Dear Prospective Investor

IBKR aims to provide an exceptionally inexpensive and versatile platform for our clients to manage their finances.

It is vitally important to us that our clients be better equipped, pay lower prices, and have other advantages so as to generate higher returns than the customers of other brokers.

In part, we achieve these goals by getting frequent feedback and advice, and by otherwise working with our users. Owning our shares provides increased motivation for our clients to work with us toward these goals.

Investment by passive investors, and by others who do not use our platform, tends to cause a run up in our share price. This makes it more difficult for our clients to purchase our shares.

You may be considering investing in IBKR. We would like to ask you not to buy our shares unless you become an active user of our platform prior to doing so.

Sincerely yours,

Thomas Peterffy

Monthly Metrics

Monthly Brokerage Metrics

For December 2019

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January 2, 2020

Reports

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2018 Annual Report

Results, Webcasts and Filings

Earnings Release

4th Quarter Earnings: January 21, 2020

Listen to Webcast

4^th Quarter Earnings Call: January 21, 2020 - 4:30pm ET

SEC Filings

10-Q, 8-K, Form 4, DEF 14A, S8

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Presentations

Goldman Sachs US Financial Services Conference: December 11^th 2019

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Baird Global Consumer, Technology & Services Conference: June 6^th 2019

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Sandler O'Neill Global Exchange and Brokerage Conference: June 5^th 2019

Press Release|Investor Presentation|Listen to Webcast

Goldman Sachs US Financial Services Conference: December 5^th 2018

Press Release|Investor Presentation|Listen to Webcast

Sandler O'Neill Global Exchange and Brokerage Conference: June 6^th 2018

Press Release|Investor Presentation