Top 100 Contractors in PSC C1: Architect-Engineering Services – Construction, FY2023

Name: Top 100 Contractors in PSC C1: Architect-Engineering Services – Construction, FY2023
Creator: GovTribe

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

The top 10 won 44% of FY2023 PSC C1 contract dollars

Contract obligations: $2,911,948,406 Net of deobligations, by contracts coded PSC C1 or a code under it
Contractors: 975 Parent companies with an obligation
Largest contractor: B.l. Harbert Holdings, L.L.C. $840 million, 27.1% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	B.l. Harbert Holdings, L.L.C. Through BL Harbert International LLC Top agencies DOS (Department of State)	$839,654,506	27.1%	Rank history: #3 in FY2021, #1 in FY2022, #3 in FY2024 and not on the FY2025 list; unchanged since FY2022.
2	CCI Utility and Construction Services, LLC Top agencies Army (Department of the Army)	$120,596,147	3.9%	Rank history: #1 in FY2021, #3 in FY2022, #2 in FY2024 and #2 in FY2025; up 1 since FY2022.
3	Parsons Corporation 3 awardees, including Ptsi Managed Services Inc., Parsons Government Services Inc. and Parsons-Versar Joint Venture Top agencies DOT (Department of Transportation) DOL (Department of Labor) Army (Department of the Army)	$93,928,850	3.0%	Rank history: #12 in FY2021, #11 in FY2022, #4 in FY2024 and #1 in FY2025; up 8 since FY2022.
4	Jacobs Engineering Group Inc. 13 awardees, including JE Architects / Engineers, P.C., Ch2M Hill, Inc. and Jacobs Government Services Company Top agencies Army (Department of the Army) DOT (Department of Transportation) USAF (Department of the Air Force)	$76,565,907	2.5%	Rank history: #6 in FY2021, #6 in FY2022, #52 in FY2024 and not on the FY2025 list; up 2 since FY2022.
5	AECOM 10 awardees, including AECOM Technical Services, Inc., AECOM Smith Carter Joint Venture and AECOM + Tetra TECH Joint Venture Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DOI (Department of the Interior)	$53,809,245	1.7%	Rank history: #8 in FY2021, #10 in FY2022, #30 in FY2024 and #71 in FY2025; up 5 since FY2022.
6	Mndpi Pacific JV Top agencies Navy (Department of the Navy)	$43,229,465	1.4%	Rank history: #2 in FY2021, #5 in FY2022, #19 in FY2024 and #32 in FY2025; down 1 since FY2022.
7	Ciri Development Corporation Through North Wind Construction Services, LLC Top agencies DOE (Department of Energy)	$33,698,007	1.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
8	Burns & Mcdonnell, Inc. 3 awardees, including Burns & Mcdonnell Engineering Company, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DLA (Defense Logistics Agency)	$33,686,426	1.1%	Rank history: #14 in FY2021, #16 in FY2022, #29 in FY2024 and not on the FY2025 list; up 8 since FY2022.
9	Spees-Hernandez JV LLC Through Spees LLC Top agencies VA (Department of Veterans Affairs)	$33,285,876	1.1%	Rank history: #59 in FY2021, #20 in FY2022, #40 in FY2024 and #18 in FY2025; up 11 since FY2022.
10	Weeks Marine Inc. Top agencies Army (Department of the Army)	$33,112,700	1.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
11	Jacobs / B&V, A Joint Venture (Federal Services) Top agencies Navy (Department of the Navy)	$32,642,980	1.1%	Rank history: not on the FY2021–FY2022 lists, #27 in FY2024 and not on the FY2025 list; new.
12	HOK Group, Inc. 3 awardees, including Hellmuth, Obata & Kassabaum, Inc. Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration)	$29,891,924	1.0%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 266 since FY2022.
13	RQ Construction, LLC Top agencies Navy (Department of the Navy)	$29,346,632	0.9%	Rank history: #24 in FY2021, #8 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
14	Apogee Consulting Group, P.a. Top agencies VA (Department of Veterans Affairs)	$28,711,450	0.9%	Rank history: #27 in FY2021, #14 in FY2022, #70 in FY2024 and #12 in FY2025; unchanged since FY2022.
