Conventional Valley wisdom: The chaos in the public stock markets won't affect private companies, right? Wrong. In August, LinkedIn had set plans to let employees sell some of their shares to investors . Interest in the company had been keen, given its stated plans to wait to IPO rather than sell out. But the stock-sale plan was conditioned on the Nasdaq index staying above a certain level. It has since fallen through that floor, meaning employees will no longer be able to sell their shares. And we hear Bain Capital, a major LinkedIn investor who's backing the stock-sales plan, has the right to walk away if the Nasdaq doesn't recover by mid-October.