Computer Modelling Group Ltd., abbreviated as CMG, is a software company that produces reservoir simulation software for the oil and gas industry. It is based in Calgary, Alberta, Canada with branch offices in Houston, Dubai, Bogota, Rio de Janeiro, London and Kuala Lumpur. The company is traded on the Toronto Stock Exchange under the symbol CMG. The company offers three reservoir simulation applications. IMEX, a conventional black oil simulator used for primary, secondary and enhanced or improved oil recovery processes; GEM, an advanced Equation-of-State compositional and unconventional simulator; and STARS a k-value thermal and advanced processes simulator. CMG also offers CMOST, a reservoir engineering tool that conducts automated history matching, sensitivity analysis and optimization of reservoir models. In addition, CMG has developed CoFlow, which is a unique production engineering software for wellbore and facility analysis and allows for smart coupling with reservoir models. Wikipedia