NAICS 541990: All Other Professional, Scientific, and Technical Services — Federal Contracts

What NAICS 541990 covers

The North American Industry Classification System (NAICS) is the standard the federal government uses to classify the industry of every contractor and every procurement. NAICS 541990 identifies businesses primarily engaged in all other professional, scientific, and technical services. When a contracting officer publishes a solicitation on SAM.gov, they tag it with the NAICS code that best matches the work — which is why getting your NAICS portfolio right inside SAM is the single most important step for showing up in agency searches.

Who buys NAICS 541990?

The federal agencies awarding the most contract value to vendors in this NAICS, based on 107 contractors tracked in the Mindy contractor database:

1. 1Dept Of The Navy
2. 2Federal Acquisition Service
3. 3Dept Of The Air Force
4. 4Dept Of The Army
5. 5Centers For Disease Control And Prevention

Source: aggregated from the Mindy contractor database (prime contractor disclosures via SBA + agency directories).

Top contractors in NAICS 541990

The largest prime contractors associated with NAICS 541990, ranked by total reported federal contract value. These are your most likely incumbents — and your most likely teaming partners on recompetes:

1. 1
   Sierra Nevada Company LLC

   $12.9B total reported value
2. 2
   CACI INC. - Federal

   $8.8B total reported value
3. 3
   Smartronix LLC

   $3.4B total reported value
4. 4
   Hii Mission Technologies CORP

   $3.1B total reported value
5. 5
   Johns Hopkins University

   $2.8B total reported value
6. 6
   Mantech International Corporation

   $2.0B total reported value
7. 7
   The MITRE Corporation

   $1.7B total reported value
8. 8
   Blue Cross And Blue Shield Of South Carolina

   $1.3B total reported value

Values reflect each contractor's aggregate reported federal contract value (across all of their NAICS codes, not just 541990). Use as a ranking signal, not as a per-NAICS award total.