is swapping with Intel, and Sherwin-Williams is replacing chemical giant Dow. Here's why the shakeups in the 128-year-old index reflect broader market leadership, and why the very definition of what it means to be a blue chip stock could need an update.

The Dow Jones Industrial Average's shift away from value and income could open the door for other mega-cap growth stocks.

UnitedHealth makes up 8.8% of the index compared to just 0.4% for Intel. Stock splits don't matter in the S&P 500 or Nasdaq Composite because a stock split doesn't affect a stock's market capitalization. A $1 trillion company is weighted the same ...