Significant beneficial ownership: notice requires targeted persons to provide specified ownership details within thirty days or face action. Notice requiring disclosure from persons the company reasonably believes to be significant beneficial owners or who possess knowledge of such owners, listing required particulars - name and address of beneficial owner, PAN, name in which shares are registered, date of acquisition, supporting documents and reason for non filing of the prescribed declaration - and directing submission in writing to the company's registered address within thirty days, with a warning that non compliance permits the company to proceed without further notice.