Tesla Inc (NASDAQ: TSLA) was by far the worst short in the market in 2020. Tesla short sellers lost more than $40.1 billion 2020, nearly six times the losses they endured betting against any other stock in the market. Apple Inc (NASDAQ: AAPL) was a distant second, with short sellers taking just a $6.7-billion mark-to-market loss on the year. Dusaniwsky said Tesla averaged about $17.8 billion in total short interest in 2020. Not only was Tesla a bad stock to bet against in 2020, it was the single best-performing S&P 500 stock of the year, gaining roughly 700%. Worst Shorts Of 2020 Here’s a look at the 10 worst stocks to short in the market in 2020, sorted by net mark-to-market losses: