MIAX — MIAMI INTERNATIONAL HOLDINGS, INC.
Price · 2025-08-14 → 2026-08-21
257 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2025-08-14.
Performance
Technicals
Measured signals that fired on MIAX
| date | signal | measured base rate |
|---|---|---|
| 2026-07-29 | Fair value gap, bullish structure | -0.67% over 21 days · t = -6.43 · n = 111,973 statistically distinguishable from its control group |
| 2026-07-02 | Fair value gap, bullish structure | -0.67% over 21 days · t = -6.43 · n = 111,973 statistically distinguishable from its control group |
| 2026-06-18 | Equal lows taken out structure | -0.64% over 21 days · t = -4.75 · n = 55,661 statistically distinguishable from its control group |
| 2026-06-02 | Fair value gap, bearish structure | -0.45% over 21 days · t = -3.29 · n = 108,591 statistically distinguishable from its control group |
| 2026-04-21 | Equal highs taken out structure | -0.70% over 21 days · t = -8.28 · n = 68,636 statistically distinguishable from its control group |
| 2026-04-07 | Fair value gap, bullish structure | -0.67% over 21 days · t = -6.43 · n = 111,973 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-08-19 | Gallagher Thomas P. Chairman & CEO | Open-market sale 10b5-1 plan | 149.7K | 41.13 | 6.2M |
| 2026-08-18 | Gallagher Thomas P. Chairman & CEO | Shares withheld for tax 10b5-1 plan | 150.3K | 42.41 | 6.4M |
| 2026-08-18 | Comly Barbara J. EVP, GC & Corporate Secretary | Shares withheld for tax | 43.4K | 42.41 | 1.8M |
| 2026-08-17 | Emmons Lance EVP and CFO | Open-market sale 10b5-1 plan | 35.0K | 42.83 | 1.5M |
| 2026-08-17 | Schwarzkopf Cynthia Director | Open-market sale 10b5-1 plan | 5.0K | 42.85 | 214.2K |
| 2026-08-17 | Schwarzkopf Cynthia Director | Option exercise 10b5-1 plan | 5.0K | 12.00 | 60.0K |
| 2026-08-04 | Gallagher Thomas P. Chairman & CEO | Open-market sale 10b5-1 plan | 48.3K | 45.69 | 2.2M |
| 2026-08-04 | Schafer Douglas M. JR EVP and CIO | Open-market sale 10b5-1 plan | 48.0K | 45.71 | 2.2M |
| 2026-08-04 | Comly Barbara J. EVP, GC & Corporate Secretary | Open-market sale 10b5-1 plan | 44.4K | 45.69 | 2.0M |
| 2026-08-04 | Jayabalan Harish EVP, CISO and CRO | Open-market sale 10b5-1 plan | 20.0K | 45.90 | 918.0K |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| HORIZON KINETICS ASSET MANAGEMENT LLC | 134.3M | 3.5M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 128.3M | 3.3M |
| BlackRock, Inc. | 86.9M | 2.2M |
| CITADEL ADVISORS LLC | 62.6M | 1.6M |
| Invesco Ltd. | 61.7M | 1.6M |
| Alyeska Investment Group, L.P. | 56.3M | 1.4M |
| VANGUARD CAPITAL MANAGEMENT LLC | 55.1M | 1.4M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 53.5M | 1.4M |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 48.5M | 1.2M |
| AMERICAN CENTURY COMPANIES INC | 47.5M | 1.2M |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
Recent headlines
- TISE Reports H1 2026 Listing Results; Sets Records for Total Number and Value of Listings · 2026-08-13
- TISE Reports H1 2026 Listing Results; Sets Records for Total Number and Value of Listings · 2026-08-13
- TISE Reports H1 2026 Listing Results; Sets Records for Total Number and Value of Listings · 2026-08-13
- TISE Reports H1 2026 Listing Results; Sets Records for Total Number and Value of Listings · 2026-08-13
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