercise | +8,333 | $12.00 | $100.00K | 768,938 |
| Thomas P. Gallagher Chairman & CEO, Director | Sep 3, 2026 | Option exercise | +16,666 | $12.00 | $199.99K | 760,605 |
| Thomas P. Gallagher Chairman & CEO, Director | Sep 3, 2026 | Sale(10b5-1 plan) | −47,000 | $42.43 | $1.99M | 1,423,275 |
| Thomas P. Gallagher Chairman & CEO, Director | Sep 3, 2026 | Option exercise | +47,000 | $12.00 | $564.00K | 1,470,275 |
| Barbara J. Comly EVP, GC & Corporate Secretary | Sep 2, 2026 | Option exercise | +44,445 | $12.00 | $533.34K | 884,009 |
| Barbara J. Comly EVP, GC & Corporate Secretary | Sep 2, 2026 | Sale(10b5-1 plan) | −44,445 | $40.49 | $1.80M | 839,564 |
| Judson Gray Teekell Director | Sep 2, 2026 | Sale(10b5-1 plan) | −3,000 | $40.89 | $122.67K | 69,251 |
| Judson Gray Teekell Director | Sep 2, 2026 | Sale(10b5-1 plan) | −5,545 | $41.58 | $230.56K | 81,000 |
| Douglas M. Schafer JR EVP and CIO | Sep 2, 2026 | Option exercise | +43,334 | $12.00 | $520.01K | 430,748 |
| Douglas M. Schafer JR EVP and CIO | Sep 2, 2026 | Option exercise | +4,666 | $12.00 | $55.99K | 435,414 |
| Douglas M. Schafer JR EVP and CIO | Sep 2, 2026 | Sale(10b5-1 plan) | −48,000 | $40.48 | $1.94M | 387,414 |
| Thomas P. Gallagher Chairman & CEO, Director | Aug 19, 2026 | Sale(10b5-1 plan) | −149,700 | $41.13 | $6.16M | 1,423,275 |
| Barbara J. Comly EVP, GC & Corporate Secretary | Aug 18, 2026 | Tax withholding | −43,420 | $42.41 | $1.84M | 839,564 |
| Thomas P. Gallagher Chairman & CEO, Director | Aug 18, 2026 | Tax withholding | −150,300 | $42.41 | $6.37M | 1,572,975 |
| Lance Emmons EVP and CFO | Aug 17, 2026 | Sale(10b5-1 plan) | −35,000 | $42.83 | $1.50M | 86,538 |
| Cynthia Schwarzkopf Director | Aug 17, 2026 | Sale(10b5-1 plan) | −5,000 | $42.85 | $214.25K | 88,545 |
| Cynthia Schwarzkopf Director | Aug 17, 2026 | Option exercise | +5,000 | $12.00 | $60.00K | 93,545 |
| Judson Gray Teekell Director | Aug 4, 2026 | Sale(10b5-1 plan) | −3,000 | $45.79 | $137.37K | 72,251 |
| Edward Deitzel EVP, CRO, CCO MIAX Exchanges | Aug 4, 2026 | Option exercise | +11,000 | $12.00 | $132.00K | 130,601 |
| Edward Deitzel EVP, CRO, CCO MIAX Exchanges | Aug 4, 2026 | Sale(10b5-1 plan) | −11,000 | $45.78 | $503.58K | 119,601 |
| Douglas M. Schafer JR EVP and CIO | Aug 4, 2026 | Sale(10b5-1 plan) | −48,000 | $45.71 | $2.19M | 387,414 |
| Douglas M. Schafer JR EVP and CIO | Aug 4, 2026 | Option exercise | +48,000 | $12.00 | $576.00K | 435,414 |
| Barbara J. Comly EVP, GC & Corporate Secretary | Aug 4, 2026 | Sale(10b5-1 plan) | −44,445 | $45.69 | $2.03M | 882,984 |
| Barbara J. Comly EVP, GC & Corporate Secretary | Aug 4, 2026 | Option exercise | +44,445 | $12.00 | $533.34K | 927,429 |
| Kurt M. Eckert Director | Aug 4, 2026 | Sale(10b5-1 plan) | −1,063 | $45.80 | $48.69K | 149,612 |
| Kurt M. Eckert Director | Aug 4, 2026 | Option exercise | +1,063 | $12.00 | $12.76K | 150,675 |
| Thomas P. Gallagher Chairman & CEO, Director | Aug 4, 2026 | Sale(10b5-1 plan) | −48,334 | $45.69 | $2.21M | 1,723,275 |
| Thomas P. Gallagher Chairman & CEO, Director | Aug 4, 2026 | Option exercise | +48,334 | $12.00 | $580.01K | 1,771,609 |
| Harish Jayabalan EVP, CISO and CRO | Aug 4, 2026 | Option exercise | +5,832 | $15.22 | $88.76K | 98,065 |
| Harish Jayabalan EVP, CISO and CRO | Aug 4, 2026 | Sale(10b5-1 plan) | −20,000 | $45.90 | $918.00K | 78,065 |
| Harish Jayabalan EVP, CISO and CRO | Aug 4, 2026 | Option exercise | +14,168 | $12.00 | $170.02K | 92,233 |
| Cynthia Schwarzkopf Director | Jul 15, 2026 | Sale(10b5-1 plan) | −5,000 | $42.00 | $210.00K | 88,545 |
| Cynthia Schwarzkopf Director | Jul 15, 2026 | Option exercise | +5,000 | $12.00 | $60.00K | 93,545 |
| Barbara J. Comly EVP, GC & Corporate Secretary | Jul 13, 2026 | Sale(10b5-1 plan) | −28,000 | $41.98 | $1.18M | 882,984 |
