Securities Exchange Act of 1934: Primary federal legislation governing securities markets and establishing the SEC. Key for margin account regulations.

Regulation T (12 CFR 220): Federal Reserve Board regulation governing margin requirements and initial margin lending.

Truth in Lending Act (Regulation Z): Federal law requiring disclosure of credit terms and standardizing calculation of credit costs.

Equal Credit Opportunity Act: Prohibits discrimination in credit transactions based on race, color, religion, national origin, sex, marital status, or age.

FINRA Rule 4210: Comprehensive margin requirements rule covering initial and maintenance margin requirements for various securities.

FINRA Rule 2264: Requires brokers to provide customers with specific disclosures about the risks of margin trading.

FINRA Rule 2341: Governs the sale and trading of investment company securities in margin accounts.

SEC Rule 15c3-1: Net Capital Requirements rule ensuring broker-dealers maintain sufficient liquid assets.

SEC Rule 15c3-3: Customer Protection Rule safeguarding customer securities and funds held by broker-dealers.

State Securities Regulations: State-specific rules governing securities transactions and margin lending within individual states.

State Usury Laws: State-specific limitations on interest rates and charges that can be applied to margin loans.

State Consumer Protection Laws: State-specific regulations protecting consumers in financial transactions.

Bank Secrecy Act: Requires financial institutions to assist government agencies in detecting and preventing money laundering.

Anti-Money Laundering Regulations: Federal requirements for financial institutions to maintain programs preventing money laundering.

Know Your Customer Requirements: Regulatory requirements for verifying customer identity and assessing risk in financial relationships.

CFPB Guidelines: Consumer Financial Protection Bureau guidelines for consumer lending and financial services.