Item 5. OTHER INFORMATION

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.

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