Zipcar falls to lowest price since its IPO

Scott Eells/Bloomberg News
Scott Griffith is the chief executive of Zipcar, which is based in Cambridge.

Is Zipcar Inc. shifting gears fast enough to please investors? The stock fell to the lowest price since the company went public in April 2011. Zipcar posted an 8 cent loss, better than the 11 cents analysts expected. But its guidance for the second quarter gave pause: It implies revenue growth decelerating to 15 to 20 percent, after growth of 20.4 percent in the first quarter, wrote an MKM Partners analyst, Christopher Agnew. And Zipcar, a so-called car-sharing company that rents cars by the hour as well as the day, is facing tough new rivals like Hertz Global Holdings. “Revenue growth should be accelerating, not decelerating,’’ said Agnew, who rates the stock a “sell.’’