Top 100 Contractors in NAICS 561621: Security Systems Services (except Locksmiths), Aug 2025–Jul 2026

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	M.c. Dean, Inc. 2 awardees Top agencies DOT (Department of Transportation) DOD (Department of Defense) AOUSC (Administrative Office of the U.S. Courts)	$122,456,350	15.5%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since Aug 2024–Jul 2025.
2	Serco Inc Top agencies Navy (Department of the Navy)	$102,652,451	13.0%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since Aug 2024–Jul 2025.
3	Securitas Critical Infrastructure Services Inc. 2 awardees, including Paragon Systems Inc. Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture)	$54,803,009	6.9%	Rank history: not on the FY2021–FY2023 lists, #8 in FY2024 and #3 in FY2025; unchanged since Aug 2024–Jul 2025.
4	CACI International Inc. 3 awardees, including Caci, Inc. - Federal Top agencies USAF (Department of the Air Force)	$36,289,386	4.6%	Rank history: #5 in FY2021, #7 in FY2022, #6 in FY2023, #7 in FY2024 and #5 in FY2025; up 1 since Aug 2024–Jul 2025.
5	Johnson Controls Federal Systems, LLC Through Johnson Controls Building Automation Systems, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOJ (Department of Justice)	$28,654,311	3.6%	Rank history: not on the FY2021–FY2024 lists and #8 in FY2025; new, not ranked in Aug 2024–Jul 2025.
6	Johnson Controls Security Solutions LLC Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice) AOUSC (Administrative Office of the U.S. Courts)	$22,896,728	2.9%	Rank history: #2 in FY2021, #3 in FY2022, #3 in FY2023, #6 in FY2024 and #6 in FY2025; up 1 since Aug 2024–Jul 2025.
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)	$21,045,486	2.7%	Rank history: not on the FY2021 list, #51 in FY2022, #31 in FY2023, #19 in FY2024 and #7 in FY2025; up 2 since Aug 2024–Jul 2025.
8	Constellis, LLC Through Triple Canopy Inc. Top agencies DHS (Department of Homeland Security)	$15,584,686	2.0%	Rank history: not on the FY2021–FY2024 lists and #9 in FY2025; new, not ranked in Aug 2024–Jul 2025.
9	General Dynamics Corporation Through General Dynamics Mission Systems, Inc. Top agencies Navy (Department of the Navy)	$14,291,569	1.8%	Rank history: not on the FY2021–FY2023 lists, #3 in FY2024 and #4 in FY2025; down 5 since Aug 2024–Jul 2025.
10	Tyco Fire Products LP 4 awardees, including Johnson Controls Fire Protection LP, Johnson Controls, Inc. and Johnson Controls Building Solutions, LLC Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) USAF (Department of the Air Force)	$11,916,539	1.5%	Rank history: not on the FY2021–FY2023 lists, #18 in FY2024 and #10 in FY2025; up 4 since Aug 2024–Jul 2025.
11	The Chenega Corporation 5 awardees, including Chenega Integrated Security Solutions, LLC, Chenega Sentinel 360, LLC and Chenega Security International, LLC Top agencies SEC (Securities and Exchange Commission) MDA (DOD Missile Defense Agency) DISA (Defense Information Systems Agency)	$10,870,050	1.4%	Rank history: #6 in FY2021, #10 in FY2022, #10 in FY2023, not on the FY2024 list and #11 in FY2025; new, not ranked in Aug 2024–Jul 2025.
12	Birdi Systems, Inc. Top agencies HHS (Department of Health and Human Services)	$10,756,755	1.4%	Rank history: not on the FY2021–FY2023 lists, #10 in FY2024 and #13 in FY2025; up 3 since Aug 2024–Jul 2025.
13	Media Plumbing & Heating Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$10,122,084	1.3%	Rank history: #14 in FY2021, #14 in FY2022, #21 in FY2023, #17 in FY2024 and #14 in FY2025; up 4 since Aug 2024–Jul 2025.
14	Olgoonik Corporation Through Olgoonik Solutions LLC Top agencies DOE (Department of Energy)	$9,484,754	1.2%	Rank history: #26 in FY2021, #42 in FY2022, #33 in FY2023, not on the FY2024 list and #16 in FY2025; new, not ranked in Aug 2024–Jul 2025.
