Top 100 Contractors in NAICS 54135: Building Inspection Services, FY2023

Name: Top 100 Contractors in NAICS 54135: Building Inspection Services, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 70% of FY2023 NAICS 54135 contract dollars

Contract obligations: $175,408,046 Net of deobligations, by contracts coded NAICS 54135 or a code under it
Contractors: 233 Parent companies with an obligation
Largest contractor: Vanguard Inspection Services $79.2 million, 33.9% 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	Vanguard Inspection Services Top agencies DHS (Department of Homeland Security)	$79,214,960	33.9%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2024 and #1 in FY2025; unchanged since FY2022.
2	WSP USA Services Inc. Top agencies DHS (Department of Homeland Security)	$36,322,597	15.6%	Rank history: not on the FY2021 list, #3 in FY2022 and not on the FY2024–FY2025 lists; up 1 since FY2022.
3	Jll-Rer Solutions, LLC Top agencies Army (Department of the Army)	$31,309,315	13.4%	Rank history: not on the FY2021–FY2022 lists, #3 in FY2024 and #4 in FY2025; new.
4	Tribal One Technology, LLC Top agencies USDA (Department of Agriculture) USAF (Department of the Air Force)	$5,299,112	2.3%	Rank history: not on the FY2021 list, #8 in FY2022, #4 in FY2024 and #5 in FY2025; up 4 since FY2022.
5	Institute for Building Technology and Safety Top agencies HUD (Department of Housing and Urban Development)	$4,566,736	2.0%	Rank history: #3 in FY2021, #5 in FY2022, not on the FY2024 list and #3 in FY2025; unchanged since FY2022.
6	Parsons Brinckerhoff Holdings Inc. Through WSP USA Services Inc. Top agencies DHS (Department of Homeland Security)	$2,518,524	1.1%	Rank history: #2 in FY2021, #2 in FY2022, #6 in FY2024 and not on the FY2025 list; down 4 since FY2022.
7	RER Solutions, Inc. Top agencies Army (Department of the Army)	$951,157	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
8	PMA Associates, Inc. Top agencies HUD (Department of Housing and Urban Development)	$883,722	0.4%	Rank history: #6 in FY2021, #9 in FY2022, not on the FY2024 list and #15 in FY2025; up 1 since FY2022.
9	Blackhawk Construction LLC Top agencies VA (Department of Veterans Affairs)	$685,125	0.3%	Rank history: not on the FY2021–FY2022 lists, #16 in FY2024 and #18 in FY2025; new.
10	Thomas A Carcaterra Pe LLC Top agencies Smithsonian (Smithsonian Institution)	$673,670	0.3%	Rank history: #32 in FY2021, #20 in FY2022, #23 in FY2024 and not on the FY2025 list; up 10 since FY2022.
11	Iveco SUD-West Nutzfahrzeuge GMBH Through Ati, Inc. Top agencies DOE (Department of Energy) DOS (Department of State)	$660,124	0.3%	Rank history: #12 in FY2021, #27 in FY2022, #31 in FY2024 and not on the FY2025 list; up 16 since FY2022.
12	Parsons Corporation Through Parsons Government Services Inc. Top agencies Navy (Department of the Navy)	$659,695	0.3%	Rank history: #10 in FY2021, #72 in FY2022, #7 in FY2024 and #17 in FY2025; up 60 since FY2022.
13	MHM Services, Inc. Top agencies DOI (Department of the Interior)	$627,133	0.3%	Rank history: not on the FY2021–FY2022 lists, #24 in FY2024 and not on the FY2025 list; new.
14	Arcadis N.V. Through Arcadis Consulting (Uk) Limited Top agencies USAF (Department of the Air Force)	$548,214	0.2%	Rank history: not on the FY2021 list, #15 in FY2022, #13 in FY2024 and #38 in FY2025; up 1 since FY2022.
15	Carcongroup Engineering PSC Top agencies DHS (Department of Homeland Security)	$492,788	0.2%	Rank history: #14 in FY2021, #18 in FY2022, #11 in FY2024 and #21 in FY2025; up 3 since FY2022.
16	Rd3, Inc. Top agencies GSA (General Services Administration) VA (Department of Veterans Affairs)	$479,922	0.2%	Rank history: #57 in FY2021, #32 in FY2022, #25 in FY2024 and #30 in FY2025; up 16 since FY2022.
