NEW YORK, December 31, 2025, 12:19 ET — Regular session.
- MIAX shares fell about 2% in midday trading, with no fresh company news flagged.
- Investors remain focused on post-offering share overhang and short-interest positioning into 2026.
- Next catalysts include the company’s next earnings release window and early-2026 trading-volume updates.
Miami International Holdings, Inc. shares were down 2.2% on Wednesday midday, a softer tape in thin, year-end trading for the exchange operator.
The stock last traded at $44.70, down $0.99 from the previous close, after moving between $44.05 and $46.00 in the session. 1 1
Why it matters now: MIAX has become a closely watched “picks-and-shovels” bet on derivatives activity — and into the final sessions of the year, investors often focus less on new headlines and more on positioning, liquidity and supply-demand shifts in recently listed names. 7
There were no new MIAX earnings, guidance changes, or M&A announcements in the past day that clearly explained the move, based on the company’s posted releases and filings. 2 2
Instead, traders pointed to lingering share-supply questions after MIAX’s December secondary public offering, which increased tradable stock without raising new capital for the company because shares were sold by existing holders, the company said at the time. 3 3
Short-interest data has also been on screens. MIAX short interest stood at about 2.01 million shares as of the Dec. 15 settlement date, or roughly 2.6% of float, according to market data compiled by Finviz. 4 4
A separate MarketBeat note published this week flagged an increase in reported short interest, though the stock has remained range-bound since late December. 5 5
Peers were mixed in recent sessions as investors weighed the outlook for volatility and options volumes heading into the new year, a key driver for exchange operators including Cboe Global Markets, Nasdaq and Intercontinental Exchange.
For MIAX specifically, investors have tended to watch monthly and quarterly trading metrics alongside headline volatility indicators, because options and related market-data products can benefit when trading activity rises.
What traders are watching next is calendar-driven: the next earnings date remains a key near-term catalyst, with one widely followed earnings calendar pegging MIAX’s next report in late February 2026. 6 6