| Barbara J. Comly EVP, GC & Corporate Secretary | Jul 13, 2026 | Option exercise | +28,000 | $12.00 | $336.00K | 910,984 |
| Thomas P. Gallagher Chairman & CEO, Director | Jul 13, 2026 | Sale(10b5-1 plan) | −70,000 | $42.52 | $2.98M | 1,723,275 |
| Thomas P. Gallagher Chairman & CEO, Director | Jul 13, 2026 | Option exercise | +70,000 | $12.00 | $840.00K | 1,793,275 |
| David A. Brown Director | Jul 8, 2026 | Tax withholding | −171 | $43.72 | $7.48K | 7,066 |
| Thomas P. Gallagher Chairman & CEO, Director | Jul 7, 2026 | Sale(10b5-1 plan) | −28,228 | $42.27 | $1.19M | 1,723,275 |
| Thomas P. Gallagher Chairman & CEO, Director | Jul 7, 2026 | Option exercise | +28,228 | $12.00 | $338.74K | 1,751,503 |
| Shelly Brown EVP, Chief Strategy Officer | Jul 6, 2026 | Option exercise | +16,000 | $12.00 | $192.00K | 369,990 |
| Shelly Brown EVP, Chief Strategy Officer | Jul 6, 2026 | Sale(10b5-1 plan) | −16,000 | $42.13 | $674.08K | 353,990 |
| Edward Deitzel EVP, CRO, CCO MIAX Exchanges | Jul 6, 2026 | Option exercise | +3,667 | $12.00 | $44.00K | 130,601 |
| Edward Deitzel EVP, CRO, CCO MIAX Exchanges | Jul 6, 2026 | Sale(10b5-1 plan) | −11,000 | $42.04 | $462.44K | 119,601 |
| Edward Deitzel EVP, CRO, CCO MIAX Exchanges | Jul 6, 2026 | Option exercise | +7,333 | $12.00 | $88.00K | 126,934 |
| Harish Jayabalan EVP, CISO and CRO | Jul 6, 2026 | Option exercise | +16,667 | $12.00 | $200.00K | 95,566 |
| Harish Jayabalan EVP, CISO and CRO | Jul 6, 2026 | Option exercise | +2,499 | $12.00 | $29.99K | 98,065 |
| Harish Jayabalan EVP, CISO and CRO | Jul 6, 2026 | Sale(10b5-1 plan) | −20,000 | $42.12 | $842.40K | 78,065 |
| Harish Jayabalan EVP, CISO and CRO | Jul 6, 2026 | Option exercise | +834 | $12.00 | $10.01K | 78,899 |
| Thomas P. Gallagher Chairman & CEO, Director | Jul 6, 2026 | Option exercise | +41,772 | $12.00 | $501.26K | 1,765,047 |
| Thomas P. Gallagher Chairman & CEO, Director | Jul 6, 2026 | Sale(10b5-1 plan) | −41,772 | $42.09 | $1.76M | 1,723,275 |
| Barbara J. Comly EVP, GC & Corporate Secretary | Jul 2, 2026 | Sale(10b5-1 plan) | −28,000 | $41.22 | $1.15M | 882,984 |
| Barbara J. Comly EVP, GC & Corporate Secretary | Jul 2, 2026 | Option exercise | +28,000 | $12.00 | $336.00K | 910,984 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| M. Schafer Douglas Jr. Officer | Oct 2, 2026 | 120,000 | $4.05M | Oct 2, 2026 | Exercise of Stock Options |
| Brown Shelly Officer | Sep 16, 2026 | 21,217 | $838.28K | Sep 16, 2026 | Restricted Stock Awards |
| Investments Llc Gallagher Director, Officer | Sep 3, 2026 | 141,000 | $5.73M | Sep 3, 2026 | Exercise of Stock Options |
| Investments Llc Gallagher Director, Officer | Aug 19, 2026 | 149,700 | $6.27M | Aug 19, 2026 | Restricted Stock Awards |
| Emmons Lance Officer | Aug 17, 2026 | 35,000 | $1.52M | Aug 17, 2026 | Vested RSA's |
| Investments Llc Gallagher Director, Officer | Aug 4, 2026 | 48,334 | $2.26M | Aug 4, 2026 | Exercise of Stock Options |
| Gray Teekell J. Director | Aug 4, 2026 | 6,000 | $280.98K | Aug 4, 2026 | Previously Exercised Stock Options |
| Jayabalan Harish Officer | Aug 4, 2026 | 63,902 | $2.99M | Aug 4, 2026 | Exercise of Stock Options |
| J. Comly Barbara Officer | Aug 4, 2026 | 180,557 | $8.46M | Aug 4, 2026 | Exercise of Stock Options |
| Deitzel Edward Officer | Aug 4, 2026 | 44,000 | $2.06M | Aug 4, 2026 | Exercise of Stock Options |
| Schwarzkopf Cynthia Director | Jul 15, 2026 | 15,000 | $619.50K | Jul 15, 2026 | Exercise of Stock Options |
| Brown Shelly Officer | Jul 6, 2026 | 16,000 | $653.44K | Jul 6, 2026 | Exercise of Stock Options |
| Jayabalan Harish Officer | Jul 6, 2026 | 20,000 | $816.80K | Jul 6, 2026 | Exercise of Stock Options |
| M. Eckert Kurt Director | Jul 2, 2026 | 6,313 | $246.52K | Jul 2, 2026 | Exercise of Stock Options |
| M. Schafer Douglas Jr. Officer | Jul 2, 2026 | 144,000 | $5.62M | Jul 2, 2026 | Exercise of Stock Options |