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NAICS Code· 561990

NAICS 561990: All Other Support Services

This industry comprises establishments primarily engaged in providing day-to-day business and other organizational support services (except office administrative services, facilities support services, employment services, business support services, travel arrangement and reservation services, security and investigation services, services to buildings and other structures, packaging and labeling services, and convention and trade show organizing services). Illustrative Examples: Bartering services Flagging (i.e., traffic control) services Bottle exchanges Float decorating services Inventory taking services Contract meter reading services Lumber grading services Diving services on a contract or fee basis Cross-References. Establishments primarily engaged in--Show more

NAICS 561990 — All Other Support Services encompasses a broad array of specialized, non-standardized support functions that do not fit into more defined categories within the support services sector. This includes niche administrative, logistical, technical, and operational support services such as facility management, specialized staffing, medical logistics, maritime operations support, IT-enabled administrative services, and mission-critical ancillary functions that enable federal agencies to maintain operational continuity.

456
Active Contracts
$918.8M
Total Obligations (12mo)
1.1K
Awarded Contracts (12mo)
472
Contractors Awarded (12mo)
1
Median Bidders per Award
-37.7%
YoY Growth

Industry Spending Overview

Federal obligations, top contractors and agencies, and related industry codes for NAICS 561990.

AI Industry Description

NAICS 561990 — All Other Support Services encompasses a broad array of specialized, non-standardized support functions that do not fit into more defined categories within the support services sector. This includes niche administrative, logistical, technical, and operational support services such as ...

NAICS 561990 — All Other Support Services encompasses a broad array of specialized, non-standardized support functions that do not fit into more defined categories within the support services sector. This includes niche administrative, logistical, technical, and operational support services such as facility management, specialized staffing, medical logistics, maritime operations support, IT-enabled administrative services, and mission-critical ancillary functions that enable federal agencies to maintain operational continuity. These services are often mission-essential but non-core, allowing agencies to focus on primary objectives while outsourcing complex, transient, or highly specialized tasks. In the federal contracting landscape, this NAICS serves as a catch-all for agile, responsive support providers who deliver tailored solutions under tight operational constraints, frequently in high-demand environments. Top contractors in this sector include D2 Government Solutions, Inc., Loui Consulting Group, Inc., Cinteot Inc., Ninety Five South, Inc., Marathon Medical Corporation, MST Maritime Management LLC, Echelon Front, LLC, BHPE LLC, Logistico LLC, 060 Technology Solutions LLC, Suntiff, LLC, Biomedical Research Alliance of New York LLC, and Tech O.R., LLC. The competitive landscape is dominated by small businesses and mid-sized firms with deep domain expertise in niche areas such as medical logistics, maritime operations, and specialized IT support, many of which hold small business set-asides or serve as subcontractors to larger primes. Primary awarding agencies include the Department of Defense, Department of State, Department of Housing and Urban Development, Department of Veterans Affairs, Department of Agriculture, and Department of the Treasury. Demand is driven by mission-enabling needs such as overseas support operations, medical research logistics, housing program administration, and specialized technical staffing for temporary or high-skill roles. The market is characterized by high opportunity density in specialized, non-commodity support services, with frequent use of IDIQs, BPA solicitations, and small business set-asides. Contractors with agile, compliant, and highly responsive service delivery models are best positioned to capture recurring task orders across multiple agencies.

Small Business Size Standard

The SBA threshold that decides who can bid NAICS 561990 work as a small business.

$16.5M
Applies to the whole industry code

The SBA cap for this NAICS (13 CFR 121.201). A business at or under it can self-certify as small for work in this code, which is what makes it eligible for a small-business set-aside. The cap is set per NAICS, so the same company can be small in one code and not in another.

13 CFR 121.201, effective January 1, 2026. The SBA revises the table roughly once a year.

Top Contractors

Companies with the highest total award value under NAICS 561990, ranked by dollars won.

Ranked by total awards
CompanyTotal AwardsContracts
LOCKHEED MARTIN CORPORATION$390.2M89
VERTEX MODERNIZATION AND SUSTAINMENT LLC$180.0M3
GENERAL DYNAMICS INFORMATION TECHNOLOGY, INC.$69.5M1
CHENEGA GLOBAL PROTECTION, LLC$33.4M10
CARDINAL POINT LLC$23.8M3
Y-TECH SERVICES, INC.$17.0M2
LLOYD CONSTRUCTION CO INC$13.2M1
ARCUS GROUP, LLC$12.7M29
YULISTA AEROSPACE & DEFENSE LLC$10.7M2
SIERRA NEVADA COMPANY, LLC$9.1M4

Top Agencies

Federal agencies directing the most contract spending toward NAICS 561990.

