Interactive Brokers Group, Inc.

SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Purchases of IBG LLC membership interests, held by Holdings, by the Company are governed by the Amended Exchange Agreement, which was filed on Exhibit 10.1 to the Quarterly Report on Form 10-Q for Quarterly Period Ended September 30, 2015 filed by the Company on November 9, 2015. At the time of the Company’s IPO in 2007, three hundred sixty (360) million shares, 1.440 billion shares on a post-split basis, of authorized common stock were reserved for future sales and redemptions.

On an annual basis, each holder of a membership interest may request that some or all of that holder’s interest be redeemed by Holdings. We expect Holdings to use the net proceeds it receives from such sales to redeem an identical number of Holdings membership interests from the requesting holders.

With the consent of Holdings and the Company (on its own behalf and acting as the sole managing member of IBG LLC), IBG LLC agreed in July 2025 to redeem certain membership interests from Holdings through the sale of common stock and the distribution of the proceeds of such sale to the beneficial owners of such membership interests.

On July 30, 2025, the Company filed a Prospectus Supplement on Form 424B5 with the SEC to issue 3,836,000 shares of common stock (with a fair value of $254 million) in exchange for an equivalent number of shares of member interest in IBG LLC. The acquired shares were distributed in-kind to the members of Holdings who elected to redeem a portion of their Holdings membership interests.

ITEM 3. DEFAULTS