Top 100 Contractors in NAICS 56161: Investigation, Guard, and Armored Car Services, FY2024

Name: Top 100 Contractors in NAICS 56161: Investigation, Guard, and Armored Car Services, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 39% of FY2024 NAICS 56161 contract dollars

Contract obligations: $6,400,333,055 Net of deobligations, by contracts coded NAICS 56161 or a code under it
Contractors: 899 Parent companies with an obligation
Largest contractor: Metropolitan Security Services, Inc. $504 million, 7.5% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Metropolitan Security Services, Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice) GSA (General Services Administration)	$503,715,235	7.5%	Rank history: #5 in FY2021, #5 in FY2022, #4 in FY2023 and #2 in FY2025; up 3 since FY2023.
2	Omniplex World Services Corp 2 awardees, including Triple Canopy Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOS (Department of State)	$286,939,830	4.3%	Rank history: not on the FY2021–FY2022 lists, #3 in FY2023 and not on the FY2025 list; up 1 since FY2023.
3	Securitas Electronic Security Inc. Through Paragon Systems Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$277,623,677	4.1%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2025; new.
4	Securitas AB 4 awardees, including Paragon Systems Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$275,054,384	4.1%	Rank history: #1 in FY2021, #2 in FY2022, #1 in FY2023 and not on the FY2025 list; down 3 since FY2023.
5	The GEO Group, Inc. 2 awardees, including GEO Transport, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$254,275,770	3.8%	Rank history: #9 in FY2021, #4 in FY2022, #5 in FY2023 and #4 in FY2025; unchanged since FY2023.
6	Triple Canopy Inc. 2 awardees, including Centerra Group, LLC Top agencies DHS (Department of Homeland Security) DOS (Department of State) AOUSC (Administrative Office of the U.S. Courts)	$241,478,527	3.6%	Rank history: #2 in FY2021, #1 in FY2022, #2 in FY2023 and #3 in FY2025; down 4 since FY2023.
7	CACI International Inc. 3 awardees, including Caci, Inc. - Federal Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$216,347,431	3.2%	Rank history: #3 in FY2021, #12 in FY2022, #8 in FY2023 and #7 in FY2025; up 1 since FY2023.
8	Mvm, Inc. Top agencies DHS (Department of Homeland Security)	$214,389,050	3.2%	Rank history: #12 in FY2021, #3 in FY2022, #6 in FY2023 and #10 in FY2025; down 2 since FY2023.
9	Corecivic, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$187,072,135	2.8%	Rank history: #11 in FY2021, #7 in FY2022, #9 in FY2023 and #5 in FY2025; unchanged since FY2023.
10	BC Partners LLP Through Gardaworld Federal Services LLC Top agencies DOS (Department of State) Army (Department of the Army)	$183,686,060	2.7%	Rank history: not on the FY2021 list, #45 in FY2022, #15 in FY2023 and #9 in FY2025; up 5 since FY2023.
11	Inter-CON Security Systems Inc. 2 awardees Top agencies DOS (Department of State) DOJ (Department of Justice) DOI (Department of the Interior)	$167,861,626	2.5%	Rank history: #7 in FY2021, #9 in FY2022, #11 in FY2023 and #8 in FY2025; unchanged since FY2023.
12	Covenant Aviation Security LLC Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$156,021,127	2.3%	Rank history: #15 in FY2021, #13 in FY2022, #12 in FY2023 and #12 in FY2025; unchanged since FY2023.
13	Centerra Group, LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy) AOUSC (Administrative Office of the U.S. Courts)	$137,620,592	2.0%	Rank history: #31 in FY2021, not on the FY2022–FY2023 lists and #16 in FY2025; returned.
14	Peraton Risk Decision Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$131,093,431	1.9%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2025; new.
15	Pond Security Service GMBH Top agencies Army (Department of the Army) DOS (Department of State) DECA (Defense Commissary Agency)	$120,184,862	1.8%	Rank history: #13 in FY2021, #11 in FY2022, #13 in FY2023 and #14 in FY2025; down 2 since FY2023.
