Top 100 Contractors in NAICS 56162: Security Systems Services, FY2021

Name: Top 100 Contractors in NAICS 56162: Security Systems Services, FY2021
Creator: GovTribe

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

The top 10 won 48% of FY2021 NAICS 56162 contract dollars

Contract obligations: $674,543,174 Net of deobligations, by contracts coded NAICS 56162 or a code under it
Contractors: 979 Parent companies with an obligation
Largest contractor: M.c. Dean, Inc. $75.1 million, 10.4% 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. Top agencies AOUSC (Administrative Office of the U.S. Courts) WHS (DOD Washington Headquarters Service) DOD (Department of Defense)	$75,056,031	10.4%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; up 2 since FY2020.
2	Johnson Controls Security Solutions LLC 26 awardees, including Johnson Controls Fire Protection LP, Johnson Controls Inc. and Johnson Controls Building Automation Systems, LLC Top agencies DHS (Department of Homeland Security) AOUSC (Administrative Office of the U.S. Courts) Navy (Department of the Navy)	$65,722,807	9.1%	Rank history: #3 in FY2022, #3 in FY2023, #6 in FY2024 and #6 in FY2025; down 1 since FY2020.
3	Serco North America (Holdings) Inc Through Serco Inc. Top agencies Navy (Department of the Navy)	$50,987,913	7.0%	Rank history: #4 in FY2022, #7 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
4	Triple Canopy Inc. Top agencies DHS (Department of Homeland Security)	$41,585,840	5.7%	Rank history: #6 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
5	CACI International Inc. 2 awardees, including Caci Nss, LLC Top agencies USAF (Department of the Air Force)	$34,218,865	4.7%	Rank history: #7 in FY2022, #6 in FY2023, #7 in FY2024 and #5 in FY2025; down 1 since FY2020.
6	The Chenega Corporation 3 awardees, including Chenega Integrated Security Solutions, LLC and Chenega Global Protection, LLC Top agencies DOJ (Department of Justice) Treasury (Department of the Treasury) DHS (Department of Homeland Security)	$19,218,643	2.7%	Rank history: #10 in FY2022, #10 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
7	Xator LLC Top agencies USAF (Department of the Air Force) DOS (Department of State)	$18,684,397	2.6%	Rank history: #5 in FY2022, #8 in FY2023, #31 in FY2024 and not on the FY2025 list; up 1 since FY2020.
8	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)	$14,225,025	2.0%	Rank history: #69 in FY2022, #11 in FY2023, #88 in FY2024 and not on the FY2025 list; up 5 since FY2020.
9	SRC Inc. Through Srctec, LLC Top agencies USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service)	$14,095,440	1.9%	Rank history: #20 in FY2022, #17 in FY2023, #100 in FY2024 and not on the FY2025 list; up 40 since FY2020.
10	Versar Inc. 2 awardees, including Versar Security Systems, LLC Top agencies AOUSC (Administrative Office of the U.S. Courts) DOT (Department of Transportation) GSA (General Services Administration)	$13,994,972	1.9%	Rank history: #12 in FY2022, #12 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
11	Evergreen Fire Alarms LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$11,385,428	1.6%	Rank history: #31 in FY2022, #21 in FY2023, #30 in FY2024 and #17 in FY2025; up 29 since FY2020.
12	Chenega Security International, LLC Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force) Army (Department of the Army)	$10,496,169	1.4%	Rank history: #17 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; up 41 since FY2020.
13	Diversified Protection Corp Top agencies DHS (Department of Homeland Security)	$9,703,394	1.3%	Rank history: #11 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
14	Media Plumbing & Heating Inc. Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) Army (Department of the Army)	$9,604,279	1.3%	Rank history: #14 in FY2022, #22 in FY2023, #17 in FY2024 and #14 in FY2025; down 2 since FY2020.
15	Indyne, Inc. 2 awardees Top agencies USAF (Department of the Air Force)	$7,167,847	1.0%	Rank history: #19 in FY2022, #26 in FY2023, #21 in FY2024 and #18 in FY2025; down 5 since FY2020.
16	Siemens Aktiengesellschaft 4 awardees, including Siemens Industry Inc., Siemens Canada Limited and Siemens Corporation Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) USAF (Department of the Air Force)	$6,622,420	0.9%	Rank history: #13 in FY2022, #28 in FY2023, #45 in FY2024 and not on the FY2025 list; down 2 since FY2020.
