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 March 2018

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April 2, 2018

Reports

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2017 Annual Report

Results, Webcasts and Filings

Earnings Release

1st Quarter Earnings: April 17, 2018

Listen to Webcast

1^st Quarter Earnings Call: April 17, 2018 - 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 6^th 2017

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Sandler O'Neill Global Exchange and Brokerage Conference: June 7^th 2017

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Goldman Sachs US Financial Services Conference: December 7^th 2016

Press Release|Investor Presentation|Listen to Webcast

Interactive Brokers July 2016 Investor Presentation

Press Release|Investor Presentation

Sandler O'Neill Global Exchange and Brokerage Conference: June 3^rd 2015

Press Release|Investor Presentation|Listen to Webcast