Top 100 Contractors in NAICS 56161: Investigation, Guard, and Armored Car Services, FY2021

Name: Top 100 Contractors in NAICS 56161: Investigation, Guard, and Armored Car Services, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 47% of FY2021 NAICS 56161 contract dollars

Contract obligations: $5,824,182,301 Net of deobligations, by contracts coded NAICS 56161 or a code under it
Contractors: 872 Parent companies with an obligation
Largest contractor: Securitas AB $718 million, 11.6% 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	Securitas AB 3 awardees, including Paragon Systems Inc. and Securitas Critical Infrastructure Services, Inc. Top agencies DHS (Department of Homeland Security) AOUSC (Administrative Office of the U.S. Courts) DCSA (Defense Counterintelligence and Security Agency)	$717,802,063	11.6%	Rank history: #2 in FY2022, #1 in FY2023, #4 in FY2024 and not on the FY2025 list; up 1 since FY2020.
2	Triple Canopy Inc. 4 awardees, including Centerra Group, LLC and Omniplex World Services Corporation Top agencies DHS (Department of Homeland Security) DOS (Department of State) AOUSC (Administrative Office of the U.S. Courts)	$670,113,985	10.9%	Rank history: #1 in FY2022, #2 in FY2023, #6 in FY2024 and #3 in FY2025; down 1 since FY2020.
3	CACI International Inc. 2 awardees, including Caci Premier Technology, LLC and Caci, Inc. - Federal Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$234,361,870	3.8%	Rank history: #12 in FY2022, #8 in FY2023, #7 in FY2024 and #7 in FY2025; up 5 since FY2020.
4	The Day & Zimmermann Group, Inc. Through SOC LLC Top agencies DOS (Department of State) DOE (Department of Energy)	$201,528,834	3.3%	Rank history: #6 in FY2022, #17 in FY2023, #74 in FY2024 and not on the FY2025 list; down 1 since FY2020.
5	Metropolitan Security Services, Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$194,294,040	3.1%	Rank history: #5 in FY2022, #4 in FY2023, #1 in FY2024 and #2 in FY2025; unchanged since FY2020.
6	Perspecta Inc. Through Peraton Risk Decision Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$181,279,740	2.9%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
7	Inter-Con Security Systems, Inc. Top agencies DOS (Department of State) DOJ (Department of Justice) DOI (Department of the Interior)	$176,158,590	2.9%	Rank history: #9 in FY2022, #11 in FY2023, #11 in FY2024 and #8 in FY2025; down 1 since FY2020.
8	G4S Holding One Inc. 8 awardees, including G4S Secure Integration LLC, G4S Secure Solutions (USA) Inc. and G4S Secure Solutions International Inc. Top agencies DOS (Department of State) DHS (Department of Homeland Security) DOI (Department of the Interior)	$175,390,268	2.8%	Rank history: #8 in FY2022, #10 in FY2023, #33 in FY2024 and not on the FY2025 list; up 5 since FY2020.
9	The GEO Group, Inc. 2 awardees Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$164,190,312	2.7%	Rank history: #4 in FY2022, #5 in FY2023, #5 in FY2024 and #4 in FY2025; up 2 since FY2020.
10	Aegis Defense Services, 11 awardees, including Gardaworld Federal Services LLC, Garda CL Northwest, Inc. and Garda CL Southeast, Inc. Top agencies DOS (Department of State) Army (Department of the Army) USAF (Department of the Air Force)	$156,357,185	2.5%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
11	Corecivic, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$152,055,318	2.5%	Rank history: #7 in FY2022, #9 in FY2023, #9 in FY2024 and #5 in FY2025; up 1 since FY2020.
12	Mvm, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$134,535,089	2.2%	Rank history: #3 in FY2022, #6 in FY2023, #8 in FY2024 and #10 in FY2025; up 3 since FY2020.
13	Pond Security Service GMBH Top agencies Army (Department of the Army) DOS (Department of State) DODEA (Department of Defense Education Activity)	$126,227,833	2.0%	Rank history: #11 in FY2022, #13 in FY2023, #15 in FY2024 and #14 in FY2025; down 4 since FY2020.
