Top 100 Contractors in NAICS 56161: Investigation, Guard, and Armored Car Services, FY2025

Name: Top 100 Contractors in NAICS 56161: Investigation, Guard, and Armored Car Services, FY2025
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 48% of FY2025 NAICS 56161 contract dollars

Contract obligations: $6,857,433,235 Net of deobligations, by contracts coded NAICS 56161 or a code under it
Contractors: 809 Parent companies with an obligation
Largest contractor: Securitas Critical Infrastructure Services Inc. $542 million, 7.4% of obligations
Data as of: Oct 23, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Securitas Critical Infrastructure Services Inc. Through Paragon Systems Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$541,859,046	7.4%	Rank history: not on the FY2021–FY2023 lists and #3 in FY2024; up 2 since FY2024.
2	Metropolitan Security Services, Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice) GSA (General Services Administration)	$527,525,607	7.2%	Rank history: #5 in FY2021, #5 in FY2022, #4 in FY2023 and #1 in FY2024; down 1 since FY2024.
3	Constellis, LLC 4 awardees, including Triple Canopy Inc., Centerra Group, LLC and Omniplex World Services Corporation Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOS (Department of State)	$478,886,830	6.6%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2024; up 87 since FY2024.
4	The GEO Group, Inc. 2 awardees, including GEO Transport, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$347,668,166	4.8%	Rank history: #9 in FY2021, #4 in FY2022, #5 in FY2023 and #5 in FY2024; up 1 since FY2024.
5	Corecivic, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$315,397,445	4.3%	Rank history: #11 in FY2021, #7 in FY2022, #9 in FY2023 and #9 in FY2024; up 4 since FY2024.
6	Peraton Risk Decision Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$293,181,902	4.0%	Rank history: not on the FY2021–FY2023 lists and #14 in FY2024; up 8 since FY2024.
7	Nana Regional Corporation, Inc. 4 awardees, including Akima Infrastructure Protection LLC, Akima Global Services, LLC and Akima Centerra Integrated Services LLC Top agencies DHS (Department of Homeland Security) AOUSC (Administrative Office of the U.S. Courts)	$292,582,366	4.0%	Rank history: #14 in FY2021, #14 in FY2022, #16 in FY2023 and #26 in FY2024; up 19 since FY2024.
8	CACI International Inc. Through Caci, Inc. - Federal Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$259,084,876	3.6%	Rank history: #3 in FY2021, #12 in FY2022, #8 in FY2023 and #7 in FY2024; down 1 since FY2024.
9	The Chenega Corporation 10 awardees, including Chenega Global Protection, LLC, Chenega Naswik International LLC and Chenega Infinity, LLC Top agencies NASA (National Aeronautics and Space Administration) HHS (Department of Health and Human Services) Army (Department of the Army)	$220,683,151	3.0%	Rank history: #36 in FY2021, #26 in FY2022, #14 in FY2023 and #39 in FY2024; up 30 since FY2024.
10	BC Partners LLP 4 awardees, including Gardaworld Federal Services LLC, Aegis-Kk Security and Gardaworld North America Top agencies DOS (Department of State) Army (Department of the Army) Navy (Department of the Navy)	$185,679,897	2.5%	Rank history: not on the FY2021 list, #45 in FY2022, #15 in FY2023 and #10 in FY2024; unchanged since FY2024.
11	Inter-CON Security Systems Inc. Top agencies DOS (Department of State) DOJ (Department of Justice) GAO (Government Accountability Office)	$184,085,997	2.5%	Rank history: #7 in FY2021, #9 in FY2022, #11 in FY2023 and #11 in FY2024; unchanged since FY2024.
12	Mvm, Inc. Top agencies DHS (Department of Homeland Security)	$172,732,300	2.4%	Rank history: #12 in FY2021, #3 in FY2022, #6 in FY2023 and #8 in FY2024; down 4 since FY2024.
13	Bering Straits Native Corporation 3 awardees, including Paragon Professional Services LLC, Bering Straits Professional Services, LLC and Bering Global Solutions, LLC Top agencies DHS (Department of Homeland Security) DOT (Department of Transportation) DOS (Department of State)	$160,493,162	2.2%	Rank history: #45 in FY2021, #42 in FY2022, #44 in FY2023 and #98 in FY2024; up 85 since FY2024.
