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Top 148 largest Companies in the Diagnostics & Research industry in the World by Market Cap

This is the list of the largest public listed companies in the Diagnostics & Research industry in the world by market capitalization with links to their reference stock.

World Diagnostics & Research Industry Analysis
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Top Diagnostics & Research Companies in the World as of Jan. 01, 2026

Rank Company Market Cap (USD) Country Sector Industry
1 Thermo Fisher Scientific Inc. $222.61 B United States US Healthcare US Diagnostics & Research
2 Danaher Corporation $164.98 B United States US Healthcare US Diagnostics & Research
3 Siemens Healthineers AG $57.84 B Germany German Healthcare German Diagnostics & Research
4 IDEXX Laboratories, Inc. $53.62 B United States US Healthcare US Diagnostics & Research
5 Lonza Group Ltd $47.58 B Switzerland Swiss Healthcare Swiss Diagnostics & Research
6 WuXi AppTec Co. Ltd $40.22 B China Chinese Healthcare Chinese Diagnostics & Research
7 Agilent Technologies, Inc. $39.11 B United States US Healthcare US Diagnostics & Research
8 IQVIA Holdings Inc. $38.38 B United States US Healthcare US Diagnostics & Research
9 Natera, Inc. $31.91 B United States US Healthcare US Diagnostics & Research
10 Mettler-Toledo International Inc. $29.07 B United States US Healthcare US Diagnostics & Research
11 DexCom, Inc. $26.09 B United States US Healthcare US Diagnostics & Research
12 Koninklijke Philips N.V. $25.82 B Netherlands Dutch Healthcare Dutch Diagnostics & Research
13 Waters Corporation $22.74 B United States US Healthcare US Diagnostics & Research
14 Laboratory Corporation of America Holdings $20.91 B United States US Healthcare US Diagnostics & Research
15 Illumina, Inc. $20.65 B United States US Healthcare US Diagnostics & Research
16 Quest Diagnostics Incorporated $19.43 B United States US Healthcare US Diagnostics & Research
17 Exact Sciences Corporation $19.31 B United States US Healthcare US Diagnostics & Research
18 Medpace Holdings, Inc. $16.08 B United States US Healthcare US Diagnostics & Research
19 BioMérieux SA $15.18 B France French Healthcare French Diagnostics & Research
20 ICON Public Limited Company $14.67 B Ireland Irish Healthcare Irish Diagnostics & Research
21 Guardant Health, Inc. $13.21 B United States US Healthcare US Diagnostics & Research
22 Eurofins Scientific SE $12.86 B Luxembourg Luxembourg Healthcare Luxembourg Diagnostics & Research
23 Revvity, Inc. $11.39 B United States US Healthcare US Diagnostics & Research
24 Charles River Laboratories International, Inc. $9.96 B United States US Healthcare US Diagnostics & Research
25 Qiagen N.V. $9.80 B Netherlands Dutch Healthcare Dutch Diagnostics & Research
26 Hangzhou Tigermed Consulting Co. Ltd $7.26 B China Chinese Healthcare Chinese Diagnostics & Research
27 Sysmex Corp $5.91 B Japan Japanese Healthcare Japanese Diagnostics & Research
28 RadNet, Inc. $5.48 B United States US Healthcare US Diagnostics & Research
29 Sotera Health Company $5.03 B United States US Healthcare US Diagnostics & Research
30 Celcuity Inc. $4.65 B United States US Healthcare US Diagnostics & Research

Top Diagnostics & Research Companies in the World as of Jan. 01, 2026

1. Thermo Fisher Scientific

Company Profile: Thermo Fisher Scientific Inc.
Market Cap (USD): $222.61 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

2. Danaher

Company Profile: Danaher Corporation
Market Cap (USD): $164.98 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

3. Siemens Healthineers AG

Company Profile: Siemens Healthineers AG
Market Cap (USD): $57.84 B
Country: Germany
Sector: German Healthcare
Industry: German Diagnostics & Research

4. IDEXX Laboratories, Inc.

Company Profile: IDEXX Laboratories, Inc.
Market Cap (USD): $53.62 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

