OTC Markets Group, (previously known as "Pink Sheets") is a United States financial market providing price and liquidity information for almost 10,000 over-the-counter (OTC) securities. The group has its headquarters in New York City. OTC-traded securities are organized into three markets to inform investors of opportunities and risks: OTCQX, OTCQB and Pink. The company was first established in 1913 as the National Quotation Bureau (NQB). For decades, the NQB reported quotations for both stocks and bonds, publishing the quotations in the paper-based Pink Sheets and Yellow Sheets respectively. The publications were named for the color of paper on which they were printed. In September 1999, the NQB introduced the real-time Electronic Quotation Service. The National Quotation Bureau changed its name to Pink Sheets LLC in 2000 and subsequently to Pink OTC Markets in 2008. The company eventually changed to its current name, OTC Markets Group, in 2010. Today, a network of over 100 broker-dealers price and trade a wide spectrum of securities on the OTC Markets platform. To be quoted on the platform, companies are not required to file with the SEC, although many choose to do so. A wide range of companies are quoted on OTC Markets, including firmly established foreign firms, mostly through American depositary receipts (ADRs). In addition, many closely held, extremely small and thinly traded U.S. companies have their primary trading on the OTC Markets platform.