(1) PERFECTION BY CONTROL. A security interest in investment property, deposit accounts, letter-of-credit rights, electronic chattel paper, or electronic documents may be perfected by control of the collateral under s. 407.106, 409.104, 409.105, 409.106, or 409.107.
(2) SPECIFIED COLLATERAL: TIME OF PERFECTION BY CONTROL; CONTINUATION OF PERFECTION. A security interest in deposit accounts, electronic chattel paper, letter-of-credit rights, or electronic documents is perfected by control under s. 407.106, 409.104, 409.105, or 409.107 when the secured party obtains UCC - SECURED TRANSACTIONS 409.31617 control and remains perfected by control only while the secured party retains control.
(3) INVESTMENT PROPERTY: TIME OF PERFECTION BY CONTROL; CONTINUATION OF PERFECTION. A security interest in investment property is perfected by control under s. 409.106 from the time the secured party obtains control and remains perfected by control until:
(a) The secured party does not have control; and (b) One of the following occurs: 1. If the collateral is a certificated security, the debtor has or acquires possession of the security certificate; 2. If the collateral is an uncertificated security, the issuer has registered or registers the debtor as the registered owner; or 3. If the collateral is a security entitlement, the debtor is or becomes the entitlement holder.