Top 100 Contractors in PSC H3: Inspection Services, FY2021

Name: Top 100 Contractors in PSC H3: Inspection Services, FY2021
Creator: GovTribe

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

The top 10 won 37% of FY2021 PSC H3 contract dollars

Contract obligations: $96,594,147 Net of deobligations, by contracts coded PSC H3 or a code under it
Contractors: 857 Parent companies with an obligation
Largest contractor: Versar Inc. $10.1 million, 7.3% 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	Versar Inc. Top agencies Army (Department of the Army)	$10,079,216	7.3%	Rank history: #2 in FY2022, #3 in FY2023, #2 in FY2024 and not on the FY2025 list; unchanged since FY2020.
2	Oneida Engineering Solutions LLC Top agencies DOJ (Department of Justice)	$9,895,914	7.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
3	AECOM Through AECOM Technical Services, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$9,043,070	6.5%	Rank history: #3 in FY2022, #4 in FY2023, #19 in FY2024 and not on the FY2025 list; down 1 since FY2020.
4	Building Inspection Service, Inc. Top agencies DHS (Department of Homeland Security)	$3,959,971	2.9%	Rank history: #9 in FY2022, #34 in FY2023 and not on the FY2024–FY2025 lists; up 62 since FY2020.
5	Johnson, Mirmiran & Thompson, Inc. Top agencies DOI (Department of the Interior)	$3,475,024	2.5%	Rank history: #60 in FY2022, #40 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
6	Martinfederal Consulting, LLC Top agencies Army (Department of the Army)	$3,474,214	2.5%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
7	MYI Limited Top agencies EXIM (Export Import Bank of the US)	$3,225,000	2.3%	Rank history: #4 in FY2022, #6 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
8	Mountain Horse LLC Top agencies DHS (Department of Homeland Security)	$3,083,190	2.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
9	Project Solutions, Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$2,517,786	1.8%	Rank history: #39 in FY2022, #5 in FY2023, #7 in FY2024 and #4 in FY2025; up 7 since FY2020.
10	AFG Group Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$2,455,348	1.8%	Rank history: #7 in FY2022, #71 in FY2023, #29 in FY2024 and #37 in FY2025; unchanged since FY2020.
11	Jacobs Engineering Group Inc. 2 awardees, including Amentum Technology, Inc. Top agencies EPA (Environmental Protection Agency)	$2,155,509	1.6%	Rank history: #22 in FY2022, #25 in FY2023, #60 in FY2024 and not on the FY2025 list; up 32 since FY2020.
12	Alpha Construction and Engineering Corporation Top agencies DOI (Department of the Interior)	$2,076,049	1.5%	Rank history: #97 in FY2022, #65 in FY2023, not on the FY2024 list and #9 in FY2025; up 28 since FY2020.
13	Apsi Construction Management Top agencies DOI (Department of the Interior)	$1,945,489	1.4%	Rank history: #53 in FY2022, #29 in FY2023, not on the FY2024 list and #58 in FY2025; up 182 since FY2020.
14	NA Alii Consulting & Sales LLC Top agencies WHS (DOD Washington Headquarters Service)	$1,757,085	1.3%	Rank history: #13 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
15	R. S. Means Company LLC 3 awardees, including The Gordian Group, Inc. and R.s. Means Company LLC Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$1,599,503	1.2%	Rank history: #19 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
16	Certified Technical Experts, Inc. Top agencies HHS (Department of Health and Human Services)	$1,473,554	1.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
17	Lockheed Martin Corporation 2 awardees Top agencies Navy (Department of the Navy)	$1,458,863	1.1%	Rank history: #16 in FY2022, #8 in FY2023, #4 in FY2024 and #1 in FY2025; new, not ranked in FY2020.
18	Hurtvet Subcontracting, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) DOI (Department of the Interior)	$1,362,930	1.0%	Rank history: #11 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
19	Ardent Management Consulting, LLC Top agencies SSA (Social Security Administration)	$1,259,511	0.9%	Rank history: #21 in FY2022, not on the FY2023 list, #23 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
20	Construction Support Solutions LLC Top agencies DHS (Department of Homeland Security)	$1,104,617	0.8%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; up 33 since FY2020.
21	Interspec, LLC Top agencies DLA (Defense Logistics Agency)	$957,297	0.7%	Rank history: #31 in FY2022, #43 in FY2023, #10 in FY2024 and #66 in FY2025; new, not ranked in FY2020.
22	Goldenwolf - Crawford Consulting Services Joint Venture LLC Top agencies Army (Department of the Army)	$941,702	0.7%	Rank history: #10 in FY2022, not on the FY2023 list, #57 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
