Jan 28 (Reuters) - Amateur stock traders made a concerted effort to buy shares of companies shunned by Wall Street, costing some fund investors billions and inflating stock valuations until several online trading platforms imposed trading restrictions on Thursday. Below are some fundamental indicators of some of the stocks that surged this week. Country Company Company %age change this week* Latest financial results 12-month forward P/E ratio No. of employees description U.S. GameStop Video game 441% $470.9 mln loss for year Not Available 14,000, as of Feb. retailer ended February 2020; $493 2020 mln negative cash flow U.S. American Airlines Airline operator 14.10% $1.7 billion in 2019 profit; -2.88 133,000, as of $453 mln in negative free Dec. 2019 cash flow Canadian BlackBerry Software services 56% $152 mln loss for year ended 163.19 3,647, as of Feb. provider February 2020 and $18 mln 2020 negative cash flow U.S. AMC Entertainment Movie theater 467% $150 mln loss for 2019 Not Available 3,952, as of Dec. operator 2019 Finland Nokia Telecoms equipment 22% Net income of 7 mln euros 25.96 98,322, as of Dec. maker for 2019; 300 mln euros of 2018 negative free cash flow U.S. Bed Bath & Beyond Home furnishing 75% Net loss of $614 mln in 47.8 55,000, as of Feb. retailer 2020; $318 mln free cash 2020 flow UK Pearson Publisher 14% 264 mln pounds in profit for 22.5 22,734, as of Dec. 2019; 176 mln pounds free 2019 cash flow UK Cineworld Group Ltd Theater Services 15% Net income of $180.3 mln -4.44 34,018, as of Dec. for year ended Dec. 2019 2019 Denmark Ambu Medical device 20% 241 mln krone ($39.21 mln) 174.74 4,200, as of Dec. maker for fiscal 2020; 135 mln 2020 krone in negative cash flow Austria Unibail-Rodamco Commercial 20% Net income of 1.71 mln euros 8.76 3,625, as of Dec. property firm in 2019; free cash flow 1.9 2019 mln euros Germany Evotec Drugmaker 18% 38.07 mln euros in 2019 129.34 3,444, as of Sept profit; free cash flow 10.3 2020 mln euros Australia Tassal Group Seafood supplier 4% A$69.1 mln profit for year 13.07 Over 1,200, as per ended June 2020; negative company website cash flow of A$88.86 mln Australia Inghams Group Ltd Poultry producer 4% A$40.1 mln profit for year 15.21 Not Available ended June 2020; A$257.8 mln free cash flow * - All percentage changes for U.S. companies are as of market close on Wednesday, and for UK and Australian companies are as of close on Thursday (1 krone = $0.16) Source: Company filings, Refinitiv data (Reporting by Medha Singh and Shashank Nayar in Bengaluru; Editing by Sriraj Kalluvila)