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Re:Yelp lays off 1000, furloughs 1100 by fnord77 on Thursday April 09, 2020 @11:03AM (#22823208)
a lot of good answers here but one's missing:

market effects of the underlying securities themselves. Supply and demand of actual stocks can affect price

The biggest one is a short squeeze

https://en.wikipedia.org/wiki/Short_squeeze

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