 RADNOR, Pa., April 30, 2021 PRNewswire -- The law firm of Kessler Topaz Meltzer Check, LLP reminds Leidos Holdings, Inc. NYSE: LDOS Leidos investors of lead plaintiff deadline in securities fraud class action lawsuit has been filed against on behalf of those who purchased or acquired Leidos securities between May 4, 2020 and February 23, 2021 , inclusive the Class Period. 