Via Yahoo Finance:
LONDON (Reuters) – Wall Street investors are sitting on estimated year-to-date losses of $70.87 billion on their bets against U.S. companies following massive surges in some of the heavily shorted shares, data from analytics firm Ortex showed on Thursday.
Some shares such as in video game retailer GameStop have jumped more than 1,000% in the past week, driven primarily by retail investors trading on online apps and sharing tips on social media messaging boards
Such gains have forced short-sellers to buy back stock to cover potential losses in what is dubbed a short-squeeze. Moves were exacerbated by more retail investors piling into the stock.
Ortex data showed that as of Wednesday, there were loss-making short positions on more than 5,000 U.S. firms.