14	Nana Regional Corporation Inc 3 awardees, including Akima Global Services, LLC, Rivertech LLC and Lockwood Hills Federal LLC Top agencies DHS (Department of Homeland Security) DCSA (Defense Counterintelligence and Security Agency) NASA (National Aeronautics and Space Administration)	$125,696,128	2.0%	Rank history: #14 in FY2022, #16 in FY2023, #26 in FY2024 and #23 in FY2025; up 7 since FY2020.
15	Covenant Aviation Security LLC Top agencies DHS (Department of Homeland Security)	$114,368,249	1.9%	Rank history: #13 in FY2022, #12 in FY2023, #12 in FY2024 and #12 in FY2025; down 1 since FY2020.
16	Asrc Federal Professional Services, LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$71,813,085	1.2%	Rank history: #38 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; up 28 since FY2020.
17	Golden Svcs, LLC Top agencies DHS (Department of Homeland Security) DOE (Department of Energy) NASA (National Aeronautics and Space Administration)	$70,185,956	1.1%	Rank history: #15 in FY2022, #29 in FY2023, #40 in FY2024 and #36 in FY2025; unchanged since FY2020.
18	Vendtech-Sgi LLC Top agencies DHS (Department of Homeland Security)	$64,287,060	1.0%	Rank history: #19 in FY2022, #21 in FY2023, #21 in FY2024 and #22 in FY2025; up 2 since FY2020.
19	Diversified Protection Corp Top agencies DHS (Department of Homeland Security) WHS (DOD Washington Headquarters Service) DOL (Department of Labor)	$63,380,676	1.0%	Rank history: #18 in FY2022, #22 in FY2023, #34 in FY2024 and #27 in FY2025; up 3 since FY2020.
20	EOD Technology Inc. Through Acuity - Janus Global, LLC Top agencies DOS (Department of State)	$55,894,927	0.9%	Rank history: #17 in FY2022, #25 in FY2023, #61 in FY2024 and not on the FY2025 list; up 10 since FY2020.
21	Afognak Native Corporation 5 awardees, including Alutiiq Advanced Security Solutions LLC, Shields Point LLC and Alutiiq Security & Technology, LLC Top agencies DHS (Department of Homeland Security) NASA (National Aeronautics and Space Administration) DOJ (Department of Justice)	$54,565,678	0.9%	Rank history: #40 in FY2022, #50 in FY2023, #75 in FY2024 and not on the FY2025 list; up 20 since FY2020.
22	Global Precision Systems, LLC Top agencies DHS (Department of Homeland Security)	$54,536,028	0.9%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; up 3 since FY2020.
23	VMD Systems Integrators, LLC Top agencies DHS (Department of Homeland Security)	$47,454,913	0.8%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
24	Chenega Infinity, LLC Top agencies DHS (Department of Homeland Security) MDA (DOD Missile Defense Agency) DOI (Department of the Interior)	$46,854,021	0.8%	Rank history: #20 in FY2022, #24 in FY2023, #48 in FY2024 and #76 in FY2025; down 6 since FY2020.
25	CDA Incorporated Top agencies DHS (Department of Homeland Security)	$45,553,774	0.7%	Rank history: #28 in FY2022, #38 in FY2023, #24 in FY2024 and #21 in FY2025; down 2 since FY2020.
26	ISS Action Inc. Top agencies DHS (Department of Homeland Security) CFPB (Consumer Financial Protection Bureau) DOI (Department of the Interior)	$44,427,202	0.7%	Rank history: #22 in FY2022, #20 in FY2023, #27 in FY2024 and #44 in FY2025; up 2 since FY2020.
27	Universal Protection GP, LLC 2 awardees, including Universal Protection Service, Limited Partnership and Universal Protection Service, LLC Top agencies Smithsonian (Smithsonian Institution) DHS (Department of Homeland Security) DOI (Department of the Interior)	$41,363,304	0.7%	Rank history: #24 in FY2022, #18 in FY2023, #29 in FY2024 and not on the FY2025 list; up 81 since FY2020.
