Bahrain-based investment firm, Esterad Investment Co. (Esterad) has announced the opening of subscription to its public offering of convertible bonds on the Bahrain Stock Exchange. The offer includes BD7m worth of convertible bonds paying a 4.5% coupon publicly marketed to all investors across the region. The subscription period for the bond offer commences on January 10, 2010, and will close on January 24, 2010.