Okla. Stat. tit. 12A, § 12A-1-9-314: Perfection by control

PERFECTION BY CONTROL

(a) A security interest in controllable accounts, controllable

electronic records, controllable payment intangibles, deposit

accounts, electronic documents, investment property, or letter-of-

credit rights may be perfected by control of the collateral under

Section 7-106, 1-9-104, 1-9-106, 1-9-107, or 1-9-107A of this title.

(b) A security interest in controllable accounts, controllable

electronic records, controllable payment intangibles, deposit

accounts, electronic documents, or letter-of-credit rights is

perfected by control under Section 1-9-104, 1-9-107, or 1-9-107A of

this title not earlier than the time the secured party obtains

control and remains perfected by control only while the secured

party retains control.

(c) A security interest in investment property is perfected by

control under Section 1-9-106 of this title not earlier than the

time the secured party obtains control and remains perfected by

control until:

(1) the secured party does not have control; and

(2) one of the following occurs:

(A) if the collateral is a certificated security, the

debtor has or acquires possession of the security

certificate;

(B) if the collateral is an uncertificated security, the

issuer has registered or registers the debtor as the

registered owner; or

(C) if the collateral is a security entitlement, the

debtor is or becomes the entitlement holder.