17	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security)	$6,545,949	0.9%	Rank history: #26 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
18	Hurtvet Subcontracting, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) Army (Department of the Army)	$6,223,160	0.9%	Rank history: #27 in FY2022, #16 in FY2023, #24 in FY2024 and #27 in FY2025; unchanged since FY2020.
19	Trofholz Technologies, Inc. Top agencies USSOCOM (United States Special Operations Command) VA (Department of Veterans Affairs) DOI (Department of the Interior)	$6,194,231	0.9%	Rank history: #15 in FY2022, #15 in FY2023, #22 in FY2024 and #24 in FY2025; down 4 since FY2020.
20	Low Voltage Wiring Ltd Top agencies USAF (Department of the Air Force) Treasury (Department of the Treasury)	$5,603,161	0.8%	Rank history: not on the FY2022 list, #37 in FY2023, not on the FY2024 list and #35 in FY2025; up 206 since FY2020.
21	Vectrus Systems Corporation 2 awardees, including Advantor Systems II LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$5,409,235	0.7%	Rank history: #61 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; up 47 since FY2020.
22	Professionals HIR LLC Top agencies Commerce (Department of Commerce) Navy (Department of the Navy)	$4,728,682	0.7%	Rank history: #90 in FY2022, not on the FY2023 list, #59 in FY2024 and #57 in FY2025; up 52 since FY2020.
23	Caci Nss, LLC Top agencies USAF (Department of the Air Force)	$4,598,884	0.6%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
24	Johnson Controls Building Automation Systems, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$4,515,854	0.6%	Rank history: not on the FY2022–FY2023 lists, #9 in FY2024 and #8 in FY2025; down 7 since FY2020.
25	Vista Defense Technologies, LLC 2 awardees Top agencies Army (Department of the Army)	$4,481,465	0.6%	Rank history: #36 in FY2022, #40 in FY2023, #32 in FY2024 and #29 in FY2025; up 17 since FY2020.
26	Olgoonik Corporation Through Olgoonik Solutions LLC Top agencies DOE (Department of Energy)	$4,260,810	0.6%	Rank history: #42 in FY2022, #33 in FY2023, #95 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
27	Tic Security, LLC Top agencies SEC (Securities and Exchange Commission) DHS (Department of Homeland Security) Commerce (Department of Commerce)	$4,218,725	0.6%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
28	Usmax Corporation Top agencies USAID (US Agency for International Development) USAGM (US Agency for Global Media) DOS (Department of State)	$4,211,944	0.6%	Rank history: #38 in FY2022, #50 in FY2023, not on the FY2024 list and #53 in FY2025; down 2 since FY2020.
29	Fire & Access Control Systems.com, Inc. Top agencies Army (Department of the Army)	$3,872,958	0.5%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
30	Concord Crossroads LLC Top agencies Army (Department of the Army)	$3,675,518	0.5%	Rank history: #34 in FY2022, #35 in FY2023, #60 in FY2024 and not on the FY2025 list; down 3 since FY2020.
31	Firelake Construction Inc. 2 awardees Top agencies Army (Department of the Army)	$3,656,292	0.5%	Rank history: #41 in FY2022, #38 in FY2023, #29 in FY2024 and #23 in FY2025; up 5 since FY2020.
32	Cherokee Nation Through Cherokee Federal Solutions, L.L.C. Top agencies Treasury (Department of the Treasury) Army (Department of the Army)	$3,338,294	0.5%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; up 26 since FY2020.
33	Adamo Construction Inc. Top agencies Navy (Department of the Navy)	$3,308,466	0.5%	Rank history: #53 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
34	Gonzales Consulting Services Inc. Top agencies SSA (Social Security Administration)	$3,258,477	0.5%	Rank history: #35 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
35	Integrated Security Technologies Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DARPA (Defense Advanced Research Projects Agency)	$3,147,033	0.4%	Rank history: #62 in FY2022, #39 in FY2023, #34 in FY2024 and #59 in FY2025; down 15 since FY2020.
36	Kastle Systems LLC Top agencies SEC (Securities and Exchange Commission) Treasury (Department of the Treasury) CFTC (Commodity Futures Trading Commission)	$3,101,701	0.4%	Rank history: #47 in FY2022, #53 in FY2023, #56 in FY2024 and #71 in FY2025; up 5 since FY2020.
