Nvidia and Sherwin-Williams will join the replacing Intel and Dow Inc. prior to the opening of trading on Nov. 8, according to S&P Dow Jones Indices, which oversees the venerable 30-stock index. S&P Dow Jones Indices said the “changes were initiated to ensure a more representative exposure to the semiconductors industry and the materials sector respectively.” Nvidia now is a far more important company than Intel, which once was the leading chip maker in the world.