The Office of the Special Prosecutor (OSP) has disclosed how its cooperation with United States authorities contributed to the conviction of Ghanaian-American businessman and former Goldman Sachs investment banker, Asante Kwaku Berko, in a $1 million bribery case.

A federal jury in Brooklyn, New York, convicted Berko on August 6, 2026, after finding him guilty of conspiring to pay and paying more than $1 million in bribes to multiple Ghanaian officials between 2014 and 2015.

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According to US court documents, the bribes were linked to the development and financing of a power plant in Ghana under a deal involving the Republic of Ghana, Turkish energy company Aksa Enerji Uretim A S, and Goldman Sachs, a former client of the Turkish company.

Berko, a dual citizen of Ghana and the United States, is also a former Managing Director of Tema Oil Refinery (TOR) and former Executive Director in the Investment Banking Division of Goldman Sachs.

According to the OSP, it provided investigative and evidentiary assistance to the Federal Bureau of Investigation (FBI) through Ghana’s mutual legal assistance framework.

“The Office of the Special Prosecutor (OSP) provided investigation and evidentiary assistance to the Federal Bureau of Investigation (FBI) of the United States through Ghana’s established mutual legal assistance framework.

“The involvement of the OSP has been acknowledged by the United States Department of Justice (DoJ) as providing “significant assistance to this prosecution”,” the OSP said in a public notice issued on August 10, 2026.

The OSP further disclosed that its collaboration with the FBI was largely carried out behind the scenes but played a role in the successful prosecution of Berko.

The anti-corruption agency said the case shows the importance of cooperation between law enforcement agencies across countries in dealing with corruption cases.

“The cooperation between the FBI and the OSP on this case occurred behind the scenes, and its public outcome of a successful prosecution is a testament to the importance of mutual legal assistance,” the OSP stated.

Meanwhile, following his conviction, Asante Berko faces a maximum sentence of 30 years in prison and is expected to be sentenced on November 10, 2026.

Read the OSP’s statement below:



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