15	Indyne, Inc. 2 awardees Top agencies USAF (Department of the Air Force)	$8,501,360	1.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
16	Scdatacom LLC Top agencies DOJ (Department of Justice) VA (Department of Veterans Affairs) DISA (Defense Information Systems Agency)	$7,199,166	0.9%	Rank history: #72 in FY2021, #23 in FY2022, #22 in FY2023, #13 in FY2024 and #12 in FY2025; down 6 since Aug 2024–Jul 2025.
17	Evergreen Fire Alarms LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$6,695,096	0.8%	Rank history: #11 in FY2021, #31 in FY2022, #20 in FY2023, #30 in FY2024 and #17 in FY2025; up 6 since Aug 2024–Jul 2025.
18	Smiths Detection Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice) DHS (Department of Homeland Security)	$6,404,527	0.8%	Rank history: not on the FY2021–FY2023 lists, #41 in FY2024 and #39 in FY2025; up 39 since Aug 2024–Jul 2025.
19	Akamai Intelligence LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$6,362,525	0.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
20	Advanced Technology Systems Company, Inc. (OF Virginia) Top agencies USAF (Department of the Air Force)	$5,889,182	0.7%	Rank history: #37 in FY2021, #2 in FY2022, #14 in FY2023, #4 in FY2024 and not on the FY2025 list; down 9 since Aug 2024–Jul 2025.
21	HQE Systems Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$5,878,457	0.7%	Rank history: not on the FY2021–FY2023 lists, #51 in FY2024 and #50 in FY2025; up 19 since Aug 2024–Jul 2025.
22	Versar, Inc. Through Versar Security Systems, LLC Top agencies AOUSC (Administrative Office of the U.S. Courts) GAO (Government Accountability Office) DOT (Department of Transportation)	$5,833,847	0.7%	Rank history: not on the FY2021–FY2024 lists and #20 in FY2025; new, not ranked in Aug 2024–Jul 2025.
23	Electripro, Inc. Top agencies DHS (Department of Homeland Security)	$4,662,374	0.6%	Rank history: not on the FY2021 list, #18 in FY2022, #36 in FY2023, not on the FY2024 list and #34 in FY2025; up 337 since Aug 2024–Jul 2025.
24	Hurtvet Subcontracting LLC Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior) Army (Department of the Army)	$4,630,709	0.6%	Rank history: #18 in FY2021, #27 in FY2022, #16 in FY2023, #24 in FY2024 and #27 in FY2025; up 6 since Aug 2024–Jul 2025.
25	Veterans Fire and Life Safety Corporation Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$4,446,710	0.6%	Rank history: not on the FY2021 list, #50 in FY2022, not on the FY2023 list, #47 in FY2024 and #28 in FY2025; up 11 since Aug 2024–Jul 2025.
26	Integrated Security Technologies Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) Army (Department of the Army)	$4,413,302	0.6%	Rank history: #35 in FY2021, #62 in FY2022, #39 in FY2023, #34 in FY2024 and #60 in FY2025; up 29 since Aug 2024–Jul 2025.
27	Global Resource Solutions Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Treasury (Department of the Treasury)	$4,261,236	0.5%	Rank history: #40 in FY2021, #43 in FY2022, #32 in FY2023, #36 in FY2024 and #26 in FY2025; up 2 since Aug 2024–Jul 2025.
28	Ukpeagvik Inupiat Corporation Through Bowhead Protection and Security Services, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$4,129,316	0.5%	Rank history: not on the FY2021–FY2024 lists and #33 in FY2025; new, not ranked in Aug 2024–Jul 2025.
29	Trofholz Technologies, Inc. Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$3,773,107	0.5%	Rank history: #19 in FY2021, #15 in FY2022, #15 in FY2023, #22 in FY2024 and #24 in FY2025; down 9 since Aug 2024–Jul 2025.
30	Warfeather, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army) VA (Department of Veterans Affairs)	$3,745,921	0.5%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023, #50 in FY2024 and #25 in FY2025; up 8 since Aug 2024–Jul 2025.