37	Advanced Technology Systems Company, Inc. (OF Virginia) Top agencies USAF (Department of the Air Force)	$2,983,605	0.4%	Rank history: #2 in FY2022, #14 in FY2023, #4 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
38	Signet Technologies Inc. 5 awardees, including Convergint Technologies LLC, T.l. Garden & Associates, Inc. and Total Recall Corporation Top agencies DLA (Defense Logistics Agency) DISA (Defense Information Systems Agency) VA (Department of Veterans Affairs)	$2,920,451	0.4%	Rank history: #60 in FY2022, #30 in FY2023, #37 in FY2024 and #65 in FY2025; down 9 since FY2020.
39	Cherokee Nation System Solutions LLC Top agencies Treasury (Department of the Treasury)	$2,791,832	0.4%	Rank history: #30 in FY2022, #19 in FY2023, #16 in FY2024 and not on the FY2025 list; up 102 since FY2020.
40	Global Resource Solutions Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) GSA (General Services Administration)	$2,608,293	0.4%	Rank history: #43 in FY2022, #32 in FY2023, #36 in FY2024 and #26 in FY2025; down 17 since FY2020.
41	Srctec, LLC Top agencies USAF (Department of the Air Force)	$2,470,409	0.3%	Rank history: not on the FY2022–FY2023 lists, #25 in FY2024 and #22 in FY2025; new, not ranked in FY2020.
42	Acme Technical Group LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$2,368,828	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Itm4G LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$2,352,273	0.3%	Rank history: #22 in FY2022, #24 in FY2023, #26 in FY2024 and #21 in FY2025; up 1 since FY2020.
44	KR Contracting Inc. Top agencies OPM (Office of Personnel Management)	$2,346,351	0.3%	Rank history: #48 in FY2022, #47 in FY2023, #81 in FY2024 and #49 in FY2025; up 43 since FY2020.
45	Lbyd Federal, LLC Top agencies OSD (Office of the Secretary of Defense)	$2,274,611	0.3%	Rank history: #81 in FY2022, #45 in FY2023, #48 in FY2024 and #46 in FY2025; up 5 since FY2020.
46	OSI Systems Inc. 2 awardees, including American Science & Engineering Inc. and Rapiscan Systems Inc. Top agencies USAF (Department of the Air Force) DOS (Department of State) National Gallery of Art	$2,237,214	0.3%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; up 268 since FY2020.
47	Communications Resource Inc. Top agencies Commerce (Department of Commerce) USDA (Department of Agriculture) CSOSA (Court Services and Offender Supervision Agency)	$2,087,246	0.3%	Rank history: #46 in FY2022, not on the FY2023 list, #54 in FY2024 and #96 in FY2025; down 19 since FY2020.
48	Oatridge-Evergreen 8A2 JV LLC Top agencies Army (Department of the Army)	$2,030,414	0.3%	Rank history: not on the FY2022–FY2025 lists; up 61 since FY2020.
49	Afognak Native Corporation 7 awardees, including Alutiiq Professional Training, LLC, Shields Point LLC and Alutiiq Information Management, LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$2,020,632	0.3%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 40 since FY2020.
50	Security2000 LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$1,803,029	0.2%	Rank history: #87 in FY2022, #99 in FY2023, #83 in FY2024 and #78 in FY2025; up 45 since FY2020.
51	Nana Regional Corporation Inc Through Lockwood Hills Federal LLC Top agencies Army (Department of the Army)	$1,802,437	0.2%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
52	Johnsondanforth, Inc. Top agencies VA (Department of Veterans Affairs)	$1,800,273	0.2%	Rank history: #74 in FY2022, #83 in FY2023, #94 in FY2024 and #72 in FY2025; down 1 since FY2020.
53	21St Century Solutions, Ltd. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,754,273	0.2%	Rank history: not on the FY2022–FY2025 lists; up 273 since FY2020.
54	Infotek Systems and Solutions Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency)	$1,674,550	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Ark Construction Management LLC Top agencies Army (Department of the Army)	$1,665,927	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Securityhunter, Inc. Top agencies Navy (Department of the Navy) SSA (Social Security Administration) DCMA (Defense Contract Management Agency)	$1,653,616	0.2%	Rank history: not on the FY2022 list, #65 in FY2023, #55 in FY2024 and not on the FY2025 list; up 63 since FY2020.
