BLUEONE CARD INC. (MNKG: Pink No Information) | Symbol Change Fri, Jul 24, 2020 12:00 - BLUEONE CARD INC. ( MNKG : Pink No Information) - Symbol Change - The symbol, MNKG, is no longer a valid symbol for BLUEONE CARD INC.. As of Fri, Jul 24, 2020, the new trading symbol is MNKGD. You may find a complete list of symbol changes at otcmarkets.com .