Mich. Comp. Laws § 440.9309: Security interest perfected upon attachment.

Sec. 9309.

Each of the following security interests is perfected when it attaches:

A purchase-money security interest in consumer goods, except as otherwise provided in section 9311(2) with respect to consumer goods that are subject to a statute or treaty described in section 9311(1).

An assignment of accounts or payment intangibles which does not by itself or in conjunction with other assignments to the same assignee transfer a significant part of the assignor's outstanding accounts or payment intangibles.

A sale of a payment intangible.

A sale of a promissory note.

A security interest created by the assignment of a health-care-insurance receivable to the provider of the health-care goods or services.

A security interest arising under section 2401, 2505, 2711(3), or 2A508(5), until the debtor obtains possession of the collateral.

A security interest of a collecting bank arising under section 4210.

A security interest of an issuer or nominated person arising under section 5118.

A security interest arising in the delivery of a financial asset under section 9206(3).

A security interest in investment property created by a broker or securities intermediary.

A security interest in a commodity contract or a commodity account created by a commodity intermediary.

An assignment for the benefit of all creditors of the transferor and subsequent transfers by the assignee thereunder.

A security interest created by an assignment of a beneficial interest in a decedent's estate.