Putting the ‘January effect’ in context for investors.

BY PHIL ROSEN, CO-FOUNDER AND EDITOR, OPENING BELL DAILY @PHILROSENN

A trader works on the floor of the New York Stock Exchange on January 5, 2026. Photo: Getty Images

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Wall Street has long embraced the idea that January sets the tone for the year.

According to market lore, the first five trading days can predict whether stocks rise or fall over the next 12 months. The simplicity of the so-called January........

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