X0306 4 2020-05-26 0001303942 BankFinancial CORP BFIN 0001251848 ONEILL THOMAS F 60 NORTH FRONTAGE ROAD BURR RIDGE IL 60527 1 Common Stock 2020-05-26 4 P 0 900 8.6030 A 5060 D /s/ F. Morgan Gasior, pursuant to power of attorney 2020-05-28