Maintenance: the presence of more than 2,000 companies in the public sector in Iran's economy / more than 90% of the petrochemical industry is in the hands of the public sector The head of the Majlis Research Center noted that 20 companies controlled by the government sector make up more than 60% of the market value of the Tehran Stock Exchange and said: more than 90% of the petrochemical industry is in the hands of the public sector.