Top 100 Contractors in PSC H9: Other Quality, Test, Inspect Services, FY2021

Name: Top 100 Contractors in PSC H9: Other Quality, Test, Inspect Services, FY2021
Creator: GovTribe

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

The top 10 won 73% of FY2021 PSC H9 contract dollars

Contract obligations: $473,650,392 Net of deobligations, by contracts coded PSC H9 or a code under it
Contractors: 675 Parent companies with an obligation
Largest contractor: RTX Corporation $160 million, 32.3% 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	RTX Corporation 3 awardees, including Raytheon Company and Hamilton Sundstrand Corporation Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army) USAF (Department of the Air Force)	$159,640,726	32.3%	Rank history: #5 in FY2022, #4 in FY2023, #2 in FY2024 and #2 in FY2025; up 66 since FY2020.
2	Lockheed Martin Corporation 3 awardees, including Sikorsky Aircraft Corporation and Lockheed Martin Coherent Technologies, Inc. Top agencies MDA (DOD Missile Defense Agency) DOJ (Department of Justice) DOT (Department of Transportation)	$42,066,034	8.5%	Rank history: #2 in FY2022, #2 in FY2023, #10 in FY2024 and #10 in FY2025; unchanged since FY2020.
3	L3Harris Technologies, Inc. 2 awardees, including L3Harris Interstate Electronics Corporation and Wescam Inc. Top agencies Navy (Department of the Navy) DOJ (Department of Justice)	$39,670,431	8.0%	Rank history: #1 in FY2022, #3 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
4	Johnson Controls Security Solutions LLC 5 awardees, including Johnson Controls Government Systems, LLC, Johnson Controls, Inc. and Johnson Controls Fire Protection LP Top agencies Army (Department of the Army) DFAS (Defense Finance and Accounting Service) VA (Department of Veterans Affairs)	$24,731,557	5.0%	Rank history: #3 in FY2022, #5 in FY2023, #12 in FY2024 and not on the FY2025 list; up 3 since FY2020.
5	Perspecta Inc. Through Peraton Enterprise Solutions LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$23,016,178	4.7%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
6	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top agencies USDA (Department of Agriculture)	$19,850,300	4.0%	Rank history: #4 in FY2022, #13 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
7	HP Enterprise Services LLC 4 awardees, including Peraton Inc. and Peraton Enterprise Solutions LLC Top agencies Navy (Department of the Navy) DCSA (Defense Counterintelligence and Security Agency)	$14,291,777	2.9%	Rank history: #8 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
8	Honeywell International Inc. 3 awardees, including Vindicator Technologies, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$13,957,727	2.8%	Rank history: #10 in FY2022, #8 in FY2023, #17 in FY2024 and #12 in FY2025; up 2 since FY2020.
9	Man-Machine Systems Assessment (Msa), Incorporated Top agencies Army (Department of the Army)	$12,409,001	2.5%	Rank history: #6 in FY2022, #7 in FY2023, #6 in FY2024 and #6 in FY2025; down 1 since FY2020.
10	Psi Services LLC Through Performance Assessment Network, Inc. Top agencies DHS (Department of Homeland Security)	$8,832,598	1.8%	Rank history: #12 in FY2022, #25 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
11	Sparksoft Corporation Top agencies HHS (Department of Health and Human Services)	$8,548,106	1.7%	Rank history: #9 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
12	Predictant, LLC Top agencies USAF (Department of the Air Force)	$8,484,390	1.7%	Rank history: #7 in FY2022, #10 in FY2023, #8 in FY2024 and #77 in FY2025; up 1 since FY2020.
13	Joint Research and Development LLC Top agencies Army (Department of the Army)	$8,128,589	1.6%	Rank history: #13 in FY2022, #14 in FY2023, #11 in FY2024 and #15 in FY2025; up 18 since FY2020.
14	AECOM 2 awardees, including AECOM Usa, Inc. Top agencies Navy (Department of the Navy)	$4,994,350	1.0%	Rank history: #40 in FY2022, #43 in FY2023, #46 in FY2024 and #30 in FY2025; up 19 since FY2020.
15	BMA Technical Services, Inc. Top agencies Army (Department of the Army)	$4,332,944	0.9%	Rank history: #24 in FY2022, #29 in FY2023, #26 in FY2024 and #24 in FY2025; down 4 since FY2020.
16	Centerpoint Energy, Inc. Through Energy Systems Group, LLC Top agencies Army (Department of the Army)	$4,057,909	0.8%	Rank history: #20 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
17	System Dynamics International Incorporated Top agencies USAF (Department of the Air Force)	$3,572,737	0.7%	Rank history: #15 in FY2022, #19 in FY2023, #15 in FY2024 and #29 in FY2025; down 3 since FY2020.
18	Dark Wolf Solutions, LLC Top agencies USAF (Department of the Air Force)	$3,545,278	0.7%	Rank history: #14 in FY2022, #11 in FY2023, #7 in FY2024 and #8 in FY2025; up 12 since FY2020.
