You can find the US Federal Reserve’s Credit By Brokers and Dealers rule (Regulation T) on the electronic Code of Federal Regulations website.
Where can I find the US Federal Reserve's Credit By Brokers and Dealers rule (Regulation T)?
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What is Interactive Brokers' Legal Entity Identifier (LEI)?
What are the key constraints for trading in a Reg-T account at Interactive Brokers?
Where can I find the US Federal Reserve Margin Supplemental "Free Riding" Rules?
Where can I find the CFTC Futures Risk Disclosures Statement?