What is NAICS 541990?

NAICS 541990 is the federal industry code for All Other Professional, Scientific & Technical Services. The Census Bureau maintains the NAICS taxonomy; federal contracting officers use it to classify solicitations and confirm bidder eligibility.

How do I bid on federal contracts as a small business in NAICS 541990?

Register your business in SAM.gov, get a UEI, and confirm your NAICS code matches the solicitation's primary NAICS. Then write a capability statement that maps your past performance to the work in the RFP. Themis automates the matching and gives you a free AI brief for every active opportunity.

Do I need a SAM.gov registration to bid?

Yes — every federal contract award above the micro-purchase threshold requires the vendor to have an active SAM.gov registration with a Unique Entity Identifier (UEI) and the relevant NAICS codes listed on the registration.

What set-asides apply to NAICS 541990?

Common federal set-asides — Small Business (SBA), 8(a), HUBZone, SDVOSB, WOSB, EDWOSB — apply per solicitation, not per NAICS code. Each opportunity declares its own set-aside; Themis displays the eligibility class on every card so you can filter to ones you qualify for.

Federal contracts · NAICS 541990

Federal contracts for NAICS 541990 — All Other Professional, Scientific & Technical Services

Live federal + LA municipal opportunities under NAICS 541990, plus the contracting officers, top primes, and agencies that actually buy this work.

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4 active solicitations·4 federal agencies·Last refreshed Jul 2, 2026

Active opportunities in NAICS 541990

Refreshed continuously from SAM.gov and partner agencies. Showing the 4 most-urgent active solicitations.

FBI - Redstone ArsenalServicesSmall Business Set-Aside

Services to Support Training Development

Top primes in NAICS 541990

Federal primes ranked by total obligated dollars under NAICS 541990 over the last 5 fiscal years. Source: USAspending.gov.

#1
BATTELLE ENERGY ALLIANCE, LLC1 contract · Department of Energy
$26.1B
#2
MASSACHUSETTS INSTITUTE OF TECHNOLOGY5 contracts · Department of Defense
$6.0B
#3
OAK RIDGE ASSOCIATED UNIVERSITIES, INCORPORATED3 contracts · Department of Energy
$5.3B
#4
THE MITRE CORPORATION14 contracts · Department of Defense
$5.1B

Agencies buying NAICS 541990

The top federal customers historically active in NAICS 541990by obligated dollars. Match your past performance to the agency that’s most likely to write your next contract.

#1
Department of Energy3 contracts
$31.3B
#2
Department of Defense58 contracts
$24.3B
#3
Agency for International Development19 contracts
$7.2B
#4
Department of Health and Human Services12 contracts
$3.3B

Free capability statement builder for NAICS 541990 contractors

One-page PDF in proposal-grade prose. UEI, NAICS, certifications, past performance, and differentiators — the document contracting officers actually skim during sources-sought market research. No account required.

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Frequently asked questions

What is NAICS 541990?: NAICS 541990 is the federal industry code for All Other Professional, Scientific & Technical Services. The Census Bureau maintains the NAICS taxonomy; federal contracting officers use it to classify solicitations and confirm bidder eligibility.
How do I bid on federal contracts as a small business in NAICS 541990?: Register your business in SAM.gov, get a UEI, and confirm your NAICS code matches the solicitation's primary NAICS. Then write a capability statement that maps your past performance to the work in the RFP. Themis automates the matching and gives you a free AI brief for every active opportunity.
Do I need a SAM.gov registration to bid?: Yes — every federal contract award above the micro-purchase threshold requires the vendor to have an active SAM.gov registration with a Unique Entity Identifier (UEI) and the relevant NAICS codes listed on the registration.
What set-asides apply to NAICS 541990?: Common federal set-asides — Small Business (SBA), 8(a), HUBZone, SDVOSB, WOSB, EDWOSB — apply per solicitation, not per NAICS code. Each opportunity declares its own set-aside; Themis displays the eligibility class on every card so you can filter to ones you qualify for.

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