Top 100 Contractors in PSC N0: Installation of Equipment, FY2021

Name: Top 100 Contractors in PSC N0: Installation of Equipment, FY2021
Creator: GovTribe

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

The top 10 won 41% of FY2021 PSC N0 contract dollars

Contract obligations: $2,000,160,159 Net of deobligations, by contracts coded PSC N0 or a code under it
Contractors: 1,952 Parent companies with an obligation
Largest contractor: Puritan Medical Products Company I LP $267 million, 12.5% 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	Puritan Medical Products Company I LP Top agencies USAF (Department of the Air Force)	$267,469,191	12.5%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
2	Johnson Controls Security Solutions LLC 13 awardees, including Johnson Controls Building Automation Systems, LLC, Johnson Controls, Inc. and Johnson Controls, K.K. Top agencies Army (Department of the Army) WHS (DOD Washington Headquarters Service) HHS (Department of Health and Human Services)	$107,389,410	5.0%	Rank history: #3 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
3	Serco North America (Holdings) Inc 2 awardees, including Serco Inc. and Whitney Bradley & Brown, Inc. Top agencies Navy (Department of the Navy) DOJ (Department of Justice)	$104,953,947	4.9%	Rank history: #9 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
4	Northrop Grumman Corporation 5 awardees, including Northrop Grumman Systems Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$72,475,136	3.4%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; up 10 since FY2020.
5	Methuen Construction Co Inc. Top agencies Navy (Department of the Navy)	$62,641,302	2.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
6	Lockheed Martin Corporation 7 awardees, including Lockheed Martin Overseas, LLC Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$62,274,438	2.9%	Rank history: not on the FY2022 list, #25 in FY2023, #40 in FY2024 and not on the FY2025 list; up 16 since FY2020.
7	M.c. Dean, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOD (Department of Defense)	$58,237,069	2.7%	Rank history: #4 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; down 4 since FY2020.
8	BAE Systems PLC 2 awardees, including BAE Systems Technology Solutions & Services Inc. Top agencies Navy (Department of the Navy)	$52,667,421	2.5%	Rank history: #6 in FY2022, #5 in FY2023, #4 in FY2024 and #2 in FY2025; down 7 since FY2020.
9	Jacobs Engineering Group Inc. Through Ch2M Facility Support Services, LLC Top agencies DHS (Department of Homeland Security)	$46,635,826	2.2%	Rank history: #31 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
10	WSP USA Solutions Inc. Top agencies Army (Department of the Army)	$45,666,230	2.1%	Rank history: #11 in FY2022, #13 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
11	Siemens Aktiengesellschaft 4 awardees, including Siemens Government Technologies Inc., Siemens Healthcare Diagnostics Inc. and Siemens Industry Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHA (Defense Health Agency)	$42,975,234	2.0%	Rank history: #8 in FY2022, #6 in FY2023, #24 in FY2024 and #30 in FY2025; down 7 since FY2020.
12	VT Milcom Inc. Top agencies Navy (Department of the Navy)	$38,954,950	1.8%	Rank history: #12 in FY2022, #10 in FY2023, #13 in FY2024 and #14 in FY2025; down 3 since FY2020.
13	Tecan Group AG Through Tecan U.s., Inc. Top agencies USAF (Department of the Air Force)	$32,862,500	1.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
14	Aptim Federal Services LLC Top agencies DHS (Department of Homeland Security)	$27,802,241	1.3%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
15	N2Grate Government Technology Solutions, LLC Top agencies DOL (Department of Labor)	$26,353,284	1.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
16	Huntington Ingalls Industries, Inc. Through HII Fleet Support Group LLC Top agencies Navy (Department of the Navy)	$25,886,273	1.2%	Rank history: #13 in FY2022, #15 in FY2023, #23 in FY2024 and #31 in FY2025; up 29 since FY2020.
17	BAE Systems Land & Armaments L.P. 2 awardees, including BAE Systems Technology Solutions & Services Inc. and BAE Systems Information and Electronic Systems Integration Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$25,379,214	1.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Parsons Corporation 4 awardees, including Parsons Government Services Inc., Williams Electric Co Inc. and Ptsi Managed Services Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) DISA (Defense Information Systems Agency)	$24,448,594	1.1%	Rank history: #15 in FY2022, #21 in FY2023, #34 in FY2024 and #21 in FY2025; down 12 since FY2020.
19	Checkmate Global, LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$23,388,443	1.1%	Rank history: not on the FY2022–FY2023 lists, #21 in FY2024 and not on the FY2025 list; up 157 since FY2020.
