Thus, pursuant to paragraph (b)(1)(ii) of this section, A will be a member of a tiered structure unless under paragraph (c)(3) of this section, the S corporations, in the aggregate, own a de minimis portion of A. If the S corporations' ownership in A is not considered de minimis under paragraph (c)(3) of this section, A is a member of a tiered structure and will be allowed to make or continue a se