Top 100 Contractors in NAICS 561621: Security Systems Services (except Locksmiths), FY2025

Name: Top 100 Contractors in NAICS 561621: Security Systems Services (except Locksmiths), FY2025
Creator: GovTribe

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

The top 10 won 57% of FY2025 NAICS 561621 contract dollars

Contract obligations: $781,450,430 Net of deobligations, by contracts coded NAICS 561621
Contractors: 896 Parent companies with an obligation
Largest contractor: M.c. Dean, Inc. $120 million, 14.7% 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. Top agencies DOD (Department of Defense) AOUSC (Administrative Office of the U.S. Courts) DOT (Department of Transportation)	$120,431,642	14.7%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2024; unchanged since FY2024.
2	Serco Inc Top agencies Navy (Department of the Navy)	$103,619,439	12.6%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2023 and #2 in FY2024; unchanged since FY2024.
3	Securitas Electronic Security Inc. 2 awardees, including Paragon Systems Inc. Top agencies DHS (Department of Homeland Security) Treasury (Department of the Treasury) USDA (Department of Agriculture)	$58,041,378	7.1%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2024; up 5 since FY2024.
4	General Dynamics Corporation Through General Dynamics Mission Systems, Inc. Top agencies Navy (Department of the Navy)	$44,600,585	5.4%	Rank history: not on the FY2021–FY2023 lists and #3 in FY2024; down 1 since FY2024.
5	CACI International Inc. 3 awardees, including Caci, Inc. - Federal Top agencies USAF (Department of the Air Force)	$36,497,761	4.4%	Rank history: #5 in FY2021, #7 in FY2022, #6 in FY2023 and #7 in FY2024; up 2 since FY2024.
6	Johnson Controls Security Solutions LLC Top agencies DHS (Department of Homeland Security) AOUSC (Administrative Office of the U.S. Courts) Treasury (Department of the Treasury)	$26,825,863	3.3%	Rank history: #2 in FY2021, #3 in FY2022, #3 in FY2023 and #6 in FY2024; unchanged since FY2024.
7	Parsons Corporation 4 awardees, including Xator LLC, Ptsi Managed Services Inc. and Williams Electric Co Inc. Top agencies USAF (Department of the Air Force) Smithsonian (Smithsonian Institution) Army (Department of the Army)	$23,836,999	2.9%	Rank history: not on the FY2021 list, #51 in FY2022, #31 in FY2023 and #19 in FY2024; up 12 since FY2024.
8	Johnson Controls Building Automation Systems, LLC 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOJ (Department of Justice)	$20,531,151	2.5%	Rank history: #24 in FY2021, not on the FY2022–FY2023 lists and #9 in FY2024; up 1 since FY2024.
9	Triple Canopy Inc. Top agencies DHS (Department of Homeland Security)	$15,361,183	1.9%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2024; up 3 since FY2024.
10	Johnson Controls Inc 2 awardees, including Johnson Controls Fire Protection LP Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) USDA (Department of Agriculture)	$14,684,204	1.8%	Rank history: not on the FY2021–FY2023 lists and #18 in FY2024; up 8 since FY2024.
11	Scdatacom LLC Top agencies DOJ (Department of Justice) VA (Department of Veterans Affairs) DISA (Defense Information Systems Agency)	$12,098,301	1.5%	Rank history: #72 in FY2021, #23 in FY2022, #22 in FY2023 and #13 in FY2024; up 2 since FY2024.
12	Chenega Integrated Security Solutions, LLC Top agencies SEC (Securities and Exchange Commission) MDA (DOD Missile Defense Agency)	$10,720,060	1.3%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2024; up 3 since FY2024.
13	Birdi Systems, Inc. Top agencies HHS (Department of Health and Human Services)	$10,629,387	1.3%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2024; down 3 since FY2024.
14	Media Plumbing & Heating Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$9,205,386	1.1%	Rank history: #14 in FY2021, #14 in FY2022, #21 in FY2023 and #17 in FY2024; up 3 since FY2024.
15	KBR Wyle Services LLC 2 awardees Top agencies DOT (Department of Transportation) AOUSC (Administrative Office of the U.S. Courts)	$8,925,843	1.1%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2024; up 5 since FY2024.