23	Procon Consulting LLC Top agencies NASA (National Aeronautics and Space Administration)	$914,237	0.7%	Rank history: #5 in FY2022, #2 in FY2023, #3 in FY2024 and #6 in FY2025; new, not ranked in FY2020.
24	PMA Associates, Inc. Top agencies HUD (Department of Housing and Urban Development)	$876,208	0.6%	Rank history: #28 in FY2022, #35 in FY2023, not on the FY2024 list and #24 in FY2025; new, not ranked in FY2020.
25	Advanced Integrated Technologies, LLC Top agencies Navy (Department of the Navy)	$827,048	0.6%	Rank history: #17 in FY2022, #18 in FY2023, #15 in FY2024 and #11 in FY2025; down 11 since FY2020.
26	American Bureau of Shipping Top agencies Commerce (Department of Commerce) DOT (Department of Transportation) Navy (Department of the Navy)	$825,509	0.6%	Rank history: #52 in FY2022, #78 in FY2023, #31 in FY2024 and #26 in FY2025; up 1 since FY2020.
27	Optimum Low Voltage LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DHS (Department of Homeland Security)	$824,943	0.6%	Rank history: #33 in FY2022, #36 in FY2023, #41 in FY2024 and #72 in FY2025; up 4 since FY2020.
28	ABT Global LLC Top agencies HHS (Department of Health and Human Services)	$819,572	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	Cherokee Nation Aerospace and Defense, L.L.C. Top agencies Army (Department of the Army)	$814,765	0.6%	Rank history: #23 in FY2022, #38 in FY2023, #55 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
30	Federal Resources Supply Company Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$812,591	0.6%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 333 since FY2020.
31	Jenson Fire Protection Inc. Top agencies Army (Department of the Army)	$776,950	0.6%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
32	KNK Engineering Consulting Corp. Top agencies DLA (Defense Logistics Agency)	$763,232	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	Johnson Controls Security Solutions LLC 8 awardees, including Johnson Controls Fire Protection LP, Johnson Controls S.P.A. and Johnson Controls Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DHS (Department of Homeland Security)	$708,951	0.5%	Rank history: #44 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 51 since FY2020.
34	Food Safety Net Services, Ltd. Top agencies USDA (Department of Agriculture)	$661,835	0.5%	Rank history: #14 in FY2022, #16 in FY2023, #14 in FY2024 and #33 in FY2025; new, not ranked in FY2020.
35	Fairbanks Morse LLC Top agencies Army (Department of the Army)	$659,960	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Institute for Building Technology and Safety Top agencies DHS (Department of Homeland Security)	$611,756	0.4%	Rank history: #6 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
37	Skyquest Aviation LLC Top agencies USAF (Department of the Air Force)	$582,818	0.4%	Rank history: #46 in FY2022, #49 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
38	Mitig Company, LLC Top agencies DOE (Department of Energy)	$571,215	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Hyperion Biotechnology, Inc. Top agencies VA (Department of Veterans Affairs)	$568,180	0.4%	Rank history: #65 in FY2022, not on the FY2023 list, #46 in FY2024 and #32 in FY2025; up 12 since FY2020.
40	Universal Consultants Incorporated Top agencies VA (Department of Veterans Affairs)	$547,394	0.4%	Rank history: #71 in FY2022, not on the FY2023 list, #86 in FY2024 and not on the FY2025 list; up 58 since FY2020.
41	Triad Logistics Services Corporation Top agencies USAF (Department of the Air Force)	$542,122	0.4%	Rank history: #48 in FY2022, #62 in FY2023, #77 in FY2024 and not on the FY2025 list; down 5 since FY2020.
42	Greenefficient Inc. Top agencies VA (Department of Veterans Affairs)	$491,944	0.4%	Rank history: #54 in FY2022, #57 in FY2023, #58 in FY2024 and #94 in FY2025; down 7 since FY2020.
43	Media Plumbing & Heating Inc. Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs) Army (Department of the Army)	$471,782	0.3%	Rank history: #68 in FY2022, #73 in FY2023, #79 in FY2024 and #82 in FY2025; up 6 since FY2020.
44	Esperanza International Services Southern Africa (PTY) Ltd Through Intertek Testing Services (South Africa) (Pty) Ltd Top agencies USAID (US Agency for International Development)	$471,500	0.3%	Rank history: not on the FY2022 list, #30 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
45	Carcongroup Engineering PSC Top agencies DHS (Department of Homeland Security)	$465,098	0.3%	Rank history: #8 in FY2022, #58 in FY2023, #42 in FY2024 and #23 in FY2025; down 1 since FY2020.
