Miami International Holdings, Inc. (MIAX)
MIAX moved a median of +0.34% 30 minutes after news, and -0.16% by the close. How MIAX actually reacts to news — the realized, point-in-time move the market made, measured across 339 labeled events over the last three years with zero look-ahead.
MIAX’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.23% | 67% | 334 |
| 30-min | +0.34% | 59% | 335 |
| 60-min | +0.18% | 53% | 335 |
| to close | -0.16% | 47% | 334 |
| Middle 50% of MIAX reactions | -0.79% to +1.42% |
|---|---|
| Median reaction (30-min) | +0.34% |
| Measured reactions | 339 |
Half of all Miami International Holdings, Inc. news events land between -0.79% and +1.42% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How MIAX reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 10 | -0.14% | 30% | +0.34% |
| Analyst downgrades | 10 | +0.89% | 70% | +1.23% |
| Coverage initiations | 22 | +0.76% | 100% | +7.88% |
| Rating reiterations | 26 | +0.07% | 54% | -0.28% |
| Price-target raises | 11 | -1.05% | 46% | -0.28% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. See how MIAX ranks against every other measured name →
That’s how MIAX usually reacts — get an email when it moves on news →Email me when MIAX moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to MIAX's baseline. Nothing else.
Recent MIAX events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| MIAX Announces Bloomberg Equity Index Futures Now Available on NinjaTrader | Press release | PR Newswire | -0.25% | +3.14% | |
| Miami International Holdings Reports September 2026 Trading Results | Press release | PR Newswire | -1.36% | -10.75% | |
| Miami International Holdings Announces Date of Third Quarter 2026 Earnings Release and Conference Call | Press release | PR Newswire | +0.33% | +0.15% | |
| Miami International Holdings Announces OCC Clearing Membership for its FCM | Press release | PR Newswire | -0.75% | -1.03% | |
| Miami International Holdings Reports August 2026 Trading Results | Press release | PR Newswire | +0.01% | +1.46% | |
| TISE Reports H1 2026 Listing Results; Sets Records for Total Number and Value of Listings | Press release | PR Newswire | +0.00% | +0.32% | |
| Form 10-Q MIAMI INTERNATIONAL HOLD For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +1.66% | -1.36% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Aug 05 | SEC filing · Form 8-K | SEC EDGAR | +0.63% | -1.58% | |
| Miami International Holdings Reports July 2026 Trading Results | Press release | PR Newswire | +0.63% | -1.58% | |
| Miami International Holdings Reports Second Quarter 2026 Results | Press release | PR Newswire | +0.63% | -1.58% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Jul 20 | SEC filing · Form 8-K | SEC EDGAR | +0.48% | -0.36% | |
| Miami International Holdings Announces Date of Second Quarter 2026 Earnings Release and Conference Call | Press release | PR Newswire | -0.42% | +3.09% | |
| Miami International Holdings Reports June 2026 Trading Results | Press release | PR Newswire | +0.83% | +4.05% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Jun 17 | SEC filing · Form 8-K | SEC EDGAR | +0.17% | -0.36% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Jun 16 | SEC filing · Form 8-K | SEC EDGAR | +0.19% | -1.93% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Jun 15 | SEC filing · Form 8-K | SEC EDGAR | +0.74% | -0.19% | |
| Miami International Holdings Reports May 2026 Trading Results | Press release | PR Newswire | +0.27% | -5.11% | |
| Miami International Holdings Announces OCC Clearing and Settlement Agreement for MIAX Futures Exchange | Press release | PR Newswire | -1.72% | -2.95% | |
| OCC Begins Clearing for MIAX Futures Exchange | Press release | Business Wire | -1.72% | -2.95% | |
| Miami International Holdings Announces Launch of Tini Bloomberg 100 Index Futures on MIAX Futures | Press release | PR Newswire | -0.36% | -0.91% | |
| Miami International Holdings Announces Participation in Upcoming June Investor Conferences | Press release | PR Newswire | +0.64% | +1.14% | |
