Wyo. Stat. § 31-9-406: Cancellation or termination of insurance; exclusion of named driver.

When an insurance carrier has certified a motor vehicle liability policy under W.S. 31-9-403 or a policy under W.S. 31-9-404, the insurance certified shall not be cancelled, renewed with exclusions pursuant to W.S. 26-35-105 or terminated until at least ten (10) days after a notice of cancellation, renewal with exclusions or termination of the insurance certified is filed with the division, except that a policy subsequently procured and certified shall, on the effective date of its certification, terminate the insurance previously certified with respect to any motor vehicle designated in both certificates.