The 13F regulatory filings from some of Wall Street's major players were released on Thursday and traders are taking notice. Warren Buffett bought an 11 million-share stake in Verizon Wireless valued at $524 million -- joined by Third Point Capital's Dan Loeb, who also disclosed he owned 3.5 million shares worth about $166 million at the end of the first quarter. Big managers cut their stakes in General Motors, however, as the automaker recalled a record number of vehicles. The Oracle of Omaha reduced his position in GM by ten million shares, while David Einhorn's Greenlight Capital unloaded all of its 17 million shares in the automaker.

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