Beneficial ownership register requirement mandates recording significant beneficial interests and specified owner particulars and filing dates. Form BEN-3 prescribes a Register of beneficial owners holding significant beneficial interest under section 90(2) and rule 5(1), listing for each beneficial owner: name, contact, date of birth/age, parent/spouse name, occupation, nationality, PAN/UIN, passport for foreign nationals, status, and dates for declaration, cessation, register entry, and BEN-2 filing, together with any other interests and member instructions.