16	Kerberos International Inc. 2 awardees, including Acadia Protective Services II, LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$110,168,712	1.6%	Rank history: not on the FY2021–FY2022 lists, #23 in FY2023 and #15 in FY2025; up 7 since FY2023.
17	Chenega Global Protection, LLC Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army) HHS (Department of Health and Human Services)	$94,811,218	1.4%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2025; new.
18	HP Enterprise Services LLC Through Peraton Risk Decision Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency)	$94,629,315	1.4%	Rank history: #44 in FY2021, #10 in FY2022, #7 in FY2023 and not on the FY2025 list; down 11 since FY2023.
19	Akima Global Services, LLC Top agencies DHS (Department of Homeland Security)	$89,232,971	1.3%	Rank history: not on the FY2021 list, #36 in FY2022, #46 in FY2023 and #24 in FY2025; up 27 since FY2023.
20	Paragon Professional Services LLC Top agencies DHS (Department of Homeland Security) DOS (Department of State)	$83,141,869	1.2%	Rank history: not on the FY2021 list, #98 in FY2022, #19 in FY2023 and #18 in FY2025; down 1 since FY2023.
21	Vendtech-Sgi LLC Top agencies DHS (Department of Homeland Security)	$81,394,718	1.2%	Rank history: #18 in FY2021, #19 in FY2022, #21 in FY2023 and #22 in FY2025; unchanged since FY2023.
22	Arctic Slope Regional Corporation Through Asrc Federal Professional Services, LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$79,854,812	1.2%	Rank history: not on the FY2021–FY2022 lists, #41 in FY2023 and #51 in FY2025; up 19 since FY2023.
23	Bradley Technologies Inc. Top agencies DHS (Department of Homeland Security) JFK (John F. Kennedy Center for the Performing Arts) CSOSA (Court Services and Offender Supervision Agency)	$65,967,420	1.0%	Rank history: #93 in FY2021, #84 in FY2022, #33 in FY2023 and #19 in FY2025; up 10 since FY2023.
24	CDA Incorporated Top agencies DHS (Department of Homeland Security)	$55,029,165	0.8%	Rank history: #25 in FY2021, #28 in FY2022, #38 in FY2023 and #21 in FY2025; up 14 since FY2023.
25	G4S Secure Integration LLC Top agencies DOS (Department of State)	$52,058,101	0.8%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023 and #30 in FY2025; up 52 since FY2023.
26	Nana Regional Corporation Inc 2 awardees, including 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) DOJ (Department of Justice)	$50,072,726	0.7%	Rank history: #14 in FY2021, #14 in FY2022, #16 in FY2023 and #23 in FY2025; down 10 since FY2023.
27	ISS Action Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) CFPB (Consumer Financial Protection Bureau)	$49,920,736	0.7%	Rank history: #26 in FY2021, #22 in FY2022, #20 in FY2023 and #44 in FY2025; down 7 since FY2023.
28	Akima Infrastructure Protection LLC Top agencies DHS (Department of Homeland Security)	$49,661,470	0.7%	Rank history: not on the FY2021–FY2022 lists, #37 in FY2023 and #11 in FY2025; up 9 since FY2023.
29	Universal Protection GP, LLC 2 awardees, including Universal Protection Service, Limited Partnership and Universal Protection Service, LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) Smithsonian (Smithsonian Institution)	$48,180,394	0.7%	Rank history: #27 in FY2021, #24 in FY2022, #18 in FY2023 and not on the FY2025 list; down 11 since FY2023.
30	Universal Protection Service, Limited Partnership Top agencies DHS (Department of Homeland Security) Smithsonian (Smithsonian Institution) DOS (Department of State)	$48,119,776	0.7%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2025; new.
31	G4S Secure Solutions (USA) Inc. Top agencies DHS (Department of Homeland Security) DOE (Department of Energy)	$46,024,243	0.7%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2025; new.
32	Management & Training Corporation Top agencies DHS (Department of Homeland Security)	$44,473,943	0.7%	Rank history: #32 in FY2021, #31 in FY2022, #28 in FY2023 and #28 in FY2025; down 4 since FY2023.
