Year-to-Date: Down 27 Percent
A trading glitch at Nasdaq on the day of Facebook's initial public offering provided an inauspicious start to one of the most-anticipated IPOs in recent years. Shares opened at $38, briefly spiked higher before trading down as low as $17 in the following months as questions about how the social media giant would generate revenues. Improved performance in the following months, a mobile advertising strategy and plans to monetize its Instagram acquisition lifted Facebook's stock price toward the end of the year.
(Watch: Time to 'Like' Facebook Again?)