Item 8.01. Other Events.

On July 30, 2021, Dr. Thomas A.J. Frank, Executive Vice President and Chief Information Officer of Interactive Brokers Group, Inc. (the "Company"), adopted a Rule 10b5-1 trading plan to sell 2,000,000 of the Company's Class A common stock received in partial redemption of his interests in IBG Holdings LLC as more fully described in the prospectus supplement filed on Form 424b5 (File No. 333-240121) (the "Prospectus Supplement") with the Securities and Exchange Commission ("SEC") on July 30, 2021. Dr. Frank entered into the plan as part of his personal long-term investment strategy for tax, asset diversification and liquidity.

Under the terms of the plan, Dr. Frank intends to sell the shares of the Company's Class A common stock over time at prevailing market prices, subject to the terms of the plan and SEC Rule 144. Dr. Frank will not have any control over the timing of the stock sales under the plan. The transactions will occur until the earlier of the date on which all shares are sold, July 20, 2022 or the plan is terminated in accordance with its terms and applicable laws. All transactions under the plan will be disclosed in accordance with applicable securities laws, rules and regulations through appropriate filings with the SEC, as applicable.

Item 9.01. Financial Statements and Exhibits



 (d) Exhibits

Exhibit
Number                                   Description

  104     Cover Page Interactive Data File (the cover page XBRL tags are embedded
          within the Inline XBRL Document).


(*) Filed herewith.

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