19	Vista Defense Technologies, LLC Top agencies Army (Department of the Army)	$3,214,682	0.7%	Rank history: #18 in FY2022, #26 in FY2023, #21 in FY2024 and #18 in FY2025; new, not ranked in FY2020.
20	SRS Battelle JV, LLC Top agencies Army (Department of the Army)	$2,921,741	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
21	Level 3 Associates, LLC Top agencies Army (Department of the Army)	$2,399,863	0.5%	Rank history: #47 in FY2022, #36 in FY2023, #56 in FY2024 and not on the FY2025 list; up 8 since FY2020.
22	Markon LLC Top agencies DOI (Department of the Interior)	$2,375,236	0.5%	Rank history: #23 in FY2022, #45 in FY2023, #88 in FY2024 and not on the FY2025 list; down 4 since FY2020.
23	Alaska Testlab, LLC Top agencies Army (Department of the Army)	$2,327,493	0.5%	Rank history: #43 in FY2022, not on the FY2023–FY2024 lists and #48 in FY2025; new, not ranked in FY2020.
24	Tic Security, LLC Top agencies Treasury (Department of the Treasury)	$2,010,480	0.4%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
25	Smart Munitions Expert Solutions, Inc. Top agencies USAF (Department of the Air Force)	$1,894,366	0.4%	Rank history: #21 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
26	Nelbud Services LLC Top agencies WHS (DOD Washington Headquarters Service)	$1,515,580	0.3%	Rank history: #35 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
27	Turning Point Global Solutions LLC Top agencies HHS (Department of Health and Human Services)	$1,464,115	0.3%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
28	Agilent Technologies, Inc. Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$1,297,139	0.3%	Rank history: #28 in FY2022, #34 in FY2023 and not on the FY2024–FY2025 lists; up 117 since FY2020.
29	Simis, Inc. Top agencies DHS (Department of Homeland Security)	$1,295,687	0.3%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
30	Hamilton Associates Inc. Top agencies DOE (Department of Energy) Navy (Department of the Navy)	$1,245,759	0.3%	Rank history: #34 in FY2022, #40 in FY2023, #40 in FY2024 and #53 in FY2025; up 2 since FY2020.
31	AD HOC Research Associates LLC Top agencies Army (Department of the Army)	$1,232,359	0.2%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
32	The Mitre Corporation Top agencies DHS (Department of Homeland Security)	$1,150,000	0.2%	Rank history: not on the FY2022 list, #27 in FY2023, #47 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
33	Intertek Group PLC 3 awardees, including Intertek USA Inc. and Intertek Testing Services NA, Inc. Top agencies USDA (Department of Agriculture) Army (Department of the Army)	$1,090,416	0.2%	Rank history: not on the FY2022–FY2025 lists; up 316 since FY2020.
34	Accura Engineering and Consulting Services, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,050,449	0.2%	Rank history: #49 in FY2022, #38 in FY2023, #45 in FY2024 and #42 in FY2025; unchanged since FY2020.
35	De La Fuente Construction, Inc. Top agencies Army (Department of the Army)	$866,202	0.2%	Rank history: #45 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
36	Hurtvet Subcontracting, Inc. Top agencies VA (Department of Veterans Affairs)	$812,235	0.2%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
37	Partner Forces LLC Top agencies DHS (Department of Homeland Security)	$794,285	0.2%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
38	LJB Inc. Top agencies WHS (DOD Washington Headquarters Service)	$782,201	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Winergy LLC Top agencies VA (Department of Veterans Affairs)	$720,957	0.1%	Rank history: #55 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
40	Grafik Industries, Ltd. Top agencies DOL (Department of Labor)	$673,209	0.1%	Rank history: #33 in FY2022, not on the FY2023 list, #94 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
41	Global Systems Technologies, LLC Top agencies DHS (Department of Homeland Security)	$667,817	0.1%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
42	Maryland Elevator Services, Inc. Top agencies VA (Department of Veterans Affairs)	$659,624	0.1%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; up 13 since FY2020.
43	Dirac Solutions, Inc. Top agencies DOE (Department of Energy)	$658,937	0.1%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.
44	Ameresco Inc. Through Ameresco Select, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$639,320	0.1%	Rank history: not on the FY2022–FY2025 lists; up 49 since FY2020.
45	Gstek, Inc. Top agencies Navy (Department of the Navy)	$622,477	0.1%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
