13-D, Form

Securities Law, abbreviation for SEC Form 13-D that must be filed with the United States Securities and Exchange Commission by any investor who acquires 5 percent or more of a U.S. traded public company. These filings can signal a takeover or change of ownership and for this reason, purchasers of blocks of shares in U.S. companies often limit their shareholdings to 4.9 percent to avoid giving up their identity.