33	G4S Holding One Inc. 6 awardees, including G4S Secure Integration LLC, G4S Secure Solutions (USA) Inc. and G4S (Rdc) Top agencies DOS (Department of State) DHS (Department of Homeland Security) DOE (Department of Energy)	$43,390,342	0.6%	Rank history: #8 in FY2021, #8 in FY2022, #10 in FY2023 and not on the FY2025 list; down 23 since FY2023.
34	Diversified Protection Corp Top agencies DHS (Department of Homeland Security) DOL (Department of Labor) EPA (Environmental Protection Agency)	$41,772,941	0.6%	Rank history: #19 in FY2021, #18 in FY2022, #22 in FY2023 and #27 in FY2025; down 12 since FY2023.
35	North American Security, Incorporated Top agencies DHS (Department of Homeland Security) Commerce (Department of Commerce)	$40,482,762	0.6%	Rank history: #28 in FY2021, #32 in FY2022, #32 in FY2023 and #41 in FY2025; down 3 since FY2023.
36	Trailboss Enterprises, Inc. Top agencies DHS (Department of Homeland Security)	$40,227,801	0.6%	Rank history: #88 in FY2021, not on the FY2022–FY2023 lists and #29 in FY2025; returned.
37	Kr-Mtac LLC Top agencies DHS (Department of Homeland Security)	$37,413,000	0.6%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023 and #33 in FY2025; up 17 since FY2023.
38	VMD Systems Integrators Inc Top agencies DHS (Department of Homeland Security)	$36,876,322	0.5%	Rank history: not on the FY2021–FY2022 lists, #35 in FY2023 and #34 in FY2025; down 3 since FY2023.
39	The Chenega Corporation 2 awardees, including Chenega Global Protection, LLC Top agencies NASA (National Aeronautics and Space Administration) HHS (Department of Health and Human Services) Army (Department of the Army)	$36,082,321	0.5%	Rank history: #36 in FY2021, #26 in FY2022, #14 in FY2023 and not on the FY2025 list; down 25 since FY2023.
40	Golden Svcs, LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy)	$34,043,995	0.5%	Rank history: #17 in FY2021, #15 in FY2022, #29 in FY2023 and #36 in FY2025; down 11 since FY2023.
41	Hana Industries, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) DOT (Department of Transportation)	$33,799,036	0.5%	Rank history: #33 in FY2021, #34 in FY2022, #34 in FY2023 and #32 in FY2025; down 7 since FY2023.
42	Professional Risk Management, Inc. Top agencies DOJ (Department of Justice)	$30,105,741	0.4%	Rank history: #72 in FY2021, #67 in FY2022, #56 in FY2023 and #42 in FY2025; up 14 since FY2023.
43	S1S Alpha LLC Top agencies DOD (Department of Defense)	$30,052,260	0.4%	Rank history: not on the FY2021 list, #59 in FY2022, #27 in FY2023 and #53 in FY2025; down 16 since FY2023.
44	Patronus Systems Inc Top agencies DHS (Department of Homeland Security)	$29,035,501	0.4%	Rank history: not on the FY2021–FY2022 lists, #53 in FY2023 and #47 in FY2025; up 9 since FY2023.
45	Protection Strategies Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) DOJ (Department of Justice)	$28,013,402	0.4%	Rank history: #38 in FY2021, #21 in FY2022, #31 in FY2023 and #45 in FY2025; down 14 since FY2023.
46	Chenega Naswik International LLC Top agencies MDA (DOD Missile Defense Agency) HHS (Department of Health and Human Services) Army (Department of the Army)	$27,694,672	0.4%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2025; up 113 since FY2023.
47	Acuity - Janus Global, LLC Top agencies DOS (Department of State)	$26,627,476	0.4%	Rank history: not on the FY2021–FY2023 lists and #40 in FY2025; new.
48	Chenega Infinity, LLC Top agencies DHS (Department of Homeland Security) MDA (DOD Missile Defense Agency)	$26,543,512	0.4%	Rank history: #24 in FY2021, #20 in FY2022, #24 in FY2023 and #76 in FY2025; down 24 since FY2023.
49	Equifax Workforce Solutions LLC Top agencies SSA (Social Security Administration) DCSA (Defense Counterintelligence and Security Agency) DOS (Department of State)	$24,941,160	0.4%	Rank history: not on the FY2021–FY2023 lists and #52 in FY2025; new.
