insurance company
comprise more than 50 percent of its total reserves (as defined in subsection (c)). For purposes of the preceding sentence, the term “insurance company” means any company more than half of the business of which during the taxable year is the issuing of insurance or annuity contracts or the reinsuring of risks underwritten by insurance companies.
Source
26 USC § 816(a)
Scoping language
None identified, default scope is assumed to be the parent (subpart E) of this section.