Keyne Ltd, an investment holding firm established in 2001, primarily... Keyne Ltd, an investment holding firm established in 2001, primarily specializes in real estate and hospitality development operations across Hong Kong and mainland China. Its business activities also include property leasing, the provision of district heating, and management services. The company, headquartered in Causeway Bay, Hong Kong, adopted its current name in March 2020, having previously operated as Nine Express Limited.