Market Turns Upside-Down as Go-Go Tech Stocks Join Slow-Mo Funds – Wall Street Journal (subscription)

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This month’s brief technology-stock rout reveals an underside for investors of a steady 2017 rally: Shares of giant tech firms are cropping up everywhere, complicating efforts to diversify portfolios.

Alphabet Inc., Apple Inc., Microsoft Corp. and other tech giants are more heavily represented than they were just a year ago in many so-called factor-based investing strategies. Many of these follow indexes that aim to beat or tamp…