Top 100 Contractors in NAICS 56162: Security Systems Services, FY2023

Name: Top 100 Contractors in NAICS 56162: Security Systems Services, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 46% of FY2023 NAICS 56162 contract dollars

Contract obligations: $767,565,983 Net of deobligations, by contracts coded NAICS 56162 or a code under it
Contractors: 999 Parent companies with an obligation
Largest contractor: M. C. Dean Inc. $91.8 million, 11.4% 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	M. C. Dean Inc. Through M.c. Dean, Inc. Top agencies DOD (Department of Defense) AOUSC (Administrative Office of the U.S. Courts) DOT (Department of Transportation)	$91,833,334	11.4%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2024 and #1 in FY2025; unchanged since FY2022.
2	Securitas AB 3 awardees, including Paragon Systems Inc. and Securitas OY Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOS (Department of State)	$50,534,980	6.3%	Rank history: #68 in FY2021, #9 in FY2022, #5 in FY2024 and not on the FY2025 list; up 7 since FY2022.
3	Johnson Controls Security Solutions LLC 8 awardees, including Johnson Controls Fire Protection LP, Johnson Controls Building Automation Systems, LLC and Johnson Controls Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$43,440,611	5.4%	Rank history: #2 in FY2021, #3 in FY2022, #6 in FY2024 and #6 in FY2025; unchanged since FY2022.
4	Serco Inc Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$40,144,449	5.0%	Rank history: not on the FY2021–FY2022 lists, #2 in FY2024 and #2 in FY2025; new.
5	Omniplex World Services Corp Through Triple Canopy Inc. Top agencies DHS (Department of Homeland Security)	$34,346,854	4.3%	Rank history: not on the FY2021–FY2022 lists, #14 in FY2024 and not on the FY2025 list; up 129 since FY2022.
6	CACI International Inc. 3 awardees, including Caci, Inc. - Federal Top agencies USAF (Department of the Air Force)	$28,512,009	3.5%	Rank history: #5 in FY2021, #7 in FY2022, #7 in FY2024 and #5 in FY2025; up 1 since FY2022.
7	Serco North America (Holdings) Inc Through Serco Inc. Top agencies Navy (Department of the Navy)	$25,343,490	3.2%	Rank history: #3 in FY2021, #4 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
8	Xator LLC Top agencies USAF (Department of the Air Force)	$22,776,072	2.8%	Rank history: #7 in FY2021, #5 in FY2022, #31 in FY2024 and not on the FY2025 list; down 3 since FY2022.
9	Johnson Controls Industries 4 awardees, including Johnson Controls Building Automation Systems, LLC, Johnson Controls, Inc. and Johnson Controls, K.K. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOJ (Department of Justice)	$19,761,202	2.5%	Rank history: not on the FY2021–FY2022 lists, #43 in FY2024 and not on the FY2025 list; new.
10	The Chenega Corporation 3 awardees, including Chenega Integrated Security Solutions, LLC and Chenega Global Protection, LLC Top agencies SEC (Securities and Exchange Commission) DOJ (Department of Justice) MDA (DOD Missile Defense Agency)	$16,824,173	2.1%	Rank history: #6 in FY2021, #10 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
11	Kbr, Inc. 2 awardees, including KBR Wyle Services, LLC Top agencies AOUSC (Administrative Office of the U.S. Courts) DOT (Department of Transportation) DOJ (Department of Justice)	$12,502,847	1.6%	Rank history: #8 in FY2021, #69 in FY2022, #88 in FY2024 and not on the FY2025 list; up 58 since FY2022.
12	Versar Inc. Through Versar Security Systems, LLC Top agencies DOT (Department of Transportation) AOUSC (Administrative Office of the U.S. Courts) GAO (Government Accountability Office)	$9,906,661	1.2%	Rank history: #10 in FY2021, #12 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
13	Johnson Controls Fire Protection LP 9 awardees Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) Army (Department of the Army)	$9,496,972	1.2%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2024 and not on the FY2025 list; new.
