Prokhorov's first major financial success came at MFK, which became a depository institution for the government. The bank acquired Soviet assets in the amount of US$300 to US$400 million. Prokhorov held the post of Chairman of the Board from 1992 until 1993. In 1993, Prokhorov became the Chairman of the Board for Potanin's Onexim Bank, which, in 1993, became the paying agent for Finance Ministry bonds and a servicing bank for the City of Moscow's external economic activities. In 1994, Onexim became the depository and paying agent for Russian Treasury obligations, and in 1995, it became the authorized bank for the federal agency dealing with bankrupt enterprises.