46	PN Automation Inc. Top agencies HHS (Department of Health and Human Services)	$455,717	0.3%	Rank history: #100 in FY2022, not on the FY2023 list, #99 in FY2024 and #91 in FY2025; down 7 since FY2020.
47	Acco Engineered Systems, Inc. Top agencies VA (Department of Veterans Affairs)	$452,304	0.3%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; down 21 since FY2020.
48	Industrial Supply Co Inc. Top agencies USAF (Department of the Air Force)	$422,605	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	Consorzio S&T Services & Technologies Group Top agencies Army (Department of the Army)	$412,920	0.3%	Rank history: #62 in FY2022, #75 in FY2023, #71 in FY2024 and #57 in FY2025; down 3 since FY2020.
50	Magadia Consulting Inc. Top agencies Army (Department of the Army)	$400,689	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	Institute for Environmental Health Inc. Top agencies USDA (Department of Agriculture)	$400,000	0.3%	Rank history: #47 in FY2022, #11 in FY2023, #11 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
52	American Engineering Corporation Top agencies Army (Department of the Army)	$372,828	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Markon LLC Top agencies DOI (Department of the Interior)	$365,296	0.3%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
54	Pyramid Enterprises, Inc. Top agencies DOI (Department of the Interior)	$354,106	0.3%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.
55	Arcadis N.V. Through Arcadis Consulting (Uk) Limited Top agencies USAF (Department of the Air Force)	$333,010	0.2%	Rank history: not on the FY2022–FY2025 lists; down 30 since FY2020.
56	Trane U.S. Inc. 2 awardees, including Ingersoll-Rand Company Top agencies Treasury (Department of the Treasury) VA (Department of Veterans Affairs)	$332,926	0.2%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
57	PVB Fabrications, Inc. Top agencies USAF (Department of the Air Force)	$321,785	0.2%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; up 379 since FY2020.
58	PAZ Oil Company Limited Top agencies DOS (Department of State)	$320,450	0.2%	Rank history: #26 in FY2022, #56 in FY2023, #72 in FY2024 and #68 in FY2025; up 57 since FY2020.
59	Davidson Brown, Inc. Top agencies DHS (Department of Homeland Security)	$319,472	0.2%	Rank history: #30 in FY2022, not on the FY2023 list, #35 in FY2024 and not on the FY2025 list; up 5 since FY2020.
60	Ibex It Business Experts LLC Top agencies HHS (Department of Health and Human Services)	$316,149	0.2%	Rank history: #84 in FY2022, #97 in FY2023, #90 in FY2024 and not on the FY2025 list; up 20 since FY2020.
61	Securityhunter, Inc. Top agencies SSA (Social Security Administration)	$311,211	0.2%	Rank history: #77 in FY2022, #88 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
62	Mark V Lodge Inc. Top agencies Navy (Department of the Navy)	$304,383	0.2%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
63	Fluid Solutions LLC Top agencies DOS (Department of State)	$303,664	0.2%	Rank history: not on the FY2022–FY2025 lists; up 76 since FY2020.
64	Hill International, Inc. Top agencies DOI (Department of the Interior)	$300,538	0.2%	Rank history: not on the FY2022–FY2025 lists; up 99 since FY2020.
65	All Native Synergies Company Top agencies DOS (Department of State)	$298,048	0.2%	Rank history: #61 in FY2022, #67 in FY2023, #64 in FY2024 and not on the FY2025 list; down 37 since FY2020.
66	Tekton CC, LLC Top agencies VA (Department of Veterans Affairs)	$295,005	0.2%	Rank history: not on the FY2022–FY2025 lists; up 144 since FY2020.
67	Caldaia Controls LLC Top agencies VA (Department of Veterans Affairs)	$293,308	0.2%	Rank history: #76 in FY2022, not on the FY2023 list, #94 in FY2024 and #89 in FY2025; up 42 since FY2020.
68	Genco Systems Inc. Top agencies DOI (Department of the Interior)	$291,528	0.2%	Rank history: #32 in FY2022, not on the FY2023 list, #17 in FY2024 and #48 in FY2025; down 13 since FY2020.
69	Scriptpro LLC Through Scriptpro USA Inc. Top agencies VA (Department of Veterans Affairs)	$287,394	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Total Environmental Concepts, Inc. Top agencies USAF (Department of the Air Force)	$286,790	0.2%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
71	Bratslavsky Consulting Engineers, Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$281,818	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Helena Aircraft Inc. Top agencies USDA (Department of Agriculture)	$275,000	0.2%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
