Live feed16:59:53·1182dINSIDERFilingvia QuantisnowSEC Form 4: Calderon Nancy E. bought $6,459 worth of shares (500 units at $12.92), increasing direct ownership by 24% to 2,562 unitsByQuantisnow·Wall Street's wire, on your screen.NTIC· Northern Technologies International CorporationIndustrialsOriginal source