The Best and Worst Investments of 2013

By Ben Steverman - 2013-12-06T18:41:13Z

Photograph by Thomas Barwick/Getty Images

Company Symbol % Change
18 of 22

Best U.S. Initial Public Offering

Aratana Therapeutics Inc.


Chief Executive Officer Steven St. Peter's goal for Aratana Therapeutics Inc. (PETX) is to be "the premier pet therapeutics company." Aratana, which went public June 26 and has no revenue yet, is developing several drugs for dogs and cats. In November, the company reported promising results for a drug that alleviates pain in dogs with osteoarthritis.

More than $77 billion in IPOs have been announced in 2013, including Twitter's Nov. 6 offering, making it the busiest year since at least 2010. 

Of 163 U.S. IPOs in 2013 with a market capitalization of at least $250 million, measured from opening price.