NAICS 561621: Security Systems Services (except Locksmiths)
This U.S. industry comprises establishments primarily engaged in (1) selling security alarm systems, such as burglar and fire alarms, along with installation, repair, or monitoring services or (2) remote monitoring of electronic security alarm systems. Cross-References. Establishments primarily engaged in--Show more
NAICS 561621 – Security Systems Services (except Locksmiths) encompasses the installation, integration, maintenance, and monitoring of electronic security systems designed to protect physical assets, personnel, and sensitive infrastructure. This includes intrusion detection systems, access control platforms, video surveillance networks, alarm monitoring centers, and integrated security management software.
Industry Spending Overview
Federal obligations, top contractors and agencies, and related industry codes for NAICS 561621.
AI Industry Description
NAICS 561621 – Security Systems Services (except Locksmiths) encompasses the installation, integration, maintenance, and monitoring of electronic security systems designed to protect physical assets, personnel, and sensitive infrastructure. This includes intrusion detection systems, access control p...
NAICS 561621 – Security Systems Services (except Locksmiths) encompasses the installation, integration, maintenance, and monitoring of electronic security systems designed to protect physical assets, personnel, and sensitive infrastructure. This includes intrusion detection systems, access control platforms, video surveillance networks, alarm monitoring centers, and integrated security management software. These services are critical for securing federal facilities, data centers, border infrastructure, and mission-critical operations, often requiring compliance with FISMA, NIST, and DHS cybersecurity standards. The sector bridges physical security and cybersecurity domains, with contractors delivering end-to-end solutions that combine hardware, firmware, and cloud-based analytics to enable real-time threat response and audit-ready reporting. Top contractors in this space include INTER-PACIFIC INC., ACTIVE SECURITY CONSULTING LLC, PVPII - FNSS ACQUISITION, INC., and UNIVERSAL ELECTRONIC ALARMS, INC., among others. The competitive landscape is dominated by small businesses and mid-tier primes with specialized expertise in federal compliance, system integration, and rapid deployment of secure infrastructure. Many firms hold 8(a), HUBZone, or SDVOSB certifications, reflecting a strong presence of disadvantaged and veteran-owned businesses in this niche. Primary federal buyers include the Department of Defense, Department of Homeland Security, Department of Veterans Affairs, and Department of Justice, with additional demand from the Department of the Interior, General Services Administration, and Department of State. These agencies procure security systems to safeguard military installations, border patrol operations, VA medical campuses, and diplomatic facilities, often as part of broader infrastructure modernization and physical security upgrade initiatives. The market is highly fragmented yet opportunity-dense, with recurring maintenance contracts and system upgrades driving steady demand. Contractors with proven experience in federal procurement compliance, system interoperability, and cybersecurity integration are best positioned to compete. Emerging trends include the adoption of AI-enabled video analytics, cloud-connected alarm platforms, and zero-trust access control architectures, creating new avenues for innovation and contract growth.
Small Business Size Standard
The SBA threshold that decides who can bid NAICS 561621 work as a small business.
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 561621, ranked by dollars won.
| Company | Total Awards | Contracts |
|---|---|---|
| M. C. DEAN, INC. | $102.8M | 66 |
| SERCO INC | $101.7M | 4 |
| FIRST COAST SECURITY SOLUTIONS, INC. | $59.2M | 2 |
| PARAGON SYSTEMS INC | $57.7M | 2 |
| AKAMAI INTELLIGENCE LLC | $47.2M | 1 |
| TROFHOLZ TECHNOLOGIES, INC. | $29.8M | 6 |
| TRIPLE CANOPY, INC. | $26.2M | 4 |
| JOHNSON CONTROLS SECURITY SOLUTIONS LLC | $14.9M | 67 |
| SCDATACOM, LLC | $12.6M | 18 |
| JOHNSON CONTROLS BUILDING AUTOMATION SYSTEMS, LLC | $9.8M | 39 |
Top Agencies
Federal agencies directing the most contract spending toward NAICS 561621.
Competition
How many companies historically bid on federal awards in NAICS 561621, from bidder counts reported on USAspending.
Half or more of reported awards drew exactly one bidder, usually a sign of incumbent-held work rather than an open field. · 61,633 reported awards
Median Bidders
1
Per reported award, all-time
Single-Bid Awards
59%
Share of reported awards with one bidder
10+ Bidder Awards
1%
Share of reported awards with 10+ bidders
Reported Awards
61,633
86% of 71,643 total awards
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 Family | Competition | Median Bidders | Single-Bid | Bidder Mix | Reported Awards |
|---|---|---|---|---|---|
561621This Code Security Systems Services (except Locksmiths) | Usually Single-Bid | 1 | 59% | 61,63386% of 71,643 | |
56162NAICS Industry | Usually Single-Bid | 1 | 59% | 65,29886% of 76,125 | |
5616Industry Group Investigation and Security Services | Usually Single-Bid | 1 | 56% | 145,57981% of 179,476 | |
561Subsector | Fewer Bidders | 2 | 48% | 847,72079% of 1,066,351 | |
56Sector Administrative and Support and Waste Management and Remediation Services | Fewer Bidders | 2 | 45% | 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 Security Systems Services (except Locksmiths), by shared sector, subsector, and industry group.
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