16	Olgoonik Solutions LLC Top agencies DOE (Department of Energy)	$8,306,428	1.0%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2024; up 23 since FY2024.
17	Evergreen Fire Alarms LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$6,580,144	0.8%	Rank history: #11 in FY2021, #31 in FY2022, #20 in FY2023 and #30 in FY2024; up 13 since FY2024.
18	Indyne, Inc. 2 awardees Top agencies USAF (Department of the Air Force)	$6,442,495	0.8%	Rank history: #15 in FY2021, #19 in FY2022, #26 in FY2023 and #21 in FY2024; up 3 since FY2024.
19	Electronic Systems Services Inc. Top agencies Treasury (Department of the Treasury)	$6,019,472	0.7%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2024; up 4 since FY2024.
20	Versar Security Systems, LLC Top agencies GAO (Government Accountability Office) AOUSC (Administrative Office of the U.S. Courts) DOT (Department of Transportation)	$5,300,124	0.6%	Rank history: not on the FY2021 list, #21 in FY2022, #25 in FY2023 and #11 in FY2024; down 9 since FY2024.
21	Itm4G LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$5,287,407	0.6%	Rank history: #43 in FY2021, #22 in FY2022, #24 in FY2023 and #26 in FY2024; up 5 since FY2024.
22	Srctec, LLC Top agencies USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service)	$5,153,024	0.6%	Rank history: #41 in FY2021, not on the FY2022–FY2023 lists and #25 in FY2024; up 3 since FY2024.
23	Firelake Construction Inc 2 awardees Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$5,015,470	0.6%	Rank history: #31 in FY2021, #41 in FY2022, #38 in FY2023 and #29 in FY2024; up 6 since FY2024.
24	Trofholz Technologies, Inc. Top agencies USSOCOM (United States Special Operations Command) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$4,512,675	0.6%	Rank history: #19 in FY2021, #15 in FY2022, #15 in FY2023 and #22 in FY2024; down 2 since FY2024.
25	Warfeather, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army) VA (Department of Veterans Affairs)	$4,315,520	0.5%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023 and #50 in FY2024; up 25 since FY2024.
26	Global Resource Solutions Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$4,302,190	0.5%	Rank history: #40 in FY2021, #43 in FY2022, #32 in FY2023 and #36 in FY2024; up 10 since FY2024.
27	Hurtvet Subcontracting LLC Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior) Army (Department of the Army)	$4,118,434	0.5%	Rank history: #18 in FY2021, #27 in FY2022, #16 in FY2023 and #24 in FY2024; down 3 since FY2024.
28	Veterans Fire and Life Safety Corporation Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$3,872,655	0.5%	Rank history: not on the FY2021 list, #50 in FY2022, not on the FY2023 list and #47 in FY2024; up 19 since FY2024.
29	Vista Defense Technologies, LLC Top agencies DHA (Defense Health Agency)	$3,612,928	0.4%	Rank history: #25 in FY2021, #36 in FY2022, #40 in FY2023 and #32 in FY2024; up 3 since FY2024.
30	Digital Air Control, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$3,426,141	0.4%	Rank history: #94 in FY2021 and not on the FY2022–FY2024 lists; returned.
31	Echelon Services, LLC Top agencies HUD (Department of Housing and Urban Development) DOD (Department of Defense)	$3,182,179	0.4%	Rank history: #69 in FY2021, #92 in FY2022, #54 in FY2023 and #49 in FY2024; up 18 since FY2024.
32	Bowhead Protection & Security Services LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$3,177,556	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
33	Electripro, Inc. Top agencies DHS (Department of Homeland Security)	$3,058,567	0.4%	Rank history: not on the FY2021 list, #18 in FY2022, #36 in FY2023 and not on the FY2024 list; returned.
34	Cmn, LLC Top agencies DHS (Department of Homeland Security)	$2,967,000	0.4%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2023 and #79 in FY2024; up 45 since FY2024.
35	Low Voltage Wiring Ltd Top agencies USAF (Department of the Air Force) Army (Department of the Army) Treasury (Department of the Treasury)	$2,915,071	0.4%	Rank history: #20 in FY2021, not on the FY2022 list, #37 in FY2023 and not on the FY2024 list; up 85 since FY2024.
