Mayr-Melnhof Karton AG (MNHFF: Pink Current) | Venue Change Thu, Jul 23, 2020 12:00 - Mayr-Melnhof Karton AG ( MNHFF : OTC Link) - Venue Change - The symbol, MNHFF, no longer trades on Grey Market. As of Thu, Jul 23, 2020, MNHFF trades on OTC Link. You may find a complete list of venue changes at otcmarkets.com .