RIO DE JANEIRO--Brazil's MMX Mineracao e Metalicos SA (MMXM3.BR) confirmed Thursday that controlling shareholder Eike Batista is in talks to reduce his stake in the company but said no deal has yet been signed, amid media reports this week that the negotiations are advancing.

"There are ongoing negotiations that are at a stage which confers no certainty as to their outcome," MMX Chief Executive Carlos Gonzalez said in a statement. "At this moment, there is no signed document."

A person familiar with the talks said this week that Mr. Batista is nearing a deal to sell a controlling stake in MMX. Two leading bidders have emerged: Swiss mining firm Glencore Xtrata PLC (GLNCY, GLEN.LN, 0805.HK) on the one hand, and a consortium of Abu Dhabi's Mubadala Development Company and Dutch trading house Trafigura Group on the other.

Mr. Batista, once Brazil's richest man, has been forced to sell off assets in recent months amid a severe crisis of confidence in his corporate empire.

MMX's most coveted asset is a major port near Rio de Janeiro that is expected to begin operating late this year and will have the capacity to ship up to 50 million metric tons of iron ore per year. The company's other main project, an expansion of the Serra Azul iron-ore mine, is on hold to preserve cash.

Write to Paul Kiernan at paul.kiernan@wsj.com

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