14	Pond Security Service GMBH Top agencies Army (Department of the Army) DOS (Department of State) DECA (Defense Commissary Agency)	$128,652,490	1.8%	Rank history: #13 in FY2021, #11 in FY2022, #13 in FY2023 and #15 in FY2024; up 1 since FY2024.
15	Universal Protection Service, Limited Partnership 2 awardees, including Universal Protection Service, LLC Top agencies DHS (Department of Homeland Security) Smithsonian (Smithsonian Institution) DOI (Department of the Interior)	$125,568,331	1.7%	Rank history: not on the FY2021–FY2023 lists and #30 in FY2024; up 15 since FY2024.
16	Kerberos International Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$122,000,938	1.7%	Rank history: not on the FY2021–FY2022 lists, #23 in FY2023 and #16 in FY2024; unchanged since FY2024.
17	Covenant Aviation Security, LLC Top agencies DHS (Department of Homeland Security)	$111,625,246	1.5%	Rank history: not on the FY2021–FY2024 lists; new.
18	Bradley Technologies Inc. Top agencies DHS (Department of Homeland Security) CSOSA (Court Services and Offender Supervision Agency) Army (Department of the Army)	$89,516,529	1.2%	Rank history: #93 in FY2021, #84 in FY2022, #33 in FY2023 and #23 in FY2024; up 5 since FY2024.
19	G4S Secure Solutions (USA) Inc. Top agencies DHS (Department of Homeland Security)	$89,344,003	1.2%	Rank history: not on the FY2021–FY2023 lists and #31 in FY2024; up 12 since FY2024.
20	CDA Incorporated Top agencies DHS (Department of Homeland Security)	$89,124,916	1.2%	Rank history: #25 in FY2021, #28 in FY2022, #38 in FY2023 and #24 in FY2024; up 4 since FY2024.
21	Vendtech-Sgi LLC Top agencies DHS (Department of Homeland Security)	$77,256,082	1.1%	Rank history: #18 in FY2021, #19 in FY2022, #21 in FY2023 and #21 in FY2024; unchanged since FY2024.
22	Continuity Global Solutions LLC 7 awardees, including I3 Pathfinder USA LLC, Torres-Avarn Security LLC and Cgs-Orsa Security LLC Top agencies DOS (Department of State) Army (Department of the Army) Navy (Department of the Navy)	$62,671,201	0.9%	Rank history: #55 in FY2021, #52 in FY2022, #43 in FY2023 and #58 in FY2024; up 36 since FY2024.
23	Diversified Protection Corp 2 awardees, including Fiore Industries Inc. Top agencies DHS (Department of Homeland Security) DOL (Department of Labor) EPA (Environmental Protection Agency)	$56,591,482	0.8%	Rank history: #19 in FY2021, #18 in FY2022, #22 in FY2023 and #34 in FY2024; up 11 since FY2024.
24	Covenant Services Worldwide LLC Through Covenant Aviation Security, LLC Top agencies DHS (Department of Homeland Security)	$53,711,139	0.7%	Rank history: #15 in FY2021, #13 in FY2022, #12 in FY2023 and #12 in FY2024; down 12 since FY2024.
25	Nve, Inc. Top agencies DOS (Department of State) Army (Department of the Army)	$51,974,488	0.7%	Rank history: #42 in FY2021, #27 in FY2022, #36 in FY2023 and not on the FY2024 list; up 77 since FY2024.
26	Simmons & Golden Security LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy)	$51,567,184	0.7%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2024; up 36 since FY2024.
27	Management & Training Corporation Top agencies DHS (Department of Homeland Security)	$50,621,250	0.7%	Rank history: #32 in FY2021, #31 in FY2022, #28 in FY2023 and #32 in FY2024; up 5 since FY2024.
28	Trailboss Enterprises, Inc. Top agencies DHS (Department of Homeland Security)	$48,527,727	0.7%	Rank history: #88 in FY2021, not on the FY2022–FY2023 lists and #36 in FY2024; up 8 since FY2024.
29	G4S Secure Integration LLC Top agencies DOS (Department of State)	$47,416,729	0.7%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023 and #25 in FY2024; down 4 since FY2024.