20	Olgoonik Corporation Through Olgoonik Solutions, LLC Top agencies DOS (Department of State)	$22,909,599	1.1%	Rank history: not on the FY2022–FY2025 lists; up 44 since FY2020.
21	Prism Maritime, Inc. Top agencies Navy (Department of the Navy)	$22,802,573	1.1%	Rank history: #28 in FY2022, #8 in FY2023, #5 in FY2024 and #6 in FY2025; down 11 since FY2020.
22	Xator LLC 2 awardees, including Incadence Strategic Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DOS (Department of State)	$20,723,028	1.0%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 18 since FY2020.
23	Krueger International, Inc. 2 awardees, including Spacesaver Storage Systems Inc. Top agencies DOJ (Department of Justice) DOI (Department of the Interior) VA (Department of Veterans Affairs)	$20,498,542	1.0%	Rank history: #16 in FY2022, #26 in FY2023, #25 in FY2024 and #27 in FY2025; new, not ranked in FY2020.
24	Wells Global, LLC Top agencies DOT (Department of Transportation)	$17,642,109	0.8%	Rank history: #18 in FY2022, #9 in FY2023, #20 in FY2024 and #12 in FY2025; down 13 since FY2020.
25	Kbr, Inc. Through KBR Wyle Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DOJ (Department of Justice)	$17,027,993	0.8%	Rank history: #22 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
26	Sealaska Secure Construction Solutions, LLC Top agencies DOJ (Department of Justice)	$15,000,000	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
27	Securityhunter, Inc. Top agencies SSA (Social Security Administration)	$14,772,880	0.7%	Rank history: #19 in FY2022, #19 in FY2023, #22 in FY2024 and #10 in FY2025; down 8 since FY2020.
28	Spectrum Solutions Inc. Top agencies Army (Department of the Army) DCSA (Defense Counterintelligence and Security Agency) Navy (Department of the Navy)	$14,592,587	0.7%	Rank history: #17 in FY2022, #14 in FY2023, #8 in FY2024 and #13 in FY2025; down 13 since FY2020.
29	Corbett Technology Solutions Inc. 2 awardees, including Integrated Security Solutions Inc. and Pavion Corp. Top agencies Army (Department of the Army) USUHS (DOD Uniformed Services University of the Health Sciences) USAF (Department of the Air Force)	$13,656,420	0.6%	Rank history: #23 in FY2022, #17 in FY2023, #43 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
30	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$13,603,531	0.6%	Rank history: #10 in FY2022, #11 in FY2023, #11 in FY2024 and #9 in FY2025; up 56 since FY2020.
31	L3Harris Technologies, Inc. 5 awardees, including L3Harris Technologies Integrated Systems L.P. and L3Harris Maritime Services Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$13,363,308	0.6%	Rank history: #80 in FY2022, not on the FY2023 list, #61 in FY2024 and #53 in FY2025; up 182 since FY2020.
32	Still Gesellschaft MIT Beschrankter Haftung Through Dematic Corp Top agencies Army (Department of the Army)	$11,999,220	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	TM3 Solutions, Inc. Top agencies WHS (DOD Washington Headquarters Service) DISA (Defense Information Systems Agency) OSD (Office of the Secretary of Defense)	$11,672,962	0.5%	Rank history: #33 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
34	Ultra Electronics Advanced Tactical Systems Inc. Top agencies Navy (Department of the Navy)	$11,618,288	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Evergreen Fire Alarms LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$11,471,536	0.5%	Rank history: not on the FY2022–FY2025 lists; down 11 since FY2020.
36	Johnson Controls Building Automation Systems, LLC 2 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$10,961,392	0.5%	Rank history: not on the FY2022–FY2023 lists, #2 in FY2024 and #4 in FY2025; up 20 since FY2020.
37	BCI Construction Usa, Inc. Top agencies DOI (Department of the Interior)	$10,431,176	0.5%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
38	Cook Inlet Region Inc. 2 awardees, including Silver Mountain Construction, LLC and Weldin Construction LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$9,917,810	0.5%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
39	Government of Canada Through Canadian Commercial Corporation Top agencies USAF (Department of the Air Force)	$9,693,090	0.5%	Rank history: #39 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 16 since FY2020.
