Live feed17:33:33·368dINSIDERFilingvia QuantisnowDirector Calderon Nancy E. bought $7,452 worth of shares (1,000 units at $7.45), increasing direct ownership by 14% to 7,954 units (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.NTIC· Northern Technologies International CorporationIndustrialsOriginal source