Ajavon is the founder of Cajaf-Comon, Benin's largest supplier of frozen chicken.
Bonkoungou acquired IB Bank in Togo last December.
The $100-million increase in his net worth in June follows a $300-million decline in May.
McKorley is a well-known businessman and the founder and CEO of the McDan Group.
Foyou's Brasaf will officially launch its first beer containing 75 percent malt and 25 percent corn on June 30.
Rabiu derives most of his fortune from his 98-percent stake in BUA Foods and 92-percent stake in BUA Cement.
The slump in his net worth can be attributed to a plunge in the shares of his publicly traded companies.
Prosus N.V. has grown into a leading global consumer Internet group.
Tinubu stated that 2020 was one of the most challenging years in the firm's history.
The refinery's pipeline infrastructure will process 540,000 barrels of Nigerian crude per day in the first phase of operation.