$AMC Entertainment(AMC)$What happenedStocks moved higher Tuesday as the broad S&P 500 index closed the session up by about 2.1%, but meme stocks GameStop (NYSE:GME), AMC Entertainment (NYSE:AMC), and Canadian cannabis company Sundial Growers (NASDAQ:SNDL) experienced more significant gains of 6.5%, 7.8%, and 4.1%, respectively.So whatThese three names are still targets of meme-stock-focused retail traders. Part of the reason for that is the continued high short interest in the stocks. As of Nov. 15, 28% of Sundial's share float was still sold short, while there was 10.8% short interest in GameStop and 17% short interest in AMC, according to data from MarketWatch. It's likely that large fractions of the shareholders in these companies are just wait