13d filing definition
From Wikipedia, the free encyclopedia. Schedule 13D is an SEC filing that must be submitted to the US Securities and Exchange Commission within 10 days, by anyone who acquires beneficial ownership of more than 5% of any class of publicly traded securities in a public company.orm Uses [edit]. 13D filings allow the investing public to see who a public company's large shareholders are and, perhaps more importantly, why they have an interest in the company.