Top 100 Contractors in PSC N059: Installation of Equipment: Electrical and Electronic Equipment Components, FY2021

Name: Top 100 Contractors in PSC N059: Installation of Equipment: Electrical and Electronic Equipment Components, FY2021
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

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

The top 10 won 58% of FY2021 PSC N059 contract dollars

Contract obligations: $605,209,055 Net of deobligations, by contracts coded PSC N059
Contractors: 363 Parent companies with an obligation
Largest contractor: Johnson Controls Security Solutions LLC $93.9 million, 15.1% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Johnson Controls Security Solutions LLC 6 awardees, including Johnson Controls Building Automation Systems, LLC, Johnson Controls, K.K. and Johnson Controls, Inc. Top agencies Army (Department of the Army) WHS (DOD Washington Headquarters Service) USAF (Department of the Air Force)	$93,907,580	15.1%	Rank history: #1 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
2	Serco North America (Holdings) Inc Through Serco Inc. Top agencies Navy (Department of the Navy)	$76,051,709	12.2%	Rank history: #6 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
3	BAE Systems PLC Through BAE Systems Technology Solutions & Services Inc. Top agencies Navy (Department of the Navy)	$31,737,484	5.1%	Rank history: #4 in FY2022, #3 in FY2023, #3 in FY2024 and #4 in FY2025; down 1 since FY2020.
4	Siemens Aktiengesellschaft Through Siemens Government Technologies Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) USAF (Department of the Air Force)	$28,190,709	4.5%	Rank history: #5 in FY2022, #2 in FY2023, #14 in FY2024 and #13 in FY2025; down 1 since FY2020.
5	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	3.9%	Rank history: #7 in FY2022, #14 in FY2023, #20 in FY2024 and #8 in FY2025; down 1 since FY2020.
6	Olgoonik Corporation Through Olgoonik Solutions, LLC Top agencies DOS (Department of State)	$22,909,599	3.7%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
7	Huntington Ingalls Industries, Inc. Through HII Fleet Support Group LLC Top agencies Navy (Department of the Navy)	$22,363,017	3.6%	Rank history: #10 in FY2022, #13 in FY2023, #19 in FY2024 and #17 in FY2025; new, not ranked in FY2020.
8	Xator LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$20,580,098	3.3%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; up 10 since FY2020.
9	M.c. Dean, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOD (Department of Defense)	$20,151,502	3.2%	Rank history: #3 in FY2022, #5 in FY2023, #4 in FY2024 and #2 in FY2025; up 1 since FY2020.
10	VT Milcom Inc. Top agencies Navy (Department of the Navy)	$17,647,054	2.8%	Rank history: #9 in FY2022, #10 in FY2023, #13 in FY2024 and #15 in FY2025; up 33 since FY2020.
11	Kbr, Inc. Through KBR Wyle Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$16,610,333	2.7%	Rank history: #13 in FY2022, #20 in FY2023, #72 in FY2024 and not on the FY2025 list; down 3 since FY2020.
12	Spectrum Solutions Inc. Top agencies Army (Department of the Army) DCSA (Defense Counterintelligence and Security Agency) Navy (Department of the Navy)	$14,592,587	2.4%	Rank history: #8 in FY2022, #8 in FY2023, #5 in FY2024 and #6 in FY2025; down 7 since FY2020.
13	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) DOJ (Department of Justice)	$13,521,247	2.2%	Rank history: #15 in FY2022, #11 in FY2023, #25 in FY2024 and not on the FY2025 list; up 159 since FY2020.
14	Ultra Electronics Advanced Tactical Systems Inc. Top agencies Navy (Department of the Navy)	$11,618,288	1.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
15	Evergreen Fire Alarms LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$10,868,888	1.8%	Rank history: #25 in FY2022, #22 in FY2023, #54 in FY2024 and #39 in FY2025; down 6 since FY2020.
16	Prism Maritime, Inc. Top agencies Navy (Department of the Navy)	$10,472,234	1.7%	Rank history: not on the FY2022 list, #94 in FY2023, not on the FY2024 list and #76 in FY2025; new, not ranked in FY2020.
