What must a market maker file to begin quoting a security on the OTCBB?

To begin quoting a security on the Over-The-Counter Bulletin Board (OTCBB), a market maker must file Form 211 with FINRA. This form is crucial as it notifies the FINRA that the market maker intends to quote a specific security and provides pertinent information about the security and the company issuing it. The filing of Form 211 ensures that the security meets the necessary regulatory and financial standards for quotation on the OTCBB.

The process includes the submission of details such as information about the issuer, including its business operations, financial condition, and other disclosures that allow for proper due diligence by that market maker and by potential investors. This requirement helps to maintain a level of transparency and integrity in the OTC market.

Other forms mentioned serve different purposes and are not appropriate for this specific function. For instance, Form 144 is used for the resale of restricted securities, Form 10-K is a comprehensive annual report filed by public companies, and Form S-1 is used for the registration of securities for public offerings. None of these forms are related to the initiation of quoting a security on the OTCBB, which emphasizes the importance of Form 211 in this context.