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Re:Tesla’s Engineering Chief Takes Leave of Absence at Pivot... by et2o on Friday May 11, 2018 @10:34PM (#17052191)
25% of all Tesla stock is out on loan according to the first Google result for "Tesla short" [1] Assuming most stocks on loan are due to shorting, 0.25*50 Billion (Tesla Market Cap)= approximately 10 Billion being shorted.

1. https://www.cnbc.com/2016/04/01/tesla-short-interest-hits-re...

Re:Tesla’s Engineering Chief Takes Leave of Absence at Pivot... by shanghaiaway on Saturday May 12, 2018 @08:28PM (#17056774)
12.5B
Re:Tesla’s Engineering Chief Takes Leave of Absence at Pivot... by et2o on Sunday May 13, 2018 @11:29PM (#17062466)
I left some out out in my estimate in case stocks are loaned for another reason I'm not aware of.