What it owns

UnitedHealth Group reports four segments. Put them side by side and you are looking at most of a health system owned by one company.

• UnitedHealthcare — $344.9B in 2025. The insurance plan itself. • Optum Rx — $154.7B. One of the largest pharmacy benefit managers in the country; it filled 1.66 billion adjusted prescriptions last year. • Optum Health — $102.0B. The care delivery arm: clinics, surgery centres and home care. It served about 95 million people, down from 100 million a year earlier — this half is shrinking, not growing. • Optum Insight — $19.4B. Data, software and revenue-cycle services sold to hospitals and other insurers, plus Optum Financial and Optum Bank, which held nearly 26 million consumer accounts and more than $27B of assets at year end.

The boxes are ranked by revenue, not drawn to scale — read the numbers, not the rectangles.

Now the part most people get wrong. This is usually filed under "private health insurance," but the biggest customer by far is the taxpayer. Medicare & Retirement brought in $171.3B and Community & State, which runs Medicaid plans, another $94.4B. The company states plainly in its 10-K that premium revenue from the Centers for Medicare & Medicaid Services was 44% of total consolidated revenue in 2025.

Owning several links of one chain is legal and disclosed, and nothing here says anything improper happened. It does mean that a single company's decisions reach your plan, your prescription and in some places your doctor's office at the same time — and that a large share of the money funding all of it is public.

Sources: UnitedHealth Group Form 10-K for the year ended 31 December 2025 (SEC EDGAR, filed 2 March 2026). Not financial advice.