1. Regulating Securities Markets: The SEC regulates stock exchanges, brokerage firms, and other securities markets to ensure they operate fairly. 2. Enforcing Securities Laws: The agency investigates and prosecutes securities fraud and other violations. 3. Reviewing Corporate Filings: Companies that are publicly traded must file regular reports, which the SEC reviews to ensure compliance with laws. 4. Protecting Investors: The SEC provides resources and education to help investors make informed decisions.