Seventeen states have state-based health insurance marketplaces in 2016. According to a recent analysis:

• 9 have no net change in the number of insurers participating
• 3 have a net gain
• 5 have a small decrease

Source: "Insurer Participation in State-Based Marketplaces in 2016: A Closer Look," The Commonwealth Fund Blog, January 21, 2016, http://www.commonwealthfund.org/publications/blog/2016/jan/insurer-participation-in-state-based-marketplaces-in-2016