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The dominance of one stock exists in a couple of other sectors as well. For example the large energy sector ETFs are heaviest by far in
Exxon Mobil(XOM). The
iShares DJ US Energy Sector Index Fund(IYE) allocates 25% to XOM, the
Energy Select Sector SPDR(XLE) has 18% in XOM and the
Vanguard Energy ETF(VDE) has 23% in XOM. This also occurs with
Verizon(VZ) in telecom sector funds.
9 Stocks That Prove Dividends Make All the Difference
Clearly the tech sector ETFs have benefitted from the huge lift in Apple as that stock has become the largest company by market cap in the world by a wide margin. It should also be clear that a reversal of fortune for Apple will then become a drag on the performance of these funds. In the past, becoming the world's largest stock has not been a positive. It ended badly for
General Electric(GE) and
Petrochina(PTR) although it did not seem to signify any sort of top for Exxon Mobil.
If an investor would build a portfolio of individual stocks, they would do some form of research on each stock. The examples of Apple and Exxon Mobil means that there must also be some stock research even in an all-ETF portfolio.