14	Advanced Technology Systems Company, Inc. (OF Virginia) Top agencies USAF (Department of the Air Force)	$8,402,817	1.0%	Rank history: #37 in FY2021, #2 in FY2022, #4 in FY2024 and not on the FY2025 list; down 12 since FY2022.
15	Trofholz Technologies Inc. 2 awardees Top agencies USSOCOM (United States Special Operations Command) Navy (Department of the Navy) DISA (Defense Information Systems Agency)	$7,131,107	0.9%	Rank history: #19 in FY2021, #15 in FY2022, #22 in FY2024 and #24 in FY2025; unchanged since FY2022.
16	Hurtvet Subcontracting LLC 2 awardees Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior) Army (Department of the Army)	$7,097,969	0.9%	Rank history: #18 in FY2021, #27 in FY2022, #24 in FY2024 and #27 in FY2025; up 11 since FY2022.
17	SRC Inc. Through Srctec, LLC Top agencies USAF (Department of the Air Force)	$6,942,382	0.9%	Rank history: #9 in FY2021, #20 in FY2022, #100 in FY2024 and not on the FY2025 list; up 3 since FY2022.
18	Scdatacom LLC Top agencies VA (Department of Veterans Affairs) DISA (Defense Information Systems Agency) DOJ (Department of Justice)	$6,190,847	0.8%	Rank history: #74 in FY2021, #23 in FY2022, #12 in FY2024 and #11 in FY2025; up 5 since FY2022.
19	Cherokee Nation System Solutions LLC Top agencies Treasury (Department of the Treasury)	$6,110,889	0.8%	Rank history: #39 in FY2021, #30 in FY2022, #16 in FY2024 and not on the FY2025 list; up 11 since FY2022.
20	Trilogy Secured Services, L.l.c Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) DOJ (Department of Justice)	$5,809,934	0.7%	Rank history: #59 in FY2021, #68 in FY2022, #28 in FY2024 and #86 in FY2025; up 48 since FY2022.
21	Evergreen Fire Alarms LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$5,651,879	0.7%	Rank history: #11 in FY2021, #31 in FY2022, #30 in FY2024 and #17 in FY2025; up 10 since FY2022.
22	Media Plumbing & Heating Inc. Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) DLA (Defense Logistics Agency)	$5,489,864	0.7%	Rank history: #14 in FY2021, #14 in FY2022, #17 in FY2024 and #14 in FY2025; down 8 since FY2022.
23	Vectrus Systems Corporation Through Advantor Systems II LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$5,244,042	0.7%	Rank history: #21 in FY2021, #61 in FY2022 and not on the FY2024–FY2025 lists; up 38 since FY2022.
24	Itm4G LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$5,218,987	0.6%	Rank history: #43 in FY2021, #22 in FY2022, #26 in FY2024 and #21 in FY2025; down 2 since FY2022.
25	Versar Security Systems, LLC Top agencies DOT (Department of Transportation)	$4,994,074	0.6%	Rank history: not on the FY2021 list, #21 in FY2022, #11 in FY2024 and #20 in FY2025; down 4 since FY2022.
26	Indyne, Inc. 2 awardees Top agencies USAF (Department of the Air Force)	$4,837,956	0.6%	Rank history: #15 in FY2021, #19 in FY2022, #21 in FY2024 and #18 in FY2025; down 7 since FY2022.
27	National Project Management LLC Top agencies VA (Department of Veterans Affairs)	$4,747,903	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
28	Siemens Aktiengesellschaft 4 awardees, including Siemens Industry Inc., Siemens Corporation and Siemens Canada Limited Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) DOJ (Department of Justice)	$4,422,091	0.6%	Rank history: #16 in FY2021, #13 in FY2022, #45 in FY2024 and not on the FY2025 list; down 15 since FY2022.
