STM Group Plc, together with its subsidiaries, provides various financial services in Gibraltar, Malta, Jersey, Spain, the United Kingdom, and internationally. It operates in four segments: Corporate Trustee Services, Pensions, Life Assurance, and Other Services. The company offers retirement, estate and succession planning, and wealth structuring services. It also provides life assurance solutions, trust and trustee, company management, international tax, and residency and citizenship services. STM Group PLC was founded in 1989 and is headquartered in London, the United Kingdom.