STM Group Plc, together with its subsidiaries, provides various financial services in the United Kingdom, Gibraltar, Malta, and internationally. It operates through three segments: Pensions, Life Assurance, and Other Services. The company offers retirement, estate and succession planning, and wealth structuring services. It also provides pension solutions, life assurance solutions, annuities, and workplace pension solutions. STM Group Plc was founded in 1989 and is headquartered in London, the United Kingdom.