Stocks Turn Lower as High-Flying Tech Shares Fall – Wall Street Journal (subscription)

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Technology shares tumbled Friday, as investors pulled back on one of the most profitable trades of the year so far.

Large tech companies pushed major indexes higher in recent months, with stalwarts such as Facebook, Apple and Amazon.com leading the rise. Those companies’ outsized gains had prompted some jitters among investors in recent trading sessions, and a series of downbeat research notes about the group and climbing valuations…