Press release content from Business Wire. The AP news staff was not involved in its creation. Hazelrigg Claims Management Services Merges with TRISTAR Insurance Group, Inc. March 5, 2021 GMT LONG BEACH, Calif.--(BUSINESS WIRE)--Mar 4, 2021-- Hazelrigg Claims Management Services ( HCMS ) has merged with TRISTAR Insurance Group, Inc. ( TRISTAR ), the largest privately owned, independent third-party claims administrator in the United States. The transaction is effective January 1 st, 2021. ADVERTISEMENT TRISTAR and HCMS both have impressive reputations for quality customer service within the risk management community. This merger is a significant strategic step in expanding TRISTAR’s footprint, and the combined company will create a diversified portfolio in the California market.