73	RTX Corporation 3 awardees, including Arinc Incorporated and Goodrich Corporation Top agencies DOT (Department of Transportation) Navy (Department of the Navy)	$274,410	0.2%	Rank history: not on the FY2022–FY2025 lists; down 52 since FY2020.
74	Southern Aire Contracting, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$272,294	0.2%	Rank history: #92 in FY2022, not on the FY2023 list, #98 in FY2024 and #90 in FY2025; up 32 since FY2020.
75	Barclay Water Treatment Company Inc Through Barclay Water Management, Inc. Top agencies VA (Department of Veterans Affairs) Treasury (Department of the Treasury)	$271,229	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Perk Company, Inc. Top agencies DOI (Department of the Interior)	$271,136	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	Blue Yonder Inc. Top agencies VA (Department of Veterans Affairs)	$262,316	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	LBT Diagnostic Radiation Physics Consulting Ltd Top agencies VA (Department of Veterans Affairs)	$259,279	0.2%	Rank history: not on the FY2022–FY2023 lists, #78 in FY2024 and #61 in FY2025; up 190 since FY2020.
79	Board of Governers State University System of Florida Through Florida International University Top agencies NASA (National Aeronautics and Space Administration)	$251,000	0.2%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
80	RJK Construction LLC Top agencies USDA (Department of Agriculture)	$250,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Pacificmark Construction Corp Top agencies USDA (Department of Agriculture)	$250,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Robert and Company Top agencies DLA (Defense Logistics Agency)	$249,764	0.2%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
83	New Horizon Design and Construction Management Company Limited Top agencies Army (Department of the Army)	$241,689	0.2%	Rank history: not on the FY2022–FY2025 lists; down 35 since FY2020.
84	Pacific Coast Contracting Group Top agencies VA (Department of Veterans Affairs)	$240,851	0.2%	Rank history: not on the FY2022–FY2023 lists, #56 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
85	Panacea Construction Group LLC Top agencies VA (Department of Veterans Affairs)	$240,405	0.2%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
86	SGI Global LLC Top agencies National Gallery of Art	$238,000	0.2%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
87	Ehpro Custom Fabrication, LLC Top agencies USAF (Department of the Air Force)	$235,406	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Life Safety Services LLC Top agencies VA (Department of Veterans Affairs)	$233,844	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Smiths Group PLC Through Smiths Detection Inc. Top agencies DHS (Department of Homeland Security) EPA (Environmental Protection Agency)	$232,032	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Krueger-Gilbert Health Physics, LLC Top agencies VA (Department of Veterans Affairs)	$230,027	0.2%	Rank history: #96 in FY2022, not on the FY2023 list, #97 in FY2024 and not on the FY2025 list; up 70 since FY2020.
91	Trident Engineering & Inspection Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$224,064	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Healthwest LLC Top agencies DHA (Defense Health Agency)	$223,493	0.2%	Rank history: #86 in FY2022, #95 in FY2023, #93 in FY2024 and #79 in FY2025; up 49 since FY2020.
93	Mount Airey Group LLC Top agencies DOS (Department of State)	$219,473	0.2%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
94	Goshawk, LLC Top agencies DLA (Defense Logistics Agency)	$219,383	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Elbit Systems Ltd Through Elbitamerica, Inc. Top agencies DOT (Department of Transportation)	$218,736	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Criterion Laboratories Inc. Top agencies VA (Department of Veterans Affairs)	$216,495	0.2%	Rank history: not on the FY2022–FY2025 lists; up 11 since FY2020.
97	Triple S Termite & Pest Control Inc. Top agencies WHS (DOD Washington Headquarters Service)	$216,100	0.2%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
98	Spectrum Electrical Services, Inc. Top agencies DOS (Department of State)	$211,634	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Fourtune 4, Inc. Top agencies VA (Department of Veterans Affairs)	$211,097	0.2%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
100	RJY Group LLC Top agencies VA (Department of Veterans Affairs)	$209,721	0.2%	Rank history: not on the FY2022–FY2023 lists, #50 in FY2024 and not on the FY2025 list; up 34 since FY2020.

