Calfrac Well Services is engaged in providing specialized oilfield services, including fracturing, coiled tubing, cementing and other well stimulation and completion services which are designed to increase the production of hydrocarbons from wells to the oil and natural gas industries. Co.'s operations are mainly in Canada, the United States, Russia, Mexico and Argentina.

Cathedral Energy Services Ltd. and its subsidiaries are engaged in the business of providing selected oilfield services to oil and natural gas companies in western Canada and selected oil and natural gas basins in the United States.

Computer Modelling Group is a computer software technology firm engaged in the development and licensing of reservoir simulation software. Co. sells reservoir simulation software licenses to oil and gas companies, consulting firms and research institutions. Co.'s suite of reservoir simulators facilitates the analysis of the various types of reservoirs encountered by oil and gas companies in different parts of the world. Co.'s principal products are STARS, GEM, IMEX, BUILDER, RESULTS, WINPROP, CMOST and iSegWell. Co. also provides services consisting of support, consulting, training, and contract research activities.

Enterprise Group is a construction services company operating in the energy, utility and transportation infrastructure industry. Co.'s focus is primarily underground construction and maintenance and specialty equipment rentals. Co. provides directional drilling and installation of underground power, telecommunications and natural gas lines to the utility infrastructure segment of the construction industry. Co.'s heavy equipment rentals division, E One Limited, provides equipment rentals for both the oilfield and civil construction sectors and project crews constructing pipelines and facilities.

Essential Energy Services Trust is an open-ended unincorporated investment trust. The Trust was established to invest in debt, equity and other securities of its operating entities; hold directly all types of, or acquire or invest in, securities of any other subsidiary of the Trust and in securities of any other entity; holding or acquiring royalty or other interests in various assets and businesses; dispose of any part of the monies, properties and assets of the Trust; temporarily hold cash and investments, making certain other permitted investments, paying amounts payable by the Trust, making distributions to Unitholders; and pay costs, fees and expenses.

High Arctic Energy Services is an oilfield services company providing specialized drilling and well completion services to the oil and gas industry in Canada and other countries. Co. has two operating divisions, the International Division and the Domestic Division offering contract drilling and Workover services, Snubbing services and the supply of Cryogenic Liquid Nitrogen Pumping Services.

Precision Drilling is engaged in the provision of contract drilling and completion and production services primarily to oil and natural gas exploration and production companies in Canada and the United States. Co. operates two segments: Contract Drilling Services and Completion and Production Services. The Contract Drilling Services segment includes drilling rigs, directional drilling, procurement and distribution of oilfield supplies, and manufacture, sale and repair of drilling equipment. The Completion and Production Services segment includes service rigs, snubbing units, oilfield equipment rental, camp and catering services, and wastewater treatment units.

Secure Energy Services is an energy services company that focuses on providing specialized services to oil and natural gas companies operating in the Western Canadian Sedimentary Basin. The services provided by Co. include clean oil terminalling, custom treating of crude oil, crude oil marketing, produced and waste water disposal, oilfield waste processing, landfill disposal and the purchase and resale of crude oil. Co. also provides a range of these services in each of its operating facilities throughout Alberta and British Columbia. Co. operates three types of facilities: full service terminals, stand alone water disposal facilities and class I and II landfills.

Matrrix Energy Technologies is engaged in the acquisition and supply of downhole drilling technologies and services for the oil and gas industry in North America.

Titanium Corporation is engaged in the business of researching and developing a separation process for the recovery of heavy minerals and bitumen from oil sands froth treatment tailings. Co. is in the development stage as it has yet to earn any revenues and is devoting substantially all of its efforts toward research and development of this process. The recoverability of amounts expended on research and development, is dependent on the ability of Co. to complete pre-commercialization activities, commercialization at oil sands sites, and achieve future profitable operations.

Trican Well Service is an oilfield services company. Co. is engaged in the provision of specialized products, equipment, services and technology for use in the drilling, completion, stimulation and reworking of oil and gas wells in western Canada, Russia, Kazakhstan, the United States, and Algeria.