31	Echelon Services, LLC Top agencies DOD (Department of Defense) HUD (Department of Housing and Urban Development)	$3,585,752	0.5%	Rank history: #69 in FY2021, #92 in FY2022, #54 in FY2023, #49 in FY2024 and #32 in FY2025; up 12 since Aug 2024–Jul 2025.
32	Systems Northwest, LLC Top agencies HHS (Department of Health and Human Services)	$3,298,794	0.4%	Rank history: #56 in FY2021, #78 in FY2022, #61 in FY2023, #53 in FY2024 and #44 in FY2025; up 50 since Aug 2024–Jul 2025.
33	Total-Evergreen JV LLC Top agencies Army (Department of the Army)	$3,108,773	0.4%	Rank history: not on the FY2021 list, #45 in FY2022, #43 in FY2023, #38 in FY2024 and #42 in FY2025; up 6 since Aug 2024–Jul 2025.
34	KBR Wyle Services LLC 2 awardees Top agencies DOT (Department of Transportation)	$3,105,895	0.4%	Rank history: not on the FY2021–FY2023 lists, #20 in FY2024 and #15 in FY2025; down 21 since Aug 2024–Jul 2025.
35	Low Voltage Wiring Ltd Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,008,115	0.4%	Rank history: #20 in FY2021, not on the FY2022 list, #37 in FY2023, not on the FY2024 list and #36 in FY2025; up 7 since Aug 2024–Jul 2025.
36	Gonzales Consulting Services Inc Top agencies SSA (Social Security Administration)	$2,996,619	0.4%	Rank history: not on the FY2021–FY2023 lists, #42 in FY2024 and #38 in FY2025; new, not ranked in Aug 2024–Jul 2025.
37	Fortem Technologies Inc. Top agencies Navy (Department of the Navy)	$2,987,131	0.4%	Rank history: not on the FY2021–FY2025 lists; up 281 since Aug 2024–Jul 2025.
38	Xtec, Incorporated Top agencies USAGM (US Agency for Global Media)	$2,908,858	0.4%	Rank history: not on the FY2021–FY2024 lists and #40 in FY2025; up 89 since Aug 2024–Jul 2025.
39	Soos Holding Company LLC 2 awardees, including Kcorp Reliance Company, Inc. and Yukon Fire Protection Services, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$2,706,629	0.3%	Rank history: not on the FY2021–FY2025 lists; up 433 since Aug 2024–Jul 2025.
40	Digital Air Control, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$2,652,965	0.3%	Rank history: #94 in FY2021, not on the FY2022–FY2024 lists and #31 in FY2025; up 52 since Aug 2024–Jul 2025.
41	Ginisis Group Inc. Top agencies USAF (Department of the Air Force)	$2,477,765	0.3%	Rank history: not on the FY2021–FY2023 lists, #77 in FY2024 and #45 in FY2025; up 19 since Aug 2024–Jul 2025.
42	Seneca Federal Solutions, LLC Top agencies DHA (Defense Health Agency)	$2,382,281	0.3%	Rank history: not on the FY2021–FY2024 lists and #52 in FY2025; up 42 since Aug 2024–Jul 2025.
43	SRC Inc. Through Srctec, LLC Top agencies USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service)	$2,378,352	0.3%	Rank history: #9 in FY2021, #20 in FY2022, #17 in FY2023, #100 in FY2024 and #22 in FY2025; new, not ranked in Aug 2024–Jul 2025.
44	Monaco Enterprises, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$2,362,351	0.3%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023, not on the FY2024 list and #64 in FY2025; up 46 since Aug 2024–Jul 2025.
45	Cynergy Professional Systems LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USAF (Department of the Air Force)	$2,284,367	0.3%	Rank history: #70 in FY2021, #33 in FY2022, #57 in FY2023, #69 in FY2024 and #43 in FY2025; up 3 since Aug 2024–Jul 2025.
46	Bristol Bay Native Corporation 2 awardees, including Vista Defense Technologies, LLC and Gc&E Systems Group, LLC Top agencies DHA (Defense Health Agency) DOE (Department of Energy)	$2,130,806	0.3%	Rank history: not on the FY2021–FY2024 lists and #30 in FY2025; new, not ranked in Aug 2024–Jul 2025.
