(a) Shareholding test.--A foreign domiciliary corporation shall cease to be such on the first day of the sixth month following the month in which the corporation first has knowledge that the test of section 4102(a) (relating to foreign domiciliary corporations) is no longer met.
(b) Foreign corporations with registered securities.--The exemption provided by section 4102(b)(1) shall take effect on the day following the day on which the corporation becomes a corporation described in that provision.
(c) Subsidiary corporations.--The exemption provided by section 4102(b)(2) shall take effect immediately upon the acquisition, directly or indirectly, of the last outstanding share of the corporation by one or more registered corporations or corporations described in section 4102(b)(1).