The money manager had earlier said at the same event that Africa has an "incredible" investment potential and that he has stakes in Nigerian banks.
"These banks are doing very well and are much better regulated than they were in the past," Mobius said, without disclosing which lenders he holds.
Banks account for five of the eight stocks in the MSCI Nigeria Index. Guaranty Trust Bank Plc, the country's No. 2 lender by market value, surged 31 percent in the six months through May 27, according to data compiled by Bloomberg. Shares of Access Bank Nigeria Plc recorded the second-biggest decline on the gauge in the period, the data show.