36	Siemens Industry Inc. Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) Army (Department of the Army)	$2,904,876	0.4%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2024; up 28 since FY2024.
37	Gonzales Consulting Services Inc Top agencies SSA (Social Security Administration)	$2,811,316	0.3%	Rank history: not on the FY2021–FY2023 lists and #42 in FY2024; up 5 since FY2024.
38	Smiths Detection Inc. Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security)	$2,808,851	0.3%	Rank history: not on the FY2021–FY2023 lists and #41 in FY2024; up 3 since FY2024.
39	Xtec, Incorporated Top agencies USAGM (US Agency for Global Media)	$2,804,964	0.3%	Rank history: not on the FY2021–FY2024 lists; up 116 since FY2024.
40	Red Peak Technical Services, LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security)	$2,775,112	0.3%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2024; up 17 since FY2024.
41	V2X, Inc. Through Advantor Systems II LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service)	$2,722,579	0.3%	Rank history: not on the FY2021–FY2023 lists and #27 in FY2024; down 14 since FY2024.
42	Total-Evergreen JV LLC Top agencies Army (Department of the Army)	$2,673,336	0.3%	Rank history: not on the FY2021 list, #45 in FY2022, #43 in FY2023 and #38 in FY2024; down 4 since FY2024.
43	Cynergy Professional Systems LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USAF (Department of the Air Force)	$2,505,506	0.3%	Rank history: #70 in FY2021, #33 in FY2022, #57 in FY2023 and #69 in FY2024; up 26 since FY2024.
44	Systems Northwest, LLC Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$2,468,650	0.3%	Rank history: #56 in FY2021, #78 in FY2022, #61 in FY2023 and #53 in FY2024; up 9 since FY2024.
45	Ginisis Group Inc. Top agencies USAF (Department of the Air Force)	$2,231,952	0.3%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2024; up 32 since FY2024.
46	Lbyd Federal, LLC Top agencies OSD (Office of the Secretary of Defense)	$1,912,575	0.2%	Rank history: #45 in FY2021, #79 in FY2022, #45 in FY2023 and #48 in FY2024; up 2 since FY2024.
47	Open Systems Technologies Corporation Top agencies Army (Department of the Army)	$1,875,346	0.2%	Rank history: not on the FY2021–FY2024 lists; up 211 since FY2024.
48	Aktarius LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,847,747	0.2%	Rank history: not on the FY2021–FY2023 lists and #66 in FY2024; up 18 since FY2024.
49	KR Contracting Inc. Top agencies OPM (Office of Personnel Management)	$1,845,505	0.2%	Rank history: #44 in FY2021, #48 in FY2022, #47 in FY2023 and #81 in FY2024; up 32 since FY2024.
50	HQE Systems Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,780,410	0.2%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2024; up 1 since FY2024.
51	Sernotti Electrical Services LLC Top agencies Navy (Department of the Navy)	$1,702,085	0.2%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2023 and #63 in FY2024; up 12 since FY2024.
52	Seneca Federal Solutions, LLC Top agencies DHA (Defense Health Agency)	$1,689,329	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
53	Usmax Corporation Top agencies USAID (US Agency for International Development)	$1,674,748	0.2%	Rank history: #28 in FY2021, #38 in FY2022, #49 in FY2023 and not on the FY2024 list; up 108 since FY2024.
54	Drake Consulting LLC Top agencies USAF (Department of the Air Force)	$1,615,863	0.2%	Rank history: not on the FY2021–FY2024 lists; up 145 since FY2024.
55	Digitronics, Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) DCMA (Defense Contract Management Agency)	$1,610,007	0.2%	Rank history: not on the FY2021–FY2024 lists; up 137 since FY2024.
56	AES Systems Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$1,606,641	0.2%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023 and not on the FY2024 list; up 51 since FY2024.
57	Professionals HIR LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$1,594,887	0.2%	Rank history: #22 in FY2021, #88 in FY2022, #100 in FY2023 and #59 in FY2024; up 2 since FY2024.
58	J2 Associates, LLC Top agencies DOT (Department of Transportation) USAF (Department of the Air Force) USDA (Department of Agriculture)	$1,569,040	0.2%	Rank history: #74 in FY2021, #64 in FY2022, #99 in FY2023 and #89 in FY2024; up 31 since FY2024.
