The Dow Jones Industrial Average (DJI)  are set to take effect this morning. Apple’s  (NASDAQ:AAPL)  4-for-1 stock split set off a cascade of changes as it shrank the weighting of formerly the most important Dow member to 3% from around 12%, and the overall technology representation in the index to around 20% from 27%. The new addition of Salesforce  (NYSE:CRM)  to the Dow will bring the share of tech in the index to about 23%, and will also see Amgen  (NASDAQ:AMGN)  and Honeywell  (NYSE:HON)  replace iconic Exxon Mobil  (NYSE:XOM), Pfizer  (NYSE:PFE)  and Raytheon  (NYSE:RTX).

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Apple (NASDAQ:AAPL)  begins trading today (at $125/share) following a 4-for-1 split, while Tesla  (NASDAQ:TSLA) starts trading (at $443/share) on a 5-for-1 split-adjusted basis. While the market caps of the companies will remain the same, some are saying the moves will make shares   more accessible to a broader base of investors.