Merck & Co. (MRK) vs AstraZeneca (AZN)
Merck & Co. (MRK) and AstraZeneca (AZN) side by side: both in Healthcare, listed on New York Stock Exchange and London Stock Exchange. Merck & Co. is the larger of the two by approximate market capitalization (about 1.1×).
| Field | Merck & Co. | AstraZeneca |
|---|---|---|
| Legal name | Merck & Co., Inc. | AstraZeneca PLC |
| Ticker | MRK | AZN |
| Exchange | New York Stock Exchange XNYS | London Stock Exchange XLON |
| Jurisdiction | United States | United Kingdom |
| Sector | Healthcare | Healthcare |
| Industry | Pharmaceuticals | Pharmaceuticals |
| Market cap ≈ | $250bn | $230bn |
| Founded | 1891 | 1999 |
| Reporting currency | USD | GBP |
| LEI | 4YV9Y5M8S0BRK1RP0397 | PY6ZZQWO2IZFZC3IOL08 |
| ISIN | US58933Y1055 | GB0009895292 |
| FIGI | BBG001S5TC52 | BBG001SCNW31 |
| Index membership | S&P 500 | FTSE 100 |
| 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.
AstraZeneca
Anglo-Swedish pharmaceutical company formed by the 1999 merger of Astra AB and Zeneca Group, with major franchises in oncology, cardiovascular and rare diseases. One of the largest companies on the London Stock Exchange.
Approximate reference values (seed-0.6 · 2026-08-29) — not real-time, not investment advice. Both sides as data: /api/v1/companies/merck · /api/v1/companies/astrazeneca