59	Integrated Security Technologies Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$1,565,868	0.2%	Rank history: #35 in FY2021, #62 in FY2022, #39 in FY2023 and #34 in FY2024; down 25 since FY2024.
60	Systems Engineering Services Corporation Through Systems Engineering Inc. Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) NTSB (National Transportation Safety Board)	$1,538,734	0.2%	Rank history: not on the FY2021–FY2023 lists and #46 in FY2024; down 14 since FY2024.
61	Ldia Holdings, LLC Top agencies USAF (Department of the Air Force)	$1,509,717	0.2%	Rank history: not on the FY2021 list, #59 in FY2022, #93 in FY2023 and #73 in FY2024; up 12 since FY2024.
62	Chenega Sentinel 360, LLC Top agencies DISA (Defense Information Systems Agency) EPA (Environmental Protection Agency)	$1,411,553	0.2%	Rank history: not on the FY2021–FY2024 lists; up 228 since FY2024.
63	Monaco Enterprises, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$1,397,725	0.2%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023 and not on the FY2024 list; up 40 since FY2024.
64	Concentric Security LLC Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) DOT (Department of Transportation)	$1,351,917	0.2%	Rank history: not on the FY2021–FY2024 lists; up 84 since FY2024.
65	Signet Technologies, Inc. Top agencies DLA (Defense Logistics Agency) Peace Corps DOI (Department of the Interior)	$1,321,663	0.2%	Rank history: #38 in FY2021, #60 in FY2022, #30 in FY2023 and #37 in FY2024; down 28 since FY2024.
66	Onerain Incorporated Top agencies DOI (Department of the Interior)	$1,254,151	0.2%	Rank history: #67 in FY2021, #81 in FY2022, #92 in FY2023 and #93 in FY2024; up 27 since FY2024.
67	Optimum Low Voltage LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DOI (Department of the Interior)	$1,220,423	0.1%	Rank history: not on the FY2021–FY2024 lists; up 59 since FY2024.
68	M3T Corporation Top agencies Army (Department of the Army) Navy (Department of the Navy) USDA (Department of Agriculture)	$1,194,201	0.1%	Rank history: #88 in FY2021, #89 in FY2022, not on the FY2023 list and #74 in FY2024; up 6 since FY2024.
69	The Whitestone Group, Inc. Top agencies Navy (Department of the Navy)	$1,189,843	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
70	Corelogix Consulting Inc. Top agencies DHS (Department of Homeland Security)	$1,187,152	0.1%	Rank history: #77 in FY2021, #16 in FY2022, #34 in FY2023 and #91 in FY2024; up 21 since FY2024.
71	Kastle Systems LLC Top agencies SBA (Small Business Administration) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$1,155,239	0.1%	Rank history: #36 in FY2021, #47 in FY2022, #52 in FY2023 and #56 in FY2024; down 15 since FY2024.
72	Johnsondanforth, Inc. Top agencies VA (Department of Veterans Affairs)	$1,106,983	0.1%	Rank history: #52 in FY2021, #74 in FY2022, #82 in FY2023 and #94 in FY2024; up 22 since FY2024.
73	The Fields Group, LLC Top agencies FTC (Federal Trade Commission)	$1,064,781	0.1%	Rank history: not on the FY2021–FY2024 lists; up 56 since FY2024.
74	Applied Security Technologies Inc. Top agencies DOS (Department of State)	$1,060,664	0.1%	Rank history: not on the FY2021–FY2023 lists and #70 in FY2024; down 4 since FY2024.
75	Kituwah Services, LLC Top agencies USDA (Department of Agriculture)	$1,054,766	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	JH Elektroanlagen GMBH & Co. KG Top agencies Army (Department of the Army)	$1,050,462	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
77	Tactica Solutions LLC Top agencies Army (Department of the Army)	$1,050,376	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
78	Security2000 LLC Top agencies Army (Department of the Army)	$1,040,036	0.1%	Rank history: #50 in FY2021, #85 in FY2022, #97 in FY2023 and #83 in FY2024; up 5 since FY2024.
79	Sentrillion Corporation Top agencies USAF (Department of the Air Force)	$1,039,845	0.1%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2023 and not on the FY2024 list; up 271 since FY2024.
