Horizon Kinetics Asset Management Reports $55M Net Share Purchases, Updates on Director's Passing
MIAX sits 52% above its 52-week low of $28.63 on light trading volume (0.2× avg).
Summary
Horizon Kinetics Asset Management, a 10% owner, reported net purchases of approximately $55.3 million in Miami International Holdings shares over the last 60 days, alongside an update regarding the passing of director Murray Stahl.
Key Events · Ownership and Investor Activity · MIAX
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Significant Net Share Purchases
Horizon Kinetics Asset Management LLC's managed accounts made net purchases of approximately 1.4 million shares, valued at about $55.3 million, over the past 60 days, indicating a significant investment.
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Update on Director's Passing
The filing formally acknowledges the passing of Murray Stahl on April 7, 2026, who served as a Director of Miami International Holdings and was Chairman, CEO, and CIO of Horizon Kinetics Asset Management LLC. This follows the company's prior 8-K disclosure on April 9, 2026.
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Maintained 12.1% Ownership Stake
Horizon Kinetics Asset Management LLC continues to beneficially own 11,061,399 shares of common stock, representing 12.1% of the outstanding shares as of April 9, 2026.
Analysis · MIAX · Crypto Assets
This Schedule 13D/A from Horizon Kinetics Asset Management LLC (HKAM), a 10% owner and investment adviser, provides an update following the recent passing of Murray Stahl, who was a director of Miami International Holdings and a key executive at HKAM. While the passing of Mr. Stahl was previously disclosed by the company in an 8-K on April 9, 2026, this filing reveals significant net share purchases by HKAM's managed accounts totaling approximately $55.3 million over the past 60 days. This substantial buying activity indicates continued confidence from a major institutional investor despite the recent leadership change. Investors should note the ongoing accumulation by this significant shareholder.
How filings like this one have moved
In the 30 days to Sep 17, 2026, 29.6% of the 1742 measured filings Wiseek scored 7 moved their stock by 5% or more by the next session's close. The median move was -0.35%. These are measured outcomes after filings of this importance, not a forecast for this one.
Measured one observation per ticker per day, after exclusions. Current figures: Filing Impact Tracker · open dataset
At the time of this filing, MIAX was trading at $43.48 on NYSE in the Crypto Assets sector, with a market capitalization of approximately $4B. The 52-week trading range was $28.63 to $51.38. This filing was assessed with positive market sentiment and an importance score of 7 out of 10.