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Why are big companies like Apple or Google not included in the Dow Jones Industrial Average (DJIA) index?
Traditionally, the Dow Jones Industrial Average (DJIA) was only comprised of stocks that were traded on the New York Stock exchange.  Neither Apple (AAPL) nor Google (GOOG) are traded on the New York Stock Exchange but instead are traded on NASDAQ.  All NASDAQ tickers are four characters long and all NYSE tickers are only three or less characters long (e.g. IBM or T (AT&T)). However in 1999, MSFT became the first NASDAQ stock to be included in the DJIA.  Given that AAPL now has the largest market capitalization of any company in U.S. history, I think it is likely if they retain that position, that they would eventually be let into the DOW club too, perhaps, ironically, even supplanting Microsoft.