80	Condortech Services, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$1,035,268	0.1%	Rank history: not on the FY2021–FY2022 lists, #66 in FY2023 and #65 in FY2024; down 15 since FY2024.
81	West Construction, LLC Top agencies Navy (Department of the Navy)	$1,034,898	0.1%	Rank history: not on the FY2021–FY2022 lists, #70 in FY2023 and not on the FY2024 list; returned.
82	Wingmann LLC Top agencies USAF (Department of the Air Force)	$1,030,578	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
83	F-Concepts, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,006,441	0.1%	Rank history: #93 in FY2021, #82 in FY2022, not on the FY2023 list and #72 in FY2024; down 11 since FY2024.
84	Shields Point LLC Top agencies DHS (Department of Homeland Security)	$1,002,988	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
85	Dacama, LLC Top agencies Army (Department of the Army)	$974,650	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
86	Trilogy Secured Services, L.l.c Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice) Army (Department of the Army)	$971,482	0.1%	Rank history: #58 in FY2021, #68 in FY2022, #19 in FY2023 and #28 in FY2024; down 58 since FY2024.
87	T47 International Inc. Top agencies Army (Department of the Army)	$924,452	0.1%	Rank history: not on the FY2021–FY2023 lists and #92 in FY2024; up 5 since FY2024.
88	Nana Regional Corporation Inc. Through Lockwood Hills Federal LLC Top agencies Army (Department of the Army)	$919,871	0.1%	Rank history: not on the FY2021 list, #67 in FY2022, #73 in FY2023 and not on the FY2024 list; up 46 since FY2024.
89	Assa Abloy Global Solutions, Inc. Top agencies DHS (Department of Homeland Security)	$912,322	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
90	Scott Total Security Limited Top agencies USAF (Department of the Air Force)	$890,693	0.1%	Rank history: not on the FY2021–FY2024 lists; up 40 since FY2024.
91	TKH Construction, LLC Top agencies Navy (Department of the Navy)	$888,807	0.1%	Rank history: not on the FY2021–FY2024 lists; up 18 since FY2024.
92	Ma Impianti S.R.L. Top agencies Army (Department of the Army)	$885,584	0.1%	Rank history: #85 in FY2021, #96 in FY2022, #53 in FY2023 and not on the FY2024 list; up 43 since FY2024.
93	Kaiva Services, LLC Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$883,835	0.1%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023 and not on the FY2024 list; up 150 since FY2024.
94	Dal Media Solutions Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$877,419	0.1%	Rank history: not on the FY2021–FY2024 lists; up 112 since FY2024.
95	Secsol Inc. Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$869,503	0.1%	Rank history: #82 in FY2021, #70 in FY2022, not on the FY2023 list and #82 in FY2024; down 13 since FY2024.
96	Communications Resource Inc. Top agencies Commerce (Department of Commerce) USDA (Department of Agriculture)	$864,208	0.1%	Rank history: #47 in FY2021, #46 in FY2022, not on the FY2023 list and #54 in FY2024; down 42 since FY2024.
97	RF Technologies Inc. Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$859,571	0.1%	Rank history: not on the FY2021–FY2024 lists; up 347 since FY2024.
98	B W Electric, Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) USAF (Department of the Air Force)	$824,683	0.1%	Rank history: not on the FY2021–FY2024 lists; up 243 since FY2024.
99	Bold Technologies Ltd. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$824,056	0.1%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023 and not on the FY2024 list; up 17 since FY2024.
100	Talon East Fuel Services LLC Top agencies OSD (Office of the Secretary of Defense)	$776,160	0.1%	Rank history: not on the FY2021–FY2024 lists; new.

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100 of 896 contractors listed here. See the rest on GovTribe.

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 $820 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 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 561621 contractors in FY2025?

1. M.c. Dean, Inc. ($120M), 2. Serco Inc ($104M), 3. Securitas Electronic Security Inc. ($58M), 4. General Dynamics Corporation ($44.6M), 5. CACI International Inc. ($36.5M), 6. Johnson Controls Security Solutions LLC ($26.8M), 7. Parsons Corporation ($23.8M), 8. Johnson Controls Building Automation Systems, LLC ($20.5M), 9. Triple Canopy Inc. ($15.4M), 10. Johnson Controls Inc ($14.7M).

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