"The court usually appoints the class member with the largest financial interest in the recovery sought by the Class to serve as the Lead Plaintiff" http://sec.gov/Archives/edgar/data/1201251/000101359409001619/xslF345X02/spongetechfm3-102909_ex.xml ......all purchasers of SpongeTech stock during the period from April 15, 2008 through October 5, 2009.