 Radnor, Pennsylvania--Newsfile Corp. - June 5, 2021 - The law firm of Kessler Topaz Meltzer Check, LLP reminds investors that a securities fraud class action lawsuit has been filed against FibroGen, Inc. NASDAQ: FGEN FibroGen on behalf of those who purchased or acquired FibroGen securities andor sold put options from November 8, 2019 through April 6, 2021, inclusive the Class Period.Investor Deadline Reminder: Investors who purchased or acquired FibroGen securities during... 