Tamraz's first notable business enterprise was in 1967, when as an executive of the Wall Street investment bank Kidder, Peabody & Co., he successfully refloated a large Lebanese bank called Intra Bank, which had become insolvent in 1966. The bank had been founded in Beirut in 1951 by Yousef Beidas and three partners as a currency trading house named International Traders. The bank stopped payments on October 14, 1966.