Viridium Pac Group Ltd. (MRRBF: Grey Market) | Symbol Change Mon, Aug 20, 2018 12:00 - Viridium Pac Group Ltd. ( MRRBF : Grey Market) - Symbol Change - The symbol, MRRBF, is no longer a valid symbol for Viridium Pac Group Ltd.. As of Mon, Aug 20, 2018, the new trading symbol is VIRFF. You may find a complete list of symbol changes at otcmarkets.com .