Gallagher Thomas P. sold $3.0M of MIAX (indirect holdings)
Gallagher Thomas P. (Chairman & CEO) sold 70,000 indirectly-held shares of MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) at $42.52 ($2.98M total) on 2026-07-13 under a Rule 10b5-1 trading plan.
How this was made
The 30-second read
Why it matters
The only new fact is the reported open-market sale amount, price, and 10b5-1 status; it does not include any operational or financial update for MIAX.
Market read
Traders may monitor for follow-on insider activity, but this specific disclosure is unlikely to change MIAX fundamentals.
What to watch
The filing notes indirect holdings and post-transaction share count, but provides no context on total planned sales, remaining tranche size, or whether other insiders are selling or buying.
Background
The article is a primary-source SEC Form 4 insider transaction for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX).
Ticker impact
MIAX Form 4 shows Chairman and CEO Thomas P. Gallagher sold 70,000 shares at $42.52 on a 10b5-1 plan, totaling about $2.98M.
Low likelihood of a sustained price move; any impact is likely short-lived and sentiment-driven.
The filing is a routine insider transaction with stated 10b5-1 pre-arrangement, and it does not disclose new company fundamentals, guidance, or regulatory outcomes.
Market effects
Minimal, as the disclosure is company-specific and does not indicate broader sector developments.
None indicated; transaction is not tied to macro or regional events.
None indicated; no cross-border deal, regulation, or supply-chain impact is described.
Counterpoint
Because the sale is explicitly under a 10b5-1 plan, it may reflect scheduled liquidity needs rather than bearish expectations, so traders may ignore it for directional bets.
Key entities
- issuerMIAMI INTERNATIONAL HOLDINGS, INC.
Subject of the Form 4 insider transaction; Chairman and CEO Thomas P. Gallagher sold shares under a 10b5-1 plan.
- insiderGallagher Thomas P.
Chairman and CEO who executed the reported sale of 70,000 shares at $42.52.
