Market Roundup

Shares of AutoNation Inc

rose about 0.7% after the company reported a 15% surge in its March new car sales. AutoNation's March new car sales climbed to 25,489 vehicles. For the first quarter, its new vehicle sales jumped 13%. Shares of Crown Castle International Corp

CCI

fell about 0.77% after the company announced that it is commencing a public offering of $1.0 billion of senior notes. Shares of W.W. Grainger Inc

GWW

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gained about 0.2% after the company announced its plans to acquire AnFreixo S.A., a unit of Votorantim Group for an undisclosed sum. The terms of the transaction were not disclosed. Shares of Marsh & McLennan Cos

MMC

fell about 1.1% after the company reported that it has bought Cosmos Services (America) Inc, the US insurance brokerage subsidiary of global trading firm ITOCHU Corporation

ITOCY

. However, the financial terms of the deal were not disclosed. Shares of CME Group Inc

CME

fell about 1.8% after the company reported a drop in its daily trading volume in March. CME Group's daily volume averaged 12.5 million contracts in March, a 13% decline versus March 2011 and 2% drop versus February. Its daily volume for interest-rate futures averaged 5.6 million contracts per day, a 15% decline versus a year-ago period and 5.8% versus February. For the first quarter, CME's trading volume averaged 12.3 million contracts per day, an 11% decline versus a year-ago period.