17	Voneco Top agencies USAF (Department of the Air Force)	$452,977	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
18	Arias-Guardia & Asoc. Top agencies Smithsonian (Smithsonian Institution)	$420,507	0.2%	Rank history: #71 in FY2021, #23 in FY2022, #17 in FY2024 and #19 in FY2025; up 5 since FY2022.
19	Neucomm Solutions, LLC Top agencies DOE (Department of Energy)	$375,208	0.2%	Rank history: #31 in FY2021, #25 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
20	Reliant Elevator Inspections & Consulting, Inc. Top agencies DOT (Department of Transportation)	$371,806	0.2%	Rank history: #64 in FY2021, not on the FY2022 list, #85 in FY2024 and #54 in FY2025; up 87 since FY2022.
21	Southco Services LLC Top agencies VA (Department of Veterans Affairs)	$371,265	0.2%	Rank history: #61 in FY2021, #24 in FY2022, #20 in FY2024 and #23 in FY2025; up 3 since FY2022.
22	New Horizon Design and Construction Management Company Limited Top agencies Army (Department of the Army)	$361,464	0.2%	Rank history: #22 in FY2021, #41 in FY2022, #34 in FY2024 and #16 in FY2025; up 19 since FY2022.
23	Project Solutions, Inc. Top agencies USDA (Department of Agriculture)	$352,222	0.2%	Rank history: #9 in FY2021, #21 in FY2022, #10 in FY2024 and not on the FY2025 list; down 2 since FY2022.
24	Aurora Industrial Hygiene Top agencies VA (Department of Veterans Affairs)	$323,396	0.1%	Rank history: not on the FY2021–FY2022 lists, #22 in FY2024 and #69 in FY2025; new.
25	Hyundai Engineering & Construction Co.,Ltd. Top agencies OSD (Office of the Secretary of Defense)	$312,561	0.1%	Rank history: not on the FY2021 list, #4 in FY2022 and not on the FY2024–FY2025 lists; down 21 since FY2022.
26	Territory Horticulture Top agencies DOS (Department of State)	$241,429	0.1%	Rank history: #23 in FY2021, #30 in FY2022, #26 in FY2024 and #43 in FY2025; up 4 since FY2022.
27	Quality Consulting Engineers LLC Top agencies VA (Department of Veterans Affairs)	$239,200	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
28	Wrga Fire Training Solutions Inc. Top agencies USAF (Department of the Air Force)	$239,060	0.1%	Rank history: #34 in FY2021, #43 in FY2022, #39 in FY2024 and #71 in FY2025; up 15 since FY2022.
29	Southern Aire Contracting, Inc. Top agencies Army (Department of the Army)	$226,381	0.1%	Rank history: #27 in FY2021, #28 in FY2022, #27 in FY2024 and #32 in FY2025; down 1 since FY2022.
30	Electrical PM Inc. Top agencies VA (Department of Veterans Affairs)	$224,400	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
31	Access North Ltd Top agencies DOS (Department of State)	$222,846	0.1%	Rank history: not on the FY2021–FY2022 lists, #48 in FY2024 and #63 in FY2025; new.
32	Eaton Corporation Top agencies DOS (Department of State)	$222,714	0.1%	Rank history: #29 in FY2021, #33 in FY2022, #28 in FY2024 and not on the FY2025 list; up 1 since FY2022.
33	Atlantic First Industries Corporation Top agencies VA (Department of Veterans Affairs)	$217,582	0.1%	Rank history: #41 in FY2021, #42 in FY2022, #18 in FY2024 and #35 in FY2025; up 9 since FY2022.
34	SDV Services, Inc. Top agencies VA (Department of Veterans Affairs)	$200,606	0.1%	Rank history: not on the FY2021 list, #39 in FY2022, #41 in FY2024 and #45 in FY2025; up 5 since FY2022.
35	Pye-Barker Fire & Safety, LLC Through Fire Protection Service Corp Top agencies VA (Department of Veterans Affairs)	$195,250	0.1%	Rank history: not on the FY2021 list, #37 in FY2022, #30 in FY2024 and not on the FY2025 list; up 2 since FY2022.