Show 75 more

100 of 857 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC H3

Code	Net obligations	Largest contractor
H356 Inspection and Laboratory Services (except medical/dental): Construction and Building Materials	$15,141,525	Johnson, Mirmiran & Thompson, Inc.
H359 Inspection and Laboratory Services (except medical/dental): Electrical and Electronic Equipment Components	$11,323,993	Oneida Engineering Solutions LLC
H391 Inspection and Laboratory Services (except medical/dental): Fuels, Lubricants, Oils, and Waxes	$7,077,464	Martinfederal Consulting, LLC
H312 Inspection and Laboratory Services (except medical/dental): Fire Control Equipment	$6,326,449	Cherokee Nation Aerospace and Defense, L.L.C.
H370 Inspection and Laboratory Services (except medical/dental): Automatic Data Processing Equipment (Including Firmware), Software, Supplies and Support Equipment	$5,661,267	R. S. Means Company LLC
H342 Inspection and Laboratory Services (except medical/dental): Fire Fighting, Rescue, and Safety Equipment; and Environmental Protection Equipment and Materials	$3,478,784	Hurtvet Subcontracting, Inc.
H363 Inspection and Laboratory Services (except medical/dental): Alarm, Signal, and Security Detection Systems	$3,245,857	Consorzio S&T Services & Technologies Group
H366 Inspection and Laboratory Services (except medical/dental): Instruments and Laboratory Equipment	$2,944,359	Certified Technical Experts, Inc.
H349 Inspection and Laboratory Services (except medical/dental): Maintenance and Repair Shop Equipment	$2,126,008	Helena Aircraft Inc.
H346 Inspection and Laboratory Services (except medical/dental): Water Purification and Sewage Treatment Equipment	$1,962,648	Hyperion Biotechnology, Inc.
H365 Inspection and Laboratory Services (except medical/dental): Medical, Dental, and Veterinary Equipment and Supplies	$1,605,578	Universal Consultants Incorporated
H345 Inspection and Laboratory Services (except medical/dental): Plumbing, Heating, and Waste Disposal Equipment	$1,521,937	Magadia Consulting Inc.
H320 Inspection and Laboratory Services (except medical/dental): Ship and Marine Equipment	$1,499,771	American Bureau of Shipping
H335 Inspection and Laboratory Services (except medical/dental): Service and Trade Equipment	$1,061,421	Pacific Coast Contracting Group
H399 Inspection and Laboratory Services (except medical/dental): Miscellaneous	-$17,540,846	Jacobs Engineering Group 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 $139 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 H3 contractors in FY2021?

1. Versar Inc. ($10.1M), 2. Oneida Engineering Solutions LLC ($9.9M), 3. AECOM ($9.04M), 4. Building Inspection Service, Inc. ($3.96M), 5. Johnson, Mirmiran & Thompson, Inc. ($3.48M), 6. Martinfederal Consulting, LLC ($3.47M), 7. MYI Limited ($3.23M), 8. Mountain Horse LLC ($3.08M), 9. Project Solutions, Inc. ($2.52M), 10. AFG Group Inc. ($2.46M).

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