28	North American Security, Incorporated Top agencies DHS (Department of Homeland Security) Commerce (Department of Commerce) USAF (Department of the Air Force)	$40,206,561	0.7%	Rank history: #32 in FY2022, #32 in FY2023, #35 in FY2024 and #41 in FY2025; down 1 since FY2020.
29	Securamerica, LLC Through American Security Programs Inc. Top agencies DHS (Department of Homeland Security) GAO (Government Accountability Office) NARA (National Archives and Records Administration)	$38,956,716	0.6%	Rank history: #90 in FY2022, #57 in FY2023, #80 in FY2024 and not on the FY2025 list; down 13 since FY2020.
30	American Security Programs Inc 2 awardees, including Sos Security LLC Top agencies DHS (Department of Homeland Security) DOS (Department of State) SEC (Securities and Exchange Commission)	$38,696,031	0.6%	Rank history: #16 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; up 88 since FY2020.
31	Centerra Group, LLC Top agencies AOUSC (Administrative Office of the U.S. Courts) DOE (Department of Energy)	$38,137,166	0.6%	Rank history: not on the FY2022–FY2023 lists, #13 in FY2024 and #16 in FY2025; down 5 since FY2020.
32	Management & Training Corporation Top agencies DHS (Department of Homeland Security)	$36,734,130	0.6%	Rank history: #31 in FY2022, #28 in FY2023, #32 in FY2024 and #28 in FY2025; down 1 since FY2020.
33	Hana Industries, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) DOT (Department of Transportation)	$34,136,472	0.6%	Rank history: #34 in FY2022, #34 in FY2023, #41 in FY2024 and #32 in FY2025; up 4 since FY2020.
34	KR Contracting Inc. Top agencies DHS (Department of Homeland Security)	$30,963,725	0.5%	Rank history: #35 in FY2022, #47 in FY2023, #66 in FY2024 and #90 in FY2025; up 2 since FY2020.
35	Ahtna, Incorporated Through Ahtna Support & Training Services LLC Top agencies DHS (Department of Homeland Security)	$30,642,581	0.5%	Rank history: #30 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
36	The Chenega Corporation 3 awardees, including Chenega Global Protection, LLC and Chenega Security & Support Solutions, LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) Navy (Department of the Navy)	$29,131,095	0.5%	Rank history: #26 in FY2022, #14 in FY2023, #39 in FY2024 and not on the FY2025 list; up 67 since FY2020.
37	Aviation Security Management LLC Top agencies DHS (Department of Homeland Security)	$26,373,228	0.4%	Rank history: #29 in FY2022, #30 in FY2023, #54 in FY2024 and #50 in FY2025; up 19 since FY2020.
38	Protection Strategies Inc. Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services) DOE (Department of Energy)	$25,888,930	0.4%	Rank history: #21 in FY2022, #31 in FY2023, #45 in FY2024 and #45 in FY2025; up 5 since FY2020.
39	Culpepper & Associates Security Services Inc. Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) DOE (Department of Energy)	$24,415,332	0.4%	Rank history: #46 in FY2022, #51 in FY2023, #63 in FY2024 and #56 in FY2025; up 11 since FY2020.
40	Master Security Company LLC Top agencies DHS (Department of Homeland Security)	$23,576,972	0.4%	Rank history: #41 in FY2022, #39 in FY2023, #50 in FY2024 and #97 in FY2025; up 24 since FY2020.
41	Sullivan Cove Consultants, LLC Top agencies DOJ (Department of Justice)	$23,409,304	0.4%	Rank history: #33 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
42	Nve, Inc. Top agencies DOS (Department of State)	$22,795,750	0.4%	Rank history: #27 in FY2022, #36 in FY2023, not on the FY2024 list and #25 in FY2025; up 4 since FY2020.