47	Digitronics, Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) VA (Department of Veterans Affairs)	$2,121,902	0.3%	Rank history: not on the FY2021–FY2024 lists and #55 in FY2025; up 79 since Aug 2024–Jul 2025.
48	Professionals HIR LLC Top agencies Navy (Department of the Navy)	$2,072,303	0.3%	Rank history: #22 in FY2021, #88 in FY2022, #100 in FY2023, #59 in FY2024 and #57 in FY2025; up 26 since Aug 2024–Jul 2025.
49	Siemens Industry Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DHA (Defense Health Agency)	$2,056,002	0.3%	Rank history: not on the FY2021–FY2024 lists and #37 in FY2025; new, not ranked in Aug 2024–Jul 2025.
50	Aktarius LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,022,003	0.3%	Rank history: not on the FY2021–FY2023 lists, #66 in FY2024 and #48 in FY2025; down 5 since Aug 2024–Jul 2025.
51	Afognak Native Corporation 2 awardees, including Shields Point LLC and Red Peak Technical Services, LLC Top agencies DHS (Department of Homeland Security)	$2,014,783	0.3%	Rank history: #49 in FY2021, #57 in FY2022, not on the FY2023–FY2024 lists and #29 in FY2025; new, not ranked in Aug 2024–Jul 2025.
52	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)	$1,976,903	0.2%	Rank history: not on the FY2021–FY2023 lists, #46 in FY2024 and #61 in FY2025; down 8 since Aug 2024–Jul 2025.
53	Itm4G LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHS (Department of Homeland Security)	$1,878,830	0.2%	Rank history: #43 in FY2021, #22 in FY2022, #24 in FY2023, #26 in FY2024 and #21 in FY2025; down 31 since Aug 2024–Jul 2025.
54	Open Systems Technologies Corporation Top agencies Army (Department of the Army)	$1,875,346	0.2%	Rank history: not on the FY2021–FY2024 lists and #47 in FY2025; up 158 since Aug 2024–Jul 2025.
55	Falken Industries LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$1,863,530	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
56	V2X, Inc. 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)	$1,837,308	0.2%	Rank history: not on the FY2021–FY2023 lists, #27 in FY2024 and #41 in FY2025; down 28 since Aug 2024–Jul 2025.
57	Intellimar Inc. 2 awardees, including Concentric Security LLC Top agencies Smithsonian (Smithsonian Institution) USAF (Department of the Air Force) DOI (Department of the Interior)	$1,667,291	0.2%	Rank history: #99 in FY2021, #86 in FY2022, #63 in FY2023, not on the FY2024 list and #58 in FY2025; up 171 since Aug 2024–Jul 2025.
58	M3T Corporation Top agencies Army (Department of the Army) Navy (Department of the Navy) USDA (Department of Agriculture)	$1,432,614	0.2%	Rank history: #88 in FY2021, #89 in FY2022, not on the FY2023 list, #74 in FY2024 and #68 in FY2025; up 8 since Aug 2024–Jul 2025.
59	Kastle Systems LLC Top agencies SBA (Small Business Administration) Treasury (Department of the Treasury) CFTC (Commodity Futures Trading Commission)	$1,412,772	0.2%	Rank history: #36 in FY2021, #47 in FY2022, #52 in FY2023, #56 in FY2024 and #71 in FY2025; up 18 since Aug 2024–Jul 2025.
60	E-Mc Electrical, Inc. Top agencies GSA (General Services Administration)	$1,352,613	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
61	J2 Associates, LLC Top agencies DOT (Department of Transportation) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$1,323,314	0.2%	Rank history: #74 in FY2021, #64 in FY2022, #99 in FY2023, #89 in FY2024 and #59 in FY2025; up 12 since Aug 2024–Jul 2025.
62	Pamunkey Indian Enterprises - Professional Services (Pie-Ps) Top agencies Army (Department of the Army)	$1,313,187	0.2%	Rank history: not on the FY2021–FY2025 lists; up 57 since Aug 2024–Jul 2025.
63	Drake Consulting LLC Top agencies USAF (Department of the Air Force)	$1,300,771	0.2%	Rank history: not on the FY2021–FY2024 lists and #54 in FY2025; up 45 since Aug 2024–Jul 2025.