Department Of Defense265 awards$677.8M
Department Of Defense (dod)198 awards$90.1M
National Aeronautics And Space Administration21 awards$34.6M
Department Of Homeland Security102 awards$25.8M
Department Of Veterans Affairs191 awards$22.8M
Department Of State (dos)10 awards$22.1M
Department Of Health And Human Services28 awards$9.7M
Defense Commissary Agency1 award$7.7M
Department Of Transportation11 awards$7.0M
Department Of Agriculture44 awards$5.3M

Competition

How many companies historically bid on federal awards in NAICS 561990, from bidder counts reported on USAspending.

Usually Single-Bid

Half or more of reported awards drew exactly one bidder, usually a sign of incumbent-held work rather than an open field. · 46,184 reported awards

Median Bidders

1

Per reported award, all-time

Single-Bid Awards

50%

Share of reported awards with one bidder

10+ Bidder Awards

4%

Share of reported awards with 10+ bidders

Reported Awards

46,184

85% of 54,031 total awards

Bidder Count Distribution by Fiscal Year

Share of reported awards in each bidder-count bracket per federal fiscal year.

How this code compares up the NAICS hierarchy. Parent cohorts pool every code under their prefix, so they are the steadier baseline when a 6-digit sample is thin.

Industry FamilyCompetitionMedian BiddersSingle-BidBidder MixReported Awards
561990This Code
All Other Support Services
Usually Single-Bid150%
46,18485% of 54,031
56199NAICS Industry
Usually Single-Bid150%
46,18485% of 54,031
5619Industry Group
Other Support Services
Usually Single-Bid155%
64,43285% of 75,829
561Subsector
Fewer Bidders248%
847,72079% of 1,066,351
56Sector
Administrative and Support and Waste Management and Remediation Services
Fewer Bidders245%
1,121,39177% of 1,461,546

Bidder counts reported on past federal awards in this NAICS (USAspending). An open opportunity has no bidders yet, so this is the historical norm for similar work, not a fact about this solicitation. Not all awards report bidder counts, and fewer bidders often means incumbent-held work rather than an easier win. Federal reporting of bidder counts fell from ~96% of awards (FY2016) to ~30% (FY2018 onward); the chart shows shares of reported awards, and washed-out stretches mark years with fewer than 30 of them.

Related NAICS Codes

Industries similar to All Other Support Services, by shared sector, subsector, and industry group.

Packaging and Labeling Services

This industry comprises establishments primarily engaged in packaging client-owned materials. The s...
561910Same Industry GroupHigh Similarity

Convention and Trade Show Organizers

This industry comprises establishments primarily engaged in organizing, promoting, and/or managing e...
561920Same Industry GroupHigh Similarity

Office Administrative Services

This industry comprises establishments primarily engaged in providing a range of day-to-day office a...
561110Same SubsectorMedium Similarity

Facilities Support Services

This industry comprises establishments primarily engaged in providing operating staff to perform a c...
561210Same SubsectorMedium Similarity

Employment Placement Agencies

This U.S. industry comprises establishments primarily engaged in listing employment vacancies and in...
561311Same SubsectorMedium Similarity

Executive Search Services

This U.S. industry comprises establishments primarily engaged in providing executive search, recruit...
561312Same SubsectorMedium Similarity

Temporary Help Services

This industry comprises establishments primarily engaged in supplying workers to clients' businesses...
561320Same SubsectorMedium Similarity

Professional Employer Organizations

This industry comprises establishments primarily engaged in providing human resources and human reso...
561330Same SubsectorMedium Similarity

Explore contracts across multiple NAICS codes Browse all NAICS Codes

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NAICS 561990 FAQ

Frequently Asked Questions

NAICS code 561990 covers All Other Support Services. This industry comprises establishments primarily engaged in providing day-to-day business and other organizational support services (except office administrative services, facilities support services, employment services, business support services, travel arrangement and reservation services, security and investigation services, services to buildings and other structures, packaging and labeling services, and convention and trade show organizing services). Illustrative Examples: Bartering services Flagging (i.e., traffic control) services Bottle exchanges Float decorating services Inventory taking services Contract meter reading services Lumber grading services Diving services on a contract or fee basis Cross-References. Establishments primarily engaged in--

