The story
The bank was established in 1981 by a group of Sudanese businessmen.
In July 2006, the Lebanon's Bank Audi acquired 75% of the value of the stock and signed an agreement between National Bank of Sudan and Lebanon's Bank Audi at the Friendship Hall to enter a partnership. In the partnership Bank Audi, a strategic partner of the National Bank rate 75% of the Bank shares, raised capital to the National Bank 72 million U.S. dollars.
From Wikipedia’s article on National Bank of Sudan, shared under CC BY-SA 4.0.4