"[T]en insurers [have] entered the PRT market since 2014, ... which has resulted in more competition to win deals regardless of the size of the deal ... PRT insurers continue to refine their mortality assumptions and evaluate factors that drive mortality ... leading to a more accurate assessment of mortality risk and better pricing ... PRT insurers are increasingly making use of differentiated investment strategies for their portfolios backing these liabilities, and also using reinsurance as a means to improve pricing."