A worrying sell signal just flashed for the stock market in August, says one of Wall Street’s most reliable bulls

• Investors should “be wary” of a potential stock market sell-off, according to Fundstrat’s Tom Lee.
• He highlighted in a Wednesday note why stocks could sell off in the coming weeks.
• “We believe investors just simply need to be vigilant,” Lee said.

A potential stock market sell-off is imminent, according to one of Wall Street’s most reliable bulls.

Fundstrat’s Tom Lee has been one of the most bullish strategists on Wall Street when nobody else was, and his forecasts have made investors who followed him a lot of money. That’s why Lee’s warning in a Wednesday note stands out.