MIAX slides 7.8% as ownership reshuffling adds apparent supply overhang

Miami International Holdings, Inc. (MIAX) is down 7.8% today. Here is some analysis on what might have caused this price movement.

Analysis: The move appears tied to near-term supply/positioning rather than a new operating setback. Recent SEC ownership filings show a large holder distributing shares in-kind to underlying clients, which can create an overhang as recipients rebalance, and the company also presented at an investor conference today where emphasis on aggressive pricing and continued investment may have sparked some profit-taking.

Details:

A major shareholder disclosed an in-kind, pro rata distribution of MIAX shares to the beneficial owners of managed accounts, a non-cash change that can still increase effective float as recipients decide whether to hold or sell.

An amended ownership filing showed the same holder reporting 7,400,316 shares, or 7.8% of MIAX outstanding shares, following the restructuring described in the filing.

Company leadership presented at the William Blair Growth Stock Conference on June 2, 2026; commentary highlighted efforts to drive share gains via aggressive fee strategy while continuing build-out in futures and new products, which could be read as near-term margin investment.

This could also be amplified by technical factors after a volatile session and heavy volume, with incremental selling pressure having an outsized impact on a recently public mid-cap name.

Sources:

SEC, MIAX Investor Relations, StockAnalysis.com

Disclaimer: This price movement analysis was generated with the help of AI. Please double-check the information provided for mistakes.

$MIAX Insider Trading Activity

$MIAX insiders have traded $MIAX stock on the open market 27 times in the past 6 months. Of those trades, 3 have been purchases and 24 have been sales.

Here’s a breakdown of recent trading of $MIAX stock by insiders over the last 6 months:

THOMAS P. GALLAGHER (Chairman & CEO) has made 0 purchases and 4 sales selling 278,254 shares for an estimated $12,292,554.
MURRAY STAHL has made 3 purchases buying 16,839 shares for an estimated $722,511 and 1 sale selling 121,054 shares for an estimated $4,953,529.
DOUGLAS M. JR SCHAFER (EVP and CIO) has made 0 purchases and 2 sales selling 96,000 shares for an estimated $4,175,520.
BARBARA J. COMLY (EVP, GC & Corporate Secretary) has made 0 purchases and 2 sales selling 57,667 shares for an estimated $2,617,947.
SHELLY BROWN (EVP, Chief Strategy Officer) has made 0 purchases and 5 sales selling 61,623 shares for an estimated $2,603,143.
LANCE EMMONS (EVP and CFO) sold 35,000 shares for an estimated $1,972,600
KURT M. ECKERT has made 0 purchases and 2 sales selling 43,542 shares for an estimated $1,744,769.
EDWARD DEITZEL (EVP, CRO, CCO MIAX Exchanges) has made 0 purchases and 4 sales selling 23,335 shares for an estimated $1,038,301.
JUDSON GRAY TEEKELL has made 0 purchases and 3 sales selling 6,000 shares for an estimated $261,900.

To track insider transactions, check out Quiver Quantitative's insider trading dashboard. You can access data on insider stock transactions through the Quiver Quantitative API insider transaction endpoint.

$MIAX Hedge Fund Activity

We have seen 163 institutional investors add shares of $MIAX stock to their portfolio, and 71 decrease their positions in their most recent quarter.

Here are some of the largest recent moves:

T. ROWE PRICE INVESTMENT MANAGEMENT, INC. removed 1,920,589 shares (-79.0%) from their portfolio in Q4 2025, for an estimated $85,235,739
HORIZON KINETICS ASSET MANAGEMENT LLC added 1,631,751 shares (+89.7%) to their portfolio in Q1 2026, for an estimated $63,507,748
CITADEL ADVISORS LLC added 988,200 shares (+159.5%) to their portfolio in Q1 2026, for an estimated $38,460,744
MORGAN STANLEY added 926,077 shares (+419.3%) to their portfolio in Q1 2026, for an estimated $36,042,916
INVESCO LTD. added 820,246 shares (+178.8%) to their portfolio in Q4 2025, for an estimated $36,402,517
TWO SIGMA INVESTMENTS, LP added 753,387 shares (+536.9%) to their portfolio in Q1 2026, for an estimated $29,321,822
JANE STREET GROUP, LLC removed 638,050 shares (-100.0%) from their portfolio in Q1 2026, for an estimated $24,832,906

To track hedge funds' stock portfolios, check out Quiver Quantitative's institutional holdings dashboard. You can access data on hedge funds moves and 13F filings through the Quiver Quantitative API 13F endpoint.

$MIAX Congressional Stock Trading

Members of Congress have traded $MIAX stock 1 times in the past 6 months. Of those trades, 1 have been purchases and 0 have been sales.

Here’s a breakdown of recent trading of $MIAX stock by members of Congress over the last 6 months:

REPRESENTATIVE GILBERT RAY CISNEROS, JR. purchased up to $50,000 on 03/20.

To track congressional stock trading, check out Quiver Quantitative's congressional trading dashboard. You can access data on congressional stock trades through the Quiver Quantitative API Congress trades endpoint.

$MIAX Analyst Ratings

Wall Street analysts have issued reports on $MIAX in the last several months. We have seen 1 firms issue buy ratings on the stock, and 0 firms issue sell ratings.

Here are some recent analyst ratings:

Rosenblatt issued a "Buy" rating on 12/09/2025

To track analyst ratings and price targets for $MIAX, check out Quiver Quantitative's $MIAX forecast page.

$MIAX Price Targets

Multiple analysts have issued price targets for $MIAX recently. We have seen 4 analysts offer price targets for $MIAX in the last 6 months, with a median target of $49.0.

Here are some recent targets:

Chris Allen from Keefe, Bruyette & Woods set a target price of $48.0 on 05/08/2026
Chris Brendler from Rosenblatt set a target price of $61.0 on 05/07/2026
Kenneth Worthington from JP Morgan set a target price of $45.0 on 05/07/2026
Michael Cyprys from Morgan Stanley set a target price of $50.0 on 04/10/2026

This article is not financial advice. See Quiver Quantitative's disclaimers for more information. Note that there may be inaccuracies due to mistakes in ticker-mapping, and other anomalies.