15	Insight Environmental Engineering & Construction, Inc. Top agencies USAF (Department of the Air Force)	$27,144,752	0.9%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #36 in FY2025; new.
16	LEO a Daly and Huitt Zollars, a Joint Venture 3 awardees, including LEO A. Daly LLC Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation) GSA (General Services Administration)	$26,078,612	0.8%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 443 since FY2022.
17	AE Works Ltd 2 awardees Top agencies VA (Department of Veterans Affairs)	$25,929,736	0.8%	Rank history: #100 in FY2021, #62 in FY2022, #28 in FY2024 and #81 in FY2025; up 45 since FY2022.
18	The Whiting-Turner Contracting Company Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$25,790,296	0.8%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
19	Hdr, Inc. 16 awardees, including HDR Engineering, Inc., HDR Environmental, Operations and Construction, Inc. and HDR Architecture, Inc. Top agencies DOT (Department of Transportation) Army (Department of the Army) VA (Department of Veterans Affairs)	$23,191,167	0.7%	Rank history: #26 in FY2021, #7 in FY2022, #39 in FY2024 and #15 in FY2025; down 12 since FY2022.
20	North Wind Construction Services, LLC Top agencies DOE (Department of Energy)	$20,258,040	0.7%	Rank history: not on the FY2021 list, #51 in FY2022 and not on the FY2024–FY2025 lists; up 31 since FY2022.
21	Specialized Engineering Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$19,638,735	0.6%	Rank history: #56 in FY2021, #36 in FY2022, #65 in FY2024 and #44 in FY2025; up 15 since FY2022.
22	Stratton Straub Joint Venture LLC Top agencies VA (Department of Veterans Affairs)	$19,488,000	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
23	Triple C-The A & E Group LLC Top agencies VA (Department of Veterans Affairs)	$17,404,125	0.6%	Rank history: #36 in FY2021, #13 in FY2022, #42 in FY2024 and not on the FY2025 list; down 10 since FY2022.
24	Michael Baker International & Huitt-Zollars JV Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$17,061,640	0.6%	Rank history: #10 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 373 since FY2022.
25	Golder Europe Service Centre SRL Through WSP USA Inc. Top agencies Navy (Department of the Navy)	$16,860,741	0.5%	Rank history: not on the FY2021–FY2022 lists, #22 in FY2024 and #30 in FY2025; new.
26	Snow Kreilich Architects Inc. Top agencies GSA (General Services Administration)	$16,319,778	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 425 since FY2022.
27	Mno-Bmadsen Through Seven Generations Architecture & Engineering LLC Top agencies DOI (Department of the Interior) HHS (Department of Health and Human Services) Army (Department of the Army)	$15,017,988	0.5%	Rank history: #87 in FY2021, #17 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
28	Davis Brody Bond, LLP Top agencies GSA (General Services Administration)	$14,836,182	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
29	Davis Brody Bond-Spacesmith A Joint Venture Top agencies GSA (General Services Administration)	$14,243,115	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 175 since FY2022.
30	Schneider Electric Buildings Americas Inc. Top agencies USDA (Department of Agriculture)	$13,970,025	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 84 since FY2022.
31	Qayaq Government Solutions LLC Top agencies DOE (Department of Energy)	$12,531,953	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
32	Gdm-Ae, Inc. Top agencies VA (Department of Veterans Affairs)	$12,395,997	0.4%	Rank history: #63 in FY2021, #38 in FY2022, #67 in FY2024 and #84 in FY2025; up 6 since FY2022.
33	FFE - Heapy JV, LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$12,019,682	0.4%	Rank history: not on the FY2021 list, #31 in FY2022 and not on the FY2024–FY2025 lists; down 2 since FY2022.
34	The Johnson-Mcadams Firm, P.a. Top agencies USDA (Department of Agriculture) USAF (Department of the Air Force) DOI (Department of the Interior)	$11,900,948	0.4%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2024 and #40 in FY2025; up 88 since FY2022.