50	Master Security Company LLC Top agencies DHS (Department of Homeland Security)	$24,658,896	0.4%	Rank history: #40 in FY2021, #41 in FY2022, #39 in FY2023 and #97 in FY2025; down 11 since FY2023.
51	Ids International, LLC 2 awardees, including Ids International Government Services LLC Top agencies Army (Department of the Army) DOS (Department of State) NARA (National Archives and Records Administration)	$24,042,315	0.4%	Rank history: #48 in FY2021, not on the FY2022–FY2023 lists and #48 in FY2025; returned.
52	The Whitestone Group, Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior) DOE (Department of Energy)	$23,941,693	0.4%	Rank history: not on the FY2021 list, #51 in FY2022, #60 in FY2023 and #31 in FY2025; up 8 since FY2023.
53	Excalibur Associates Inc. Top agencies USDA (Department of Agriculture) Commerce (Department of Commerce)	$23,380,746	0.3%	Rank history: #49 in FY2021, #44 in FY2022, #40 in FY2023 and #74 in FY2025; down 13 since FY2023.
54	Aviation Security Management LLC Top agencies DHS (Department of Homeland Security)	$22,874,417	0.3%	Rank history: #37 in FY2021, #29 in FY2022, #30 in FY2023 and #50 in FY2025; down 24 since FY2023.
55	Madison Associates Inc. Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services) DODIG (Department of Defense Inspector General)	$21,865,584	0.3%	Rank history: #71 in FY2021, #64 in FY2022, #55 in FY2023 and #38 in FY2025; unchanged since FY2023.
56	SOC LLC Top agencies DOS (Department of State)	$21,555,098	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
57	United Security Inc. Top agencies DOJ (Department of Justice)	$20,801,071	0.3%	Rank history: #53 in FY2021, #66 in FY2022, #48 in FY2023 and #58 in FY2025; down 9 since FY2023.
58	Torres Advanced Enterprise Solutions LLC 2 awardees, including Continuity Global Solutions LLC and Torres-Arkhe Group LLC Top agencies DOS (Department of State) Army (Department of the Army) Navy (Department of the Navy)	$19,912,138	0.3%	Rank history: #55 in FY2021, #52 in FY2022, #43 in FY2023 and #39 in FY2025; down 15 since FY2023.
59	Surveillance Security, Inc. Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$19,322,471	0.3%	Rank history: #77 in FY2021, #74 in FY2022, #67 in FY2023 and #75 in FY2025; up 8 since FY2023.
60	Spectrum Security Services, Inc. Top agencies DHS (Department of Homeland Security)	$17,979,225	0.3%	Rank history: #50 in FY2021, #47 in FY2022, #49 in FY2023 and #49 in FY2025; down 11 since FY2023.
61	EOD Technology Inc. Through Acuity - Janus Global, LLC Top agencies DOS (Department of State)	$17,805,860	0.3%	Rank history: #20 in FY2021, #17 in FY2022, #25 in FY2023 and not on the FY2025 list; down 36 since FY2023.
62	Simmons & Golden Security LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy)	$16,854,269	0.3%	Rank history: not on the FY2021–FY2023 lists and #26 in FY2025; up 48 since FY2023.
63	Culpepper & Associates Security Services Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) NARA (National Archives and Records Administration)	$16,794,849	0.2%	Rank history: #39 in FY2021, #46 in FY2022, #51 in FY2023 and #56 in FY2025; down 12 since FY2023.
64	Trinity Technology Group, Inc. Top agencies DHS (Department of Homeland Security)	$16,603,006	0.2%	Rank history: #52 in FY2021, #58 in FY2022, #65 in FY2023 and #94 in FY2025; up 1 since FY2023.
65	Joeun System Corp. Top agencies Army (Department of the Army)	$16,518,864	0.2%	Rank history: not on the FY2021 list, #56 in FY2022, #52 in FY2023 and #57 in FY2025; down 13 since FY2023.
66	KR Contracting Inc. Top agencies DHS (Department of Homeland Security) OSD (Office of the Secretary of Defense) Treasury (Department of the Treasury)	$16,504,828	0.2%	Rank history: #34 in FY2021, #35 in FY2022, #47 in FY2023 and #90 in FY2025; down 19 since FY2023.
