"The Model S, which is planned to compete in the premium vehicle market, is intended to have a significantly broader customer base than the Tesla Roadster," the company said in its IPO filing, ahead of its planned $226 million offering. A bet on Tesla, which debuted on the Nasdaq on June 29, 2010, was a wager on CEO Elon Musk's ability to develop a roster of mass-market electric cars and scale an automaker far away from the Detroit auto hub, focusing instead on Silicon Valley, home to much of the world's top tech talent. Musk didn't start Tesla, but he invested early, served as chairman and took over as CEO in October 2008, after leading a board revolt against founding CEO and inventor Martin Eberhard early that year. An investor who put $10,000 into Tesla's stock at the time of the company's IPO and held onto all those shares would now own a stake worth close to $3 million. A similar investment at the time in the S&P 500 would have resulted in holdings worth about $57,000.