35	Awen Solutions Group, LLC Top agencies VA (Department of Veterans Affairs)	$11,253,185	0.4%	Rank history: not on the FY2021 list, #33 in FY2022, #25 in FY2024 and #79 in FY2025; down 2 since FY2022.
36	Black & Veatch Special Projects Corp. 2 awardees Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$11,211,983	0.4%	Rank history: #18 in FY2021, #30 in FY2022, #76 in FY2024 and #8 in FY2025; down 6 since FY2022.
37	Chickasaw Defense Logistics, LLC Top agencies Army (Department of the Army)	$11,174,712	0.4%	Rank history: #64 in FY2021, #22 in FY2022 and not on the FY2024–FY2025 lists; down 15 since FY2022.
38	Above Group Inc. Top agencies VA (Department of Veterans Affairs)	$11,044,687	0.4%	Rank history: not on the FY2021 list, #77 in FY2022, #83 in FY2024 and #29 in FY2025; up 39 since FY2022.
39	Jacobs Government Services Company Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$10,607,839	0.3%	Rank history: #94 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 244 since FY2022.
40	Blue Arrow Architecture LLC Top agencies DOI (Department of the Interior)	$10,339,352	0.3%	Rank history: not on the FY2021 list, #96 in FY2022 and not on the FY2024–FY2025 lists; up 56 since FY2022.
41	Miller-Remick, LLC Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration)	$10,146,179	0.3%	Rank history: #81 in FY2021, #21 in FY2022, #18 in FY2024 and #13 in FY2025; down 20 since FY2022.
42	Camp Dresser & Mckee Inc. 2 awardees, including CDM Federal Programs Corporation Top agencies USAF (Department of the Air Force)	$10,067,037	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 171 since FY2022.
43	Enterprise Engineering, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$9,625,577	0.3%	Rank history: #45 in FY2021, #46 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
44	Summer Consultants Inc Top agencies Navy (Department of the Navy) GSA (General Services Administration) SSA (Social Security Administration)	$9,422,438	0.3%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2024 and not on the FY2025 list; new.
45	Jacobs / B&M A Joint Venture Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$9,394,616	0.3%	Rank history: #25 in FY2021, not on the FY2022 list, #55 in FY2024 and #23 in FY2025; up 89 since FY2022.
46	Merrick Freese & Nichols JV Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$9,356,823	0.3%	Rank history: not on the FY2021 list, #69 in FY2022 and not on the FY2024–FY2025 lists; up 23 since FY2022.
47	Toland Mizell Molnar LLC 2 awardees Top agencies VA (Department of Veterans Affairs)	$9,336,029	0.3%	Rank history: #53 in FY2021, #37 in FY2022, #43 in FY2024 and not on the FY2025 list; down 10 since FY2022.
48	Lend Lease Corporation Ltd Through Lendlease (Us) Construction Inc. Top agencies Smithsonian (Smithsonian Institution)	$9,034,190	0.3%	Rank history: #20 in FY2021, #32 in FY2022, #54 in FY2024 and not on the FY2025 list; down 16 since FY2022.
49	Trane U.S. Inc. Top agencies GSA (General Services Administration)	$8,645,203	0.3%	Rank history: #49 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
50	The Chenega Corporation 3 awardees, including Chenega Worldwide Support, LLC, Native Technology Solutions, LLC and Chenega Integrated Security Solutions, LLC Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) DOJ (Department of Justice)	$8,574,192	0.3%	Rank history: not on the FY2021 list, #23 in FY2022 and not on the FY2024–FY2025 lists; down 27 since FY2022.
51	Obera LLC Top agencies USAF (Department of the Air Force)	$8,394,665	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
52	MRIGLOBAL Top agencies HHS (Department of Health and Human Services)	$8,362,058	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
53	DAV Energy Solutions, Inc. Top agencies VA (Department of Veterans Affairs)	$8,335,479	0.3%	Rank history: not on the FY2021 list, #53 in FY2022, #95 in FY2024 and #47 in FY2025; unchanged since FY2022.
54	The Aleut Corporation Through Aleut Construction LLC Top agencies DOI (Department of the Interior)	$8,330,962	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
55	Atriax, P.L.L.C. Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$8,251,358	0.3%	Rank history: #41 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 48 since FY2022.