5. Lonza Group Ltd

Company Profile: Lonza Group Ltd
Market Cap (USD): $47.58 B
Country: Switzerland
Sector: Swiss Healthcare
Industry: Swiss Diagnostics & Research

6. WuXi AppTec

Company Profile: WuXi AppTec Co. Ltd
Market Cap (USD): $40.22 B
Country: China
Sector: Chinese Healthcare
Industry: Chinese Diagnostics & Research

7. Agilent Technologies, Inc.

Company Profile: Agilent Technologies, Inc.
Market Cap (USD): $39.11 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

8. IQVIA Holdings Inc.

Company Profile: IQVIA Holdings Inc.
Market Cap (USD): $38.38 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

9. Natera, Inc.

Company Profile: Natera, Inc.
Market Cap (USD): $31.91 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

10. Mettler-Toledo International Inc.

Company Profile: Mettler-Toledo International Inc.
Market Cap (USD): $29.07 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

11. DexCom, Inc.

Company Profile: DexCom, Inc.
Market Cap (USD): $26.09 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

12. Koninklijke Philips N.V.

Company Profile: Koninklijke Philips N.V.
Market Cap (USD): $25.82 B
Country: Netherlands
Sector: Dutch Healthcare
Industry: Dutch Diagnostics & Research

13. Waters Corporation

Company Profile: Waters Corporation
Market Cap (USD): $22.74 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

14. Laboratory Corporation of America Holdings

Company Profile: Laboratory Corporation of America Holdings
Market Cap (USD): $20.91 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

15. Illumina, Inc.

Company Profile: Illumina, Inc.
Market Cap (USD): $20.65 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

16. Quest Diagnostics Incorporated

Company Profile: Quest Diagnostics Incorporated
Market Cap (USD): $19.43 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

17. Exact Sciences Corporation

Company Profile: Exact Sciences Corporation
Market Cap (USD): $19.31 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

18. Medpace Holdings, Inc.

Company Profile: Medpace Holdings, Inc.
Market Cap (USD): $16.08 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

19. BioMérieux SA

Company Profile: BioMérieux SA
Market Cap (USD): $15.18 B
Country: France
Sector: French Healthcare
Industry: French Diagnostics & Research

20. ICON Public Limited Company

Company Profile: ICON Public Limited Company
Market Cap (USD): $14.67 B
Country: Ireland
Sector: Irish Healthcare
Industry: Irish Diagnostics & Research

21. Guardant Health, Inc.

Company Profile: Guardant Health, Inc.
Market Cap (USD): $13.21 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

22. Eurofins Scientific SE

Company Profile: Eurofins Scientific SE
Market Cap (USD): $12.86 B
Country: Luxembourg
Sector: Luxembourg Healthcare
Industry: Luxembourg Diagnostics & Research

23. Revvity, Inc.

Company Profile: Revvity, Inc.
Market Cap (USD): $11.39 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

24. Charles River Laboratories International, Inc.

Company Profile: Charles River Laboratories International, Inc.
Market Cap (USD): $9.96 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

25. Qiagen N.V.

Company Profile: Qiagen N.V.
Market Cap (USD): $9.80 B
Country: Netherlands
Sector: Dutch Healthcare
Industry: Dutch Diagnostics & Research

26. Hangzhou Tigermed Consulting Co. Ltd

Company Profile: Hangzhou Tigermed Consulting Co. Ltd
Market Cap (USD): $7.26 B
Country: China
Sector: Chinese Healthcare
Industry: Chinese Diagnostics & Research

27. Sysmex Corp

Company Profile: Sysmex Corp
Market Cap (USD): $5.91 B
Country: Japan
Sector: Japanese Healthcare
Industry: Japanese Diagnostics & Research

28. RadNet, Inc.

Company Profile: RadNet, Inc.
Market Cap (USD): $5.48 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

29. Sotera Health Company

Company Profile: Sotera Health Company
Market Cap (USD): $5.03 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

30. Celcuity Inc.

Company Profile: Celcuity Inc.
Market Cap (USD): $4.65 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

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