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Diagnostics & Research
Stocks Ranked by
Market Capitalization

Name Market cap Price Price
change %
TMO icon
1
Thermo Fisher Scientific
TMO
$214B
$214B $576.46 0.01%
DHR icon
2
Danaher
DHR
$138B
$138B $196.49 1.29%
IDXX icon
3
Idexx Laboratories
IDXX
$44.9B
$44.9B $569.77 0.04%
IQV icon
4
IQVIA
IQV
$40.7B
$40.7B $247.56 1.9%
A icon
5
Agilent Technologies
A
$39.6B
$39.6B $140.30 0.17%
WAT icon
6
Waters Corp
WAT
$37.3B
$37.3B $379.48 1.15%
NTRA icon
7
Natera
NTRA
$36.4B
$36.4B $253.82 0.63%
ILMN icon
8
Illumina
ILMN
$29.5B
$29.5B $194.82 0.95%
MTD icon
9
Mettler-Toledo International
MTD
$28.1B
$28.1B $1,388.33 0%
DGX icon
10
Quest Diagnostics
DGX
$26B
$26B $235.22 0.31%
LH icon
11
Labcorp
LH
$25.2B
$25.2B $307.15 2.25%
GH icon
12
Guardant Health
GH
$19.1B
$19.1B $144.07 0.31%
MEDP icon
13
Medpace
MEDP
$16.3B
$16.3B $584.93 2.44%
ICLR icon
14
Icon
ICLR
$13.7B
$13.7B $178.18 1.14%
RVTY icon
15
Revvity
RVTY
$12.6B
$12.6B $113.37 1.67%
CRL icon
16
Charles River Laboratories
CRL
$11.3B
$11.3B $234.80 2.34%
QGEN icon
17
Qiagen
QGEN
$8.62B
$8.62B $41.81 1.11%
BLLN
18
BillionToOne Inc
BLLN
$6.1B
$6.1B $132.52 0.84%
TWST icon
19
Twist Bioscience
TWST
$5.32B
$5.32B $85.47 3.48%
SHC icon
20
Sotera Health
SHC
$5B
$5B $17.53 1.3%
RDNT icon
21
RadNet
RDNT
$4.98B
$4.98B $63.37 0.24%
VCYT icon
22
Veracyte
VCYT
$4.45B
$4.45B $55.71 0.11%
ADPT icon
23
Adaptive Biotechnologies
ADPT
$3.61B
$3.61B $22.56 0.18%
GRAL
24
GRAIL Inc
GRAL
$2.72B
$2.72B $63.44 1.52%
NEO icon
25
NeoGenomics
NEO
$1.99B
$1.99B $15.27 14%
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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 49 Diagnostics & Research industry stocks tracked by Wall St. Rank, worth a combined $785B.

The largest by market cap are Thermo Fisher Scientific (TMO) at $214B, Danaher (DHR) at $138B and Idexx Laboratories (IDXX) at $44.9B.

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.