California Code, Probate Code - PROB § 2455

(a) A trust company serving as guardian or conservator may deposit securities that constitute all or part of the estate in a securities depository as provided in Section 775 of the Financial Code.

(b) If the securities have been deposited with a trust company pursuant to Section 2328 or Section 2454, the trust company may deposit the securities in a securities depository as provided in Section 775 of the Financial Code.

(c) The securities depository may hold securities deposited with it in the manner authorized by Section 775 of the Financial Code.