System Group Co. (SG) (Persian: همكاران سيستم ‏‎‎) aka Hamkaran System, founded in 1987 by Mahmoud Nazzari, Shahriar Rahimi, and Homayoun Hariri, is Iran's largest private software development company. The company provides enterprise software solutions and support to businesses of all sizes located across the country. System Group is a conglomerate of 52 companies and has served over 35,000 clients.The company was listed as one of the top 500 companies in Iran. Hamkaran CVC, a newly founded company by Hamkaran System, is its Venture Capital.