Change will take time , but is necessary for the nation 's largest home improvement store chain if it is to grow amid increasing competition , chief executive Bob Nardelli said .
The change will take time , but Nardelli said it is necessary for the nation 's largest home improvement store chain if it is to grow amid increasing competition .
The Dow Jones Industrial Average held on to small gains , up 19.96 to 9,092.91 , while the S & P 500 index shed 0.39 to 981.25 .