29	Intertech Security Group LLC Through Intertech Security, LLC Top agencies VA (Department of Veterans Affairs)	$4,336,803	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 379 since FY2022.
30	Signet Technologies Inc. 2 awardees, including Convergint Technologies LLC Top agencies VA (Department of Veterans Affairs) DISA (Defense Information Systems Agency) DLA (Defense Logistics Agency)	$4,309,383	0.5%	Rank history: #38 in FY2021, #60 in FY2022, #37 in FY2024 and #65 in FY2025; up 30 since FY2022.
31	Parsons Corporation 3 awardees, including Ptsi Managed Services Inc. and Williams Electric Co Inc. Top agencies Smithsonian (Smithsonian Institution) Army (Department of the Army)	$4,194,794	0.5%	Rank history: not on the FY2021 list, #51 in FY2022, #19 in FY2024 and #7 in FY2025; up 20 since FY2022.
32	Global Resource Solutions Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$4,163,898	0.5%	Rank history: #40 in FY2021, #43 in FY2022, #36 in FY2024 and #26 in FY2025; up 11 since FY2022.
33	Olgoonik Corporation 2 awardees, including Olgoonik Solutions LLC Top agencies DOE (Department of Energy)	$4,113,099	0.5%	Rank history: #26 in FY2021, #42 in FY2022, #95 in FY2024 and not on the FY2025 list; up 9 since FY2022.
34	Corelogix Consulting Inc. Top agencies DHS (Department of Homeland Security)	$3,978,419	0.5%	Rank history: #80 in FY2021, #16 in FY2022, #91 in FY2024 and #70 in FY2025; down 18 since FY2022.
35	Concord Crossroads LLC Top agencies Army (Department of the Army)	$3,829,916	0.5%	Rank history: #30 in FY2021, #34 in FY2022, #60 in FY2024 and not on the FY2025 list; down 1 since FY2022.
36	Electripro, Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$3,719,488	0.5%	Rank history: not on the FY2021 list, #18 in FY2022, not on the FY2024 list and #33 in FY2025; down 18 since FY2022.
37	Low Voltage Wiring Ltd Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOJ (Department of Justice)	$3,716,885	0.5%	Rank history: #20 in FY2021, not on the FY2022 list, not on the FY2024 list and #35 in FY2025; returned.
38	Firelake Construction Inc 2 awardees Top agencies Army (Department of the Army) DISA (Defense Information Systems Agency) USDA (Department of Agriculture)	$3,609,059	0.4%	Rank history: #31 in FY2021, #41 in FY2022, #29 in FY2024 and #23 in FY2025; up 3 since FY2022.
39	Integrated Security Technologies Inc. Top agencies Navy (Department of the Navy) GSA (General Services Administration) USAF (Department of the Air Force)	$3,598,495	0.4%	Rank history: #35 in FY2021, #62 in FY2022, #34 in FY2024 and #59 in FY2025; up 23 since FY2022.
40	Vista Defense Technologies, LLC Top agencies Army (Department of the Army)	$3,405,531	0.4%	Rank history: #25 in FY2021, #36 in FY2022, #32 in FY2024 and #29 in FY2025; down 4 since FY2022.
41	Honeywell International Inc. 4 awardees, including Vindicator Technologies, Inc. Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) Army (Department of the Army)	$3,357,500	0.4%	Rank history: #93 in FY2021, #63 in FY2022 and not on the FY2024–FY2025 lists; up 22 since FY2022.
42	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security)	$3,352,553	0.4%	Rank history: #17 in FY2021, #26 in FY2022 and not on the FY2024–FY2025 lists; down 16 since FY2022.
43	Total-Evergreen JV LLC Top agencies Army (Department of the Army)	$3,333,059	0.4%	Rank history: not on the FY2021 list, #45 in FY2022, #38 in FY2024 and #42 in FY2025; up 2 since FY2022.
