If you want trading data and (where available) financial data on unlisted stocks, a good resource is OTC Markets, the successor to the old Pink Sheets and a trading platform for 9, 973 issues.
Stocks in the Over-The-Counter market are quoted on systems like the OTC Bulletin Board, an electronic quotation system, and the Pink Sheets, which is not registered as a stock exchange and is named for the color of paper on which its listings of price quotes for companies have historically been printed.