S&P; to Add QLogic to Its 500 Index

Standard & Poor’s said Tuesday that it will add QLogic Corp., an Aliso Viejo designer of chips and circuit boards that link computers and data-storage systems, to its S&P; 500 Index.

S&P; said in a press release that QLogic, already an S&P; MidCap 400 component, will join two other newcomers, Vitesse Semiconductor Corp. and Stryker Corp., effective Monday.

The companies will replace Polaroid Corp., Springs Industries Inc. and Russell Corp., all of which will move to the SmallCap 600 index. In addition, Gillette Co. will replace Polaroid in the S&P; 100 Index, the New York rating company said.