https://www.reuters.com/article/us-usa-stocks-shorts-gamestop/gamestop-amc-short-sellers-sit-on-nearly-1-billion-loss-ortex-idUSKCN2CZ15K >Investors are estimated to have lost $930 million on their short positions in meme stocks GameStop and AMC Entertainment over the last five trading days, data from financial analytics firm Ortex showed on Tuesday.