Nazrul Islam Mazumder, chairman of Nassa Group, and three members of his family have been diagnosed positive with the novel coronavirus.
He is also the chairman of Exim Bank and Bangladesh Association of Banks (BAB).
Nazrul Islam and his wife Nasrin Islam are being treated at home after they were tested positive for the virus few days back, said a family source.
His son and daughter-in-law have been hospitalised as their condition was not improving, the source added.
The death toll from Covid-19 has risen to 650 in Bangladesh and the number of total cases stood at 47,153 as of Sunday.