30	The Whitestone Group, Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior) DHS (Department of Homeland Security)	$42,997,200	0.6%	Rank history: not on the FY2021 list, #51 in FY2022, #60 in FY2023 and #52 in FY2024; up 22 since FY2024.
31	Hana Industries, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) DOT (Department of Transportation)	$41,259,221	0.6%	Rank history: #33 in FY2021, #34 in FY2022, #34 in FY2023 and #41 in FY2024; up 10 since FY2024.
32	Kr-Mtac LLC Top agencies DHS (Department of Homeland Security)	$39,720,088	0.5%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023 and #37 in FY2024; up 5 since FY2024.
33	VMD Systems Integrators LLC Top agencies DHS (Department of Homeland Security)	$39,703,797	0.5%	Rank history: not on the FY2021–FY2022 lists, #35 in FY2023 and #38 in FY2024; up 5 since FY2024.
34	Golden Svcs, LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy)	$36,522,135	0.5%	Rank history: #17 in FY2021, #15 in FY2022, #29 in FY2023 and #40 in FY2024; up 6 since FY2024.
35	Madison Associates Inc. Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services) DODIG (Department of Defense Inspector General)	$34,575,871	0.5%	Rank history: #71 in FY2021, #64 in FY2022, #55 in FY2023 and #55 in FY2024; up 20 since FY2024.
36	Acuity International LLC 2 awardees, including Acuity - Janus Global, LLC Top agencies DOS (Department of State) WHS (DOD Washington Headquarters Service) DHS (Department of Homeland Security)	$33,373,300	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
37	North American Security, Incorporated Top agencies DHS (Department of Homeland Security)	$31,467,789	0.4%	Rank history: #28 in FY2021, #32 in FY2022, #32 in FY2023 and #35 in FY2024; down 2 since FY2024.
38	Professional Risk Management, Inc. Top agencies DOJ (Department of Justice)	$28,148,039	0.4%	Rank history: #72 in FY2021, #67 in FY2022, #56 in FY2023 and #42 in FY2024; up 4 since FY2024.
39	G4S France JV Top agencies DOS (Department of State)	$26,050,075	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
40	ISS Action Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) CFPB (Consumer Financial Protection Bureau)	$25,025,186	0.3%	Rank history: #26 in FY2021, #22 in FY2022, #20 in FY2023 and #27 in FY2024; down 13 since FY2024.
41	Protection Strategies Inc. Top agencies HHS (Department of Health and Human Services) DOE (Department of Energy) DHS (Department of Homeland Security)	$24,639,711	0.3%	Rank history: #38 in FY2021, #21 in FY2022, #31 in FY2023 and #45 in FY2024; up 4 since FY2024.
42	Vision Quest Solutions Inc. Top agencies USDA (Department of Agriculture) Army (Department of the Army) DOE (Department of Energy)	$24,188,840	0.3%	Rank history: not on the FY2021–FY2024 lists; up 104 since FY2024.
43	Patronus Systems Inc Top agencies DHS (Department of Homeland Security)	$23,341,843	0.3%	Rank history: not on the FY2021–FY2022 lists, #53 in FY2023 and #44 in FY2024; up 1 since FY2024.
44	Ids International, LLC 2 awardees, including Ids International Government Services LLC Top agencies DOS (Department of State) NARA (National Archives and Records Administration)	$23,016,920	0.3%	Rank history: #48 in FY2021, not on the FY2022–FY2023 lists and #51 in FY2024; up 7 since FY2024.
45	Spectrum Security Services, Inc. Top agencies DHS (Department of Homeland Security)	$22,384,449	0.3%	Rank history: #50 in FY2021, #47 in FY2022, #49 in FY2023 and #60 in FY2024; up 15 since FY2024.
46	Aviation Security Management LLC Top agencies DHS (Department of Homeland Security)	$21,374,638	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
47	Arctic Slope Regional Corporation Through Asrc Federal Professional Services, LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$21,104,030	0.3%	Rank history: not on the FY2021–FY2022 lists, #41 in FY2023 and #22 in FY2024; down 25 since FY2024.
