Live feed16:20:38·304dINSIDERFilingvia QuantisnowLarge owner O'Shaughnessy Laura exercised 7,580 units of Class B Common Stock at a strike of $872.01 and covered exercise/tax liability with 6,878 units of Class B Common Stock (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.GHC· Graham Holdings CompanyReal EstateOriginal source