The OTC Bulletin Board (OTCBB) (link is external) is an electronic quotation system that displays real-time quotes, last-sale prices, and volume information for many over-the-counter securities that are not listed on a national securities exchange. Brokers who subscribe to the system can use the OTCBB to look up prices or enter quotes for OTC securities. Under the OTCBB’s eligibility rule, companies that want to have their securities quoted on the OTCBB must file current financial reports with the SEC or with their banking or insurance regulators.