67	Bering Straits Professional Services, LLC Top agencies DOT (Department of Transportation)	$16,462,236	0.2%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2025; new.
68	Alante Security Group, Inc. Top agencies DHS (Department of Homeland Security)	$16,252,258	0.2%	Rank history: #58 in FY2021, #94 in FY2022, #61 in FY2023 and #68 in FY2025; down 7 since FY2023.
69	I3 Pathfinder USA LLC Top agencies DOS (Department of State)	$16,163,299	0.2%	Rank history: #59 in FY2021, #60 in FY2022, #63 in FY2023 and #61 in FY2025; down 6 since FY2023.
70	Singularity Security Group LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$16,057,154	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #69 in FY2023 and #71 in FY2025; down 1 since FY2023.
71	G4S India JV Top agencies DOS (Department of State)	$15,502,524	0.2%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2025; up 51 since FY2023.
72	Athena Services International LLC Top agencies DHS (Department of Homeland Security)	$15,102,817	0.2%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2023 and not on the FY2025 list; up 18 since FY2023.
73	Chenega Security International, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$15,047,214	0.2%	Rank history: #67 in FY2021, #55 in FY2022, #71 in FY2023 and #80 in FY2025; down 2 since FY2023.
74	The Day & Zimmermann Group, Inc. Through SOC LLC Top agencies DOS (Department of State)	$14,800,875	0.2%	Rank history: #4 in FY2021, #6 in FY2022, #17 in FY2023 and not on the FY2025 list; down 57 since FY2023.
75	Afognak Native Corporation 2 awardees, including Shields Point LLC Top agencies DOJ (Department of Justice) USAF (Department of the Air Force) Army (Department of the Army)	$14,140,372	0.2%	Rank history: #21 in FY2021, #40 in FY2022, #50 in FY2023 and not on the FY2025 list; down 25 since FY2023.
76	G4S Evik JV Top agencies DOS (Department of State)	$14,120,000	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
77	The Cogar Group. Ltd. Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DHS (Department of Homeland Security)	$14,014,053	0.2%	Rank history: #66 in FY2021, #63 in FY2022, #58 in FY2023 and #64 in FY2025; down 19 since FY2023.
78	Ahtna Professional Services, Inc. Top agencies DHS (Department of Homeland Security)	$13,923,989	0.2%	Rank history: not on the FY2021 list, #75 in FY2022, #89 in FY2023 and #63 in FY2025; up 11 since FY2023.
79	American Eagle Protective Services Corp Top agencies DHS (Department of Homeland Security) DOL (Department of Labor) DOJ (Department of Justice)	$13,679,775	0.2%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2025; up 73 since FY2023.
80	Securamerica, LLC Through American Security Programs Inc. Top agencies GAO (Government Accountability Office) NARA (National Archives and Records Administration)	$13,214,529	0.2%	Rank history: #29 in FY2021, #90 in FY2022, #57 in FY2023 and not on the FY2025 list; down 23 since FY2023.
81	Redcon Solutions Group LLC Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$13,189,280	0.2%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023 and #83 in FY2025; down 36 since FY2023.
82	Defense Consulting Services LLC Top agencies DHS (Department of Homeland Security) DISA (Defense Information Systems Agency) USAF (Department of the Air Force)	$13,063,633	0.2%	Rank history: not on the FY2021 list, #88 in FY2022, #66 in FY2023 and #79 in FY2025; down 16 since FY2023.
83	Prosecure, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$12,987,847	0.2%	Rank history: #70 in FY2021, #69 in FY2022, #70 in FY2023 and #73 in FY2025; down 13 since FY2023.
84	Prudential Protective Services LLC Top agencies DOJ (Department of Justice) Commerce (Department of Commerce)	$12,830,715	0.2%	Rank history: not on the FY2021–FY2023 lists and #84 in FY2025; up 23 since FY2023.
85	VXL Enterprises LLC Top agencies DOS (Department of State)	$12,345,238	0.2%	Rank history: #74 in FY2021, #49 in FY2022, #62 in FY2023 and #85 in FY2025; down 23 since FY2023.
