Wyo. Stat. § 26-35-103: Prohibited practices.

(a) It is unlawful for any insurer to cancel, nonrenew or renew a policy of insurance except in compliance with the requirements of this chapter.

(b) Mid-term cancellation of an entire block, line or class of business is presumed to be unfair, inequitable, deceptive, contrary to the public interest or a method and practice rendering the further transaction of insurance in this state injurious to policyholders or to the public and is hereby declared to be unlawful.

(c) If a policy has been issued for a term longer than one (1) year, and for additional premium consideration an annual premium has been guaranteed, it shall be unlawful for the insurer to increase that annual premium during the term of that policy.