36	Jenson Fire Protection Inc Top agencies Army (Department of the Army)	$194,240	0.1%	Rank history: not on the FY2021–FY2022 lists, #32 in FY2024 and not on the FY2025 list; new.
37	DAV Energy Solutions, Inc. Top agencies VA (Department of Veterans Affairs)	$178,449	0.1%	Rank history: #11 in FY2021, #13 in FY2022, not on the FY2024 list and #40 in FY2025; down 24 since FY2022.
38	Kumm Michael Top agencies USAF (Department of the Air Force)	$146,667	0.1%	Rank history: #37 in FY2021, #49 in FY2022 and not on the FY2024–FY2025 lists; up 11 since FY2022.
39	DB Netz AG Regionalnetz Oberpfalz Top agencies Army (Department of the Army)	$132,598	0.1%	Rank history: #44 in FY2021, #56 in FY2022 and not on the FY2024–FY2025 lists; up 17 since FY2022.
40	Hughes Environmental Inc. Top agencies VA (Department of Veterans Affairs)	$129,440	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #33 in FY2025; new.
41	Stephen Phillip Greene Top agencies GSA (General Services Administration)	$123,067	0.1%	Rank history: #33 in FY2021, #34 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
42	Specialized Engineering Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$121,700	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
43	Law Asset Management LLC Top agencies VA (Department of Veterans Affairs)	$121,500	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
44	Mccright & Associates, LLC Top agencies USDA (Department of Agriculture)	$120,744	0.1%	Rank history: not on the FY2021 list, #61 in FY2022, #29 in FY2024 and #48 in FY2025; up 17 since FY2022.
45	Constan Company Limited Top agencies DOS (Department of State)	$119,899	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #94 in FY2025; up 89 since FY2022.
46	Sanirail Construction GMBH Top agencies Army (Department of the Army)	$117,906	0.1%	Rank history: not on the FY2021 list, #55 in FY2022 and not on the FY2024–FY2025 lists; up 9 since FY2022.
47	A- Plus Urban Technics Limited Top agencies DOS (Department of State)	$116,651	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
48	Caldaia Controls LLC Top agencies VA (Department of Veterans Affairs)	$116,223	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
49	Darcom Top agencies DOS (Department of State)	$108,977	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
50	Mindbank Consulting Group, L.L.C. Top agencies DOI (Department of the Interior)	$107,735	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
51	JHC Fire Containment Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$104,191	<0.1%	Rank history: #42 in FY2021, #31 in FY2022, #57 in FY2024 and #53 in FY2025; down 20 since FY2022.
52	Inspection Experts Inc. Top agencies DOS (Department of State)	$99,712	<0.1%	Rank history: #83 in FY2021, #81 in FY2022, not on the FY2024 list and #56 in FY2025; up 29 since FY2022.
53	Brice Solutions, LLC Top agencies USAF (Department of the Air Force)	$96,509	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
54	Hdr, Inc. Through HDR Engineering Inc. Top agencies Army (Department of the Army)	$96,003	<0.1%	Rank history: #17 in FY2021, not on the FY2022 list, #96 in FY2024 and not on the FY2025 list; returned.
55	Agile Construction, Inc. Top agencies VA (Department of Veterans Affairs)	$94,741	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
56	Property & Environmental Management Inc. Top agencies DOJ (Department of Justice)	$94,552	<0.1%	Rank history: #19 in FY2021, #60 in FY2022, #53 in FY2024 and #90 in FY2025; up 4 since FY2022.
57	Veterans Fire and Life Safety Corporation Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$93,712	<0.1%	Rank history: not on the FY2021–FY2022 lists, #33 in FY2024 and #46 in FY2025; up 97 since FY2022.
58	Nancy ST Laurent Top agencies VA (Department of Veterans Affairs)	$90,450	<0.1%	Rank history: #78 in FY2021, #93 in FY2022, #77 in FY2024 and #96 in FY2025; up 35 since FY2022.
59	Mcdonough Bolyard Peck, Inc. Top agencies Smithsonian (Smithsonian Institution)	$87,151	<0.1%	Rank history: #7 in FY2021, #11 in FY2022, #60 in FY2024 and #58 in FY2025; down 48 since FY2022.
