Meaning of MET in health insurance?

MET stands for Multiple Employer Trust. This is a method of combining many different employers into a group so that the risk of claims is much less as a group than individually. This is done so if you have an employer group of say 15 employees, and one person gets some type of cancer, the rates for this loss is therefore spread not over a group of 15 but a group of maybe 15,000 employees instead.