Colo. Rev. Stat. § 10-3-108
Except pursuant to the provisions of article 5 of this title, no foreign insurance company shall transact any business in this state unless it first files in the office of the commissioner a duly certified copy of its charter, articles of incorporation, or deed of settlement, together with a statement, under oath, of the president and secretary, or other chief officers of such company, showing the condition of affairs of such company on the thirty-first day of December next preceding the date of such oath. The statement shall be in the same form and shall set forth the same particulars as the annual statement required by this title (except article 15) and article 14 of title 24, C.R.S. After filing its articles of incorporation or charter with the secretary of state, no insurance company shall be required to file its annual report or any other instrument, except amendments to said articles of incorporation or charter, in the office of the secretary of state or to pay to the secretary of state an annual corporation tax. The filings required pursuant to this section may be made in an electronic format.
C.R.S. § 10-3-108