40	Mantech International Corporation Through Mantech Advanced Systems International, Inc. Top agencies Navy (Department of the Navy)	$9,610,211	0.5%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
41	Gsina-Pacific JV LLC Top agencies Army (Department of the Army)	$9,472,958	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	Signet Technologies Inc. 3 awardees, including Convergint Technologies LLC and Total Recall Corporation Top agencies Army (Department of the Army) DODEA (Department of Defense Education Activity) GSA (General Services Administration)	$8,748,016	0.4%	Rank history: #20 in FY2022, #23 in FY2023, #47 in FY2024 and #39 in FY2025; down 6 since FY2020.
43	Cusa Consulting LLC Top agencies DOT (Department of Transportation)	$8,702,804	0.4%	Rank history: #30 in FY2022, #18 in FY2023, #17 in FY2024 and #41 in FY2025; down 30 since FY2020.
44	Nana Regional Corporation Inc 3 awardees, including Talu LLC Top agencies Army (Department of the Army) USDA (Department of Agriculture) HHS (Department of Health and Human Services)	$7,814,568	0.4%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; down 28 since FY2020.
45	Schneider Electric Buildings Americas Inc. 4 awardees, including Schneider Electric Federal, Inc., Schneider Electric It Mission Critical Services, Inc. and Asco Power Services Inc. Top agencies Navy (Department of the Navy) Treasury (Department of the Treasury) Army (Department of the Army)	$6,947,915	0.3%	Rank history: #47 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
46	Wildflower International, Ltd. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$6,933,223	0.3%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
47	BPD Engineering, LLC Top agencies DOJ (Department of Justice)	$6,868,920	0.3%	Rank history: #32 in FY2022, #56 in FY2023, #89 in FY2024 and #74 in FY2025; up 69 since FY2020.
48	Disaster Solutions Alliance, LLC Top agencies DHS (Department of Homeland Security)	$6,718,190	0.3%	Rank history: #7 in FY2022, #33 in FY2023, not on the FY2024 list and #68 in FY2025; up 52 since FY2020.
49	Indyne, Inc. 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$6,498,067	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Ocean Construction Services Inc. Top agencies Navy (Department of the Navy)	$6,350,947	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	MLU Services, LLC Top agencies DHS (Department of Homeland Security)	$6,323,483	0.3%	Rank history: #5 in FY2022, #7 in FY2023, #29 in FY2024 and #7 in FY2025; new, not ranked in FY2020.
52	Field Aviation, Inc. Through Ases LLC Top agencies USAF (Department of the Air Force)	$6,304,142	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Vectrus Systems Corporation Through Advantor Systems II LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$6,234,694	0.3%	Rank history: #40 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 62 since FY2020.
54	Epsilon Systems Solutions, Inc. Top agencies Navy (Department of the Navy)	$6,100,893	0.3%	Rank history: #48 in FY2022, #39 in FY2023, #60 in FY2024 and #71 in FY2025; down 5 since FY2020.
55	EPC Service Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOT (Department of Transportation)	$6,076,466	0.3%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
56	Accelint Global Inc. Top agencies Navy (Department of the Navy)	$5,856,841	0.3%	Rank history: #62 in FY2022, #86 in FY2023, #68 in FY2024 and not on the FY2025 list; down 44 since FY2020.
57	Sei Group Inc. Top agencies Army (Department of the Army) DIA (Defense Intelligence Agency) DCSA (Defense Counterintelligence and Security Agency)	$5,717,694	0.3%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; down 22 since FY2020.
58	Calista Corp Through Yulista Support Services LLC Top agencies DHS (Department of Homeland Security)	$5,447,740	0.3%	Rank history: not on the FY2022 list, #80 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
59	Purvis Systems Inc. Top agencies Navy (Department of the Navy)	$5,134,494	0.2%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; up 3 since FY2020.
60	Sentinel Power Services, LLC Top agencies DOT (Department of Transportation)	$5,127,941	0.2%	Rank history: #25 in FY2022, #40 in FY2023, #31 in FY2024 and #32 in FY2025; down 37 since FY2020.
61	Copan Industries Inc. Top agencies USAF (Department of the Air Force)	$4,999,999	0.2%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
62	Chugach Technical Solutions LLC Top agencies DHS (Department of Homeland Security)	$4,735,000	0.2%	Rank history: not on the FY2022–FY2025 lists; up 286 since FY2020.
63	Sierra Nevada Company, LLC Top agencies Navy (Department of the Navy)	$4,610,991	0.2%	Rank history: #45 in FY2022, #66 in FY2023, #53 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
64	Presidio Government Solutions LLC 2 awardees, including Presidio Networked Solutions, LLC Top agencies Navy (Department of the Navy) DOJ (Department of Justice)	$4,532,424	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Infotec Systems Corp Top agencies Army (Department of the Army)	$4,454,183	0.2%	Rank history: #61 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; down 22 since FY2020.