57	Systems Northwest, LLC Top agencies HHS (Department of Health and Human Services)	$1,612,006	0.2%	Rank history: #80 in FY2022, #62 in FY2023, #53 in FY2024 and #44 in FY2025; up 87 since FY2020.
58	Red River Science & Technology, LLC Top agencies USAF (Department of the Air Force)	$1,593,989	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
59	Trilogy Secured Services, L.l.c Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice) Commerce (Department of Commerce)	$1,578,589	0.2%	Rank history: #68 in FY2022, #20 in FY2023, #28 in FY2024 and #86 in FY2025; up 18 since FY2020.
60	Adolf Lupp GMBH + Co. KG Through Lupp Facility Management GMBH Top agencies Army (Department of the Army)	$1,569,586	0.2%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
61	Computer Information Systems Inc. Through Security Information Systems, LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,556,218	0.2%	Rank history: not on the FY2022–FY2025 lists; up 371 since FY2020.
62	Cintron Lock & Safe, Inc. Top agencies DOS (Department of State)	$1,522,059	0.2%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
63	Matos Builders LLC Top agencies Commerce (Department of Commerce)	$1,509,322	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	National Contracting Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$1,500,166	0.2%	Rank history: #58 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; up 84 since FY2020.
65	Trulink LLC Top agencies Commerce (Department of Commerce)	$1,497,643	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Fiber Business Solutions Group Inc. Top agencies DOI (Department of the Interior)	$1,435,800	0.2%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
67	Anduril Industries, Inc. Top agencies Navy (Department of the Navy)	$1,435,000	0.2%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
68	Securitas AB 3 awardees, including Securitas Electronic Security, Inc. and Securitas OY Top agencies Treasury (Department of the Treasury) DOJ (Department of Justice) AOUSC (Administrative Office of the U.S. Courts)	$1,426,787	0.2%	Rank history: #9 in FY2022, #2 in FY2023, #5 in FY2024 and not on the FY2025 list; up 139 since FY2020.
69	Onerain Incorporated Top agencies DOI (Department of the Interior)	$1,425,342	0.2%	Rank history: #83 in FY2022, #94 in FY2023, #93 in FY2024 and #66 in FY2025; down 36 since FY2020.
70	Active Security Consulting LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$1,305,045	0.2%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 117 since FY2020.
71	Echelon Services, LLC Top agencies HUD (Department of Housing and Urban Development)	$1,291,720	0.2%	Rank history: #94 in FY2022, #55 in FY2023, #49 in FY2024 and #31 in FY2025; up 69 since FY2020.
72	Cynergy Professional Systems LLC Top agencies VA (Department of Veterans Affairs) DOS (Department of State)	$1,198,842	0.2%	Rank history: #33 in FY2022, #58 in FY2023, #69 in FY2024 and #43 in FY2025; up 6 since FY2020.
73	Planning, Inc. Top agencies DISA (Defense Information Systems Agency) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$1,193,442	0.2%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
74	Scdatacom, LLC Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior) USAF (Department of the Air Force)	$1,176,711	0.2%	Rank history: #23 in FY2022, #18 in FY2023, #12 in FY2024 and #11 in FY2025; down 7 since FY2020.
75	Connected Technology Integrators, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) DHS (Department of Homeland Security)	$1,171,630	0.2%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; up 274 since FY2020.
76	Diamond Security, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) Commerce (Department of Commerce)	$1,119,120	0.2%	Rank history: #39 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 58 since FY2020.
77	J2 Associates, LLC Top agencies USDA (Department of Agriculture) Army (Department of the Army) DOT (Department of Transportation)	$1,108,257	0.2%	Rank history: #64 in FY2022, not on the FY2023 list, #89 in FY2024 and #58 in FY2025; up 85 since FY2020.
78	Integrity Protection Systems LLC Top agencies VA (Department of Veterans Affairs)	$1,105,903	0.2%	Rank history: not on the FY2022–FY2025 lists; up 146 since FY2020.
79	Starboard Industries LLC Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior)	$1,101,996	0.2%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; up 93 since FY2020.
80	Corelogix Consulting Inc. Top agencies DHS (Department of Homeland Security)	$1,043,250	0.1%	Rank history: #16 in FY2022, #34 in FY2023, #91 in FY2024 and #70 in FY2025; down 35 since FY2020.