Recently Posted in All Other Support Services

NAICS: 561990
New
SLED
Traffic Control ServicesThis subcontract for Traffic Control Services supports prime contractors on State Corpus Christi District highway projects specifically located on US 59. The scope of work involves the installation of Temporary Traffic Control devices, the management of lane closures, and the provision of professional flagging services. To ensure a safe and managed traffic flow throughout the construction period, the contractor will utilize equipment such as traffic cones, barrels, arrow boards, and various signage. The project is categorized under NAICS code 561990 and is associated with the Texas agency within the Corpus Christi District. Interested parties can find further details through the Texas Department of Transportation business opportunities portal.
Corpus Christi District

POSTED

in 5 months

DEADLINE

N/A
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NAICS: 561990
New
SLED
Temporary Pavement Marking and Traffic ControlThis subcontract for the West Virginia Department of Transportation involves the supply and installation of temporary traffic control devices and pavement markings for prime contractors. The scope of work includes the application of 6-inch temporary pavement marking paint and the deployment of traffic control devices to ensure full compliance with WVDOT traffic control standards. The project focuses on delivering marked lanes and active traffic control for a 1.62-mile work zone located in Barbour. This contract is categorized under NAICS code 561990 and is scheduled for a response deadline of November 17, 2026.
West Virginia Department of Transportation

POSTED

in about 1 month

DEADLINE

in about 1 month
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NAICS: 561990
New
SLED
Traffic Control and Flagger ServicesThis subcontract for Traffic Control and Flagger Services supports prime contractors on WVDOT projects in Marshall. The scope of work involves providing certified flaggers and safety personnel to ensure safe traffic flow and managed work zones. Responsibilities include the deployment of traffic control devices such as cones, barrels, and signage, as well as the operation of Changeable Message Signs. All services must strictly adhere to WVDOT Traffic Control standards to maintain safety and compliance. The contract is categorized under NAICS code 561990 and is associated with the West Virginia Department of Transportation.
WVDOT

POSTED

in about 1 month

DEADLINE

in about 1 month
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NAICS: 561990
New
SLED
Traffic Control & Pavement MarkingThis subcontract focuses on providing essential traffic control and pavement marking services for prime contractors operating on West Virginia Department of Transportation projects. The scope of work includes the deployment of pilot trucks, flaggers, and various traffic control devices to ensure safe traffic flow, as well as the application of both temporary and permanent edge lines and centerlines using specialized striping trucks. The project is categorized under NAICS code 561990 and is specifically designated for performance in Hardy, West Virginia. All services must be delivered in compliance with state transportation standards to ensure road safety and regulatory adherence.
West Virginia Department of Transportation

POSTED

in about 1 month

DEADLINE

in about 1 month
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NAICS: 561990
New
SLED
Traffic Control and Pilot Car ServicesThis subcontract for Traffic Control and Pilot Car Services is issued by the West Virginia Department of Transportation to support prime contractors on Division of Highways projects located in Fayette County. The scope of work focuses on maintaining road safety and ensuring efficient site access and traffic flow through the deployment of pilot trucks with qualified drivers and Changeable Message Signs. The project falls under NAICS code 561990 and is scheduled for a response deadline of November 17, 2026. The primary objective is to provide comprehensive traffic management services to ensure the safety of both workers and the public during highway construction activities.
West Virginia Department of Transportation

POSTED

in about 1 month

DEADLINE

in about 1 month
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NAICS: 561990
New
SLED
Traffic Control and FlaggingThis subcontract for the Arkansas Department of Transportation involves providing comprehensive traffic control and flagging services for prime contractors on highway projects. The scope of work includes the implementation of traffic control plans and the provision of specialized flagging services specifically for Union Pacific Railroad property to ensure safe traffic flow and site access. The project is located in Crawford, Arkansas, and falls under NAICS code 561990. The contract was posted on November 4, 2026, with a corresponding response deadline on the same date.
Arkansas Department of Transportation

