[["Norfolk Southern Corp.",2],["Old Republic Insurance Co.",2],["Safeco Insurance Co.",2],["Biogen Inc.",1],["CSX Corp.",1],["Children's Hospital Colorado",1],["Genentech Inc.",1],["Hilton Worldwide Holdings Inc.",1],["Interim HealthCare Inc.",1],["Med-Trans Corp.",1],["Mutual of Omaha Insurance",1],["Old Republic International Corp.",1],["Seaboard Corp.",1],["SpartanNash Co.",1],["The Home Depot Inc.",1],["Toyota Motor Corp.",1],["University of Nebraska Medical Center",1],["Wal-Mart Stores Inc.",1]]