Went public: February 2000

The online pet-supply retailer gained a ton of attention through clever marketing (a multimillion-dollar Super Bowl ad) and its sock puppet mascot. Those factors alone helped the company raise nearly $82 million for its IPO and mark individual shares at $14. However, terrible business practices such as undercharging shipping costs and selling products at one-third of the price forced Pets.com into the financial dog house, as stocks plummeted from $11 per share to 19 cents. 

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