Colo. Rev. Stat. § 12-100-128
All statements, records, schedules, working papers, and memoranda made by a certified public accountant incident to or in the course of professional service to a client by the certified public accountant, except financial statements submitted by a certified public accountant to a client and books and records prepared for the use of the client, shall be and remain the property of the certified public accountant in the absence of an express agreement to the contrary between the certified public accountant and the client.
C.R.S. § 12-100-128
This section is similar to former § 12-2-130 as it existed prior to 2019.
For the statutory privilege with respect to testimony concerning communications between a certified public accountant and the accountant's client, see § 13-90-107(1)(f).