For more than 128 years, the iconic Dow Jones Industrial Average ( ^DJI 0.85%) has served as a barometer of Wall Street's health. Over that time, it's evolved from an index that contained a dozen (mostly) industrial stocks to one that now houses 30 diverse, multinational businesses.

U.S. stocks were lower after the close on Monday, as losses in the Utilities, Healthcare and Telecoms sectors led shares lower. At the close in NYSE, the Dow Jones Industrial Average lost 0.65%, while the S&P 500 index lost 0.

The swap reflects their reversal of fortunes within the tech industry and would have been unthinkable a few years ago.