Merck & Co. (MRK) vs UnitedHealth Group (UNH)
Merck & Co. (MRK) and UnitedHealth Group (UNH) side by side: both in Healthcare, both listed on New York Stock Exchange. Merck & Co. is the larger of the two by approximate market capitalization (about 1.0×).
| Field | Merck & Co. | UnitedHealth Group |
|---|---|---|
| Legal name | Merck & Co., Inc. | UnitedHealth Group Incorporated |
| Ticker | MRK | UNH |
| Exchange | New York Stock Exchange XNYS | New York Stock Exchange XNYS |
| Jurisdiction | United States | United States |
| Sector | Healthcare | Healthcare |
| Industry | Pharmaceuticals | Health Insurance |
| Market cap ≈ | $366bn | $352.7bn |
| Founded | 1891 | 1977 |
| Reporting currency | USD | USD |
| LEI | 4YV9Y5M8S0BRK1RP0397 | 549300GHBMY8T5GXDE41 |
| ISIN | US58933Y1055 | US91324P1021 |
| FIGI | BBG001S5TC52 | BBG001S6WCJ1 |
| Index membership | S&P 500 | S&P 500 |
| Held by (covered funds) | — | — |
Merck & Co.
US pharmaceutical major (known as MSD outside North America) whose cancer immunotherapy Keytruda is among the world's best-selling drugs; also strong in vaccines and animal health.
UnitedHealth Group
Largest US health insurer plus Optum health-services and data platform.
What they share
Same indices: S&P 500
Market caps are computed from each issuer's own filed share count times the close on 2026-08-28, not copied from a vendor; LEI from GLEIF (CC0), ISIN read from each issuer's own primary listing document with its ISO 6166 check digit validated, FIGI from OpenFIGI, MIC from the ISO 10383 registry — full provenance on Sources. Not real-time, not investment advice. Both sides as data: /api/v1/companies/merck · /api/v1/companies/unitedhealth