Coinspeaker Tesla (TSLA) Becomes 16th Largest U.S. Stock as Investors Short Shares Worth $20 BillionTesla investors are beginning to short the company’s stock. As a result, the automaker is poised to hit the $20 billion short-interest threshold.Tesla (TSLA) Becomes 16th Largest U.S. Stock as Investors Short Shares Worth $20 Billion