eBay bought a former employee's stock from him; it wasn't an investment. Craigslist later bought back the stock (https://web.archive.org/web/20040813165340/http://www.cnewma...).

They owned at least 25% of the company at one point, but it was well after it started and gained critical mass, or liquidity in this case. My filter for this piece allowed for companies that raised money, but only if they managed to run independently, for a few years at least.