17	BAE Systems Land & Armaments L.P. Through BAE Systems Technology Solutions & Services Inc. Top agencies Navy (Department of the Navy)	$9,434,973	1.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Cook Inlet Region Inc. Through Silver Mountain Construction, LLC Top agencies DHS (Department of Homeland Security)	$9,071,161	1.5%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
19	Johnson Controls Building Automation Systems, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$6,854,428	1.1%	Rank history: not on the FY2022–FY2023 lists, #1 in FY2024 and #1 in FY2025; up 113 since FY2020.
20	Schneider Electric Buildings Americas Inc. 3 awardees, including Schneider Electric Federal, Inc. and Schneider Electric It Mission Critical Services, Inc. Top agencies Navy (Department of the Navy) Treasury (Department of the Treasury) Army (Department of the Army)	$6,653,607	1.1%	Rank history: #26 in FY2022, #9 in FY2023, #74 in FY2024 and not on the FY2025 list; down 5 since FY2020.
21	Wildflower International, Ltd. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$6,447,837	1.0%	Rank history: #33 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; up 114 since FY2020.
22	Indyne, Inc. Top agencies Army (Department of the Army)	$6,310,171	1.0%	Rank history: not on the FY2022 list, #63 in FY2023, #56 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
23	Signet Technologies Inc. Top agencies Army (Department of the Army) DODEA (Department of Defense Education Activity) Navy (Department of the Navy)	$6,205,624	1.0%	Rank history: #18 in FY2022, #16 in FY2023, #21 in FY2024 and #25 in FY2025; down 3 since FY2020.
24	EPC Service Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$6,031,803	1.0%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
25	Sei Group Inc. Top agencies Army (Department of the Army) DIA (Defense Intelligence Agency) DCSA (Defense Counterintelligence and Security Agency)	$5,717,694	0.9%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
26	Purvis Systems Inc. Top agencies Navy (Department of the Navy)	$5,134,494	0.8%	Rank history: #34 in FY2022, #35 in FY2023, #38 in FY2024 and #35 in FY2025; down 4 since FY2020.
27	Chugach Technical Solutions LLC Top agencies DHS (Department of Homeland Security)	$4,735,000	0.8%	Rank history: #41 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; up 53 since FY2020.
28	L3Harris Technologies, Inc. 2 awardees Top agencies Navy (Department of the Navy) Army (Department of the Army)	$4,593,824	0.7%	Rank history: #74 in FY2022, not on the FY2023 list, #37 in FY2024 and #26 in FY2025; up 14 since FY2020.
29	Infotec Systems Corp Top agencies Army (Department of the Army)	$4,454,183	0.7%	Rank history: #30 in FY2022, #27 in FY2023, #49 in FY2024 and #45 in FY2025; down 12 since FY2020.
30	CE Power Engineered Services LLC Through Reuter & Hanney, Inc. Top agencies Treasury (Department of the Treasury)	$4,264,283	0.7%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
31	Systems Engineering Support Co. Top agencies Navy (Department of the Navy)	$4,130,269	0.7%	Rank history: #39 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
32	Cardinal Marine Group Inc. Top agencies Army (Department of the Army)	$3,523,171	0.6%	Rank history: not on the FY2022 list, #43 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
33	Dewberry Design-Builders Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,397,003	0.5%	Rank history: #17 in FY2022, #15 in FY2023, not on the FY2024 list and #68 in FY2025; down 20 since FY2020.
34	Koontz Electric Company, Incorporated Top agencies Army (Department of the Army)	$3,165,838	0.5%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
35	Lockheed Martin Corporation Top agencies Navy (Department of the Navy)	$3,062,515	0.5%	Rank history: #37 in FY2022, #59 in FY2023, #40 in FY2024 and not on the FY2025 list; down 23 since FY2020.
36	Prime Mechanical of Wisconsin LLC Top agencies Army (Department of the Army)	$3,054,827	0.5%	Rank history: #40 in FY2022, #37 in FY2023, #51 in FY2024 and #37 in FY2025; up 9 since FY2020.
37	Koam Engineering Systems, Inc. Top agencies Navy (Department of the Navy)	$3,014,316	0.5%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
38	Low Voltage Wiring Ltd Top agencies Army (Department of the Army) Navy (Department of the Navy) DHA (Defense Health Agency)	$2,836,813	0.5%	Rank history: #36 in FY2022, #33 in FY2023, #39 in FY2024 and #30 in FY2025; down 10 since FY2020.
39	EXP U.S. Services Inc. Through EXP Federal Inc. Top agencies Army (Department of the Army) NSA (Department of Defense National Security Agency)	$2,423,144	0.4%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; down 20 since FY2020.
