26 CFR § 1.1092(d)-2 - Personal property.
(a) Special rules for stock. Under section 1092(d)(3)(B), personal property includes any stock that is part of a straddle, at least one of the offsetting positions of which is a position with respect to substantially similar or related property (other than stock). For purposes of this rule, the term substantially similar or related property is defined in § 1.246-5 (other than § 1.246-5(b)(3)). The rule in § 1.246-5(c)(6) does not narrow the related party rule in section 1092(d)(4).
(b) Effective date -
(1) In general. This section applies to positions established on or after March 17, 1995.
(2) Special rule for certain straddles. This section applies to positions established after March 1, 1984, if the taxpayer substantially diminished its risk of loss by holding substantially similar or related property involving the following types of transactions -
(ii) Holding a short position in a stock index regulated futures contract (or alternatively an option on such a regulated futures contract or an option on the stock index) and stock in an investment company whose principal holdings mimic the performance of the stocks included in the stock index (or alternatively a portfolio of stocks whose performance mimics the performance of the stocks included in the stock index).