Colo. Rev. Stat. § 7-106-302
ares. (1) A corporation may acquire its own shares, and, except as provided by section 7-117-101 (6), shares so acquired constitute authorized but unissued shares.
(2) If the articles of incorporation prohibit the reissuance of acquired shares:
(b) The corporation shall deliver to the secretary of state, for filing pursuant to part 3 of article 90 of this title, articles of amendment to the articles of incorporation, which are effective without shareholder action, that state:
Source: L. 93: Entire article added, p. 762, § 1, effective July 1, 1994. L. 2002: IP(2)(b) amended, p. 1847, § 109, effective July 1; IP(2)(b) amended, p. 1712, § 109, effective October 1. L. 2003: IP(2)(b) and (2)(b)(I) amended, p. 2317, § 233, effective July 1, 2004.