Went public: May 24, 2006

The VoIP giant became a huge success in the early 2000s and looked to reign supreme by priming itself for an IPO in 2006. Vonage crushed all expectations at first, raising over $530 million and going public at $17 a share. Then a technical glitch occurred, which informed customers their stock purchases never went through, thus leading to a 30 percent share-price drop that first week. Those who brought shares were then told their transactions went through and still had to pay the original stock price per share. A class action suit followed, rewarding $800,000 in damages to angry buyers. Cue the Vonage commercial theme music.