Car rental conglomerate Avis Budget has agreed to buy Zipcar for $500 million in cash ($12.25 per share), a 49 percent premium over the micro-term rental company’s December 31 share price of $8.24. The deal was predicted to close in Spring 2013, but is now being investigated by Zipcar shareholders and their respective legal counsel who are unhappy with the terms of the deal and are said to be considering a lawsuit. The company went public in April 2011, and quickly fell from its all time high of $27.96, with its current 52-week high being only $16.75. [Source: TechCrunch]