Oregon Revised Statutes Corporations and Partnerships § 63.245

(a) The date the initial articles of organization are filed; or

(b) The date stated in the records of the limited liability company as the date the person becomes a member.

(a) In the case of a person acquiring a membership interest directly from the limited liability company, upon the consent of a majority of the members;

(b) In the case of an assignee of a limited liability company membership interest not governed by paragraph (c) of this section, upon the consent of a majority of the members other than the assignor; or

(c) In the case of an assignee of a membership interest in a limited liability company in which, immediately following the assignment, the limited liability company otherwise would have no members, simultaneously with and upon the assignment of the membership interest.