44	Integriward LLC Top agencies DOI (Department of the Interior) Treasury (Department of the Treasury) DLA (Defense Logistics Agency)	$3,234,871	0.4%	Rank history: not on the FY2021–FY2022 lists, #33 in FY2024 and not on the FY2025 list; new.
45	Lbyd Federal, LLC Top agencies OSD (Office of the Secretary of Defense)	$3,229,541	0.4%	Rank history: #45 in FY2021, #81 in FY2022, #48 in FY2024 and #46 in FY2025; up 36 since FY2022.
46	Gonzales Consulting Services Inc. Top agencies SSA (Social Security Administration)	$3,175,277	0.4%	Rank history: #34 in FY2021, #35 in FY2022 and not on the FY2024–FY2025 lists; down 11 since FY2022.
47	KR Contracting Inc. Top agencies OPM (Office of Personnel Management)	$3,139,347	0.4%	Rank history: #44 in FY2021, #48 in FY2022, #81 in FY2024 and #49 in FY2025; up 1 since FY2022.
48	KBR Wyle Services, LLC Top agencies DOT (Department of Transportation)	$3,083,932	0.4%	Rank history: not on the FY2021 list, #44 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
49	Citizen Contracting Group LLC Top agencies VA (Department of Veterans Affairs)	$3,007,551	0.4%	Rank history: not on the FY2021 list, #84 in FY2022 and not on the FY2024–FY2025 lists; up 35 since FY2022.
50	Usmax Corporation Top agencies USAID (US Agency for International Development) DOS (Department of State) USAGM (US Agency for Global Media)	$2,958,374	0.4%	Rank history: #28 in FY2021, #38 in FY2022, not on the FY2024 list and #53 in FY2025; down 12 since FY2022.
51	Adamo Construction Inc. Top agencies Navy (Department of the Navy)	$2,905,573	0.4%	Rank history: #33 in FY2021, #53 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
52	Systems Engineering Inc. Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$2,894,528	0.4%	Rank history: not on the FY2021 list, #65 in FY2022 and not on the FY2024–FY2025 lists; up 13 since FY2022.
53	Kastle Systems LLC Top agencies SEC (Securities and Exchange Commission) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$2,706,132	0.3%	Rank history: #36 in FY2021, #47 in FY2022, #56 in FY2024 and #71 in FY2025; down 6 since FY2022.
54	Ma Impianti S.R.L. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$2,607,315	0.3%	Rank history: #89 in FY2021, #100 in FY2022, not on the FY2024 list and #92 in FY2025; up 46 since FY2022.
55	Echelon Services, LLC Top agencies HUD (Department of Housing and Urban Development)	$2,571,269	0.3%	Rank history: #71 in FY2021, #94 in FY2022, #49 in FY2024 and #31 in FY2025; up 39 since FY2022.
56	TIC Security LLC Top agencies SEC (Securities and Exchange Commission) Commerce (Department of Commerce) DOI (Department of the Interior)	$2,490,824	0.3%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2024 and not on the FY2025 list; new.
57	Rogue Industries LLC Top agencies Treasury (Department of the Treasury)	$2,480,113	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
58	Cynergy Professional Systems LLC Top agencies VA (Department of Veterans Affairs)	$2,195,869	0.3%	Rank history: #72 in FY2021, #33 in FY2022, #69 in FY2024 and #43 in FY2025; down 25 since FY2022.
59	Sanford Federal, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$2,146,452	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
60	Diamond Security, Inc. Top agencies Treasury (Department of the Treasury) GSA (General Services Administration) Navy (Department of the Navy)	$2,135,064	0.3%	Rank history: #76 in FY2021, #39 in FY2022 and not on the FY2024–FY2025 lists; down 21 since FY2022.
61	Hawaiian Native Corporation Through Dawson Mcg, Inc. Top agencies DLA (Defense Logistics Agency)	$2,134,777	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
62	Systems Northwest, LLC Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$2,028,955	0.3%	Rank history: #57 in FY2021, #80 in FY2022, #53 in FY2024 and #44 in FY2025; up 18 since FY2022.
