Cal. Insurance Code § 1191.5

(a) Excess fund investments may be made by a domestic life insurer having admitted assets aggregating in value not less than one hundred million dollars ($100,000,000) in the purchase and sale of call options on interest-bearing obligations pursuant to subdivision (b) or (c). These investments may be made only in options on interest-bearing obligations issued by the United States of America, or any of its agencies or instrumentalities specified in Section 1180. (b) An insurer may purchase call options pursuant to this section for the sole purpose of executing a closing purchase transaction for the interest-bearing obligation subject to the option. An insurer shall not purchase any other options pursuant to this section. (c) An insurer may sell call options pursuant to this section only on interest-bearing obligations that it owns. An insurer shall not sell an interest-bearing obligation subject to an unexpired written call option sold by it except pursuant to a closing purchase transaction under the call option.