Stock pickers, who for so long decried the rise of passive investing, are now trying to profit from it.
In what's emerging as a nascent line of market research across Wall Street, investors are attempting to puzzle out how passive investing creates opportunities—or pitfalls—for individual stock trading. They are looking at factors such as the percentage of a stock owned by index funds and money flows into and out of such funds as they size up whether to buy or sell shares of a company.
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