48	Olgoonik Corporation 2 awardees, including Olgoonik Innovations, LLC and Olgoonik Solutions LLC Top agencies DOS (Department of State) HHS (Department of Health and Human Services)	$21,016,653	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
49	Security 1 Solutions LLC 2 awardees, including S1S Alpha LLC Top agencies DOD (Department of Defense) Navy (Department of the Navy)	$20,565,204	0.3%	Rank history: not on the FY2021–FY2024 lists; up 186 since FY2024.
50	Equifax Inc. Through Equifax Workforce Solutions LLC Top agencies SSA (Social Security Administration) DCSA (Defense Counterintelligence and Security Agency) DOS (Department of State)	$20,132,696	0.3%	Rank history: #97 in FY2021, #97 in FY2022, #81 in FY2023 and not on the FY2024 list; up 389 since FY2024.
51	Meritus Solutions Group LLC 2 awardees, including Pinnacle Protection Partners, LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$20,017,767	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
52	Culpepper & Associates Security Services Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) NARA (National Archives and Records Administration)	$18,433,696	0.3%	Rank history: #39 in FY2021, #46 in FY2022, #51 in FY2023 and #63 in FY2024; up 11 since FY2024.
53	Joeun System Corp. Top agencies Army (Department of the Army) DOS (Department of State)	$18,074,912	0.2%	Rank history: not on the FY2021 list, #56 in FY2022, #52 in FY2023 and #65 in FY2024; up 12 since FY2024.
54	Afognak Native Corporation 2 awardees, including Shields Point LLC and Alutiiq Advanced Security Solutions LLC Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$17,653,740	0.2%	Rank history: #21 in FY2021, #40 in FY2022, #50 in FY2023 and #75 in FY2024; up 21 since FY2024.
55	United Security Inc. Top agencies DOJ (Department of Justice)	$17,471,516	0.2%	Rank history: #53 in FY2021, #66 in FY2022, #48 in FY2023 and #57 in FY2024; up 2 since FY2024.
56	Iworks Corp Top agencies DCSA (Defense Counterintelligence and Security Agency)	$16,879,210	0.2%	Rank history: #54 in FY2021, #62 in FY2022 and not on the FY2023–FY2024 lists; up 52 since FY2024.
57	SERVEXO Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DOT (Department of Transportation)	$16,412,121	0.2%	Rank history: not on the FY2021–FY2024 lists; up 87 since FY2024.
58	G4S India JV Top agencies DOS (Department of State)	$16,052,259	0.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2024; up 13 since FY2024.
59	Ahtna, Incorporated Through Ahtna Professional Services, Inc. Top agencies DHS (Department of Homeland Security)	$16,034,850	0.2%	Rank history: #35 in FY2021, #30 in FY2022, #64 in FY2023 and not on the FY2024 list; returned.
60	The Cogar Group. Ltd. Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DHS (Department of Homeland Security)	$16,001,178	0.2%	Rank history: #66 in FY2021, #63 in FY2022, #58 in FY2023 and #77 in FY2024; up 17 since FY2024.
61	American Eagle Protective Services Corp Top agencies DHS (Department of Homeland Security) DOL (Department of Labor) DOJ (Department of Justice)	$15,538,907	0.2%	Rank history: not on the FY2021–FY2023 lists and #79 in FY2024; up 18 since FY2024.
62	Koniag, Inc. 3 awardees, including Koniag Professional Services, LLC, Pacarctic, LLC and Kadiak LLC Top agencies DARPA (Defense Advanced Research Projects Agency) DOJ (Department of Justice) Army (Department of the Army)	$15,442,772	0.2%	Rank history: not on the FY2021–FY2024 lists; up 169 since FY2024.
63	Strategic Security Corp Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$15,116,259	0.2%	Rank history: not on the FY2021 list, #79 in FY2022, not on the FY2023 list and #89 in FY2024; up 26 since FY2024.
64	HBC Management Services, Inc. Top agencies SSA (Social Security Administration)	$15,076,325	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
65	Alante Security Group, Inc. Top agencies DHS (Department of Homeland Security)	$14,979,559	0.2%	Rank history: #58 in FY2021, #94 in FY2022, #61 in FY2023 and #68 in FY2024; up 3 since FY2024.
66	American Security Programs Inc. Top agencies NARA (National Archives and Records Administration) GAO (Government Accountability Office)	$14,763,173	0.2%	Rank history: not on the FY2021–FY2024 lists; up 54 since FY2024.
