OSB Group Plc, through its subsidiaries, operates as a specialist mortgage lending and retail savings company in the United Kingdom and the Channel Islands. It provides private rented sector related buy-to-let, commercial and semi-commercial mortgages, residential development finance, secured funding, bridging, and asset finance services. The company also provides buy-to-let and specialist residential mortgages, mortgage servicing, administration and analytical, mortgage originator and servicer, and retail savings products; and back office processing services. OSB Group Plc was founded in 1847 and is based in Chatham, the United Kingdom.