NEW YORK, June 22, 2011 /PRNewswire/ -- OTC Markets Group Inc. (OTCQX: OTCM), the financial information and technology services company that provides the world's largest electronic marketplace for broker-dealers to trade unlisted stocks, today announced that Macarthur Minerals Ltd. (TSX.V: MMS; OTCQX: MMSDF), a company focused on the exploration and development of an iron ore project in Western Australia, is now trading on the highest tier of the OTC market, OTCQX®.

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Macarthur Minerals began trading today on the OTC market's prestigious tier, OTCQX International.  Investors can find current financial disclosure and Real-Time Level 2 quotes for the Company on www.otcqx.com and www.otcmarkets.com.

"Companies use OTCQX to expand their access to investors, engage them with quality disclosure of their financials, and provide trading transparency to stimulate liquidity," said R. Cromwell Coulson, President and Chief Executive Officer of OTC Markets Group. "We are pleased to welcome Macarthur Minerals to OTCQX."

Stifel Nicolaus & Company, Inc. will serve as Macarthur Minerals' Principal American Liaison ("PAL") on OTCQX, responsible for providing guidance on OTCQX requirements.

About Macarthur Minerals Ltd.

Macarthur Minerals Ltd. (TSX.V: MMS; OTCQX: MMSDF) trades in the United States on OTCQX under the symbol "MMSDF". Macarthur Minerals Ltd is an Australian company currently focused on the exploration and development of its Lake Giles project located in Western Australia.

About OTC Markets Group Inc.

OTC Markets Group Inc. (OTCQX: OTCM) operates the world's largest electronic marketplace for broker-dealers to trade unlisted stocks.  Our OTC Link™ platform supports an open network of competing broker-dealers that provide investors with the best prices in over 10,000 OTC securities.  In 2010, securities on OTC Link traded over $144 billion in dollar volume, making it the third largest U.S. equity trading venue after NASDAQ and the New York Stock Exchange. We categorize the wide spectrum of OTC-traded companies into three tiers - OTCQX (the quality-controlled marketplace for investor friendly companies), OTCQB® (the U.S. reporting company marketplace for development stage companies), and OTC Pink™ (the speculative trading marketplace) - so investors can identify the level and quality of information companies provide.  To learn more about how OTC Markets Group makes the unlisted markets more transparent, informed, and efficient, visit www.otcmarkets.com.

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SOURCE OTC Markets Group Inc.

Copyright 2011 PR Newswire

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