NEW YORK, Sept. 15, 2026 (GLOBE NEWSWIRE) -- OTC Markets Group Inc. (OTCQX: OTCM), operator of regulated markets for trading 12,000 U.S. and international securities, today announced Challenger Gold Limited (ASX: CEL; OTCQX: CLLEF), a gold and copper exploration company, has qualified to trade on the OTCQX® Best Market. Challenger Gold Limited upgraded to OTCQX from the OTCQB® Venture Market. Challenger Gold Limited begins trading today on OTCQX under the symbol “CLLEF.” U.S. investors can find current fina ...