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NAICS 541380:
Testing Laboratories and Services

This industry comprises establishments primarily engaged in performing physical, chemical, and other analytical testing services, such as acoustics or vibration testing, assaying, biological testing (except medical and veterinary), calibration testing, electrical and electronic testing, geotechnical testing, mechanical testing, nondestructive testing, or thermal testing. The testing may occur in a laboratory or on-site.

Assaying servicesX-ray inspection servicesRadiography inspection services+5 examples
Food testing laboratories or servicesSeed testing laboratories or servicesSoil testing laboratories or servicesAutomobile proving and testing groundsRadon testing laboratories or services

Matching SIC code: 8734 Testing Laboratories

Where it sits

  1. 54Professional, Scientific, and Technical ServicesSector
  2. 541Professional, Scientific, and Technical ServicesSubsector
  3. 5413Architectural, Engineering, and Related ServicesIndustry group
  4. 54138Testing Laboratories and ServicesNAICS industry
  5. 541380Testing Laboratories and ServicesNational industry

Largest companies with NAICS 541380

Updated Nov 9, 2026
RankCompanyHeadquartersEmployees
1
UL Solutionsul.com
Northbrook, US15K
2
Acurenacuren.com
Houston, US4.8K
3
AmSpec Groupamspecgroup.com
Cranbury, US4.4K
4
MISTRAS Groupmistrasgroup.com
West Windsor Township, US3.9K
5
NSFnsf.org
Ann Arbor, US3.5K
6
Eurofins Lancaster Laboratorieseurofins.com
Lancaster, US3.5K
7
Pace® Analytical Servicespacelabs.com
Minneapolis, US3.2K
8
Sotera Health Companysoterahealth.com
Broadview Heights, US2.4K
9
Stratosphere Qualitystratospherequality.com
Fishers, US1.8K
10
Applied Technical Services, LLCatslab.com
Marietta, US1.7K

Not this code?

Similar activities the Census classifies elsewhere.

Questions about NAICS 541380

Which businesses use NAICS 541380?
Assaying services, x-ray inspection services and radiography inspection services, and similar businesses in the Professional, Scientific, and Technical Services sector. This industry comprises establishments primarily engaged in performing physical, chemical, and other analytical testing services, such as acoustics or vibration testing, assaying, biological testing (except medical and veterinary), calibration testing, electrical and electronic testing, geotechnical testing, mechanical testing, nondestructive testing, or thermal testing.
What SIC code matches NAICS 541380?
SIC 8734, Testing Laboratories, from the US Census Bureau's concordance between the two systems.
How many companies have NAICS 541380?
7,867 companies with a website carry NAICS 541380 as their primary code in Crustdata's data, worldwide.
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Code titles, definitions, examples and SIC matches: NAICS 2022 and the Census concordances, US Census Bureau. Company counts and lists: Crustdata, companies with a website, each by its primary code, updated weekly. Employee counts are estimates.