 NEW YORK, March 19, 2021 PRNewswire -- OTC Markets Group Inc. OTCQX: OTCM, operator of financial markets for 11,000 U.S. and global securities, today announced Frontier Lithium TSX-V: FL; OTCQX: LITOF, an emerging lithium mineral and chemicals company, has qualified to trade on the OTCQX Best Market. Frontier Lithium upgraded to OTCQX from the OTCQB Venture Market. 