Basic Uniform Commercial Code
Investment Property
Investment property is, like, stocks and commodities stuff.
Investment property can be certificated or uncertificated, depending on whether or not they issued a certificate.
A security interest in investment property can be perfected by filing.
A security interest in certificated investment property can be perfected by taking delivery of the stock. UCC § 9-313(a).
A security interest in investment property can be perfected by taking control of the stock. UCC § 9-314(a).
Certificated securities can be controlled by delivery or by indorsement to the creditor or being registered in the name of the creditor. UCC § 8-106(a)–(b).
Uncertificated securities can be controlled by delivery or by having the issuer agree to comply with the creditor's instructions without the registered owner's further consent. UCC § 8-106(c).
The strength of methods of perfection of investment property goes: control, then delivery, then filing. UCC § 9-328.