Interactive Brokers Group, Inc. filed a Form 8-K on July 31, 2026, disclosing the filing of a Prospectus Supplement under Rule 424(b)(5) to register up to 920,000 shares of its common stock from an existing shelf Registration Statement.

Key Highlights

  • Shares registered: Up to 920,000 shares of common stock, par value $0.01 per share, registered via a Prospectus Supplement under Rule 424(b)(5).
  • Shelf registration: The supplement was filed under Registration Statement on Form S-3, Registration Statement No. 333-297857, filed with the SEC on July 31, 2026.
  • Legal opinion: Dechert LLP, counsel to the company, provided a legal opinion letter regarding the validity of the shares, filed as Exhibit 5.3.
  • Incorporation by reference: The legal opinion letter is incorporated by reference into the Registration Statement as Exhibit 5.3.
  • Signatory: The filing was signed by Paul J. Brody, Chief Financial Officer, Treasurer and Secretary, on July 31, 2026.

Interactive Brokers Registers 920,000 Common Shares Under Existing Shelf Statement

According to the Form 8-K filed on July 31, 2026, Interactive Brokers Group, Inc. (NASDAQ: IBKR) disclosed that it filed a Prospectus Supplement under Rule 424(b)(5) to register up to 920,000 shares of its common stock. The company stated the supplement was filed under its shelf Registration Statement on Form S-3, bearing Registration Statement No. 333-297857, which the company reported was also filed with the SEC on July 31, 2026.

The filing noted that Dechert LLP, identified as counsel to the company, issued a legal opinion letter addressing the validity of the shares to be registered. The company disclosed that this opinion letter was filed as Exhibit 5.3 to the Current Report on Form 8-K and was incorporated by reference into the Registration Statement as Exhibit 5.3 thereto. No offering price, use of proceeds, or underwriting terms were specified within the body of the 8-K itself.

The company is incorporated in Delaware and is headquartered at One Pickwick Plaza, Greenwich, Connecticut 06830. The filing was executed by Paul J. Brody in his capacity as Chief Financial Officer, Treasurer and Secretary. Interactive Brokers Group, Inc. confirmed it is not an emerging growth company as defined under applicable Securities Act and Exchange Act rules.

What Was Disclosed

The company disclosed the filing of a Prospectus Supplement to register up to 920,000 shares of common stock under an existing shelf registration statement, along with an accompanying legal opinion from Dechert LLP on share validity.