56	Spur Design LLC Top agencies VA (Department of Veterans Affairs)	$8,127,367	0.3%	Rank history: not on the FY2021–FY2022 lists, #32 in FY2024 and #27 in FY2025; new.
57	Alesia Architecture PC Top agencies VA (Department of Veterans Affairs)	$8,040,757	0.3%	Rank history: #98 in FY2021, #59 in FY2022, #47 in FY2024 and not on the FY2025 list; up 2 since FY2022.
58	Andrew C Chen 3 awardees Top agencies Navy (Department of the Navy) GSA (General Services Administration)	$7,891,522	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 80 since FY2022.
59	Som-Selldorf Architects - A Joint Venture Top agencies Smithsonian (Smithsonian Institution)	$7,846,630	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
60	Valhalla Engineering Group LLC Top agencies VA (Department of Veterans Affairs)	$7,577,272	0.2%	Rank history: not on the FY2021–FY2022 lists, #33 in FY2024 and #34 in FY2025; up 139 since FY2022.
61	RDC JPA Architecture, L.L.L.P. Top agencies VA (Department of Veterans Affairs)	$7,547,712	0.2%	Rank history: not on the FY2021 list, #26 in FY2022, #31 in FY2024 and #64 in FY2025; down 35 since FY2022.
62	Caddell Construction Co., Inc. Through Caddell Construction Co. (De), LLC Top agencies DOS (Department of State)	$7,017,796	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 162 since FY2022.
63	Ewing Cole Inc. Top agencies Smithsonian (Smithsonian Institution) EPA (Environmental Protection Agency)	$7,006,714	0.2%	Rank history: not on the FY2021 list, #58 in FY2022, #50 in FY2024 and #45 in FY2025; down 5 since FY2022.
64	Elk Consortium LLC Top agencies VA (Department of Veterans Affairs)	$6,865,315	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 115 since FY2022.
65	Aesus Design Group LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$6,842,251	0.2%	Rank history: not on the FY2021 list, #61 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
66	Annum Architects, Inc. Top agencies Smithsonian (Smithsonian Institution)	$6,611,448	0.2%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2024 and not on the FY2025 list; up 360 since FY2022.
67	Anderson Engineering of Minnesota, LLC Top agencies VA (Department of Veterans Affairs)	$6,506,953	0.2%	Rank history: #34 in FY2021, #67 in FY2022, #44 in FY2024 and #57 in FY2025; unchanged since FY2022.
68	Acela Architects + Engineers PC Top agencies VA (Department of Veterans Affairs)	$6,409,832	0.2%	Rank history: #39 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 44 since FY2022.
69	Vali Cooper International LLC Top agencies VA (Department of Veterans Affairs)	$6,396,816	0.2%	Rank history: not on the FY2021–FY2022 lists, #69 in FY2024 and #59 in FY2025; up 124 since FY2022.
70	Ameresco Inc. 2 awardees, including Ameresco Select, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USDA (Department of Agriculture)	$6,346,540	0.2%	Rank history: #50 in FY2021, #54 in FY2022, not on the FY2024 list and #21 in FY2025; down 16 since FY2022.
71	Rogers, Lovelock & Fritz, Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$6,312,501	0.2%	Rank history: #69 in FY2021, #19 in FY2022 and not on the FY2024–FY2025 lists; down 52 since FY2022.
72	CB Design Group, Inc. 3 awardees, including Bravo Zulu LLC Top agencies VA (Department of Veterans Affairs)	$5,979,956	0.2%	Rank history: #89 in FY2021, #25 in FY2022, #79 in FY2024 and #99 in FY2025; down 47 since FY2022.
73	N.k. Bhandari, Architecture & Engineering, P.C. Top agencies GSA (General Services Administration) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$5,939,692	0.2%	Rank history: #74 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 71 since FY2022.
74	Nippi Kosan Co. Ltd. Through NPK Co.,Ltd. Top agencies Army (Department of the Army)	$5,934,207	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
75	Northeast Infrastructure LLC Top agencies VA (Department of Veterans Affairs)	$5,879,724	0.2%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2024 and #97 in FY2025; new.