43	American-Paragon Protective Services LLC Top agencies NASA (National Aeronautics and Space Administration)	$22,568,008	0.4%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
44	HP Enterprise Services LLC Through Peraton Risk Decision Inc. Top agencies DHS (Department of Homeland Security)	$21,071,409	0.3%	Rank history: #10 in FY2022, #7 in FY2023, #18 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
45	Bering Straits Native Corporation Through Bering Global Solutions, LLC Top agencies DOT (Department of Transportation) Navy (Department of the Navy)	$20,923,478	0.3%	Rank history: #42 in FY2022, #44 in FY2023, #98 in FY2024 and not on the FY2025 list; unchanged since FY2020.
46	Patronus Systems Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$20,338,498	0.3%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
47	Apsi-Centerra JV, LLC Top agencies DHS (Department of Homeland Security) AOUSC (Administrative Office of the U.S. Courts)	$20,288,583	0.3%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
48	Ids International, LLC Top agencies DOS (Department of State) NARA (National Archives and Records Administration)	$18,744,100	0.3%	Rank history: not on the FY2022–FY2023 lists, #51 in FY2024 and #48 in FY2025; up 15 since FY2020.
49	Excalibur Associates Inc. 2 awardees, including Excalibur Security Services Inc. Top agencies USDA (Department of Agriculture) Commerce (Department of Commerce) DHS (Department of Homeland Security)	$17,779,356	0.3%	Rank history: #44 in FY2022, #40 in FY2023, #53 in FY2024 and #74 in FY2025; up 32 since FY2020.
50	Spectrum Security Services, Inc. Top agencies DHS (Department of Homeland Security)	$17,649,846	0.3%	Rank history: #47 in FY2022, #49 in FY2023, #60 in FY2024 and #49 in FY2025; up 3 since FY2020.
51	American Eagle Protective Services Corp Top agencies DHS (Department of Homeland Security) DOL (Department of Labor)	$17,310,417	0.3%	Rank history: #83 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
52	Trinity Technology Group, Inc. Top agencies DHS (Department of Homeland Security)	$17,003,223	0.3%	Rank history: #58 in FY2022, #65 in FY2023, #64 in FY2024 and #94 in FY2025; up 9 since FY2020.
53	United Security Inc. Top agencies DOJ (Department of Justice)	$16,962,418	0.3%	Rank history: #66 in FY2022, #48 in FY2023, #57 in FY2024 and #58 in FY2025; up 12 since FY2020.
54	Iworks Corp Top agencies DCSA (Defense Counterintelligence and Security Agency)	$16,686,139	0.3%	Rank history: #62 in FY2022, not on the FY2023–FY2024 lists and #59 in FY2025; new, not ranked in FY2020.
55	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)	$16,144,698	0.3%	Rank history: #52 in FY2022, #43 in FY2023, #58 in FY2024 and #39 in FY2025; up 7 since FY2020.
56	Kerberos International, Inc. 2 awardees, including Acadia Protective Services II, LLC Top agencies DHS (Department of Homeland Security) DOT (Department of Transportation) DOI (Department of the Interior)	$16,133,310	0.3%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; up 31 since FY2020.
57	PAE Government Services Inc. Through PAE Professional Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$15,687,876	0.3%	Rank history: #48 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; up 21 since FY2020.
58	Alante Security Group, Inc. Top agencies DHS (Department of Homeland Security)	$14,835,988	0.2%	Rank history: #94 in FY2022, #61 in FY2023, #68 in FY2024 and #68 in FY2025; up 13 since FY2020.
59	I3 Pathfinder USA LLC Top agencies DOS (Department of State)	$14,643,287	0.2%	Rank history: #60 in FY2022, #63 in FY2023, #69 in FY2024 and #61 in FY2025; up 7 since FY2020.
60	Jang Pung HR Ltd. Top agencies Army (Department of the Army)	$14,602,662	0.2%	Rank history: not on the FY2022–FY2025 lists; up 56 since FY2020.
61	Accenture Federal Services LLC Top agencies Commerce (Department of Commerce)	$14,298,329	0.2%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
62	Praetorian Standard, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$14,201,772	0.2%	Rank history: #53 in FY2022, #74 in FY2023, #93 in FY2024 and not on the FY2025 list; up 10 since FY2020.
63	Ahtna Support & Training Services LLC Top agencies DHS (Department of Homeland Security)	$14,200,313	0.2%	Rank history: not on the FY2022–FY2025 lists; down 23 since FY2020.
