Zurich-Orbital Gemeinschaftsbank (Gemeinschaftsbank is German for "community bank") or short Z-OG is the world's prime financial institution.
Originally a Swiss corp called Global Financial Services it was taken over by the AAA megacorps (who each had huge debts with GFS) in 2032 and handed over to the Corporate Court in 2033.
Z-OG controls the Nuyen.
Both "Gemeinschaft Bank" and "Gemeinshaft Bank", even though found in official Shadowrun material, are incorrect spellings that make no sense in German. Gemeinschaftsbank is the correct spelling.