A group medical captive lets you self-fund your health plan while sharing the middle layer of stop-loss risk with other employers. You keep full control of your own plan design. The pool only touches the stop-loss program.
Most CFOs think the funding model spectrum ends at level-funded or self-funded. It doesn't. Captives sit between standalone self-funding and full insurance. For the right employer, they cut volatility without giving up the upside.
Key takeaways
Group captives generally target the 50–500 life market, although 5-50 and 500+ life captives absolutely exist, most growth is coming from employers under 250 lives.
The captive absorbs a defined middle layer of stop-loss claims, typically from your Individual Stop-Loss Attachment Point, up to $500,000+ per claimant. Catastrophic claims above that go to the commercial carrier.
You own a share of the captive, (may be required to) post collateral, and receive dividends when the pool runs well. Bad years usually result in a smaller dividend or higher premiums for the following year.
Your plan design stays yours. Networks, copays, deductibles, and your TPA are independent of the other captive members.
Underwriting requirements vary dramatically. If they let you in with terrible claims, you should probably question the pool of risk you're joining.
Captives require a 3–5 year commitment. One-year thinking kills the economics for everyone in the pool.
What is a group medical stop-loss captive, exactly?
A group captive is a licensed insurance entity jointly owned by a set of employers. Each employer buys stop-loss coverage from a commercial carrier. That carrier then cedes a defined layer of risk, across all participating members, down into the captive, as described in QBE's overview of medical captive structures.
The commercial carrier stays on top for catastrophic exposure. Think of it as three tiers. The employer absorbs routine claims up to the specific deductible.
The captive absorbs the volatile middle layer. The reinsurer covers the truly catastrophic tail. Each layer has a price, and the captive layer is where the surplus or deficit lives.
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According to Strategic Risk Solutions' Medical Stop Loss overview, the objective is to let mid-market employers replicate the risk profile of a single large company. Spread of risk, cost advantages with vendors, and claims stability. No 200-life employer gets that on its own.
What does the captive layer actually cover?
The specific stop-loss layer inside the captive typically runs from your Individual (specific) Stop-Loss Level per claim up to $500,000+. The commercial carrier handles anything above $500,000+. That middle gap the captive owns, is where most mid-market employers struggle with self-funding claims.
A $280,000 cancer claim. A $400,000 NICU stay. Those are the claims that blow up a standalone self-funded plan's year.
On the aggregate side, the captive's tranche covers losses between roughly 125% and 500% of expected annual claims. Above 500%, the commercial reinsurer steps in. The pooling effect across multiple employers with aligned interests and risk profiles provides the leverage.
When the pool runs better than expected, the surplus flows back to members as dividends. When it runs worse, dividends shrink or disappear. No one sends you a bill for the shortfall. That's the difference between a captive and a direct assessment structure.
What do you actually own, and what does it cost to get in?
You own a proportional share of the captive entity, typically structured as an LLC or a domiciled insurance company. That share entitles you to dividends and a vote on captive governance. You also hold a balance sheet interest in the collateral account.
It's not a mutual fund. But it's not nothing either.
Entry requires two things: a collateral deposit and a clean underwriting file. The collateral, often a letter of credit or cash, covers your potential obligations to the pool. It's returned or credited when you exit, assuming the pool's liabilities are settled.
The amount varies by program and employer size. It's real capital you need to have available, frequently it remains an asset on your books.
Underwriting is the gate most employers underestimate. Captive programs review your prior claims history, your census health profile, and your plan design. A group with active catastrophic claimants may not qualify.
A workforce with high chronic disease prevalence faces the same risk of rejection. Programs protect their existing members.
How big are these programs, and do you control your own plan?
Program size varies. A typical homogeneous (same industry) captive may have 10 to 12 employer members averaging 100 to 500 lives each. Larger homogeneous programs may accommodate 25 or more members with employee headcounts up to 2,500 lives.
Heterogeneous captives mix industries to diversify risk differently. They typically will have larger pools of employers per captive, perhaps as many as a few hundred employer groups sharing risk.
With most captives, participating employers retain full flexibility to set their own coverage, copays, deductibles, provider networks, TPAs and other point solutions. Some captives may have certain requirements (such as not using a BUCA network, or providing incentives for certain vendor partnerships).
Who qualifies, and what disqualifies you?
Most programs target employers with 50 to 500 employees. While underwriting may be more accurate if you've been self-funded or level-funded for at least one plan year, captives can underwrite programs that are fully insured today as well looking to make this change. Stable claims history matters more than company size. Programs want predictable risk, not perfect risk.
What gets you rejected? A large active claimant mid-year is the fastest disqualifier. High prevalence of dialysis, organ transplant history, or certain specialty drug utilization raises flags too. Underwriters aren't guessing. They're protecting the pool's other members.
A 3–5 year commitment is standard. Captives don't work for employers who want to shop carriers every renewal. The economics require consistency across the pool.
What's the actual financial risk if the pool has a bad year?
Your downside is capped. The captive structure limits member exposure to the defined layer and your collateral deposit. You don't absorb unlimited losses from other members' catastrophic claims. The commercial reinsurer holds that tail.
A bad pool year means dividends shrink or disappear. It does not mean a surprise invoice.
Collateral stays at risk until the pool's run-out period closes. Run-out can take 12 to 24 months after exit. Plan for that timeline before you commit.
Frequently asked questions
Can a small employer with 75 lives join a group medical captive?
Yes. Most programs start at 50 lives (with several much smaller). The underwriting requirements are similar regardless of size. Decent claims history and a stable census matter more than headcount.
Do you have to use a specific TPA or network inside the captive?
Rarely. Your TPA, network, and plan design stay independent. The captive only connects at the stop-loss layer. You don't adopt anyone else's plan structure to participate.
What happens to your collateral if you leave the captive?
Collateral is returned or credited after the pool's run-out period closes. That can take 12 to 24 months post-exit. Confirm the run-out timeline before you commit to a program.
How often do captive members actually receive dividends?
Dividend frequency depends on the program and the pool's loss experience. Well-run captives have paid dividends in most years. No program can guarantee them. Treat dividends as upside, not as a budget line.
