Change in promoters' shareholding: listed companies must file prescribed return reporting significant shareholding shifts within specified timeframe. Rule 13 required listed companies to file Form MGT.10 with the Registrar reporting increases or decreases of two percent or more in the shareholding of promoters and each of the top ten shareholders, to be filed within fifteen days of such change; subsequent notifications have omitted or substituted the explicit threshold and related sub clauses while preserving the threshold triggered filing mechanism and prescribed form.