64	Onerain Incorporated Top agencies DOI (Department of the Interior)	$1,298,725	0.2%	Rank history: #67 in FY2021, #81 in FY2022, #92 in FY2023, #93 in FY2024 and #66 in FY2025; up 11 since Aug 2024–Jul 2025.
65	Sernotti Electrical Services LLC Top agencies Navy (Department of the Navy)	$1,283,826	0.2%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2023, #63 in FY2024 and #51 in FY2025; down 19 since Aug 2024–Jul 2025.
66	Alaka`i Services Group Inc. Top agencies Navy (Department of the Navy)	$1,233,663	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
67	Rock Creek Logistics, Technology, & Management Business Solutions LLC Top agencies Army (Department of the Army)	$1,232,290	0.2%	Rank history: not on the FY2021–FY2023 lists, #84 in FY2024 and not on the FY2025 list; up 4 since Aug 2024–Jul 2025.
68	The Whitestone Group, Inc. Top agencies Navy (Department of the Navy)	$1,221,974	0.2%	Rank history: not on the FY2021–FY2024 lists and #69 in FY2025; up 8 since Aug 2024–Jul 2025.
69	Kaiva Corporation Through Kaiva Services, LLC Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$1,205,870	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
70	Cmn, LLC Top agencies DHS (Department of Homeland Security)	$1,174,286	0.1%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2023, #79 in FY2024 and #35 in FY2025; down 37 since Aug 2024–Jul 2025.
71	Signet Technologies, Inc. Top agencies DOI (Department of the Interior) Peace Corps OPM (Office of Personnel Management)	$1,158,811	0.1%	Rank history: #38 in FY2021, #60 in FY2022, #30 in FY2023, #37 in FY2024 and #65 in FY2025; down 30 since Aug 2024–Jul 2025.
72	Wingmann LLC Top agencies USAF (Department of the Air Force)	$1,158,098	0.1%	Rank history: not on the FY2021–FY2024 lists and #82 in FY2025; new, not ranked in Aug 2024–Jul 2025.
73	Communications Resource Inc. Top agencies Commerce (Department of Commerce) USDA (Department of Agriculture) CSOSA (Court Services and Offender Supervision Agency)	$1,085,808	0.1%	Rank history: #47 in FY2021, #46 in FY2022, not on the FY2023 list, #54 in FY2024 and #95 in FY2025; down 17 since Aug 2024–Jul 2025.
74	Tactica Solutions LLC Top agencies Army (Department of the Army)	$1,081,887	0.1%	Rank history: not on the FY2021–FY2024 lists and #77 in FY2025; up 14 since Aug 2024–Jul 2025.
75	Ldia Holdings, LLC Top agencies USAF (Department of the Air Force)	$1,079,210	0.1%	Rank history: not on the FY2021 list, #59 in FY2022, #93 in FY2023, #73 in FY2024 and #62 in FY2025; down 25 since Aug 2024–Jul 2025.
76	Integrity Protection Systems LLC Top agencies VA (Department of Veterans Affairs)	$1,045,208	0.1%	Rank history: #75 in FY2021, not on the FY2022–FY2024 lists and #100 in FY2025; up 27 since Aug 2024–Jul 2025.
77	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, not on the FY2024 list and #81 in FY2025; new, not ranked in Aug 2024–Jul 2025.
78	F-Concepts, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,020,086	0.1%	Rank history: #93 in FY2021, #82 in FY2022, not on the FY2023 list, #72 in FY2024 and #83 in FY2025; up 5 since Aug 2024–Jul 2025.
79	Ma Impianti S.R.L. Top agencies Army (Department of the Army)	$1,016,188	0.1%	Rank history: #85 in FY2021, #96 in FY2022, #53 in FY2023, not on the FY2024 list and #91 in FY2025; up 37 since Aug 2024–Jul 2025.
80	JH Elektroanlagen GMBH & Co. KG Top agencies Army (Department of the Army)	$996,144	0.1%	Rank history: not on the FY2021–FY2024 lists and #76 in FY2025; up 7 since Aug 2024–Jul 2025.