| Form 10-Q MIAMI INTERNATIONAL HOLD For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -1.35% | +4.08% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: May 06 | SEC filing · Form 8-K | SEC EDGAR | +0.20% | +2.62% | |
| Miami International Holdings Reports First Quarter 2026 Results | Press release | PR Newswire | +0.20% | +2.62% | |
| Miami International Holdings Reports Trading Results for April 2026 | Press release | PR Newswire | +0.20% | +2.62% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Apr 23 | SEC filing · Form 8-K | SEC EDGAR | +0.26% | +2.28% | |
| Form ARS MIAMI INTERNATIONAL HOLD For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.26% | +2.28% | |
| Form DEF 14A MIAMI INTERNATIONAL HOLD For: Jun 16 | SEC filing · Form DEF | SEC EDGAR | +0.26% | +2.28% | |
| Form DEFA14A MIAMI INTERNATIONAL HOLD | SEC filing · Form DEFA14A | SEC EDGAR | +0.26% | +2.28% | |
| MIAX Launches "Excellence in Every Exchange" Nationwide Advertising Campaign | Press release | PR Newswire | -1.08% | +1.73% | |
| Miami International Holdings Announces Date of First Quarter 2026 Earnings Release and Conference Call | Press release | PR Newswire | +0.38% | +0.90% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Apr 07 | SEC filing · Form 8-K | SEC EDGAR | -0.10% | +1.45% | |
| Miami International Holdings Announces the Passing of Board Member Murray Stahl | Press release | PR Newswire | -1.62% | -1.74% | |
| Miami International Holdings Reports Trading Results for March 2026 | Press release | PR Newswire | -0.40% | +3.40% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Mar 24 | SEC filing · Form 8-K | SEC EDGAR | -0.53% | -2.05% | |
| Form 10-K MIAMI INTERNATIONAL HOLD For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.01% | -2.10% | |
| Form S-8 MIAMI INTERNATIONAL HOLD | SEC filing · Form S-8 | SEC EDGAR | +0.01% | -2.10% | |
| Miami International Holdings Reports Trading Results for February 2026 | Press release | PR Newswire | -0.26% | +0.54% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Feb 25 | SEC filing · Form 8-K | SEC EDGAR | -1.11% | +3.35% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Feb 25 | SEC filing · Form 8-K | SEC EDGAR | -0.35% | +0.46% | |
| Miami International Holdings Reports Fourth Quarter and Full Year 2025 Financial Results | Press release | PR Newswire | -0.35% | +0.46% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Feb 18 | SEC filing · Form 8-K | SEC EDGAR | +0.32% | -2.43% | |
| MIAX Chairman and CEO Thomas P. Gallagher Named Chief Executive of the Year by FOW | Press release | PR Newswire | +0.26% | +1.08% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Feb 09 | SEC filing · Form 8-K | SEC EDGAR | +0.26% | +1.08% | |
| Miami International Holdings Announces Date of Fourth Quarter 2025 Earnings Release and Conference Call | Press release | PR Newswire | -0.12% | +0.54% | |
| Miami International Holdings Reports Trading Results for January 2026 | Press release | PR Newswire | -0.45% | +0.10% | |
| TISE Reports 2025 Listing Results; Sets Record New Listings During Milestone Year | Press release | PR Newswire | +0.26% | +2.28% | |
| Form 8-K MIAMI INTERNATIONAL HOLD For: Jan 20 | SEC filing · Form 8-K | SEC EDGAR | +0.47% | +0.29% | |
| Miami International Holdings Completes Sale of MIAXdx to Joint Venture Established by Robinhood Markets in Partnership with Susquehanna International Group | Press release | PR Newswire | +0.00% | +1.74% | |
| Miami International Holdings Reports Trading Results for December and Full-Year 2025 | Press release | PR Newswire | -0.58% | -0.19% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the MIAX section they belong to.
Where else MIAX is measured.
MIAX earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Miami International Holdings, Inc.'s median reaction calculated?
Every labeled MIAX news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 339 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 59% of MIAX's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does MIAX's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.