Cal. Rev. & Tax. Code § 24363

For purposes of Sections 24360 to 24363.5, inclusive, the term “bond” means any bond, debenture, note, or certificate or other evidence of indebtedness, but does not include any such obligation which constitutes stock in trade of the taxpayer or any such obligation of a kind which would properly be included in the inventory of the taxpayer if on hand at the close of the taxable year, or any such obligation held by the taxpayer primarily for sale to customers in the ordinary course of its trade or business.