Company CIN, sometimes referred to as Company CIN Number or Company CIN No. is a unique identification number assigned by Registrar of Companies (ROC) functioning in various states under Ministry of Corporate Affairs (MCA), Govt. of India. After formation of the company, concerned ROC issues a certificate containing its unique Corporate Identification Number (CIN No. or CIN) along with its approved name. Every company must quote this unique Company CIN number whenever a correspondence or data forms submitted to MCA, particularly in audits and reports.