Shareholding disclosure: persons with significant holdings must file annual and dividend-period disclosures; listed companies must report and maintain registers. Persons holding more than fifteen per cent of shares or voting rights must annually disclose holdings as on March 31 to the company within twenty-one days; promoters and persons with control must disclose their and persons acting in concert's holdings within the same period and on the dividend record date. Listed companies must, within thirty days from March 31 and on the dividend record date, report to all stock exchanges changes in such holdings and maintain a specified-format register recording received disclosure information.