Denis Mendonca - 31 Dec 2025 Form 4 Insider Report for Interactive Brokers Group, Inc. (IBKR)

Role: Chief Accounting Officer
Signature: /s/ Denis Mendonca
Issuer symbol: IBKR
Transactions as of: 31 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 07 Jan 2026, 16:01:05 UTC
Previous filing: 03 Jun 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Mendonca Denis	Chief Accounting Officer	ONE PICKWICK PLAZA, GREENWICH	/s/ Denis Mendonca	07 Jan 2026	0001665345

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IBKR	Class A common stock	Award	$0	+11,156	+7.7%	$0.000000	156,228	31 Dec 2025	Direct	F1, F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.
F2	On June 17, 2025, the issuer effected a four-for-one split of its common stock, resulting in the Reporting Person's indirect ownership of 108,804 additional shares of common stock.
F3	This amount includes (a) Class A common stock attributable to vested restricted stock units that were awarded under the Plan and (b) unvested restricted stock units that were awarded under the Plan.