mbp 1

1.Applicable to Public & Private Limited Companies.
2.To disclose interest of directors for the FY .
3.Within 30 days of passing resolution in Board meeting .

It's disclosures of interest by director in any company/body corporate/firm/association of individuals, including details of the shareholding in Form MBP 1 at time of appointment or in first board meeting of Financial year.
Form MBP 1 is applicable for both private as well as public company
It's not required to be filed with ROC, it's only for record purpose, to be kept as registered office of the company.