Security Systems Services (except Locksmiths) government contracts
74 open Security Systems Services (except Locksmiths) notices under NAICS 561621 right now. Federal buyers posted 482 since Aug 7, 2026.
Latest Security Systems Services (except Locksmiths) notices
Open notices first, soonest deadline first. Recently closed ones follow, so you can see what gets bought. Every row links to the official record.
Agencies buying Security Systems Services (except Locksmiths)
Who posted notices under NAICS 561621 since Aug 7, 2026, busiest first.
| Agency | Notices | Open now |
|---|---|---|
| Department of the Air Force Department of Defense | 126 | 11 |
| Department of the Army Department of Defense | 92 | 7 |
| Department of Veterans Affairs | 64 | 10 |
| U.S. Coast Guard Department of Homeland Security | 28 | 5 |
| National Park Service Department of the Interior | 22 | 6 |
| Forest Service Department of Agriculture | 18 | 1 |
| Department of the Navy Department of Defense | 17 | 5 |
| U.S. Fish and Wildlife Service Department of the Interior | 15 | 10 |
| Bureau of Land Management Department of the Interior | 14 | 5 |
| Drug Enforcement Administration Department of Justice | 13 | 3 |
| Agricultural Research Service Department of Agriculture | 8 | 0 |
| Indian Health Service Department of Health and Human Services | 8 | 0 |
| DHS Office of Procurement Operations Department of Homeland Security | 7 | 1 |
| Defense Health Agency Department of Defense | 6 | 1 |
| DOL Office of the Assistant Secretary for Administration and Management Department of Labor | 6 | 0 |
Every federal buyer is listed in the agency directory.
Who wins Security Systems Services (except Locksmiths) contracts
Contractors ranked by value obligated on NAICS 561621 awards.
| Contractor | Awards | Obligated |
|---|---|---|
| M. C. Dean, Inc. UEI RD55NEXJ5EW4 | 67 | $387M |
| Serco Inc UEI DKJ1R5ABCN48 | 11 | $306M |
| General Dynamics Mission Systems, Inc. UEI LKMMNBMPUNH7 | 4 | $246M |
| Johnson Controls Security Solutions LLC UEI YV2MG1WKYEQ3 | 61 | $181M |
| CACI International Inc UEI QSRTXLFKV857 | 5 | $167M |
| Triple Canopy Inc UEI F481BZWYCZA7 | 28 | $167M |
| Xator LLC UEI ZJFDNMA46LT9 | 14 | $154M |
| First Coast Security Solutions, Inc. UEI ZFWUMCPXHXU2 | 5 | $141M |
| Advanced Technology Systems Company, Inc. (Of Virginia) UEI J16ZWJLVHEY5 | 3 | $131M |
| Paragon Systems Inc UEI RG1VD6RNMXB5 | 8 | $103M |
From federal award records of $1M or more since October 2023. More in the contractor directory.
Stop checking this page by hand
Matched, not listed
Describe your company once. Captivaq scores every new notice against your capabilities, locations, and set-asides.
Earlier than the RFP
Forecasts and sources sought notices surface months before the solicitation, while you can still shape the win.
A draft, not a link
For the bids worth pursuing, it reads the solicitation and drafts the response with citations back to the source.
Questions people ask
What is NAICS 561621?
NAICS 561621 is the federal industry code for Security Systems Services (except Locksmiths). Agencies attach it to solicitations for this work, and it decides which small business size standard applies.
Are these real government contracts?
Yes. Every row comes from the public feed of the official source, most often SAM.gov, and links straight to the official notice. Confirm deadlines and amendments there before you respond.
Will this page list every open Security Systems Services (except Locksmiths) bid?
No single search can. Agencies sometimes file this work under a neighboring code or describe it differently. Use this page to find leads fast, then check scope, eligibility, and attachments in the official notice.
How often is this page updated?
The list refreshes through the day from the same opportunity database that powers Captivaq. It currently tracks 74 open notices.
How do I hear about new ones without checking back?
Captivaq watches the sources against your company profile and alerts you when a fitting notice posts, then scores the fit and drafts the response. That is the product behind this page.
Keep exploring
Landscaping services contracts
Grounds maintenance, mowing, tree care, and snow removal on public property.
NAICS 561210Facilities support services contracts
Full facility operation contracts that bundle cleaning, maintenance, and operations.
NAICS 561720Janitorial services contracts
Cleaning contracts for federal offices, clinics, visitor centers, and military installations.
NAICS 562111Waste collection contracts
Trash hauling and refuse collection for bases, parks, and public facilities.
NAICS 562910Environmental remediation contracts
Cleanup of contaminated soil, tanks, asbestos, and hazardous sites.
NAICS 561790Building maintenance services contracts
Pressure washing, chimney and gutter work, and specialty building upkeep.
More codes like this one are in administrative, support, and waste management services. Bidding in Canada? Tenders there classify work by UNSPSC rather than NAICS; start from Canadian government tenders.
Captivaq is an independent service from Logesta Labs LLC and is not affiliated with or endorsed by the U.S. government or SAM.gov. The notice on the official source portal is the record that governs; confirm deadlines and amendments there.