Oregon Revised Statutes Corporations and Partnerships § 60.177

(1) A corporation may acquire its own shares and shares so acquired constitute authorized but unissued shares.

(2) If the articles of incorporation prohibit the reissue of acquired shares, the number of authorized shares is reduced by the number of shares acquired, effective upon amendment of the articles of incorporation.

(3) If pursuant to this section, the number of authorized shares is reduced, articles of amendment shall be adopted by the board of directors which may be without shareholder action and shall be delivered to the office for filing. The articles shall set forth:

(4) For purposes of this section, if shares of one class or series of a corporation are converted into shares of another class or series of the corporation, the shares so converted shall be considered to have been acquired by the corporation.