Here's Why Merck Stock Vaulted Higher in October

Shares of the pharma giant Merck (NYSE: MRK) rose by 17.2% over the course of October, according to data from S&P Global Market Intelligence. The drugmaker's stock caught fire last month for two interrelated reasons.

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Since the start of November, Merck's shares have reversed course in a big way. Specifically, the drugmaker's stock is presently down by 7.3% during just the first week of trading this month.

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Source Fool.com