Companies have to file information about their auditors in Form NFRA-1

(a) companies whose securities are listed on any stock exchange in India or outside India;

(b) unlisted public companies having paid-up capital of not less than rupees five hundred crores or having annual turnover of not less than rupees one thousand crores or having, in aggregate, outstanding loans, debentures and deposits of not less than rupees five hundred crores as on the 31st March of immediately preceding financial year;

(c) insurance companies, banking companies, companies engaged in the generation or supply of electricity, companies governed by any special Act for the time being in force or bodies corporate incorporated by an Act in accordance with clauses (b), (c), (d), (e) and (f) of sub-section (4) of section 1 of the Act;

(d) any body corporate or company or person, or any class of bodies corporate or companies or persons, on a reference made to the Authority by the Central Government in public interest; and

(e) a body corporate incorporated or registered outside India, which is a subsidiary or associate company of any company or body corporate incorporated or registered in India as referred to in clauses (a) to (d), if the income or networth of such subsidiary or associate company exceeds twenty per cent. of the consolidated income or consolidated networth of such company or the body corporate, as the case may be, referred to in clauses (a) to (d). 

These companies have to inform National Financial Reporting Authority in Form NFRA-1 within 30 days of the commencement of these rules i.e. 13th November 2018, in Form NFRA-1, the particulars of the auditor as on the date of commencement of these rules. 

MCA has extended the time limit vide Circular No. 12/2018 dated 13-12-2018 and now time limit of 30 days have to be calculated from date of deployment of form on the website