Department of Defense NAICS 541990 contractors

All Other Professional, Scientific, and Technical Services. Contractors in this NAICS lane under Department of Defense.

Agency: Department of Defense

Last updated: April 19, 2026

Visible recipients

143

Mapped obligations

$21,850,205,145

Visible recipients tied to Department of Defense and NAICS 541990

Ecs Federal, LLC

Fairfax, VA

Fairfax, VA | 401 awards | Top agency Department of Defense | NAICS 541512

$268,767,158

Cherokee Nation Technology Solutions LLC

Tulsa, OK

Tulsa, OK | 20 awards | Top agency Department of Defense | NAICS 541620

$92,004,433

Modern Technology Solutions, Inc.

Alexandria, VA

Alexandria, VA | 285 awards | Top agency General Services Administration | NAICS 541712

$47,241,939

Walsh Federal LLC

Chicago, IL

Chicago, IL | 169 awards | Top agency Department of Defense | NAICS 236220

$622,102

Amentum National Security Programs, INC

Chantilly, VA

Chantilly, VA | 5 awards | Top agency Department of Defense | NAICS 541990

$205,207,342

Hii Mission Technologies CORP

Willowbrook, IL

Willowbrook, IL | 464 awards | Top agency Department of Defense | NAICS 541330

$1,449,614,863

Cae USA Mission Solutions Inc.

Tampa, FL

Tampa, FL | 5 awards | Top agency Department of Defense | NAICS 336413

$16,276,568

Applied Research Associates, Inc.

Albuquerque, NM

Albuquerque, NM | 564 awards | Top agency Department of Defense | NAICS 541712

$234,311,642

Linquest Corporation

Herndon, VA

Herndon, VA | 249 awards | Top agency Department of Defense | NAICS 541715

$146,089,363

Systems Planning And Analysis, Inc.

Alexandria, VA

Alexandria, VA | 238 awards | Top agency Department of Defense | NAICS 541330

$289,742,292

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