OSB Group Plc, through its subsidiaries, operates as a specialist 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, bespoke and specialist residential lending, secured funding, and asset finance services. The company also provides buy-to-let and specialist residential mortgages, mortgage servicing, administration, and retail savings products; and back office processing services. The company was founded in 1847 and is headquartered in Chatham, the United Kingdom.