Investing in private companies is notoriously risky. Most start-ups fail, and those that succeed can take a decade or longer to provide returns to shareholders. During a stock market rout, like the one experienced over the past two weeks, that risk is felt more acutely as investors aim to make sure they have ready access to cash. Starting Thursday, investors in companies like Greensbury Market, an organic food market in New York, Flipdaddy's, a burger and beer joint in Kentucky, and Le Grand Courtage, a sparkling wine maker, will have a new way to get liquidity. Read MoreYou can't chase returns like this in the stock market

http://www.cnbc.com/2015/09/02/circleup-launches-secondary-market.html