Frontier Lithium (HLKMF: Pink Current) | Venue Change Fri, Nov 13, 2020 12:00 - Frontier Lithium ( HLKMF : OTC Link) - Venue Change - The symbol, HLKMF, no longer trades on Grey Market. As of Fri, Nov 13, 2020, HLKMF trades on OTC Link. You may find a complete list of venue changes at otcmarkets.com .