67	Johnson Security Bureau, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$14,401,145	0.2%	Rank history: not on the FY2021–FY2023 lists and #96 in FY2024; up 29 since FY2024.
68	Singularity Security Group LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$14,330,793	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #69 in FY2023 and #70 in FY2024; up 2 since FY2024.
69	Elliott Security Solutions LLC Top agencies DHS (Department of Homeland Security)	$13,902,000	0.2%	Rank history: not on the FY2021 list, #86 in FY2022, #79 in FY2023 and #92 in FY2024; up 23 since FY2024.
70	Prosecure, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$13,811,381	0.2%	Rank history: #70 in FY2021, #69 in FY2022, #70 in FY2023 and #83 in FY2024; up 13 since FY2024.
71	Excalibur Associates Inc. Top agencies Commerce (Department of Commerce) USDA (Department of Agriculture)	$13,545,176	0.2%	Rank history: #49 in FY2021, #44 in FY2022, #40 in FY2023 and #53 in FY2024; down 18 since FY2024.
72	Surveillance Security, Inc. Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$13,349,299	0.2%	Rank history: #77 in FY2021, #74 in FY2022, #67 in FY2023 and #59 in FY2024; down 13 since FY2024.
73	Defense Contracting Activity, LLC Top agencies USDA (Department of Agriculture) EPA (Environmental Protection Agency)	$12,926,750	0.2%	Rank history: #92 in FY2021, not on the FY2022–FY2023 lists and #94 in FY2024; up 21 since FY2024.
74	Defense Consulting Services LLC Top agencies DHS (Department of Homeland Security) DISA (Defense Information Systems Agency) DHA (Defense Health Agency)	$12,750,407	0.2%	Rank history: not on the FY2021 list, #88 in FY2022, #66 in FY2023 and #82 in FY2024; up 8 since FY2024.
75	Securemedy Inc. Top agencies National Gallery of Art Army (Department of the Army) HHS (Department of Health and Human Services)	$12,360,921	0.2%	Rank history: not on the FY2021–FY2024 lists; up 146 since FY2024.
76	Redcon Solutions Group LLC Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$11,989,969	0.2%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023 and #81 in FY2024; up 5 since FY2024.
77	Prudential Protective Services LLC Top agencies DOJ (Department of Justice) Commerce (Department of Commerce)	$11,772,828	0.2%	Rank history: not on the FY2021–FY2023 lists and #84 in FY2024; up 7 since FY2024.
78	VXL Enterprises LLC Top agencies DOS (Department of State)	$11,688,434	0.2%	Rank history: #74 in FY2021, #49 in FY2022, #62 in FY2023 and #85 in FY2024; up 7 since FY2024.
79	Protection Unit Top agencies Army (Department of the Army)	$11,511,014	0.2%	Rank history: not on the FY2021–FY2023 lists and #91 in FY2024; up 12 since FY2024.
80	Tatitlek Federal Services LLC Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$11,411,330	0.2%	Rank history: not on the FY2021–FY2023 lists and #88 in FY2024; up 8 since FY2024.
81	Hana Technologies & Systems, Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$11,295,221	0.2%	Rank history: not on the FY2021–FY2024 lists; up 28 since FY2024.
82	KR Contracting Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$11,099,902	0.2%	Rank history: #34 in FY2021, #35 in FY2022, #47 in FY2023 and #66 in FY2024; down 16 since FY2024.
83	Information Systems & Networks Corporation Top agencies DOJ (Department of Justice)	$10,717,845	0.1%	Rank history: not on the FY2021–FY2024 lists; up 87 since FY2024.
84	Sicuritalia - Securitas Critical Infrastructure Services Inc JV Top agencies DOS (Department of State)	$10,594,637	0.1%	Rank history: #80 in FY2021, #78 in FY2022, #83 in FY2023 and #87 in FY2024; up 3 since FY2024.
85	Coventbridge (USA) LLC Top agencies USDA (Department of Agriculture)	$10,307,013	0.1%	Rank history: not on the FY2021–FY2023 lists and #95 in FY2024; up 10 since FY2024.
86	Trinity Technology Group, Inc. Top agencies DHS (Department of Homeland Security)	$10,158,236	0.1%	Rank history: #52 in FY2021, #58 in FY2022, #65 in FY2023 and #64 in FY2024; down 22 since FY2024.
