An SEC (www.practicallaw.com/9-382-3806) rule that provides that when an issuer, or person acting on its behalf, discloses material, non-public information to certain persons (such as research analysts, investment bankers, securities market professionals and holders of the issuer's securities), it must make public disclosure of that information. For more information, see Practice Note, Complying with Regulation FD (Fair Disclosure) (www.practicallaw.com/1-383-2635).