PrimeOne Insurance Co., Salt Lake City, has appointed Steven Nigro to its board of directors. Nigro is a managing partner of TAG Financial Institutions Group and the vice chairman and lead independent director of Maiden Holdings Ltd. He has more than 25 years of insurance leadership experience. PrimeOne also has named Stephen Greenfield as its chief underwriting officer. He has been with the company since 2015, most recently as president of operations. He has over 25 years of experience in insurance company underwriting and operational roles.