64	Prudential Protective Services LLC Top agencies DOJ (Department of Justice) Commerce (Department of Commerce)	$13,994,708	0.2%	Rank history: not on the FY2022–FY2025 lists; up 36 since FY2020.
65	Elite Protective Services, Inc. Top agencies DHS (Department of Homeland Security)	$13,740,153	0.2%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; up 2 since FY2020.
66	The Cogar Group. Ltd. Top agencies Commerce (Department of Commerce) VA (Department of Veterans Affairs) DHS (Department of Homeland Security)	$13,668,866	0.2%	Rank history: #63 in FY2022, #58 in FY2023, #77 in FY2024 and #64 in FY2025; up 4 since FY2020.
67	Chenega Security International, LLC Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$13,617,232	0.2%	Rank history: #55 in FY2022, #71 in FY2023, #73 in FY2024 and #80 in FY2025; up 1 since FY2020.
68	Capital Center for Credibility Assessment Corporation Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$13,018,183	0.2%	Rank history: #61 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; up 28 since FY2020.
69	Athena Joint Venture Services, LLC Top agencies DHS (Department of Homeland Security)	$12,787,554	0.2%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
70	Prosecure, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$12,550,896	0.2%	Rank history: #69 in FY2022, #70 in FY2023, #83 in FY2024 and #73 in FY2025; up 114 since FY2020.
71	Madison Associates Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) DOS (Department of State)	$12,355,736	0.2%	Rank history: #64 in FY2022, #55 in FY2023, #55 in FY2024 and #38 in FY2025; up 11 since FY2020.
72	Professional Risk Management, Inc. Top agencies DOJ (Department of Justice)	$12,238,783	0.2%	Rank history: #67 in FY2022, #56 in FY2023, #42 in FY2024 and #42 in FY2025; up 7 since FY2020.
73	Ameriguard Security Services, Inc. Top agencies HHS (Department of Health and Human Services) SSA (Social Security Administration) VA (Department of Veterans Affairs)	$12,182,892	0.2%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
74	VXL Enterprises LLC Top agencies DOS (Department of State)	$12,165,275	0.2%	Rank history: #49 in FY2022, #62 in FY2023, #85 in FY2024 and #85 in FY2025; up 19 since FY2020.
75	Excelsior Defense, Inc. Top agencies VA (Department of Veterans Affairs) PBGC (Pension Benefit Guaranty Corporation)	$12,056,816	0.2%	Rank history: #73 in FY2022, #82 in FY2023 and not on the FY2024–FY2025 lists; up 19 since FY2020.
76	U.S. Security Associates Inc. 3 awardees, including FJC Security Services Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$11,776,704	0.2%	Rank history: #91 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
77	Surveillance Security, Inc. Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DLA (Defense Logistics Agency)	$11,061,803	0.2%	Rank history: #74 in FY2022, #67 in FY2023, #59 in FY2024 and #75 in FY2025; up 22 since FY2020.
78	Guard Force Inc. Top agencies VA (Department of Veterans Affairs)	$10,835,092	0.2%	Rank history: #87 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; up 49 since FY2020.
79	Security Walls LLC Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army) USDA (Department of Agriculture)	$10,543,599	0.2%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
80	Sicuritalia - Securitas Critical Infrastructure Services Inc JV Top agencies DOS (Department of State)	$10,491,842	0.2%	Rank history: #78 in FY2022, #83 in FY2023, #87 in FY2024 and #92 in FY2025; up 6 since FY2020.
81	SEPARGEFI Through Seris Security Top agencies Army (Department of the Army)	$10,428,607	0.2%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; up 26 since FY2020.
82	Inner-Parish Security, Corp Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$10,045,249	0.2%	Rank history: #82 in FY2022, #76 in FY2023, #97 in FY2024 and not on the FY2025 list; up 13 since FY2020.
83	NV Securitas Securitas Critical Infrastructure Services Soc. Top agencies DOS (Department of State)	$9,991,353	0.2%	Rank history: #95 in FY2022, #99 in FY2023 and not on the FY2024–FY2025 lists; up 39 since FY2020.
