SCHEDULE 13G/A 0001340807 XXXXXXXX LIVE 5 Common Stock 10/31/2025 0001381197 Interactive Brokers Group, Inc. 45841N107 ONE PICKWICK PLAZA GREENWICH CT 06830 Rule 13d-1(b) Bares Capital Management, Inc. b X1 IA Interactive Brokers Group, Inc. ONE PICKWICK PLAZA, GREENWICH, CONNECTICUT, 06830 Bares Capital Management, Inc. 12600 Hill Country Blvd., Suite R-230 Austin, TX 78669 USA N IA Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Bares Capital Management, Inc. James J. Creel Jr. 11/07/2025