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Insider Trading Arrangements (Details)
 3 Months Ended
Sep. 30, 2025
shares
Insider Trading Arrangements [Line Items]  
Material Terms of Trading Arrangement [Text Block] Rule 10b5-1 Trading Plans

The following table discloses the adoption of Rule 10b5-1 trading plans for the sale of shares of our common stock by our directors and officers (as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended) during the three months ended September 30, 2025, each of which is intended to satisfy the affirmative defense conditions of Rule 10b-51(c) under the Exchange Act.

Name

Title

Plan Adoption and/or Termination

Plan Adoption Date

Plan Expiration Date

Purchase or Sale

Aggregate Number of IBKR shares to be Sold

Thomas Peterffy

Chairman of the Board of Directors

Adoption

July 30, 2025

February 8, 2026 1

Sale

6,064,728 2

________________________

1.Or upon the earlier completion of all authorized transactions under the plan.

2.Shares held through Conyers Investments LLC, which is indirectly wholly owned by Thomas Peterffy. Mr. Peterffy is also a manager of Conyers Investments LLC with the unilateral power to vote or sell the shares.

Other than as disclosed above, no other director or officer adopted, modified or terminated a contract, instruction or written plan for the purchase or sale of our securities intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or a “non-Rule 10b5-1 trading arrangement”, as defined in Item 408(c) of Regulation S-K.
Thomas Peterffy [Member]  
Insider Trading Arrangements [Line Items]  
Trading Arrangement, Individual Name Thomas Peterffy
Trading Arrangement, Individual Title Chairman of the Board of Directors
Rule 10b5-1 Arrangement Adopted [Flag] true
Trading Arrangement, Securities Aggregate Available Amount 6,064,728
Trading Arrangement Adoption Date July 30, 2025