Why Marijuana Stocks Dropped Today

Canadian marijuana stock Aurora Cannabis (NYSE: ACB) won an upgrade from investment banker Jefferies Group this morning -- and the stock promptly tanked, falling 2.9% through 1:30 p.m. EDT. Larger marijuana producing rivals Canopy Growth (NYSE: CGC) and Aphria (NASDAQ: APHA) are down as well, 3.9% and 5.2%, respectively.

Suffice it to say, this is not how upgrades usually work.  

Image source: Getty Images.

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Source Fool.com