81	Trilogy Secured Services, L.l.c Top agencies DHS (Department of Homeland Security) DECA (Defense Commissary Agency) Army (Department of the Army)	$995,666	0.1%	Rank history: #58 in FY2021, #68 in FY2022, #19 in FY2023, #28 in FY2024 and #85 in FY2025; down 28 since Aug 2024–Jul 2025.
82	Dacama, LLC Top agencies Army (Department of the Army)	$974,650	0.1%	Rank history: not on the FY2021–FY2024 lists and #84 in FY2025; new, not ranked in Aug 2024–Jul 2025.
83	Active Security Consulting LLC Top agencies DHS (Department of Homeland Security) DHA (Defense Health Agency)	$925,175	0.1%	Rank history: not on the FY2021–FY2025 lists; up 100 since Aug 2024–Jul 2025.
84	Assa Abloy Global Solutions, Inc. Top agencies DHS (Department of Homeland Security)	$914,322	0.1%	Rank history: not on the FY2021–FY2024 lists and #88 in FY2025; new, not ranked in Aug 2024–Jul 2025.
85	The Fields Group, LLC Top agencies FTC (Federal Trade Commission)	$909,923	0.1%	Rank history: not on the FY2021–FY2024 lists and #73 in FY2025; up 22 since Aug 2024–Jul 2025.
86	RF Technologies Inc. Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$886,988	0.1%	Rank history: not on the FY2021–FY2024 lists and #96 in FY2025; up 323 since Aug 2024–Jul 2025.
87	Golden Tech Systems Inc Top agencies DOE (Department of Energy)	$863,767	0.1%	Rank history: not on the FY2021–FY2025 lists; up 241 since Aug 2024–Jul 2025.
88	Agile1Tech Corporation Top agencies Navy (Department of the Navy)	$845,597	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
89	AES Systems Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$843,768	0.1%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023, not on the FY2024 list and #56 in FY2025; down 31 since Aug 2024–Jul 2025.
90	Everon LLC 4 awardees, including Apex Integrated Security Solutions, LLC and ADT LLC Top agencies VA (Department of Veterans Affairs) Treasury (Department of the Treasury) USAF (Department of the Air Force)	$841,669	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
91	Security2000 LLC Top agencies Army (Department of the Army)	$811,721	0.1%	Rank history: #50 in FY2021, #85 in FY2022, #97 in FY2023, #83 in FY2024 and #78 in FY2025; down 27 since Aug 2024–Jul 2025.
92	Condortech Services, Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) RRB (Railroad Retirement Board)	$807,681	0.1%	Rank history: not on the FY2021–FY2022 lists, #66 in FY2023, #65 in FY2024 and #80 in FY2025; down 43 since Aug 2024–Jul 2025.
93	B W Electric, Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$804,260	0.1%	Rank history: not on the FY2021–FY2024 lists and #97 in FY2025; up 216 since Aug 2024–Jul 2025.
94	Scott Total Security Limited Top agencies USAF (Department of the Air Force)	$789,478	0.1%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; up 7 since Aug 2024–Jul 2025.
95	Sentrillion Corporation Top agencies USAF (Department of the Air Force)	$784,304	0.1%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2023, not on the FY2024 list and #79 in FY2025; up 72 since Aug 2024–Jul 2025.
96	KR Contracting Inc. Top agencies OPM (Office of Personnel Management)	$778,916	0.1%	Rank history: #44 in FY2021, #48 in FY2022, #47 in FY2023, #81 in FY2024 and #49 in FY2025; down 15 since Aug 2024–Jul 2025.
97	Bold Technologies Ltd. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$749,056	0.1%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023, not on the FY2024 list and #98 in FY2025; up 3 since Aug 2024–Jul 2025.
98	GSC Systems Inc. Top agencies USAF (Department of the Air Force)	$737,535	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
99	Oakum Group, LLC Top agencies VA (Department of Veterans Affairs)	$697,903	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
100	Dal Media Solutions Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) Navy (Department of the Navy)	$695,628	0.1%	Rank history: not on the FY2021–FY2024 lists and #93 in FY2025; up 24 since Aug 2024–Jul 2025.

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 $792 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
• Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
• Rank changes compare with Aug 2024–Jul 2025. "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.
• Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers