TRISTAR Insurance, an independent third-party claims administrator in the US, completed the acquisition of Aspen Risk Management, a provider of loss control and safety services to America’s premier insurance carriers, captives, and brokers. Financial terms were not disclosed. "For the past 15 years our team has worked hard to become exceptional at risk control and workplace safety. Joining TRISTAR gives us the chance to carry our primary purpose of saving lives, preventing injuries & illnesses, and protecting our clients from harm all across America,” Steve Thompson, Aspen CEO.