40	Chinook Systems Inc. Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$2,298,029	0.4%	Rank history: #14 in FY2022, #18 in FY2023, #10 in FY2024 and #21 in FY2025; down 13 since FY2020.
41	Twins Roofing, Incorporated Through Twins General Contractors, Inc. Top agencies DOJ (Department of Justice)	$2,292,739	0.4%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
42	Puyenpa Services, LLC Top agencies Navy (Department of the Navy)	$2,181,230	0.4%	Rank history: #22 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
43	Pitech Solutions Inc. Top agencies DHS (Department of Homeland Security)	$2,114,961	0.3%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
44	Integrated Security Solutions Inc. Top agencies Army (Department of the Army)	$1,947,880	0.3%	Rank history: not on the FY2022–FY2023 lists, #32 in FY2024 and #16 in FY2025; down 38 since FY2020.
45	RBT Electric Inc. Top agencies USAF (Department of the Air Force)	$1,859,681	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	Afognak Native Corporation Through Alutiiq Information Management, LLC Top agencies Navy (Department of the Navy)	$1,764,527	0.3%	Rank history: #47 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; down 25 since FY2020.
47	SNA Contracting LLC Top agencies USDA (Department of Agriculture)	$1,237,783	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
48	E-9 Enterprises, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$1,221,755	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	Trandes Corp Top agencies Navy (Department of the Navy)	$1,189,262	0.2%	Rank history: not on the FY2022 list, #85 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
50	Long Wave Inc. Top agencies USAF (Department of the Air Force)	$1,061,539	0.2%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
51	Credence Management Solutions Limited Liability Company Top agencies DHS (Department of Homeland Security)	$1,056,723	0.2%	Rank history: #52 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
52	Cutler Engineering & Technology Services LLC Top agencies Navy (Department of the Navy)	$957,770	0.2%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
53	Telos Corporation Top agencies USAF (Department of the Air Force)	$913,911	0.1%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
54	Computer Sites Inc. Top agencies USAF (Department of the Air Force)	$892,342	0.1%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; up 13 since FY2020.
55	Cccs International LLC Top agencies Army (Department of the Army)	$861,434	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Valkyrie Enterprises, LLC 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$796,586	0.1%	Rank history: #46 in FY2022, #52 in FY2023, #58 in FY2024 and #96 in FY2025; up 3 since FY2020.
57	Virginia Energy and Lighting, LLC Top agencies DHS (Department of Homeland Security)	$770,505	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	Centurum Inc. Through Centurum Information Technology Inc. Top agencies Navy (Department of the Navy)	$770,000	0.1%	Rank history: not on the FY2022 list, #68 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
59	Aleut Aerospace Engineering, LLC Top agencies USAF (Department of the Air Force)	$765,289	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Peopletec, Inc. Top agencies Navy (Department of the Navy)	$759,843	0.1%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
61	Kaya Associates, Inc. Top agencies Army (Department of the Army)	$731,748	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	South Bay EDC Inc. Top agencies Navy (Department of the Navy)	$678,707	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Arlington Capital Partners IV, L.P. Through Tyto Athene, LLC Top agencies USAF (Department of the Air Force)	$673,521	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Sidtek, LLC Top agencies Army (Department of the Army)	$665,280	0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
65	Great Plains Communications LLC Through Strantech LLC Top agencies USAF (Department of the Air Force)	$638,267	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Red River Technology LLC Top agencies VA (Department of Veterans Affairs)	$628,760	0.1%	Rank history: not on the FY2022–FY2025 lists; down 29 since FY2020.
67	Thundercat Technology, LLC Top agencies VA (Department of Veterans Affairs)	$624,332	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Serco Inc. Top agencies Navy (Department of the Navy)	$613,449	0.1%	Rank history: #51 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
69	Cambridge International Systems, Inc. Top agencies Navy (Department of the Navy)	$605,071	0.1%	Rank history: #73 in FY2022, #50 in FY2023, #93 in FY2024 and #29 in FY2025; new, not ranked in FY2020.
70	Inter-Op.net, Inc. Top agencies DHS (Department of Homeland Security)	$604,224	0.1%	Rank history: not on the FY2022 list, #91 in FY2023, not on the FY2024 list and #93 in FY2025; down 2 since FY2020.
