Pursuits

Biotech Stocks Are on the Brink of a Correction

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The bull run in biotechnology is having its worst month in more than a year.

Down in four of the last five days, companies tracked by the Nasdaq Biotechnology Index have fallen about 8 percent since July 20. They’re in danger of joining more than half the stocks in the Standard & Poor’s 500 Index nursing losses that meet the definition of a correction.