81	Bws-Arti LLC Top agencies DOE (Department of Energy)	$1,000,181	0.1%	Rank history: not on the FY2022–FY2025 lists; down 29 since FY2020.
82	Optimum Low Voltage LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) Army (Department of the Army)	$977,847	0.1%	Rank history: #86 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
83	Professional Technologies Group, Inc. Top agencies Army (Department of the Army)	$977,598	0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
84	Corbett Technology Solutions Inc. Through Integrated Security Solutions Inc. Top agencies USAF (Department of the Air Force) Treasury (Department of the Treasury) DHS (Department of Homeland Security)	$975,880	0.1%	Rank history: not on the FY2022 list, #100 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
85	Secsol Inc. Top agencies VA (Department of Veterans Affairs)	$956,670	0.1%	Rank history: #70 in FY2022, not on the FY2023 list, #82 in FY2024 and #95 in FY2025; up 9 since FY2020.
86	High TECH Innovation Corp Top agencies DHS (Department of Homeland Security)	$951,718	0.1%	Rank history: not on the FY2022–FY2025 lists; up 150 since FY2020.
87	Sinew Management Group LLC Top agencies Army (Department of the Army)	$948,811	0.1%	Rank history: not on the FY2022–FY2025 lists; down 22 since FY2020.
88	Stanley Black & Decker, Inc. 5 awardees, including Securitas Technology Corporation and Stanley Convergent Security Solutions, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USAF (Department of the Air Force)	$935,432	0.1%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; up 40 since FY2020.
89	Ma Impianti S.R.L. Top agencies Army (Department of the Army)	$920,403	0.1%	Rank history: #100 in FY2022, #54 in FY2023, not on the FY2024 list and #92 in FY2025; up 11 since FY2020.
90	Ross Professional Services LLC Top agencies Army (Department of the Army)	$896,055	0.1%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
91	M3T Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army) VA (Department of Veterans Affairs)	$885,616	0.1%	Rank history: #91 in FY2022, not on the FY2023 list, #74 in FY2024 and #68 in FY2025; down 27 since FY2020.
92	Security Install Solutions, Inc. Top agencies DOI (Department of the Interior) GSA (General Services Administration) DHS (Department of Homeland Security)	$885,240	0.1%	Rank history: not on the FY2022–FY2025 lists; up 253 since FY2020.
93	Honeywell International Inc. 4 awardees, including Vindicator Technologies, Inc. Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs) DOT (Department of Transportation)	$865,046	0.1%	Rank history: #63 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
94	Diebold Nixdorf, Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) NARA (National Archives and Records Administration) DOJ (Department of Justice)	$858,167	0.1%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
95	Silent Partner Security Systems, Inc. Top agencies ED (Department of Education) DHS (Department of Homeland Security)	$853,453	0.1%	Rank history: not on the FY2022–FY2025 lists; down 19 since FY2020.
96	Talon Veteran Services Incorporated Top agencies VA (Department of Veterans Affairs)	$849,316	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	F-Concepts, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$841,470	0.1%	Rank history: #85 in FY2022, not on the FY2023 list, #72 in FY2024 and #83 in FY2025; up 17 since FY2020.
98	Digital Air Control, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$837,228	0.1%	Rank history: not on the FY2022–FY2024 lists and #30 in FY2025; down 13 since FY2020.
99	Apogee-Ssu Joint Venture LLC Top agencies DHS (Department of Homeland Security)	$814,402	0.1%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
100	Premier Global Production Company Inc Top agencies AOUSC (Administrative Office of the U.S. Courts) GSA (General Services Administration)	$803,150	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 979 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 56162

Code	Net obligations	Largest contractor
561621 Security Systems Services (except Locksmiths)	$668,033,676	M.c. Dean, Inc.
561622 Locksmiths	$6,509,498	21St Century Solutions, Ltd.

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 $724 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 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 56162 contractors in FY2021?

1. M.c. Dean, Inc. ($75.1M), 2. Johnson Controls Security Solutions LLC ($65.7M), 3. Serco North America (Holdings) Inc ($51M), 4. Triple Canopy Inc. ($41.6M), 5. CACI International Inc. ($34.2M), 6. The Chenega Corporation ($19.2M), 7. Xator LLC ($18.7M), 8. Kbr, Inc. ($14.2M), 9. SRC Inc. ($14.1M), 10. Versar Inc. ($14M).

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