You can find the FINRA Margin Rule 4210 on the FINRA website.
Where can I find the FINRA Margin Rule 4210?
Powered by IBot
Where can I find the FINRA Margin Disclosure Statement?
Where can I find the IBKR Disclosure of Risks for Margin Trading?
Where can I find SIPC information from FINRA?
What is the FINRA Tick Size Pilot Program?