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Regulatory Requirements | 9 Months Ended
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Sep. 30, 2025
Regulatory Requirements [Abstract] |
Regulatory Requirements | 15. Regulatory Requirements As of September 30, 2025, aggregate excess regulatory capital for all operating subsidiaries was $13.7 billion. IB LLC, IBKRSS and IB Corp. are subject to the Uniform Net Capital Rule (Rule 15c3-1) under the Exchange Act. IB LLC is also subject to the CFTC’s minimum financial requirements (Regulation 1.17). IBC is subject to the Canadian Investment Regulatory Organization risk-adjusted capital requirement. IBKRFS is subject to the Swiss Financial Market Supervisory Authority eligible equity requirement, IBUK is subject to the United Kingdom Financial Conduct Authority Capital Requirements Directive, IBIE is subject to the Central Bank of Ireland financial resources requirement, IBI is subject to the National Stock Exchange of India net capital requirements, IBHK is subject to the Hong Kong Securities Futures Commission liquid capital requirement, IBSJ is subject to the Japanese Financial Supervisory Agency capital requirements, IBSG is subject to the Monetary Authority of Singapore capital requirements, and IBA is subject to the Australian Securities Exchange liquid capital requirement. The table below summarizes capital, capital requirements and excess regulatory capital as of September 30, 2025.
|  | Net Capital/ |  |  |  |  |  |
|  | Eligible Equity |  | Requirement |  | Excess
|  | (in millions)
IB LLC |  | $ | 10,443 |  | $ | 1,628 |  | $ | 8,815
IBHK |  |  | 1,553 |  |  | 592 |  |  | 961
IBIE |  |  | 1,696 |  |  | 382 |  |  | 1,314
Other regulated operating subsidiaries |  |  | 2,780 |  |  | 179 |  |  | 2,601
|  | $ | 16,472 |  | $ | 2,781 |  | $ | 13,691
Regulatory capital requirements could restrict the operating subsidiaries from expanding their business and declaring dividends if their net capital does not meet regulatory requirements. Also, certain operating subsidiaries are subject to other regulatory restrictions and requirements. As of September 30, 2025, all regulated operating subsidiaries were in compliance with their respective regulatory capital requirements.

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- Definition The entire disclosure of the regulatory capital requirements imposed on the entity's Operating Companies. + References No definition available. + Details
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