86	Koniag Professional Services, LLC Top agencies DARPA (Defense Advanced Research Projects Agency) DOI (Department of the Interior)	$11,886,861	0.2%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2025; up 405 since FY2023.
87	Sicuritalia - Securitas Critical Infrastructure Services Inc JV Top agencies DOS (Department of State)	$11,772,645	0.2%	Rank history: #80 in FY2021, #78 in FY2022, #83 in FY2023 and #92 in FY2025; down 4 since FY2023.
88	Tatitlek Federal Services LLC Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$11,268,854	0.2%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2025; new.
89	Strategic Security Corp 2 awardees Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$11,138,718	0.2%	Rank history: not on the FY2021 list, #79 in FY2022, not on the FY2023 list and #66 in FY2025; up 19 since FY2023.
90	Constellis, LLC Through Omniplex World Services Corporation Top agencies DHS (Department of Homeland Security) SSA (Social Security Administration)	$11,036,334	0.2%	Rank history: not on the FY2021–FY2023 lists and #89 in FY2025; new.
91	Protection Unit Top agencies Army (Department of the Army)	$10,776,063	0.2%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2025; new.
92	Elliott Security Solutions LLC Top agencies DHS (Department of Homeland Security)	$10,469,205	0.2%	Rank history: not on the FY2021 list, #86 in FY2022, #79 in FY2023 and #72 in FY2025; down 13 since FY2023.
93	Praetorian Standard, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$10,442,770	0.2%	Rank history: #62 in FY2021, #53 in FY2022, #74 in FY2023 and not on the FY2025 list; down 19 since FY2023.
94	Defense Contracting Activity, LLC Top agencies USDA (Department of Agriculture) EPA (Environmental Protection Agency)	$10,244,365	0.2%	Rank history: #92 in FY2021, not on the FY2022–FY2023 lists and #77 in FY2025; up 9 since FY2023.
95	Coventbridge (USA) LLC Top agencies USDA (Department of Agriculture)	$9,922,947	0.1%	Rank history: not on the FY2021–FY2023 lists and #93 in FY2025; new.
96	Johnson Security Bureau, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$9,373,491	0.1%	Rank history: not on the FY2021–FY2023 lists and #70 in FY2025; up 283 since FY2023.
97	Inner-Parish Security, Corp Top agencies DHS (Department of Homeland Security)	$9,124,103	0.1%	Rank history: #82 in FY2021, #82 in FY2022, #76 in FY2023 and not on the FY2025 list; down 21 since FY2023.
98	Bering Straits Native Corporation Through Bering Global Solutions, LLC Top agencies Navy (Department of the Navy) DOT (Department of Transportation)	$8,974,477	0.1%	Rank history: #45 in FY2021, #42 in FY2022, #44 in FY2023 and not on the FY2025 list; down 54 since FY2023.
99	North Texas Investors Group, Inc. Top agencies DISA (Defense Information Systems Agency) VA (Department of Veterans Affairs)	$8,677,639	0.1%	Rank history: #89 in FY2021, #54 in FY2022, #94 in FY2023 and not on the FY2025 list; down 5 since FY2023.
100	Aegis-Kk Security Top agencies DOS (Department of State)	$8,651,091	0.1%	Rank history: #86 in FY2021, not on the FY2022 list, #93 in FY2023 and not on the FY2025 list; down 7 since FY2023.

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100 of 899 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	$5,666,229,558	Metropolitan Security Services, Inc.
561611 Investigation and Personal Background Check Services	$730,220,737	CACI International Inc.
561613 Armored Car Services	$3,882,760	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 $6.74 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. 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 FY2024?

1. Metropolitan Security Services, Inc. ($504M), 2. Omniplex World Services Corp ($287M), 3. Securitas Electronic Security Inc. ($278M), 4. Securitas AB ($275M), 5. The GEO Group, Inc. ($254M), 6. Triple Canopy Inc. ($241M), 7. CACI International Inc. ($216M), 8. Mvm, Inc. ($214M), 9. Corecivic, Inc. ($187M), 10. BC Partners LLP ($184M).

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