ISP Holdings Limited, an investment holding company, engages in property and facility management, interiors and special projects, and ancillary businesses in the People's Republic of China. The company provides property and facility management services to government, corporate clients, public institutions, and private clients. It manages a portfolio of approximately 93,000 residential units of residential, commercial, and industrial facilities. The company also provides asset management services, such as feasibility study, due diligence, market positioning, design consultancy, marketing and promotion, financial analysis, leasing, tenancy management, and operation management services. In addition, it offers alteration and addition, fitting-out, conservation, renovation, demolition, and construction works; curtain walling, cladding, and related products; and security guarding, and security systems, as well as technical support services. Further, the provides project management; laundry and cleaning; procurement, supply chain, and trading; repair and maintenance services for equipment; indoor cleaning services; and property agency services, as well as property management consultancy. The company was formerly known as Synergis Holdings Limited and changed its name to ISP Holdings Limited in January 2022. The company was founded in 1978 and is based in Kwun Tong, Hong Kong. ISP Holdings Limited is a subsidiary of Champ Key Holdings Limited.