United States

Top 70 largest US Companies in the Diagnostics & Research industry by Market Cap

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

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Top Diagnostics & Research Companies from the United States as of Jul. 01, 2025

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Rank Company Market Cap (USD) Country Sector Industry
1 Thermo Fisher Scientific Inc. $162.07 B United States US Healthcare US Diagnostics & Research
2 Danaher Corporation $144.92 B United States US Healthcare US Diagnostics & Research
3 IDEXX Laboratories, Inc. $43.99 B United States US Healthcare US Diagnostics & Research
4 Agilent Technologies, Inc. $34.28 B United States US Healthcare US Diagnostics & Research
5 DexCom, Inc. $32.77 B United States US Healthcare US Diagnostics & Research
6 IQVIA Holdings Inc. $28.41 B United States US Healthcare US Diagnostics & Research
7 Mettler-Toledo International Inc. $25.13 B United States US Healthcare US Diagnostics & Research
8 Natera, Inc. $22.09 B United States US Healthcare US Diagnostics & Research
9 Laboratory Corporation of America Holdings $21.92 B United States US Healthcare US Diagnostics & Research
10 Waters Corporation $20.94 B United States US Healthcare US Diagnostics & Research
11 Quest Diagnostics Incorporated $19.71 B United States US Healthcare US Diagnostics & Research
12 Illumina, Inc. $15.88 B United States US Healthcare US Diagnostics & Research
13 Revvity, Inc. $11.89 B United States US Healthcare US Diagnostics & Research
14 Exact Sciences Corporation $10.07 B United States US Healthcare US Diagnostics & Research
15 Medpace Holdings, Inc. $9.37 B United States US Healthcare US Diagnostics & Research
16 Charles River Laboratories International, Inc. $7.72 B United States US Healthcare US Diagnostics & Research
17 Guardant Health, Inc. $6.26 B United States US Healthcare US Diagnostics & Research
18 Lantheus Holdings, Inc. $5.56 B United States US Healthcare US Diagnostics & Research
19 Syneos Health, Inc. $4.38 B

(July 1, 2023)

 United States US Healthcare US Diagnostics & Research
20 Soleno Therapeutics, Inc. $4.37 B United States US Healthcare US Diagnostics & Research
21 RadNet, Inc. $4.22 B United States US Healthcare US Diagnostics & Research
22 Ortho Clinical Diagnostics Holdings plc $4.19 B

(May 1, 2022)

 United States US Healthcare US Diagnostics & Research
23 Sotera Health Company $3.33 B United States US Healthcare US Diagnostics & Research
24 Twist Bioscience Corporation $2.29 B United States US Healthcare US Diagnostics & Research
25 Quidel Corporation $2.04 B United States US Healthcare US Diagnostics & Research
26 Meridian Bioscience, Inc. $1.47 B

(Jan. 1, 2023)

 United States US Healthcare US Diagnostics & Research
27 Neogen Corporation $1.16 B United States US Healthcare US Diagnostics & Research
28 OPKO Health, Inc. $1.08 B United States US Healthcare US Diagnostics & Research
29 CareDx, Inc $1.07 B United States US Healthcare US Diagnostics & Research
30 NeoGenomics, Inc. $971.6 M United States US Healthcare US Diagnostics & Research

Top Diagnostics & Research Companies from the United States as of Jul. 01, 2025

1. Thermo Fisher Scientific

Company Profile: Thermo Fisher Scientific Inc.
Market Cap (USD): $162.07 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

2. Danaher

Company Profile: Danaher Corporation
Market Cap (USD): $144.92 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

3. IDEXX Laboratories, Inc.

Company Profile: IDEXX Laboratories, Inc.
Market Cap (USD): $43.99 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

4. Agilent Technologies, Inc.

Company Profile: Agilent Technologies, Inc.
Market Cap (USD): $34.28 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

5. DexCom, Inc.

Company Profile: DexCom, Inc.
Market Cap (USD): $32.77 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

6. IQVIA Holdings Inc.

Company Profile: IQVIA Holdings Inc.
Market Cap (USD): $28.41 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

7. Mettler-Toledo International Inc.

Company Profile: Mettler-Toledo International Inc.
Market Cap (USD): $25.13 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

8. Natera, Inc.

Company Profile: Natera, Inc.
Market Cap (USD): $22.09 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

9. Laboratory Corporation of America Holdings

Company Profile: Laboratory Corporation of America Holdings
Market Cap (USD): $21.92 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

10. Waters Corporation

Company Profile: Waters Corporation
Market Cap (USD): $20.94 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

11. Quest Diagnostics Incorporated

Company Profile: Quest Diagnostics Incorporated
Market Cap (USD): $19.71 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

12. Illumina, Inc.

Company Profile: Illumina, Inc.
Market Cap (USD): $15.88 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

13. Revvity, Inc.

Company Profile: Revvity, Inc.
Market Cap (USD): $11.89 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

14. Exact Sciences Corporation

Company Profile: Exact Sciences Corporation
Market Cap (USD): $10.07 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

15. Medpace Holdings, Inc.

Company Profile: Medpace Holdings, Inc.
Market Cap (USD): $9.37 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

16. Charles River Laboratories International, Inc.

Company Profile: Charles River Laboratories International, Inc.
Market Cap (USD): $7.72 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

17. Guardant Health, Inc.

Company Profile: Guardant Health, Inc.
Market Cap (USD): $6.26 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

18. Lantheus Holdings, Inc.

Company Profile: Lantheus Holdings, Inc.
Market Cap (USD): $5.56 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

19. Syneos Health, Inc.

Company Profile: Syneos Health, Inc.
Market Cap (USD): $4.38 B (July 1, 2023)
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

20. Soleno Therapeutics, Inc.

Company Profile: Soleno Therapeutics, Inc.
Market Cap (USD): $4.37 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

21. RadNet, Inc.

Company Profile: RadNet, Inc.
Market Cap (USD): $4.22 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

22. Ortho Clinical Diagnostics Holdings plc

Company Profile: Ortho Clinical Diagnostics Holdings plc
Market Cap (USD): $4.19 B (May 1, 2022)
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

23. Sotera Health Company

Company Profile: Sotera Health Company
Market Cap (USD): $3.33 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

24. Twist Bioscience Corporation

Company Profile: Twist Bioscience Corporation
Market Cap (USD): $2.29 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

25. Quidel Corporation

Company Profile: Quidel Corporation
Market Cap (USD): $2.04 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

26. Meridian Bioscience, Inc.

Company Profile: Meridian Bioscience, Inc.
Market Cap (USD): $1.47 B (Jan. 1, 2023)
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

27. Neogen Corporation

Company Profile: Neogen Corporation
Market Cap (USD): $1.16 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

28. OPKO Health, Inc.

Company Profile: OPKO Health, Inc.
Market Cap (USD): $1.08 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

29. CareDx, Inc

Company Profile: CareDx, Inc
Market Cap (USD): $1.07 B
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

30. NeoGenomics, Inc.

Company Profile: NeoGenomics, Inc.
Market Cap (USD): $971.6 M
Country: United States
Sector: US Healthcare
Industry: US Diagnostics & Research

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