The Municipal Securities Rulemaking Board (MSRB) is a self-regulatory organization established in 1975 to protect investors and promote a fair municipal securities market. It regulates broker-dealers, banks, and municipal advisors, setting rules to prevent fraud and ensure transparency. MSRB offers educational resources, market data through its EMMA platform, and regulatory oversight. Its target audience includes investors, municipal entities, and financial professionals. The unique selling proposition is its role as a central authority ensuring integrity and efficiency in the municipal securities market, safeguarding nearly $4 trillion in investments[1][3][5].