Who's Who in Your Benefits Stack
Sixteen vendor categories touch your healthcare dollar. Most employers can name two. Here's the whole map in three parts: the vendors every employer has, the stack you meet when you self-fund, and the ones you meet when you hand off the risk.
Follow the Money First
One rule for reading this market.
Every category below has honest operators and extraction artists. The way they get paid usually tells you which one is in the room. Watch for vertical integration too. Your carrier may own your PBM, your "independent" analytics tool, and the specialty pharmacy your claims get steered to.
Part 1 · Any Funding Model
The vendors every employer has.
Fully-insured or self-funded, these categories are already in your stack or knocking on it. Get these relationships right and every decision downstream gets easier.
National Carriers (the BUCAs)
Blue Cross Blue Shield plans, UnitedHealthcare, Cigna, and Aetna (CVS Health). They insure fully-insured groups, rent networks and administration to self-funded ones (ASO), and own much of the rest of this page through subsidiaries: PBMs, provider groups, data firms.
Brokers & Consultants
The channel everything else flows through. Brokers traditionally earn carrier commissions; consultants charge fees. The CAA’s 408(b)(2) disclosure requirement means you no longer have to guess which incentives you’re buying.
Ben Admin, Enrollment & COBRA
The systems layer: enrollment platforms, carrier file feeds, COBRA administration, ACA reporting. Unsexy, and the source of most billing leakage when feeds break.
Data & Analytics
They turn claims files into answers: cost drivers, vendor performance, network comparisons using public Transparency in Coverage files. If you’re self-funded and data-rich but analysis-poor, this is the missing layer.
Part 2 · The Self-Funded Stack
The vendors you meet when you own the plan.
Everything below assumes you, not a carrier, own the plan and its data. In rough order of the money: who runs it, who takes the risk, the pharmacy dollar, the medical dollar, and the people keeping members out of the expensive places.
Independent TPAs
Claims administration for self-funded plans without carrier ownership. They process claims, run member service, and typically hand over your full claims file without an argument. Often more flexible on plan design, RBP, and DPC integration than carrier ASO shops.
Stop-Loss Carriers & MGUs
They insure the employer against catastrophic claims on self-funded plans. Direct writers issue their own paper; managing general underwriters (MGUs) underwrite on behalf of carriers. Contract terms, laser policy, and renewal behavior differ more than logos suggest.
Captive Managers
They organize and run group medical captives: member underwriting, the shared risk layer, governance, and the data discipline that makes pooling work. The good ones reject more applicants than they accept.
PBMs: The Big Three and the Transparent Pass-Through Challengers
They run the drug benefit: formulary, pharmacy network, rebates, claims. CVS Caremark, Express Scripts, and Optum Rx processed roughly 80% of U.S. prescriptions in 2023 per the FTC, and all three are carrier-owned and own their own pharmacies. A transparent pass-through PBM prices at acquisition cost plus a flat disclosed fee and returns 100% of rebates to the plan. The label is marketing. The contract language is the product.
GLP-1 & Obesity Management
They wrap clinical oversight around the most expensive drug question on your plan. Models differ: utilization management inside a care program, behavioral programs with selective drug use, drug-plus-coaching on lower doses, and non-drug metabolic care built on glucose monitoring. The spend is big enough that "cover it all" and "exclude it" are both losing plays.
Reference-Based Pricing Vendors
They reprice claims to a multiple of Medicare, then defend the result: provider negotiations, balance-bill response, member advocacy, sometimes legal defense. The pricing math is easy. The defense operation is the product.
UM, UR & Medical Management
The clinical control layer: precertification, utilization review, case management for catastrophic claims, chronic condition programs. Carriers bundle their own version. Independent firms do the same work without the conflict of reviewing their own network’s charges, and stop-loss carriers tend to price plans better when a credible one is attached.
Direct Primary Care
Flat-fee primary care practices that take no insurance. Paired with a major medical plan, they cut downstream utilization with actual access: same-day visits, real appointment lengths. As of 2026, memberships up to $150/month are HSA-compatible, which removed the big compliance objection.
MSK Point Solutions
Musculoskeletal is usually a top-two claims category, and it’s full of avoidable surgery and stray imaging. These vendors put virtual physical therapy, physician-led clinics, or surgeon-run triage in front of that spend before anyone operates.
Part 3 · Getting Off the Risk
The vendors you meet when you hand the risk to someone else.
Some employers decide the smartest move is to not carry claims risk at all. Two very different roads get you there: hand the whole HR and health stack to a PEO’s co-employment model, or fund individual coverage and let employees buy their own plans. Both trade control for simplicity, and both bury the economics inside a blended rate. So follow the money the same way.
PEOs (Professional Employer Organizations)
Co-employment. The PEO becomes the employer of record for payroll, HR, and benefits, and puts your team on its master health plan. You get big-group buying power, bundled compliance, and someone else carrying the plan. The trade is control and data: it’s their plan, their renewal, and often their claims experience you can’t see.
ICHRA Platforms
They administer individual coverage HRAs: you set a tax-free allowance by employee class, employees buy their own plans on the individual market, and the platform runs shopping, enrollment, compliance, and reimbursement. A different chassis entirely. For multi-state, part-time-heavy, or high-turnover workforces, it can end renewal roulette.
Quick Answers
The transparent PBM questions, answered.
What is a pass-through PBM?
A PBM that charges the plan exactly what the pharmacy gets paid, plus a flat disclosed admin fee, and passes 100% of rebates and manufacturer fees back to the plan. No spread pricing, no retained rebates. Its only revenue is the fee you can see.
Which PBMs offer 100% rebate pass-through?
SmithRx, FairosRx, Ventegra, Drexi, Rightway, and ProAct all market pass-through models and belong in a mid-market RFP. But no list settles it. "100% pass-through" only means something if the contract defines rebates broadly enough to include GPO fees, admin fees, and every other manufacturer payment, and gives you audit rights to check.
How do you verify a PBM actually passes through 100% of rebates?
Three contract terms. First, a rebate definition that captures every form of manufacturer revenue, including GPO and admin fees collected by affiliates. Second, an annual reconciliation with claim-level detail. Third, audit rights with an auditor you pick. If any of the three is missing, assume the difference is their margin.
Go deeper: the contract language that makes pass-through real and where GPO fees hide PBM margin.
Audit your own stack
How much is vendor sprawl costing you?
The Benefits Control System assessment scores the connective tissue between your payroll, HRIS, ben admin, and carriers, and prices the leaks.
Score my stack →Put it to work
Reading is step one. These do the math on your plan.