63	Bold Technologies Ltd. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$2,026,856	0.3%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #99 in FY2025; new.
64	Intellimar Inc. 2 awardees, including Concentric Security LLC Top agencies Smithsonian (Smithsonian Institution) USAF (Department of the Air Force) DOI (Department of the Interior)	$2,024,124	0.3%	Rank history: not on the FY2021 list, #88 in FY2022 and not on the FY2024–FY2025 lists; up 24 since FY2022.
65	Securityhunter, Inc. Top agencies Army (Department of the Army) SSA (Social Security Administration)	$2,012,079	0.3%	Rank history: #56 in FY2021, not on the FY2022 list, #55 in FY2024 and not on the FY2025 list; up 114 since FY2022.
66	CWS Fire Safety GMBH Top agencies DOS (Department of State)	$1,984,899	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
67	Condortech Services, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) GSA (General Services Administration)	$1,971,399	0.2%	Rank history: not on the FY2021–FY2022 lists, #65 in FY2024 and #80 in FY2025; up 48 since FY2022.
68	Sernotti Electrical Services LLC Top agencies Navy (Department of the Navy)	$1,952,306	0.2%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2024 and #51 in FY2025; up 54 since FY2022.
69	Cmn, LLC Top agencies DHS (Department of Homeland Security)	$1,928,958	0.2%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2024 and #34 in FY2025; up 139 since FY2022.
70	Cherokee Nation Security & Defense LLC Through Cherokee Federal Solutions, L.L.C. Top agencies Treasury (Department of the Treasury) Army (Department of the Army)	$1,928,812	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
71	West Construction, LLC Top agencies Navy (Department of the Navy)	$1,852,691	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #81 in FY2025; new.
72	Delta Run Security JV2 LLC Top agencies Treasury (Department of the Treasury) EEOC (Equal Employment Opportunity Commission) USDA (Department of Agriculture)	$1,849,377	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
73	Vision Quest Solutions Inc Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy)	$1,833,667	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
74	Nana Regional Corporation Inc. Through Lockwood Hills Federal LLC Top agencies Army (Department of the Army)	$1,832,901	0.2%	Rank history: not on the FY2021 list, #67 in FY2022, not on the FY2024 list and #88 in FY2025; down 7 since FY2022.
75	National Contracting Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$1,817,892	0.2%	Rank history: #64 in FY2021, #58 in FY2022 and not on the FY2024–FY2025 lists; down 17 since FY2022.
76	Chenega Security International, LLC Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force) Army (Department of the Army)	$1,786,141	0.2%	Rank history: #12 in FY2021, #17 in FY2022 and not on the FY2024–FY2025 lists; down 59 since FY2022.
77	Tritel TOV Top agencies DOS (Department of State)	$1,775,608	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
78	Monaco Enterprises, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$1,671,999	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #63 in FY2025; up 87 since FY2022.
79	Smiths Group PLC 2 awardees, including Smiths Detection Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) DOS (Department of State)	$1,596,923	0.2%	Rank history: not on the FY2021 list, #25 in FY2022 and not on the FY2024–FY2025 lists; down 54 since FY2022.
80	Security Operations Group International LLC Top agencies USDA (Department of Agriculture) VA (Department of Veterans Affairs) DISA (Defense Information Systems Agency)	$1,542,834	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 242 since FY2022.
81	Kaiva Services, LLC Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior) USDA (Department of Agriculture)	$1,536,497	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #93 in FY2025; up 33 since FY2022.
82	Hana Technologies & Systems, Inc. Top agencies Navy (Department of the Navy)	$1,530,413	0.2%	Rank history: not on the FY2021 list, #73 in FY2022, #80 in FY2024 and not on the FY2025 list; down 9 since FY2022.
