Reported by Accenture in 2016, there were an estimated 8 million enrollees on private group exchanges. source
A 2017 study published by the Rand Corporation found employees may benefit from greater plan choices. However, if enrollees have trouble understanding the differences between the options, their choices will not necessarily lead to better outcomes. source
A 2017 study published by the Rand Corporation outlined benefits for employers enrolling in private exchanges, including assistance with administrative functions, ACA regulatory compliance, and potential cost savings. However, the report found limited empirical evidence as to the amount of cost savings. They predicted that savings resulted from employee migration to low cost plans. source
Based on a 2015 analysis by Deloitte, 52% of employers were satisfied with their private exchange coverage and 42% believed the exchange had reduced total cost of healthcare. source