31 CFR §802.218

1. (a)The term foreign entity means any branch, partnership, group or sub-group, association, estate, trust, corporation or division of a corporation, or organization organized under the laws of a foreign state if either its principal place of business is outside the United States or its equity securities are primarily traded on one or more foreign exchanges.
2. (b)Notwithstanding paragraph (a) of this section, any branch, partnership, group or sub-group, association, estate, trust, corporation or division of a corporation, or organization that can demonstrate that a majority of the equity interest in such entity is ultimately owned by U.S. nationals is not a foreign entity.