84	The J. Diamond Group. Inc. Top agencies DHS (Department of Homeland Security)	$9,466,665	0.2%	Rank history: not on the FY2022–FY2025 lists; down 27 since FY2020.
85	Gardaworld Federal Nigeria Top agencies DOS (Department of State)	$9,246,496	0.1%	Rank history: #81 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; up 57 since FY2020.
86	Aegis-Kk Security Top agencies DOS (Department of State)	$8,628,223	0.1%	Rank history: not on the FY2022 list, #93 in FY2023, #100 in FY2024 and not on the FY2025 list; down 3 since FY2020.
87	MSS Security PTY Limited Top agencies DOS (Department of State)	$8,073,722	0.1%	Rank history: #99 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; up 80 since FY2020.
88	Trailboss Enterprises, Inc. Top agencies DHS (Department of Homeland Security)	$7,986,872	0.1%	Rank history: not on the FY2022–FY2023 lists, #36 in FY2024 and #29 in FY2025; down 33 since FY2020.
89	North Texas Investors Group, Inc. Top agencies VA (Department of Veterans Affairs) DISA (Defense Information Systems Agency)	$7,965,459	0.1%	Rank history: #54 in FY2022, #94 in FY2023, #99 in FY2024 and not on the FY2025 list; up 92 since FY2020.
90	Security Alliance LLC Top agencies DOS (Department of State)	$7,889,814	0.1%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
91	B O S Security, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$7,697,507	0.1%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
92	Defense Contracting Activity, LLC Top agencies USDA (Department of Agriculture)	$7,606,279	0.1%	Rank history: not on the FY2022–FY2023 lists, #94 in FY2024 and #77 in FY2025; up 76 since FY2020.
93	Bradley Technologies Inc. Top agencies DHS (Department of Homeland Security) CFTC (Commodity Futures Trading Commission)	$7,575,774	0.1%	Rank history: #84 in FY2022, #33 in FY2023, #23 in FY2024 and #19 in FY2025; up 22 since FY2020.
94	Jackson Hole Airport Board Top agencies DHS (Department of Homeland Security)	$7,550,761	0.1%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
95	Security Watch Inc. Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security) DOI (Department of the Interior)	$7,504,530	0.1%	Rank history: not on the FY2022–FY2025 lists; up 18 since FY2020.
96	Westmoreland Protection Agency, Inc. Top agencies VA (Department of Veterans Affairs)	$7,481,689	0.1%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; up 34 since FY2020.
97	Equifax Inc. Through Equifax Workforce Solutions LLC Top agencies SSA (Social Security Administration) DCSA (Defense Counterintelligence and Security Agency) DOJ (Department of Justice)	$7,375,353	0.1%	Rank history: #97 in FY2022, #81 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
98	Anasec, Inc. Top agencies DHS (Department of Homeland Security)	$7,072,973	0.1%	Rank history: not on the FY2022–FY2025 lists; up 16 since FY2020.
99	First Coast Security Solutions, Inc. Top agencies DHS (Department of Homeland Security)	$6,961,324	0.1%	Rank history: #100 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
100	Five Stones Intelligence Inc. Top agencies DOJ (Department of Justice) DOS (Department of State)	$6,928,054	0.1%	Rank history: #72 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; up 39 since FY2020.

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100 of 872 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	$4,986,160,136	Triple Canopy Inc.
561611 Investigation and Personal Background Check Services	$832,741,189	CACI International Inc.
561613 Armored Car Services	$5,280,976	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 $6.17 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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 FY2021?

1. Securitas AB ($718M), 2. Triple Canopy Inc. ($670M), 3. CACI International Inc. ($234M), 4. The Day & Zimmermann Group, Inc. ($202M), 5. Metropolitan Security Services, Inc. ($194M), 6. Perspecta Inc. ($181M), 7. Inter-Con Security Systems, Inc. ($176M), 8. G4S Holding One Inc. ($175M), 9. The GEO Group, Inc. ($164M), 10. Aegis Defense Services, ($156M).

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