46	Siemens Aktiengesellschaft 2 awardees, including Siemens Industry Inc. and Siemens Government Technologies Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) DHS (Department of Homeland Security)	$620,523	0.1%	Rank history: #77 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; up 51 since FY2020.
47	HGS Engineering Inc. Top agencies VA (Department of Veterans Affairs)	$595,146	0.1%	Rank history: #39 in FY2022, not on the FY2023–FY2024 lists and #55 in FY2025; up 15 since FY2020.
48	Enapay, LLC Top agencies VA (Department of Veterans Affairs)	$582,550	0.1%	Rank history: #65 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; up 16 since FY2020.
49	Codan Limited Through Daniels Electronics Ltd Top agencies DOI (Department of the Interior)	$570,611	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Cotecna Inspection Inc. Top agencies USDA (Department of Agriculture)	$542,931	0.1%	Rank history: #26 in FY2022, #56 in FY2023, #37 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
51	Professional Environmental Engineers, Inc. Top agencies Army (Department of the Army)	$502,564	0.1%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; up 22 since FY2020.
52	Westwind Computer Products, Inc. Top agencies DOT (Department of Transportation)	$479,991	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Unified Industries Inc. Top agencies Navy (Department of the Navy)	$465,168	0.1%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
54	Gartner, Inc. Top agencies DOS (Department of State)	$461,601	0.1%	Rank history: #25 in FY2022, #50 in FY2023, #44 in FY2024 and #49 in FY2025; down 14 since FY2020.
55	Western Sales & Testing of Amarillo Inc. Top agencies DLA (Defense Logistics Agency)	$431,772	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Phigenics LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$429,585	0.1%	Rank history: #19 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
57	Cogeco (Private) Limited Top agencies DLA (Defense Logistics Agency)	$376,470	0.1%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
58	Applied Research Associates, Inc. Top agencies USDA (Department of Agriculture)	$374,695	0.1%	Rank history: not on the FY2022 list, #12 in FY2023, #4 in FY2024 and #3 in FY2025; new, not ranked in FY2020.
59	National Door Service, Inc. Top agencies Navy (Department of the Navy)	$366,324	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	MSS Services, Inc. Top agencies DHS (Department of Homeland Security)	$360,705	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Jacobs Engineering Group Inc. Through Ch2M Hill - HDR JV Top agencies Army (Department of the Army)	$355,804	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Ama Consulting LLC Top agencies ED (Department of Education)	$354,112	0.1%	Rank history: #44 in FY2022, #63 in FY2023 and not on the FY2024–FY2025 lists; down 43 since FY2020.
63	WEX Inc. Top agencies USDA (Department of Agriculture)	$345,966	0.1%	Rank history: #78 in FY2022, not on the FY2023 list, #64 in FY2024 and #52 in FY2025; up 35 since FY2020.
64	Quality Lockout LLC Top agencies Army (Department of the Army)	$343,273	0.1%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
65	Environmental Health & Safety Services, Inc. Top agencies VA (Department of Veterans Affairs)	$343,200	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Apsi Construction Management Top agencies DOI (Department of the Interior) GSA (General Services Administration)	$338,160	0.1%	Rank history: not on the FY2022–FY2025 lists; up 140 since FY2020.
67	Valogic Bio, LLC Top agencies HHS (Department of Health and Human Services)	$334,800	0.1%	Rank history: #38 in FY2022, #35 in FY2023, #50 in FY2024 and #33 in FY2025; new, not ranked in FY2020.
68	Hdr, Inc. 2 awardees, including HDR Engineering Inc. Top agencies Army (Department of the Army)	$332,876	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Scitech Services Inc. Top agencies Army (Department of the Army)	$330,241	0.1%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
70	Venergy Group LLC Top agencies VA (Department of Veterans Affairs)	$328,639	0.1%	Rank history: #80 in FY2022, #98 in FY2023, #87 in FY2024 and #95 in FY2025; up 1 since FY2020.
71	Geotechnology Holdings, Inc. Through UES Professional Solutions 25, LLC Top agencies Army (Department of the Army)	$328,335	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Rini Technologies, Inc. Top agencies USSOCOM (United States Special Operations Command)	$327,450	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Sensors Inc. Top agencies EPA (Environmental Protection Agency)	$325,000	0.1%	Rank history: not on the FY2022 list, #94 in FY2023, not on the FY2024 list and #71 in FY2025; up 69 since FY2020.
