The stock market has many different regulators. The primary regulator is the Securities and Exchange Commission. The stock markets are governed by their own organizations, under the direction of the SEC. Stock brokers and brokerage firms are regulated by the Financial Industry Regulatory Authority (FINRA) which was formerly known as the National Association of Securities Dealers (NASD). In addition, each state has its own securities commission, which regulates the issuance, purchase and sale of securities in their jurisdictions.
For an introduction to the Federal Securities laws see Introduction to the Federal Securities Laws
For an introduction to the State Securities Laws, see Introduction to the Blue Sky Laws
For a list of state regulators, and their securities laws, see State Securities Law Administrators
The State Securities Administrators have their own organization – the North American Securities Administrators Association (NASAA)