INTERACTIVE BROKERS GROUP, INC. (NASDAQ:IBKR) Files An 8-K Other Events
Item 8.01 Other Events.

Adoption of Rule 10b5-1 Trading Plans

IBG Holdings LLC (“Holdings”) has adopted trading plans effective July 28, 2017. Holdings owns shares of Class A common stock of Interactive Brokers Group, Inc. (“IBKR” or the “Company”) for the benefit of certain of its members, who include Paul J. Brody, Chief Financial Officer and Director of the Company, Earl H. Nemser, Vice Chairman of the Company, Thomas A.J. Frank, Executive Vice President of the Company, and certain employees of the Company and its subsidiaries. Thomas Peterffy, the Company’s Chairman and Chief Executive Officer, has voting control of Holdings, but has no economic interest in the shares to be sold under the plans. The plansaredesigned to comply with guidelines specified under Rule 10b5-1 of the Exchange Act.

The trading plans were adopted in order to allow Holdings to sell the shares of IBKR stock received to the Company’s purchase of IBG LLC shares from Holdings, as more fully described in the prospectus supplement filed with the Securities and Exchange Commission (“SEC”) on July 28, 2017, and to sell shares of IBKR stock which were acquired on July 28, 2016, to the Company’s purchase of IBG LLC shares from Holdings as more fully described in the prospectus supplement filed with the SEC on July 28, 2016. Under the terms of the trading plans, Holdings intends to sell 2,301,060 shares of Class A common stock over time at prevailing market prices, which includes the 1,214,860 shares acquired on July 28, 2017 and 1,086,200 shares which were acquired on July28, 2016 that were not sold to trading plans executed in 2016 and are still owned by Holdings. The transactions will occur until the earlier of the date on which all shares are sold, the plansareterminated in accordance with theirterms and Rule 10b5-1 of the Exchange Act or July 24, 2018and will be disclosed publicly in accordance with applicable securities laws, rules and regulations through appropriate filings with the Securities and Exchange Commission, as applicable. Holdings and its members will have no control over the stock sales under the trading plans.

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About INTERACTIVE BROKERS GROUP, INC. (NASDAQ:IBKR)

Interactive Brokers Group, Inc. (IBG, Inc.) is a holding company. The Company is an automated global electronic broker and market maker specializing in routing orders, and executing and processing trades in securities, futures, foreign exchange instruments, bonds and mutual funds on over 100 electronic exchanges and trading venues around the world. It operates in two segments: electronic brokerage and market making. Its primary assets are its membership interests of IBG LLC (the Group), the holding company for its businesses. The Company is the sole managing member of IBG LLC. As a direct market access broker, the Company serves the customers of both traditional brokers and prime brokers. It provides its customers with order management, trade execution and portfolio management platform. As a market maker, it provides continuous bid and offer quotations on over one million securities and futures products listed on electronic exchanges around the world.