66	CE Power Engineered Services LLC Through Reuter & Hanney, Inc. Top agencies Treasury (Department of the Treasury)	$4,264,283	0.2%	Rank history: not on the FY2022–FY2025 lists; up 28 since FY2020.
67	Systems Engineering Support Co. Top agencies Navy (Department of the Navy)	$4,130,269	0.2%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
68	Tanadgusix Corporation Through TDX Power Services LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$3,974,209	0.2%	Rank history: not on the FY2022–FY2025 lists; up 123 since FY2020.
69	Industries for the Blind and Visually Impaired, Inc. Top agencies DOI (Department of the Interior)	$3,971,110	0.2%	Rank history: #73 in FY2022, not on the FY2023 list, #81 in FY2024 and not on the FY2025 list; up 35 since FY2020.
70	Koontz Electric Company, Incorporated Top agencies Army (Department of the Army)	$3,914,828	0.2%	Rank history: not on the FY2022 list, #27 in FY2023, not on the FY2024 list and #43 in FY2025; new, not ranked in FY2020.
71	Cherokee Nation 4 awardees, including Cherokee Nation Management & Consulting, L.l.c.., Cherokee Nation Red Wing, L.L.C. and Cherokee Federal Solutions, L.L.C. Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$3,898,519	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Bowhead Mission Solutions, LLC Top agencies USAF (Department of the Air Force)	$3,834,433	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Clayarch Inc. Top agencies Navy (Department of the Navy)	$3,785,402	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Rausch Infrastructure LLC Top agencies Army (Department of the Army)	$3,687,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Professionals HIR LLC Top agencies Commerce (Department of Commerce) Army (Department of the Army)	$3,652,383	0.2%	Rank history: not on the FY2022–FY2025 lists; up 271 since FY2020.
76	22Nd Century Technologies, Inc. Top agencies OSD (Office of the Secretary of Defense)	$3,648,010	0.2%	Rank history: not on the FY2022 list, #100 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
77	Cambridge International Systems, Inc. Top agencies Navy (Department of the Navy)	$3,582,282	0.2%	Rank history: #84 in FY2022, not on the FY2023–FY2024 lists and #56 in FY2025; down 47 since FY2020.
78	Long Wave Inc. Top agencies USAF (Department of the Air Force)	$3,532,939	0.2%	Rank history: not on the FY2022–FY2025 lists; down 50 since FY2020.
79	Cardinal Marine Group Inc. Top agencies Army (Department of the Army)	$3,523,171	0.2%	Rank history: not on the FY2022–FY2025 lists; up 133 since FY2020.
80	Dewberry Design-Builders Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,397,003	0.2%	Rank history: #27 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; down 49 since FY2020.
81	VOS Systems Inc. Top agencies USAF (Department of the Air Force)	$3,359,231	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Quad J Inc. Top agencies DOT (Department of Transportation)	$3,353,454	0.2%	Rank history: #42 in FY2022, #69 in FY2023, #30 in FY2024 and #61 in FY2025; down 41 since FY2020.
83	Vast Industries, LLC Top agencies Army (Department of the Army)	$3,338,650	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Koam Engineering Systems, Inc. Top agencies Navy (Department of the Navy)	$3,313,120	0.2%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 164 since FY2020.
85	Koninklijke Philips N.V. Through Philips North America LLC Top agencies VA (Department of Veterans Affairs)	$3,299,007	0.2%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
86	All Phase Solutions LLC Top agencies Army (Department of the Army)	$3,276,176	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Pyramid Contracting LLC Top agencies Army (Department of the Army)	$3,178,978	0.1%	Rank history: not on the FY2022–FY2025 lists; up 23 since FY2020.
88	Continental Tide Defense Systems, Inc. Top agencies Navy (Department of the Navy)	$3,132,812	0.1%	Rank history: not on the FY2022 list, #77 in FY2023, #82 in FY2024 and not on the FY2025 list; down 7 since FY2020.
89	Prime Mechanical of Wisconsin LLC Top agencies Army (Department of the Army)	$3,054,827	0.1%	Rank history: not on the FY2022 list, #76 in FY2023, not on the FY2024 list and #88 in FY2025; up 48 since FY2020.
90	Puyenpa Services, LLC Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$3,036,674	0.1%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
91	Cynergy Professional Systems LLC Top agencies VA (Department of Veterans Affairs)	$2,981,930	0.1%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; up 58 since FY2020.
