 NEW YORK, March 26, 2021 PRNewswire -- OTC Markets Group Inc. OTCQX: OTCM, operator of financial markets for 11,000 U.S. and global securities, today announced Gratomic Inc. TSX-V: GRAT; OTCQX: CBULF, an advanced materials company, has qualified to trade on the OTCQX Best Market. Gratomic Inc. upgraded to OTCQX from the OTCQB Venture Market. 