According to HUB’s 2026 Employee Benefits Outlook, interest in group captive employee benefits is growing among small- and mid-sized employers, and the cost data explains why. Fully insured health insurance premiums for mid-market employers have increased 8% to 11% in 2026, and on a compounded basis, employer healthcare costs are 62% higher than 2017 levels. For employers absorbing their fourth consecutive year of elevated increases, the case for a fundamentally different funding model has never been stronger.
For mid-sized employers exploring alternative benefits funding strategies, medical stop-loss captives are often the most discussed and the least understood option in the landscape. The concept is compelling: Pool risk with other employers, take control of your claims experience, build solutions that meet your employees where they are and share in the financial upside when your workforce stays healthy. The mechanics are where most leadership teams get stuck.
What is a medical stop-loss captive?
A medical stop-loss captive is a licensed insurance entity created to fund the risks of its members. In a medical stop-loss captive arrangement, multiple employers — typically mid-sized organizations with similar risk profiles — join a shared captive structure. Rather than paying premiums to a traditional carrier and ceding control of their claims experience, member employers fund their own claims within the captive, pool a portion of their risk in a shared layer, share in any claims surplus and collectively manage risk across the group.
Medical stop-loss captives are structured around self-funded health plans, with stop-loss insurance layered in to protect individual members against catastrophic claims. The shared pooled layer provides additional protection above each employer’s individual stop-loss threshold.
Who benefits from a medical stop-loss captive
Medical stop-loss captives aren’t the right fit for every employer. Joining a medical stop-loss captive is a long-term commitment — it isn't a structure employers should enter with the intent to exit after a year or two. Employers also commit a collateral investment that funds the shared risk pool. In programs that run well, employers receive a dividend at year-end on any surplus collateral — one of the few structures where favorable performance translates directly into employer return.
The mid-sized employers seeing the greatest benefits are those who joined with detailed claims data, high-performing programs, engaged leadership and a genuine multi-year commitment to active benefits management. Employers with chronic high-cost claimants or highly variable claims experience may find the captive structure less advantageous or may face more restrictive underwriting terms.
On size, medical stop-loss captives are typically accessible to employers with 150 or more employees, putting them squarely within reach of the mid-sized market that has historically been told these strategies are only available to large corporations. In practice, well-structured medical stop-loss captive programs are increasingly designed with the mid-sized employer in mind.
Other indicators of a strong captive candidate include employers already self-funded or level-funded and looking for the next step, organizations with an existing culture of data-driven decision-making and leadership teams willing to engage in benefits strategy over a multi-year horizon.
What to expect as a medical stop-loss captive member
Joining a medical stop-loss captive is a longer-term commitment than a standard annual insurance renewal. Most captive structures are designed with a three-to-five-year time horizon, and employers should expect a more involved relationship with their benefits data, claims reporting and plan management than they would have under a fully insured arrangement. Employers should be willing to engage in plan design decisions that keep care affordable for their employees, alongside the proactive cost containment work that drives captive performance. In exchange for that engagement, members gain something the traditional carrier model simply doesn’t offer: claims data, cost transparency and direct financial participation in their plan’s performance. For employers serious about managing their healthcare spend over time, the tradeoff is well worth making.
A strategic step, with the right guidance
Medical stop-loss captives offer a sophisticated, proven path to greater control over benefits costs for mid-sized employers, but they require careful evaluation, the right partner relationships and an objective assessment of organizational readiness. The decision to join a captive should be made with a full understanding of the structure, the commitment involved and the realistic range of financial outcomes. For organizations evaluating alternative benefits funding strategies, a medical stop-loss captive for mid-sized employers is among the most powerful options available today.
HUB’s Alternative Risk Solutions (Employee Benefits) Practice specializes in helping small- and mid-sized employers evaluate, structure and manage group captive arrangements, drawing on established relationships across leading captive managers. Connect with a HUB advisor to find out whether a captive is the right next step for your organization.