Live feed17:52:55·88dINSIDERFilingvia QuantisnowChairman and CEO O'Grady Michael covered exercise/tax liability with 21,739 shares and exercised 34,489 shares at a strike of $58.25 (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.NTRS· Northern Trust CorporationFinanceOriginal source