83	Johnsondanforth, Inc. Top agencies VA (Department of Veterans Affairs)	$1,515,740	0.2%	Rank history: #52 in FY2021, #74 in FY2022, #94 in FY2024 and #72 in FY2025; down 9 since FY2022.
84	Optimum Low Voltage LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DOI (Department of the Interior)	$1,493,305	0.2%	Rank history: #82 in FY2021, #86 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
85	Warfeather, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) VA (Department of Veterans Affairs)	$1,492,209	0.2%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2024 and #25 in FY2025; up 240 since FY2022.
86	Government Contracting Services LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$1,433,179	0.2%	Rank history: not on the FY2021 list, #92 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
87	AES Systems Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$1,405,134	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #56 in FY2025; up 34 since FY2022.
88	Shofar Communications LLC Top agencies USAF (Department of the Air Force)	$1,400,452	0.2%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2024 and not on the FY2025 list; new.
89	DK & R Corp Top agencies VA (Department of Veterans Affairs)	$1,360,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
90	Adjoiner Corporation Top agencies USAF (Department of the Air Force)	$1,332,230	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 87 since FY2022.
91	Sentrillion Corporation Top agencies USAF (Department of the Air Force)	$1,322,706	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #79 in FY2025; new.
92	Global Grab Technologies, Inc. Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$1,312,900	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 66 since FY2022.
93	Swan Contracting LLC Top agencies USAF (Department of the Air Force)	$1,260,359	0.2%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2024 and not on the FY2025 list; new.
94	Onerain Incorporated Top agencies DOI (Department of the Interior)	$1,223,798	0.2%	Rank history: #69 in FY2021, #83 in FY2022, #93 in FY2024 and #66 in FY2025; down 11 since FY2022.
95	Ldia Holdings, LLC Top agencies USAF (Department of the Air Force)	$1,214,369	0.2%	Rank history: not on the FY2021 list, #59 in FY2022, #73 in FY2024 and #61 in FY2025; down 36 since FY2022.
96	Eagle Fire Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHS (Department of Homeland Security)	$1,193,345	0.1%	Rank history: not on the FY2021 list, #82 in FY2022 and not on the FY2024–FY2025 lists; down 14 since FY2022.
97	Diverse Solutions Group Inc. Through Forus Contracting, Inc. Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$1,178,221	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 155 since FY2022.
98	Advanced IT Concepts LLC Top agencies Army (Department of the Army)	$1,159,661	0.1%	Rank history: not on the FY2021–FY2022 lists, #85 in FY2024 and not on the FY2025 list; up 109 since FY2022.
99	Security2000 LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$1,130,206	0.1%	Rank history: #50 in FY2021, #87 in FY2022, #83 in FY2024 and #78 in FY2025; down 12 since FY2022.
100	Corbett Technology Solutions Inc. 4 awardees, including Integrated Security Solutions Inc., Star Asset Security LLC and AFA Protective Systems Inc. Top agencies DISA (Defense Information Systems Agency) Army (Department of the Army) DOJ (Department of Justice)	$1,127,559	0.1%	Rank history: #84 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 7 since FY2022.

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Rankings for the codes under NAICS 56162

Code	Net obligations	Largest contractor
561621 Security Systems Services (except Locksmiths)	$758,334,087	M. C. Dean Inc.
561622 Locksmiths	$9,231,896	Citizen Contracting Group 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 $804 million 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 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 56162 contractors in FY2023?

1. M. C. Dean Inc. ($91.8M), 2. Securitas AB ($50.5M), 3. Johnson Controls Security Solutions LLC ($43.4M), 4. Serco Inc ($40.1M), 5. Omniplex World Services Corp ($34.3M), 6. CACI International Inc. ($28.5M), 7. Serco North America (Holdings) Inc ($25.3M), 8. Xator LLC ($22.8M), 9. Johnson Controls Industries ($19.8M), 10. The Chenega Corporation ($16.8M).

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