United States shareholder
For purposes of this title, the term “United States shareholder” means, with respect to any foreign corporation, a United States person (as defined in section 957(c)) who owns (within the meaning of section 958(a)), or is considered as owning by applying the rules of ownership of section 958(b), 10 percent or more of the total combined voting power of all classes of stock entitled to vote of such foreign corporation, or 10 percent or more of the total value of shares of all classes of stock of such foreign corporation.
Source
26 USC § 951(b)
Scoping language
None identified, default scope is assumed to be the parent (subpart F) of this section.