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Diagnostics & Research
Stocks Ranked by
Market Capitalization

Name Market cap Price Price
change %
TMO icon
1
Thermo Fisher Scientific
TMO
$196B
$196B $526.23 1.17%
DHR icon
2
Danaher
DHR
$142B
$142B $201.11 1.33%
IDXX icon
3
Idexx Laboratories
IDXX
$44.5B
$44.5B $563.81 0.64%
NTRA icon
4
Natera
NTRA
$37.6B
$37.6B $262.63 3.23%
A icon
5
Agilent Technologies
A
$36.8B
$36.8B $130.26 0.91%
WAT icon
6
Waters Corp
WAT
$35.1B
$35.1B $357.54 3.1%
IQV icon
7
IQVIA
IQV
$34B
$34B $203.90 1.14%
ILMN icon
8
Illumina
ILMN
$27.9B
$27.9B $184.68 1.06%
MTD icon
9
Mettler-Toledo International
MTD
$25.7B
$25.7B $1,273.77 2.77%
LH icon
10
Labcorp
LH
$23.1B
$23.1B $281.48 0.66%
DGX icon
11
Quest Diagnostics
DGX
$23B
$23B $207.66 1.43%
GH icon
12
Guardant Health
GH
$19.6B
$19.6B $148.07 5%
MEDP icon
13
Medpace
MEDP
$15.1B
$15.1B $527.93 1.82%
ICLR icon
14
Icon
ICLR
$12.8B
$12.8B $166.18 2.25%
RVTY icon
15
Revvity
RVTY
$11.9B
$11.9B $106.44 3.37%
CRL icon
16
Charles River Laboratories
CRL
$10.6B
$10.6B $219.70 2.07%
QGEN icon
17
Qiagen
QGEN
$8.35B
$8.35B $40.48 1.63%
BLLN
18
BillionToOne Inc
BLLN
$5.76B
$5.76B $125.14 3.97%
TWST icon
19
Twist Bioscience
TWST
$5.45B
$5.45B $87.45 6.82%
SHC icon
20
Sotera Health
SHC
$4.97B
$4.97B $17.42 1.86%
RDNT icon
21
RadNet
RDNT
$4.77B
$4.77B $60.68 2.43%
VCYT icon
22
Veracyte
VCYT
$4.57B
$4.57B $57.26 3.16%
ADPT icon
23
Adaptive Biotechnologies
ADPT
$3.5B
$3.5B $21.86 4.62%
GRAL
24
GRAIL Inc
GRAL
$2.96B
$2.96B $68.91 5.11%
CDNA icon
25
CareDx
CDNA
$1.98B
$1.98B $38.37 3.42%
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Diagnostics & Research Stocks at a Glance

Diagnostics and research companies run laboratory testing, imaging, and analytical services, and supply the instruments behind them. Testing volumes are recurring and largely non-discretionary, while research-tools demand follows pharma and academic R&D budgets.

There are 47 Diagnostics & Research industry stocks tracked by Wall St. Rank, worth a combined $746B.

The largest by market cap are Thermo Fisher Scientific (TMO) at $196B, Danaher (DHR) at $142B and Idexx Laboratories (IDXX) at $44.5B.

Among institutional investors, Waters Corp (WAT) drew the most net new fund positions in Q1 2026: 461 funds opened new positions, taking total fund holders up 365 (45%) quarter-over-quarter.

Market caps and prices updated daily; fund activity based on aggregated SEC 13F filings for Q1 2026.