Gallagher Thomas P. — SEC Form 4 Insider Trading Activity

Summary

Updated Jul 16, 2026

Gallagher Thomas P. has filed 8 SEC Form 4 filings across 1 company in the last 90 days — active on both sides. Lifetime open-market purchases: $276K. Lifetime open-market sales: $21.94M.

Profile

Gallagher Thomas P.

Thomas P. Gallagher is the Chairman and CEO of Miami International Holdings, Inc., a company known for operating regulated financial marketplaces. He has played a significant role in the development and management of the MIAX Exchange, leveraging proprietary technology to enhance trading across various asset classes.

RoleChairman & CEO, Director
Notability50/100

Board memberships

Awards & honors

Recent Transactions

DateTickerCompanyCodeSharesPriceValue
2026-07-14MIAXMIAMI INTERNATIONAL HOLDINGS, INC.S — Open-market sale [10b5-1]70.0K$42.52$2.98M
2026-07-14MIAXMIAMI INTERNATIONAL HOLDINGS, INC.M — Option exercise [10b5-1]70.0K$12.00$840K
2026-07-07MIAXMIAMI INTERNATIONAL HOLDINGS, INC.S — Open-market sale28.2K$42.27$1.19M
2026-07-07MIAXMIAMI INTERNATIONAL HOLDINGS, INC.M — Option exercise28.2K$12.00$339K
2026-07-07MIAXMIAMI INTERNATIONAL HOLDINGS, INC.S — Open-market sale41.8K$42.09$1.76M
2026-07-07MIAXMIAMI INTERNATIONAL HOLDINGS, INC.M — Option exercise41.8K$12.00$501K
2026-06-18MIAXMIAMI INTERNATIONAL HOLDINGS, INC.A — Grant or award233.0K$0.00
2026-06-04MIAXMIAMI INTERNATIONAL HOLDINGS, INC.S — Open-market sale70.0K$42.36$2.97M
2026-06-04MIAXMIAMI INTERNATIONAL HOLDINGS, INC.M — Option exercise70.0K$12.00$840K
2026-05-13MIAXMIAMI INTERNATIONAL HOLDINGS, INC.M — Option exercise25.0K$12.00$300K
2026-05-07MIAXMIAMI INTERNATIONAL HOLDINGS, INC.S — Open-market sale15.8K$47.92$756K
2026-05-07MIAXMIAMI INTERNATIONAL HOLDINGS, INC.M — Option exercise15.8K$12.00$189K
2026-05-05MIAXMIAMI INTERNATIONAL HOLDINGS, INC.S — Open-market sale54.2K$47.26$2.56M
2026-05-05MIAXMIAMI INTERNATIONAL HOLDINGS, INC.M — Option exercise54.2K$12.00$651K
2026-04-17MIAXMIAMI INTERNATIONAL HOLDINGS, INC.S — Open-market sale49.9K$43.68$2.18M
2026-04-17MIAXMIAMI INTERNATIONAL HOLDINGS, INC.S — Open-market sale104.1K$43.36$4.51M
2026-04-17MIAXMIAMI INTERNATIONAL HOLDINGS, INC.S — Open-market sale70.0K$43.36$3.04M
2026-04-17MIAXMIAMI INTERNATIONAL HOLDINGS, INC.M — Option exercise70.0K$12.00$840K
2026-04-01MIAXMIAMI INTERNATIONAL HOLDINGS, INC.F — Tax withholding / forfeiture20.9K$37.50$783K
2026-02-12MIAXMIAMI INTERNATIONAL HOLDINGS, INC.F — Tax withholding / forfeiture50.1K$41.33$2.07M

Companies — Last 90 Days

Frequently Asked Questions

Who is Gallagher Thomas P.?

Thomas P. Gallagher is the Chairman and CEO of Miami International Holdings, Inc., a company known for operating regulated financial marketplaces. He has played a significant role in the development and management of the MIAX Exchange, leveraging proprietary technology to enhance trading across various asset classes.…

How many SEC Form 4 filings has Gallagher Thomas P. submitted recently?

8 primary Form 4 filings in the last 90 days, covering 1 company.

Has Gallagher Thomas P. been buying or selling stock?

Recorded transactions: 1 open-market purchases ($276K) and 9 open-market sales ($21.94M) across all tracked filings.

Where can I see all of Gallagher Thomas P.'s SEC filings?

All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.

Learn More

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