Meat company Tyson Foods has confirmed that it is to be added to the S&P 500 upon completion of the Unocal acquisition by Chevron. 

"We are pleased to be added to the S&P 500," said chairman and CEO John Tyson. "Tyson has come a long way since it was first included in the S&P MidCap 400.  We've grown from being a leading chicken producer to the world's leading producer and marketer of chicken, beef and pork.  As such, we believe we are a strong representative for the protein industry in the Packaged Foods & Meats category."

The S&P 500 is an index of 500 stocks chosen by Standard & Poor's for their market size, liquidity and industry group representation.  It is considered a benchmark of performance of the overall market. Standard & Poor's selects the 500 stocks, which represent leading companies in leading industries.