Admission to Prime Standard requires the fulfillment of the following transparency criteria: quarterly reports; international accounting standards (IAS or US-GAAP); company calendar; at least one analyst conference per year; ad-hoc messages in English. Companies aiming to be listed in this segment have to apply for admission. Being listed in Prime Standard is a prerequisite for an equity to be included in the selection indices of FWB Frankfurter Wertpapierbörse (the Frankfurt Stock Exchange).