The pink sheet market is a very risky market usually listing penny stocks or very unliquid stocks.  This use to be a very thinly traded market but over the last few years has become highly popular.

The pink sheet market is a fast way for many companies to go public and is also the resting grounds for large companies that have been delisted from larger exchanges.

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Pink Sheets LLC is the former name of Pink OTC Markets Inc, a privately owned company that operates the Pink Sheets.

The Pink Sheets is an electronic quotation system that displays quotes from broker-dealers for many over-the-counter (OTC-traded) securities. Market makers (and other brokers who buy and sell OTC securities) can use the Pink Sheets to publish their bid and ask quotation prices.

The name "Pink Sheets" comes from the color of paper the quotes were printed on prior to the electronic system, then published by the National Quotation Bureau.

Pink Sheets LLC is neither a NASD broker-dealer nor registered with the U.S. Securities and Exchange Commission; it is not a stock exchange. To be quoted in the Pink Sheets companies do not need to fulfill any requirements (e.g. filing financial statements with the SEC).

With the exception of a few foreign issuers (mostly represented by American Depositary Receipts, or ADRs), the companies quoted in the Pink Sheets tend to be closely held, extremely small, or thinly traded. Most do not meet the minimum U.S. listing requirements for trading on a stock exchange such as the New York Stock Exchange. Many of these companies do not file periodic reports or audited financial statements with the SEC, making it very difficult for investors to find reliable, unbiased information about those companies.