Interactive Brokers Group, Inc. operates as an automated electronic broker in the United States and internationally. The company engages in the execution, clearance, and settlement of trades in stocks, options, futures, foreign exchange instruments, bonds, mutual funds, exchange traded funds (ETFs), precious metals, and cryptocurrencies. It also offers custody and service accounts for hedge and mutual funds, ETFs, registered investment advisors, proprietary trading groups, introducing brokers, and individual investors. In addition, the company provides custody, prime brokerage, securities, and margin lending services. It serves institutional and individual customers through electronic exchanges and market centers. Interactive Brokers Group, Inc. was founded in 1977 and is headquartered in Greenwich, Connecticut.

Investor	Date	% Owned	Market Value	Shares	Chg. Shares	Chg. Shares %	% Portfolio
The Vanguard Group, Inc.	2025-09-30	11.86873%	$3.64B	52.9M	11.0M	26.4%	0.0%
BlackRock, Inc.	2025-09-30	6.94849%	$2.13B	30.9M	-9.3M	-23.0%	0.0%
State Street Global Advisors, Inc.	2025-09-30	4.18731%	$1.28B	18.6M	3.5M	23.3%	0.0%
Vanguard Index Funds - Vanguard Total Stock Market ETF	2025-10-31	2.98235%	$913.96M	13.3M	-37.1K	-0.3%	0.0%
Cantillon Capital Management LLC	2025-09-30	2.84352%	$871.41M	12.7M	-139.6K	-1.1%	4.2%
Kayne Anderson Rudnick Investment Management, LLC
Vanguard Index Funds - Vanguard S&P 500 ETF
Wellington Management Group LLP
Greenwich Wealth Management, LLC
Geode Capital Management, LLC
Orbis Investment Management Limited
Vanguard Index Funds - Vanguard Mid-Cap ETF
JP Morgan Asset Management
Egerton Capital (UK) LLP
FMR LLC
Thomas Pechy Peterffy
American Century Investment Management Inc
Fidelity Concord Street Trust - Fidelity 500 Index Fund
iShares Trust - iShares Core S&P 500 ETF
Government Pension Fund Global

Interactive Brokers Group, Inc.

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