87	Amentum Holdings, Inc. Through Amentum Services, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) OSD (Office of the Secretary of Defense)	$10,044,428	0.1%	Rank history: not on the FY2021–FY2024 lists; up 85 since FY2024.
88	Five Stones Intelligence Inc. Top agencies DOJ (Department of Justice)	$9,926,985	0.1%	Rank history: not on the FY2021–FY2024 lists; up 50 since FY2024.
89	Master Security Company LLC Top agencies DHS (Department of Homeland Security)	$9,894,515	0.1%	Rank history: #40 in FY2021, #41 in FY2022, #39 in FY2023 and #50 in FY2024; down 39 since FY2024.
90	Civis Holding SPA Through C.i.v.i.s. Centro Italiano DI Vigilanza Interna E Stradale S.P.A. Top agencies Army (Department of the Army)	$9,815,969	0.1%	Rank history: not on the FY2021–FY2024 lists; up 17 since FY2024.
91	First Coast Security Solutions Inc. Top agencies DHS (Department of Homeland Security)	$9,790,925	0.1%	Rank history: not on the FY2021–FY2024 lists; up 287 since FY2024.
92	Global Security Management Agency, Inc. Top agencies Navy (Department of the Navy) DOJ (Department of Justice) DMEA (Defense Microelectronics Activity)	$9,148,978	0.1%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023 and not on the FY2024 list; up 19 since FY2024.
93	NV Securitas Securitas Critical Infrastructure Services Soc. Top agencies DOS (Department of State)	$8,880,137	0.1%	Rank history: #83 in FY2021, #95 in FY2022, #99 in FY2023 and not on the FY2024 list; up 11 since FY2024.
94	Capital Center for Credibility Assessment Corporation Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) USAF (Department of the Air Force)	$8,509,781	0.1%	Rank history: #68 in FY2021, #61 in FY2022, #97 in FY2023 and not on the FY2024 list; up 35 since FY2024.
95	Gardaworld-Transguard Group UAE 2 awardees, including Gardaworld Federal Nigeria Top agencies DOS (Department of State)	$8,070,585	0.1%	Rank history: not on the FY2021–FY2024 lists; up 64 since FY2024.
96	Trust Consulting Services Inc. Top agencies DOT (Department of Transportation) EPA (Environmental Protection Agency) FCC (Federal Communications Commission)	$7,925,394	0.1%	Rank history: not on the FY2021–FY2024 lists; up 93 since FY2024.
97	Deployed Resources LLC Top agencies DHS (Department of Homeland Security)	$7,466,830	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
98	G4S Guardsman JV Top agencies DOS (Department of State)	$7,275,074	0.1%	Rank history: not on the FY2021–FY2024 lists; up 14 since FY2024.
99	Anasec, Inc. Top agencies DHS (Department of Homeland Security)	$7,236,532	0.1%	Rank history: #98 in FY2021 and not on the FY2022–FY2024 lists; up 34 since FY2024.
100	The Ross Agency, Inc. Top agencies VA (Department of Veterans Affairs)	$7,108,459	0.1%	Rank history: not on the FY2021–FY2024 lists; up 16 since FY2024.

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100 of 809 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 56161

Code	Net obligations	Largest contractor
561612 Security Guards and Patrol Services	$5,996,277,933	Securitas Critical Infrastructure Services Inc.
561611 Investigation and Personal Background Check Services	$857,527,048	Peraton Risk Decision Inc.
561613 Armored Car Services	$3,628,255	Loomis Armored US LLC

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $7.28 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2025 ran Oct 1, 2024 – Sep 30, 2025. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2024. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2024 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 56161 contractors in FY2025?

1. Securitas Critical Infrastructure Services Inc. ($542M), 2. Metropolitan Security Services, Inc. ($528M), 3. Constellis, LLC ($479M), 4. The GEO Group, Inc. ($348M), 5. Corecivic, Inc. ($315M), 6. Peraton Risk Decision Inc. ($293M), 7. Nana Regional Corporation, Inc. ($293M), 8. CACI International Inc. ($259M), 9. The Chenega Corporation ($221M), 10. BC Partners LLP ($186M).

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