Live feed19:14:05·613dINSIDERFilingvia QuantisnowLarge owner O'Shaughnessy Laura exercised 25,752 units of Class B Common Stock at a strike of $719.15 and covered exercise/tax liability with 24,126 units of Class B Common Stock (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.GHC· Graham Holdings CompanyReal EstateOriginal source