According to the Company's Act , a Company Secretary as defined in the company secretary Act, 1980 is appointed by a company to perform the functions of a company secretary under this act . A company secretary means an individual who is a member of the institute of companies secretaries of India and is appointed to perform the functions of a company secretary under the companies act . A company secretary is an important organ of a company who performs various ministerial and administrative duties . It is mandatory for every company having paid up capital of 5 crore or more to appoint a full tim company secretary .