Charisma Energy Services Limited, formerly YHM Group Limited, is a Singapore-based investment holding company. The Company is engaged in the provision of management services to its subsidiaries. The Company operates through power and energy services segment, which is engaged in the owning, chartering and management of power generation equipment and in the owning, chartering and management of oil and gas related vessels and equipment. The Company, through its subsidiaries, is engaged in activities, including ship owning and provision of ship chartering services, and owning and leasing of accommodation module. The Company's subsidiaries include Anchor Marine 2 Inc., Anchor Marine 3 Inc., Anchor Offshore Services Inc. and Aus Am Pte. Ltd.