Cal. Civ. Code § 1799.103
No consumer credit contract or guarantee of a consumer credit contract shall provide for a security interest in any investment property, as defined in paragraph (49) of subdivision (a) of Section 9102 of the Commercial Code, that is pledged as collateral, unless (a) the contract either specifically identifies the investment property as collateral or (b) the secured party is a securities intermediary, as defined in paragraph (14) of subdivision (a) of Section 8102 of the Commercial Code, or commodity intermediary, as defined in paragraph (17) of subdivision (a) of Section 9102 of the Commercial Code, with respect to the investment property. The identification of an account shall include the name of the holder, account number, and name of the institute holding the investment property. In the event that a consumer credit contract or guarantee does not comply with this section, the security interest in the investment property is void.
Ca. Civ. Code § 1799.103