Company return for declaration under section 89 requires particulars of registered and beneficial owners and supporting declarations. Form MGT-6 is the statutory return for a declaration under section 89 requiring particulars of shares where the registered holder is not the beneficial owner, including share details and separate full particulars for the registered owner and the beneficial owner. Mandatory attachments are the prescribed declarations, the form must be digitally signed by an authorised signatory, filed electronically to generate an SRN, and includes a caution about penalties for false statements and false evidence.