71	Four Points Technology, L.L.C. Top agencies VA (Department of Veterans Affairs)	$579,737	0.1%	Rank history: #50 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
72	Armcorp Construction Inc. Top agencies VA (Department of Veterans Affairs)	$541,242	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Hyperion, Inc. Top agencies Army (Department of the Army)	$530,235	0.1%	Rank history: #68 in FY2022, #74 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
74	Kendall Fiber, LLC Top agencies DHS (Department of Homeland Security)	$498,652	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Trilogy Secured Services, L.l.c Top agencies DOJ (Department of Justice)	$475,730	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Quantum Technology Group LLC Top agencies USAF (Department of the Air Force)	$455,723	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	CACI International Inc. Through Caci, Inc. - Federal Top agencies Navy (Department of the Navy)	$448,727	0.1%	Rank history: not on the FY2022 list, #40 in FY2023, #23 in FY2024 and #12 in FY2025; new, not ranked in FY2020.
78	EAS Systems Inc. Top agencies DHS (Department of Homeland Security)	$448,711	0.1%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
79	Leidos Holdings, Inc. Through Leidos, Inc. Top agencies USAF (Department of the Air Force)	$416,536	0.1%	Rank history: not on the FY2022 list, #76 in FY2023, not on the FY2024 list and #52 in FY2025; down 49 since FY2020.
80	Mtnt Technical Services, LLC Top agencies Army (Department of the Army)	$409,940	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Security Install Solutions, Inc. Top agencies GSA (General Services Administration) DOI (Department of the Interior)	$409,470	0.1%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
82	Health Systems Informatics, Inc. Top agencies HHS (Department of Health and Human Services)	$406,186	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Siemens Government Technologies Inc. Top agencies Army (Department of the Army)	$399,219	0.1%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
84	Allison Electric, Inc. Top agencies VA (Department of Veterans Affairs)	$387,078	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Impact Electric Services, LLC Top agencies USDA (Department of Agriculture)	$380,131	0.1%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
86	Cusa Consulting LLC Top agencies DOT (Department of Transportation)	$352,256	0.1%	Rank history: #19 in FY2022, #12 in FY2023, #11 in FY2024 and #19 in FY2025; new, not ranked in FY2020.
87	Mem Contracting, Inc. Top agencies Army (Department of the Army)	$349,518	0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
88	Banning Contracting Services Inc. Top agencies VA (Department of Veterans Affairs)	$323,459	0.1%	Rank history: not on the FY2022–FY2025 lists; down 50 since FY2020.
89	Nais-Pragmatics JV LLC Top agencies CPSC (Consumer Product Safety Commission) USAF (Department of the Air Force)	$311,063	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	American Operations Corporation Top agencies VA (Department of Veterans Affairs)	$306,120	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	BAE Systems Technology Solutions & Services Inc. Top agencies Navy (Department of the Navy)	$285,940	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 32 since FY2020.
92	J & N Marketing, Inc. Top agencies DOI (Department of the Interior)	$278,824	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	CAE Inc. Through Elevate Healthcare, Inc. Top agencies USUHS (DOD Uniformed Services University of the Health Sciences)	$275,433	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Kaihonua LLC Top agencies DISA (Defense Information Systems Agency)	$273,071	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	G2I JBI LLC Top agencies USAF (Department of the Air Force)	$272,887	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Alutiiq Information Management, LLC Top agencies Navy (Department of the Navy)	$249,193	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Elit Sekyuriti Servis, OOO Top agencies DOS (Department of State)	$247,157	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Oakwood Controls Corp Top agencies USSOCOM (United States Special Operations Command)	$245,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	CB Contracting Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts)	$243,097	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Rgbs Enterprises Inc. Top agencies GSA (General Services Administration)	$240,956	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 363 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 $621 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 PSC N059 contractors in FY2021?

1. Johnson Controls Security Solutions LLC ($93.9M), 2. Serco North America (Holdings) Inc ($76.1M), 3. BAE Systems PLC ($31.7M), 4. Siemens Aktiengesellschaft ($28.2M), 5. Parsons Corporation ($24.4M), 6. Olgoonik Corporation ($22.9M), 7. Huntington Ingalls Industries, Inc. ($22.4M), 8. Xator LLC ($20.6M), 9. M.c. Dean, Inc. ($20.2M), 10. VT Milcom Inc. ($17.6M).

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