74	Texas Research International Inc. Through Tri Airtesting Inc. Top agencies Navy (Department of the Navy)	$317,661	0.1%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
75	Daebo Industrial Co. Ltd. Through Daebo Engineering & Construction Co., Ltd. Top agencies Army (Department of the Army)	$307,342	0.1%	Rank history: #84 in FY2022, #81 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
76	Goss Service Associates LLC Top agencies VA (Department of Veterans Affairs)	$302,112	0.1%	Rank history: #75 in FY2022, not on the FY2023 list, #80 in FY2024 and #94 in FY2025; new, not ranked in FY2020.
77	Tribologik Corp Top agencies Navy (Department of the Navy)	$282,555	0.1%	Rank history: not on the FY2022 list, #30 in FY2023, #32 in FY2024 and #27 in FY2025; up 6 since FY2020.
78	Alaska Stairlift & Elevator LLC Top agencies Army (Department of the Army)	$278,059	0.1%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
79	The Ohio State University Top agencies NASA (National Aeronautics and Space Administration)	$277,256	0.1%	Rank history: not on the FY2022–FY2025 lists; up 176 since FY2020.
80	Chemtron Supply, LLC Top agencies USAF (Department of the Air Force)	$277,086	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Media Plumbing & Heating Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$274,467	0.1%	Rank history: #86 in FY2022, not on the FY2023–FY2024 lists and #84 in FY2025; down 4 since FY2020.
82	Alsea Geospatial, Inc. Top agencies USDA (Department of Agriculture)	$268,227	0.1%	Rank history: not on the FY2022–FY2025 lists; down 55 since FY2020.
83	Petroleum Systems & Maintenance, Inc. Top agencies VA (Department of Veterans Affairs)	$267,660	0.1%	Rank history: not on the FY2022–FY2025 lists; up 181 since FY2020.
84	Battelle Memorial Institute Top agencies EPA (Environmental Protection Agency)	$259,244	0.1%	Rank history: not on the FY2022 list, #60 in FY2023, #36 in FY2024 and #38 in FY2025; down 14 since FY2020.
85	National Medical Services, Inc. Top agencies HHS (Department of Health and Human Services)	$250,000	0.1%	Rank history: #85 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; up 18 since FY2020.
86	Innovative Life Safety Solutions, LLC Top agencies VA (Department of Veterans Affairs)	$243,335	<0.1%	Rank history: not on the FY2022–FY2024 lists and #98 in FY2025; unchanged since FY2020.
87	Transcat, Inc. Top agencies DHS (Department of Homeland Security)	$231,750	<0.1%	Rank history: #87 in FY2022, not on the FY2023 list, #100 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
88	Calspan Corporation Top agencies DOT (Department of Transportation)	$229,026	<0.1%	Rank history: #50 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
89	Las Americas Petroleum Services Corporation Top agencies VA (Department of Veterans Affairs)	$221,807	<0.1%	Rank history: #59 in FY2022, not on the FY2023 list, #73 in FY2024 and #69 in FY2025; up 10 since FY2020.
90	Johnson, Mirmiran & Thompson, Inc. Top agencies DOI (Department of the Interior)	$215,470	<0.1%	Rank history: not on the FY2022 list, #90 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
91	Newton Design, LLC Top agencies DHS (Department of Homeland Security)	$211,929	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 66 since FY2020.
92	Korea Inspection System Corporation Top agencies Army (Department of the Army)	$206,982	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
93	Bratslavsky Consulting Engineers, Inc. Top agencies DHS (Department of Homeland Security) GSA (General Services Administration)	$202,743	<0.1%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
94	Construction Testing Services Top agencies DOI (Department of the Interior)	$200,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	RJY Group LLC Top agencies VA (Department of Veterans Affairs)	$199,956	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 60 since FY2020.
96	Industrial Economics Inc. Top agencies DHS (Department of Homeland Security)	$199,554	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
97	Seneca Global Services LLC Top agencies USAF (Department of the Air Force)	$199,410	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
98	Credere Associates, LLC Top agencies Navy (Department of the Navy)	$198,835	<0.1%	Rank history: not on the FY2022–FY2023 lists, #42 in FY2024 and #76 in FY2025; up 3 since FY2020.
99	Bowtie Engineering, LLC Top agencies HHS (Department of Health and Human Services)	$196,354	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	The Brink's Company Top agencies DOS (Department of State)	$195,025	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.

