Shares of SmileDirectClub (NASDAQ: SDC) rallied today, up a whopping 24.6% as of the end of trading. 

This was an odd rally, given that there was no news I could find that would justify such a massive move in the stock.

In that light, it appears today was a large short squeeze brought about by investors who were shorting the stock prior to earnings covering their bet. Yesterday, SmileDirectClub's stock plunged following its second-quarter earnings report.

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Source Fool.com