POSTED

in 19 days

DEADLINE

in 19 days
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NAICS: 561990
New
SLED
Maintenance of Traffic (MOT) & Traffic ControlThis subcontract for Maintenance of Traffic and Traffic Control supports prime contractors on Maryland Department of Transportation State Highway Administration roadway projects in Anne Arundel. The scope of work involves providing essential traffic control devices and personnel to implement Traffic Control Plans and deploy Automated Flagger Assistance Devices. All operations must adhere to MUTCD standards, utilizing MASH compliant signage, barriers, and high-visibility safety apparel to ensure a safe and compliant work zone with managed traffic flow. A critical requirement for this engagement is the Traffic Control Plan Certification. The project falls under NAICS code 561990 and is managed by the Maryland Department of Transportation. Interested parties should note the response deadline of October 29, 2026.
Maryland Department of Transportation

POSTED

in 13 days

DEADLINE

in 13 days
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NAICS: 561990
New
SLED
Maintenance of Traffic (MOT) & Traffic Control ServicesThis subcontract for Maintenance of Traffic and Traffic Control Services supports prime contractors on Maryland Department of Transportation State Highway Administration bridge preservation projects. The scope of work involves the implementation of Traffic Control Plans and the installation of temporary traffic signs, drums, and cones utilizing arrow panels and Protection Vehicles to ensure a safe, managed traffic zone that complies with SHA standards. The contract is categorized under NAICS code 561990 and is designated for performance across an area-wide location. It is managed by the Maryland Department of Transportation with a response deadline of October 29, 2026.
Maryland Department of Transportation

POSTED

in 13 days

DEADLINE

in 13 days
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NAICS: 561990
New
SLED
Traffic Control and ManagementThis subcontract for Traffic Control and Management involves the installation and management of traffic control devices for prime contractors on Maryland Department of Transportation State Highway Administration bridge projects. The scope of work focuses on the implementation of Traffic Control Plans per Section 104.01 across multiple bridge sites in Montgomery, including the deployment of Static Automated Speed Enforcement equipment, signage, barriers, and traffic cones to ensure safe traffic flow. The project is categorized under NAICS code 561990 and is managed by the Maryland Department of Transportation. The contractor is responsible for providing certified plan implementation and utilizing high-visibility apparel to maintain safety standards throughout the duration of the bridge projects.
Maryland Department of Transportation

POSTED

in 13 days

DEADLINE

in 13 days
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NAICS: 561990
New
SLED
Traffic Control SpecialistThis subcontract for a Traffic Control Specialist involves the implementation and maintenance of traffic control plans for prime contractors working on Virginia Department of Transportation road and bridge projects. The primary objective is to ensure a safe and managed traffic environment through the installation of temporary construction signs, cones, barricades, and arrow boards. All operations must strictly adhere to the Virginia Work Area Protection Manual v11.0, Virginia MUTCD v11.0, and VDOT Section 512. The project is located in Henrico, Virginia, and falls under NAICS code 561990. The contract is managed by the Virginia Department of Transportation and is scheduled for a response deadline of October 28, 2026.
VDOT

POSTED

in 12 days

DEADLINE

in 12 days
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NAICS: 561990
New
SLED
Traffic Control and Safety Closure ServicesThis subcontract for Traffic Control and Safety Closure Services supports prime contractors on Iowa Department of Transportation bridge approach projects located in Warren County. The scope of work involves managing work zone safety through the deployment and maintenance of traffic cones, signage, and barricades to ensure compliant traffic diversion throughout the project duration. All operations must strictly adhere to Section 2528 of the IDOT Standard Specifications to maintain a safe environment for workers and the public. The contract falls under NAICS code 561990 and is associated with the Iowa Department of Transportation.
Iowa Department of Transportation

POSTED

in 4 days

DEADLINE

in 4 days
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NAICS: 561990
New
SLED
Traffic Control ProviderThe Traffic Control Provider subcontract involves providing comprehensive traffic management and control services for prime contractors working on West Virginia Department of Transportation roadway and scale projects. The scope of work includes the implementation of safety measures such as the deployment of cones, signage, barriers, and flaggers to ensure safe traffic flow and effective site perimeter management in strict accordance with state and federal safety regulations. This opportunity is categorized under NAICS code 561990 and is specifically designated for performance in Preston. The contract is managed by the West Virginia Department of Transportation, with a response deadline set for October 20, 2026.
West Virginia Department of Transportation

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