Citron Research's Andrew Left tells CNBC's "Fast Money" he shorted Nvidia ahead of its earnings report tonight, adding "This stock has run way too far, too fast."
The short-seller added he also bought some call options for insurance in case he is incorrect on his bearish view.
Nvidia will report fiscal second-quarter results after the market close.
This wasn't the first time Left expressed a negative view on Nvidia shares. He predicted last December that the stock would decline to $90 and tweeted about the graphics chip maker in June.
Nvidia did not immediately respond to a request for comment.
The company is one of the best performing stocks in the market. Its shares are up more than 50 percent year to date versus the S&P 500's 9 percent return.