BlackRock Will Join The S&P 500 index, And Replace Genzyme Tonight

After the close of trading on Friday BlackRock Inc (NYSE:BLK). will replace Genzyme Corp (NASDAQ:GENZ). in the S&P 500 index (SNP:^GSPC). S&P is making the change because biotech company Genzyme announced last month that it would be taken private for $20.1 billion by