Shares of AMC Entertainment (NYSE: AMC) are tumbling 9.5% at 11:22 a.m. on Thursday after a couple of days running higher following a positive weekend box office report. 

Although there was no company-specific news to account for the movie theater operator's decline, CEO Adam Aron was on Twitter yesterday dashing the claims of some retail investors that there's a massive hidden pool of shares being shorted, which is holding back the stock.

"As I've said before," Aron's tweet read, "we've seen no reliable info on so-called synthetic or fake shares."

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Source Fool.com