GM, which filed for bankruptcy protection today, and Citigroup, the recipient of $45 billion in taxpayer aid, became the first companies since American International Group Inc. in September to leave the 30-stock average. Their shares have lost more than 90 percent since the start of 2007.

By replacing GM with Cisco, Dow Jones & Co. has removed automakers from the best-known benchmark for U.S. stocks, saying in an e-mailed statement that computers are as central to the economy as cars were in the previous century. Citigroup, until last year the world’s biggest financial firm by assets, is being replaced by a company it jettisoned in 2002 and that was once run by its former chairman, Sanford "Sandy" Weill.

"This announcement brings front and center the challenges facing the U.S. economy as it strives to remain competitive," said Alan Gayle, director of asset allocation at Ridgeworth Investments, which manages $60 billion in Richmond, Virginia. "The Dow Jones Industrial Average is becoming less of an industrial average. It's trying to reflect the broader economy."