60	Electrical Safety Specialists, LLC Top agencies VA (Department of Veterans Affairs)	$85,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
61	HKA Elevator Consulting, Inc. Top agencies GSA (General Services Administration)	$82,613	<0.1%	Rank history: #99 in FY2021, not on the FY2022 list, #37 in FY2024 and not on the FY2025 list; up 47 since FY2022.
62	Building Envelope Management, LLC Top agencies VA (Department of Veterans Affairs)	$81,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
63	The Cleaver-Brooks Company, Inc. Top agencies DOS (Department of State)	$79,100	<0.1%	Rank history: not on the FY2021 list, #77 in FY2022 and not on the FY2024–FY2025 lists; up 14 since FY2022.
64	Triangle Manifold Services, Inc. Top agencies VA (Department of Veterans Affairs)	$78,576	<0.1%	Rank history: #85 in FY2021, #95 in FY2022, #80 in FY2024 and not on the FY2025 list; up 31 since FY2022.
65	Bureau Veritas REG INT Navires Aeronefs Through National Elevator Inspection Services, Inc. Top agencies GSA (General Services Administration)	$78,402	<0.1%	Rank history: #49 in FY2021, #68 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
66	Slocum, Thomas Top agencies VA (Department of Veterans Affairs)	$78,328	<0.1%	Rank history: #28 in FY2021, #91 in FY2022 and not on the FY2024–FY2025 lists; up 25 since FY2022.
67	Talon Veteran Services Incorporated Top agencies VA (Department of Veterans Affairs)	$77,860	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
68	Vanguard Gcs, LLC Top agencies VA (Department of Veterans Affairs)	$77,162	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
69	Bayline Lift Technologies LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce) DOI (Department of the Interior)	$76,027	<0.1%	Rank history: #56 in FY2021, #22 in FY2022 and not on the FY2024–FY2025 lists; down 47 since FY2022.
70	Tekton CC, LLC Top agencies VA (Department of Veterans Affairs)	$75,006	<0.1%	Rank history: not on the FY2021–FY2022 lists, #43 in FY2024 and #37 in FY2025; up 54 since FY2022.
71	Insparisk, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$74,838	<0.1%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2024 and #62 in FY2025; up 30 since FY2022.
72	Aerospace Facilities Group, Inc. Top agencies USAF (Department of the Air Force)	$74,626	<0.1%	Rank history: not on the FY2021 list, #75 in FY2022, #79 in FY2024 and #84 in FY2025; up 3 since FY2022.
73	GCI Construction & Inspections LLC Top agencies USAF (Department of the Air Force)	$74,336	<0.1%	Rank history: not on the FY2021 list, #83 in FY2022, #67 in FY2024 and not on the FY2025 list; up 10 since FY2022.
74	IO Environmental and Infrastructure Incorporated Top agencies VA (Department of Veterans Affairs)	$71,786	<0.1%	Rank history: #72 in FY2021, #89 in FY2022, #62 in FY2024 and not on the FY2025 list; up 15 since FY2022.
75	Heidelberg Resources, LLC Top agencies VA (Department of Veterans Affairs)	$70,725	<0.1%	Rank history: #24 in FY2021, not on the FY2022 list, #54 in FY2024 and not on the FY2025 list; up 109 since FY2022.
76	Industrial Supply Co Inc. Top agencies USAF (Department of the Air Force)	$68,705	<0.1%	Rank history: #16 in FY2021, #40 in FY2022, #70 in FY2024 and #85 in FY2025; down 36 since FY2022.
77	Heat Group Ltd Top agencies Army (Department of the Army)	$68,250	<0.1%	Rank history: not on the FY2021 list, #82 in FY2022, #72 in FY2024 and #88 in FY2025; up 5 since FY2022.
78	Kirila Fire Training Facilities Inc Top agencies USAF (Department of the Air Force)	$67,906	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
79	Mass Tank Inspection Services LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$66,621	<0.1%	Rank history: #95 in FY2021, not on the FY2022 list, #99 in FY2024 and not on the FY2025 list; up 33 since FY2022.
80	Bradford Roof Management, Inc. Top agencies Army (Department of the Army)	$65,537	<0.1%	Rank history: #73 in FY2021, #90 in FY2022, #69 in FY2024 and #95 in FY2025; up 10 since FY2022.
