Sec. 177 of the companies act, 2013

sec 177 relating to audit committee is not applicable to private companies......sec 177(9) relating to establishment of vigil mechanism is applicable to the following companies: (a) the Companies which accept deposits from the public; (b) the Companies which have borrowed money from banks and public financial institutions in excess of fifty crore rupees..... So any company falling in above criteria have to establish a vigil mechanism......