3520 form is filed to report transactions with foreign trusts and receipt of certain foreign gifts
5471 form is filed to report interest in Certain Foreign Corporations.
5472 form is filed to report income for Foreign Shareholder Owning 25% or More in US Corporation.
926 form is filed to report income for transfer of property to a foreign entity.
8865 form is filed to report the return of U.S. Persons with respect to certain foreign partnerships