Finally, AT&T was the last stock in the last decade to be removed from the Dow as it was ousted in 2015. It has underperformed badly since then with a share price down 12% as the telecom market has been sluggish and it's lost market share to T-Mobile.

On Friday, S&P Dow Jones Indices announced that AI chipmaker Nvidia will replace Intel in the Dow Jones Industrial Average, marking a seismic shift in the semiconductor industry and ending Intel's 25-year run on the prestigious stock market index. The change takes effect on November 8.

The ins and outs of membership in the 30-company group that represents success across industries and reflects stock market conditions.