81	RBA Group the Through NV5 Consultants, Inc. Top agencies Smithsonian (Smithsonian Institution)	$64,357	<0.1%	Rank history: #13 in FY2021, #59 in FY2022, #61 in FY2024 and #13 in FY2025; down 22 since FY2022.
82	Media Plumbing & Heating Inc. Top agencies VA (Department of Veterans Affairs)	$63,000	<0.1%	Rank history: #74 in FY2021, #92 in FY2022 and not on the FY2024–FY2025 lists; up 10 since FY2022.
83	Haskoningdhv Nederland B.V. Through Haskoning Nederland B.V. Top agencies USAF (Department of the Air Force)	$60,212	<0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #93 in FY2025; new.
84	Control Infotech Inc. Top agencies DOS (Department of State)	$60,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
85	Johnson Controls Industries Through Johnson Controls Building Automation Systems, LLC Top agencies DOS (Department of State)	$59,344	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
86	Technical Safety Services, LLC Top agencies VA (Department of Veterans Affairs)	$59,310	<0.1%	Rank history: #75 in FY2021, #88 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
87	Jogra TECH Limited Top agencies DOS (Department of State)	$58,171	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
88	Panacea Construction Group LLC Top agencies VA (Department of Veterans Affairs)	$55,579	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 103 since FY2022.
89	Alaska Air Balancing, Inc. Top agencies DOT (Department of Transportation)	$54,200	<0.1%	Rank history: #81 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 64 since FY2022.
90	RMS GMBH Rasenpflege- UND Mäh-Service Top agencies Army (Department of the Army)	$51,705	<0.1%	Rank history: not on the FY2021 list, #97 in FY2022, #92 in FY2024 and not on the FY2025 list; up 7 since FY2022.
91	Pacific Coast Contracting Group Top agencies VA (Department of Veterans Affairs)	$50,640	<0.1%	Rank history: #82 in FY2021, not on the FY2022 list, #90 in FY2024 and not on the FY2025 list; up 11 since FY2022.
92	Greenefficient Inc. Top agencies VA (Department of Veterans Affairs)	$50,394	<0.1%	Rank history: #76 in FY2021, not on the FY2022 list, #88 in FY2024 and not on the FY2025 list; up 11 since FY2022.
93	RJY Group LLC Top agencies VA (Department of Veterans Affairs)	$50,382	<0.1%	Rank history: #55 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 11 since FY2022.
94	Westnet, LLC Top agencies Army (Department of the Army)	$49,894	<0.1%	Rank history: not on the FY2021 list, #79 in FY2022, #95 in FY2024 and not on the FY2025 list; down 15 since FY2022.
95	RAV EHS Consulting LLC Top agencies Army (Department of the Army)	$49,550	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
96	Final Limit Elevator Inspections LLC Top agencies VA (Department of Veterans Affairs)	$48,018	<0.1%	Rank history: not on the FY2021–FY2022 lists, #49 in FY2024 and #51 in FY2025; new.
97	Vimau, S.A. De C.V. Top agencies DOS (Department of State)	$44,690	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 14 since FY2022.
98	B.s.t.e.c SARL Top agencies DOS (Department of State)	$43,680	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
99	Letcher's Eci, LLC Top agencies VA (Department of Veterans Affairs)	$43,170	<0.1%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2024 and not on the FY2025 list; up 19 since FY2022.
100	PT. Lajogi Makmur Bersama Top agencies DOS (Department of State)	$40,746	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.

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100 of 233 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 54135

Code	Net obligations	Largest contractor
541350 Building Inspection Services	$175,408,046	Vanguard Inspection Services

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 $234 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 54135 contractors in FY2023?

1. Vanguard Inspection Services ($79.2M), 2. WSP USA Services Inc. ($36.3M), 3. Jll-Rer Solutions, LLC ($31.3M), 4. Tribal One Technology, LLC ($5.3M), 5. Institute for Building Technology and Safety ($4.57M), 6. Parsons Brinckerhoff Holdings Inc. ($2.52M), 7. RER Solutions, Inc. ($951K), 8. PMA Associates, Inc. ($884K), 9. Blackhawk Construction LLC ($685K), 10. Thomas A Carcaterra Pe LLC ($674K).

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