By Matthew Cowley and Rogerio Jelmayer 

SÃO PAULO--A minority shareholder in CorpBanca SA said Tuesday it has asked a New York court to halt a merger of the Chilean bank with Brazil's Itaú Unibanco Holding SA, alleging Chilean executives committed fraud to bail out a struggling conglomerate.

In January, Itaú agreed to combine its existing Chilean bank with CorpBanca and invest $650 million in the business. If the deal goes through, Itaú would own about 33.58% of the new bank and largely control the operation, while Alvaro Saieh, CorpBanca's controlling shareholder, would own 32.92%. The new bank would become the fourth-largest in Chile by assets, with some $45 billion in assets, according to Itaú.

Cartica Management LLC, which has been criticizing the merger plan, in a statement Tuesday claimed that Mr. Saieh and other executives secured a "financial bailout" for his holding company, CorpGroup SA, in exchange for handing control of CorpBanca to Itaú.

"Mr. Saieh used fraud to extract a control share premium for his majority stake in CorpBanca as well as numerous other short- and long-term benefits," Cartica said.

CorpGroup owns SMU SA, a troubled supermarket chain that has weighed on the broader conglomerate, which also includes media firm Copesa SA. CorpBanca's funding costs jumped after SMU's troubles deepened last year. SMU has launched an aggressive turnaround strategy.

Cartica said its funds own about 3.2% of CorpBanca's shares.

Cartica, a Washington, D.C., asset manager, said it has filed the complaint in the United States District Court of the Southern District of New York against CorpBanca, Mr. Saieh, CorpBanca's directors, and its chief executive and chief financial officers, among others.

A spokesman for CorpGroup and Mr. Saieh wasn't immediately available to comment Tuesday. CorpGroup previously has rejected Cartica's complaints and said the deal provides equal treatment to all shareholders. It has said the deal meets all Chilean laws and that when two companies merge, there is no need for a public tender offer for shares outstanding.

Itaú didn't immediately respond to a request for comment.

Write to Matthew Cowley at matthew.cowley@wsj.com and Rogerio Jelmayer at rogerio.jelmayer@wsj.com

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