This week we look at health insurance captives, an alternative funding strategy that lets small and mid-size employers capture the upside of self-funding without taking on all the risk alone. It’s one of the faster-growing options in the middle market, and one of the least understood.
What a Captive Actually Is
A captive is an insurance company owned by the businesses it insures. Instead of paying premiums to a traditional carrier and never seeing that money again, a group of employers pools funds into a captive that helps pay their claims. For health benefits, that usually means a “group medical captive,” where a number of like-minded mid-size employers join together to share risk.
How the Layers Work
Think of it as three layers of risk:
- The employer self-funds routine, predictable claims up to a set point, just like any self-funded plan.
- The captive layer covers a middle band of larger claims, and this is where the magic happens: that risk is shared across all the employers in the captive, so one bad year for one member doesn’t sink them.
- Stop-loss (reinsurance) caps the catastrophic claims at the top, so no single member is exposed to a multimillion-dollar case.
Why Employers Like Them
- Cost control: members keep underwriting profit and investment income that would otherwise go to a carrier, and good claims years can come back as dividends or surplus.
- Transparency: employers get real claims data and more say over plan design, networks, and cost-management programs.
- Stability: pooling smooths out the year-to-year swings that make pure self-funding feel risky for a smaller employer.
The Tradeoffs
Captives aren’t a fit for everyone. They tend to reward employers with healthy, engaged populations and a willingness to manage costs actively. There’s capital and collateral to put up, more administrative complexity than a fully insured plan, and real commitment: this is a multi-year strategy, not a one-year experiment. A rough claims stretch can still mean higher contributions, even with the risk-sharing.
Who It’s For
The sweet spot is usually small-to-mid-size employers, often in the 50-to-500-employee range, who are too big to feel good about fully insured rate hikes but not big enough to comfortably self-fund on their own. For the right group, a captive offers the control and savings of self-funding with a built-in safety net.
The Bottom Line
A captive sits in the middle ground between fully insured and going it alone: more control and potential savings than a traditional plan, less exposure than solo self-funding. It’s not for every employer, but for the right one it can turn health benefits from a pure cost center into something they actually have a hand on.