An OPC is required to inform the Registrar of Companies (ROC) about the breach of the threshold limit through filing a Form INC-22A, also known as "Active Company Tagging Identities and Verification" within a period of 30 days from the date of such breach. This form must be filed along with the financial statements and a resolution passed by the Board of Directors of the OPC approving the conversion into a private limited company.
Additionally, the OPC must also hold a general meeting of its members and pass a special resolution for the conversion into a private limited company and file the necessary forms and documents with the ROC