June 3 (Reuters) - Renewed buzz on social media has seen amateur retail investors again pile into favorites such as cinema operator AMC Entertainment and BlackBerry Ltd, inflating their valuations and costing short sellers billions of dollars. With a number of Wall Street analysts saying AMC is already heavily overvalued and many institutional traders steering clear of the stock, here"s a look at some fundamental indicators of the stocks that have surged this week. Country Company Company Description %age change Latest financial results 12-month forward No. Of employees this week* P/E ratio U.S. AMC Entertainment Theater chain 139.5% $567 mln net loss for qtr -14.17 25,019, as of Dec. 2020 ended March 31; $324.8 mln negative free cash flow Canada BlackBerry Software developer 51.4% $315 mln net loss for qtr 766.44 3,497 as of Feb 2021 ended Feb. 28; $38 mln positive free cash flow U.S. Bed Bath & Beyond Home products seller 57.9% $47.10 net income for qtr 16.32 55,000, as of Feb. 2020 ended Fed. 28;$89.8 mln positive free cash flow U.S. GameStop Videogame retailer 27.1% $90.70 mln net income for -494.90 14,000, as of Feb. 2020 qtr ended Jan. 31; $63.7 mln positive free cash flow U.S. Koss Corp Headphones retailer 76.5% $474,168 net loss for qtr Not available Not available ended March 31;$1.38 mln positive free cash flow as of end-2020 U.S. Sundial Growers Cannabis grower 16.5% $136.6 mln net loss for qtr -23.77 394 as of Dec. 2020 ended March 31;$60.7 mln negative free cash flow U.S. Microvision Electronic equipment 22.1% $6.2 mln net loss for qtr -105.63 52 as of March 2021 maker ended March 31;$16.5 mln negative free cash flow as of end-2020 * - All percentage changes for U.S. companies are as of market close on Wednesday Source: Company filings, Refinitiv data (Reporting by Ambar Warrick in Bengaluru; Editing by Saumyadeb Chakrabarty) Our Standards: The Thomson Reuters Trust Principles.