Okla. Stat. tit. 12A, § 12A-3-204: Indorsement

INDORSEMENT

(a) "Indorsement" means a signature, other than that of a

signer as maker, drawer, or acceptor, that alone or accompanied by

other words is made on an instrument for the purpose of (i)

negotiating the instrument, (ii) restricting payment of the

instrument, or (iii) incurring indorser's liability on the

instrument, but regardless of the intent of the signer, a signature

and its accompanying words is an indorsement unless the accompanying

words, terms of the instrument, place of the signature, or other

circumstances unambiguously indicate that the signature was made for

a purpose other than indorsement. For the purpose of determining

whether a signature is made on an instrument, a paper affixed to the

instrument is a part of the instrument.

(b) "Indorser" means a person who makes an indorsement.

(c) For the purpose of determining whether the transferee of an

instrument is a holder, an indorsement that transfers a security

interest in the instrument is effective as an unqualified

indorsement of the instrument.

(d) If an instrument is payable to a holder under a name that

is not the name of the holder, indorsement may be made by the holder

in the name stated in the instrument or in the holder's name or

both, but signature in both names may be required by a person paying

or taking the instrument for value or collection.