Benzinga's M&A Chatter for Friday December 21, 2012

The following are the M&A deals, rumors and chatter circulating on Wall Street for Friday December 21, 2012: Carl Icahn Sells Greenbrier Shares after Company Rejects American Railcar $22/Share Bid The Rejection:Investor Carl Icahn sold most of his holdings in Greenbrier Companies (NYSE: GBX ) Friday, following the company's rejection