92	Katz Law Enforcement Vehicle Installations, Inc. Top agencies DOJ (Department of Justice)	$2,922,725	0.1%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
93	Low Voltage Wiring Ltd Top agencies Army (Department of the Army) Navy (Department of the Navy) DHA (Defense Health Agency)	$2,868,002	0.1%	Rank history: #94 in FY2022, #68 in FY2023, #75 in FY2024 and #65 in FY2025; down 14 since FY2020.
94	Windstorm, Inc. Top agencies DHS (Department of Homeland Security)	$2,838,195	0.1%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; down 47 since FY2020.
95	Planate-Argo Federal Services Joint Venture LLC Top agencies Navy (Department of the Navy)	$2,820,882	0.1%	Rank history: #53 in FY2022, not on the FY2023 list, #55 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
96	Mitomo Denki Service Co. Ltd. Through Mitomo Co., Ltd. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$2,767,548	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	APC DB JV LLC Top agencies DOJ (Department of Justice)	$2,747,484	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Ricardo Perez S.a. Through Olsson Industrial Electric, Inc. Top agencies Army (Department of the Army)	$2,673,187	0.1%	Rank history: not on the FY2022–FY2025 lists; down 78 since FY2020.
99	New Mexico Emergency Products LLC 2 awardees, including Arizona Emergency Products, Inc. Top agencies DOI (Department of the Interior)	$2,668,764	0.1%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
100	Signal Technologies, Incorporated Top agencies VA (Department of Veterans Affairs)	$2,642,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 1,952 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC N0

Code	Net obligations	Largest contractor
N059 Installation of Equipment: Electrical and Electronic Equipment Components	$605,209,055	Johnson Controls Security Solutions LLC
N065 Installation of Equipment: Medical, Dental, and Veterinary Equipment and Supplies	$320,949,977	Puritan Medical Products Company I LP
N063 Installation of Equipment: Alarm, Signal, and Security Detection Systems	$122,184,083	M.c. Dean, Inc.
N045 Installation of Equipment: Plumbing, Heating, and Waste Disposal Equipment	$111,551,924	Jacobs Engineering Group Inc.
N058 Installation of Equipment: Communication, Detection, and Coherent Radiation Equipment	$77,611,994	BAE Systems PLC
N099 Installation of Equipment: Miscellaneous	$73,870,446	N2Grate Government Technology Solutions, LLC
N061 Installation of Equipment: Electric Wire, and Power and Distribution Equipment	$69,159,792	Wells Global, LLC
N071 Installation of Equipment: Furniture	$51,825,729	Krueger International, Inc.
N066 Installation of Equipment: Instruments and Laboratory Equipment	$27,133,735	Siemens Aktiengesellschaft
N041 Installation of Equipment: Refrigeration, Air Conditioning, and Air Circulating Equipment	$21,101,657	Clayarch Inc.
N070 Installation of Equipment: Automatic Data Processing Equipment (Including Firmware), Software, Supplies and Support Equipment	$20,118,175	TM3 Solutions, Inc.
N054 Installation of Equipment: Prefabricated Structures and Scaffolding	$14,984,609	BPD Engineering, LLC
N012 Installation of Equipment: Fire Control Equipment	$10,148,876	Es Squared, LLC
N072 Installation of Equipment: Household and Commercial Furnishings and Appliances	$5,266,306	Ashland Industrial Services, LLC
N043 Installation of Equipment: Pumps and Compressors	$5,119,368	Rausch Infrastructure LLC
N042 Installation of Equipment: Fire Fighting, Rescue, and Safety Equipment; and Environmental Protection Equipment and Materials	$4,913,576	Professionals HIR LLC
N056 Installation of Equipment: Construction and Building Materials	$4,270,390	Cccs International LLC
N062 Installation of Equipment: Lighting Fixtures and Lamps	$3,025,703	A. James Global Services, Inc.
N049 Installation of Equipment: Maintenance and Repair Shop Equipment	$697,316	Exelon Corporation

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 $2.13 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC N0 contractors in FY2021?

1. Puritan Medical Products Company I LP ($267M), 2. Johnson Controls Security Solutions LLC ($107M), 3. Serco North America (Holdings) Inc ($105M), 4. Northrop Grumman Corporation ($72.5M), 5. Methuen Construction Co Inc. ($62.6M), 6. Lockheed Martin Corporation ($62.3M), 7. M.c. Dean, Inc. ($58.2M), 8. BAE Systems PLC ($52.7M), 9. Jacobs Engineering Group Inc. ($46.6M), 10. WSP USA Solutions Inc. ($45.7M).

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