Show 75 more

100 of 675 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC H9

Code	Net obligations	Largest contractor
H999 Other Quality Control, Testing and Inspection Services: Miscellaneous	$58,426,399	Perspecta Inc.
H963 Other Quality Control, Testing and Inspection Services: Alarm, Signal, and Security Detection Systems	$11,218,616	Dark Wolf Solutions, LLC
H965 Other Quality Control, Testing and Inspection Services: Medical, Dental, and Veterinary Equipment and Supplies	$2,617,311	Winergy LLC
H959 Other Quality Control, Testing and Inspection Services: Electrical and Electronic Equipment Components	$2,452,139	Codan Limited
H966 Other Quality Control, Testing and Inspection Services: Instruments and Laboratory Equipment	$2,363,038	Dirac Solutions, Inc.
H946 Other Quality Control, Testing and Inspection Services: Water Purification and Sewage Treatment Equipment	$2,036,635	HGS Engineering Inc.

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 $493 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 H9 contractors in FY2021?

1. RTX Corporation ($160M), 2. Lockheed Martin Corporation ($42.1M), 3. L3Harris Technologies, Inc. ($39.7M), 4. Johnson Controls Security Solutions LLC ($24.7M), 5. Perspecta Inc. ($23M), 6. CGI Technologies and Solutions Inc. ($19.9M), 7. HP Enterprise Services LLC ($14.3M), 8. Honeywell International Inc. ($14M), 9. Man-Machine Systems Assessment (Msa), Incorporated ($12.4M), 10. Psi Services LLC ($8.83M).

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