76	Thinkform Design Architect LLC Top agencies VA (Department of Veterans Affairs)	$5,773,094	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 31 since FY2022.
77	Stantec Inc. 7 awardees, including Stantec Consulting Services Inc. Top agencies USSOCOM (United States Special Operations Command) Army (Department of the Army) DOI (Department of the Interior)	$5,751,143	0.2%	Rank history: not on the FY2021–FY2022 lists, #73 in FY2024 and #41 in FY2025; new.
78	Dattner Architects DPC Top agencies GSA (General Services Administration) DOJ (Department of Justice) SSA (Social Security Administration)	$5,650,326	0.2%	Rank history: #84 in FY2021, not on the FY2022 list, #23 in FY2024 and #54 in FY2025; up 78 since FY2022.
79	Kisby-Lees Mechanical LLC Top agencies DOT (Department of Transportation)	$5,611,322	0.2%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2024 and not on the FY2025 list; up 408 since FY2022.
80	Drummond Carpenter, PLLC Top agencies VA (Department of Veterans Affairs)	$5,550,047	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
81	Guidon Design Inc. Top agencies VA (Department of Veterans Affairs)	$5,468,053	0.2%	Rank history: #43 in FY2021, #76 in FY2022, not on the FY2024 list and #91 in FY2025; down 5 since FY2022.
82	KVG LLC Top agencies USAF (Department of the Air Force)	$5,462,437	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	Health Facility Solutions Company Top agencies VA (Department of Veterans Affairs)	$5,427,386	0.2%	Rank history: not on the FY2021 list, #70 in FY2022 and not on the FY2024–FY2025 lists; down 13 since FY2022.
84	Emcor Group Inc. Through Emcor Government Services, Inc. Top agencies DOT (Department of Transportation)	$5,350,790	0.2%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2024 and #37 in FY2025; up 255 since FY2022.
85	EXP U.S. Services Inc. 2 awardees, including EXP Federal Inc. Top agencies DOT (Department of Transportation) Army (Department of the Army) USSOCOM (United States Special Operations Command)	$5,330,527	0.2%	Rank history: not on the FY2021 list, #91 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
86	Line and Space, LLC Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$5,302,242	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 125 since FY2022.
87	The Fields Group, LLC Top agencies DOE (Department of Energy)	$5,294,238	0.2%	Rank history: not on the FY2021 list, #89 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
88	Mead & Hunt Inc. Through Mason & Hanger + Mead & Hunt Joint Venture Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$5,276,511	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 340 since FY2022.
89	Stone Group Architects, Inc. Top agencies VA (Department of Veterans Affairs)	$5,260,214	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 28 since FY2022.
90	Yeh and Associates, Inc. Top agencies DOT (Department of Transportation)	$5,212,065	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 92 since FY2022.
91	Morphosis Architects Top agencies GSA (General Services Administration)	$5,180,056	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
92	GEI Consultants Inc. Top agencies DOI (Department of the Interior)	$5,153,999	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 61 since FY2022.
93	RTX Corporation Through Noresco, LLC Top agencies VA (Department of Veterans Affairs)	$5,089,642	0.2%	Rank history: #62 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
94	Superstructures Engineering + Architecture, PLLC Top agencies GSA (General Services Administration)	$5,068,638	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
95	RGD Consulting Engineers Orlando LLC Top agencies VA (Department of Veterans Affairs)	$5,026,953	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
96	Ayers / Saint / Gross, Incorporated Top agencies Smithsonian (Smithsonian Institution)	$4,984,002	0.2%	Rank history: #71 in FY2021, #44 in FY2022 and not on the FY2024–FY2025 lists; down 52 since FY2022.
97	Charlotte Engineers-Guidon JV LLC Top agencies VA (Department of Veterans Affairs)	$4,976,058	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
98	Manson Construction Co. Top agencies Navy (Department of the Navy)	$4,950,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
99	Transystems Corporation Top agencies DHS (Department of Homeland Security)	$4,909,053	0.2%	Rank history: #76 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 270 since FY2022.
100	Cheroenhaka Nottoway Enterprises, LLC Top agencies DHS (Department of Homeland Security)	$4,817,216	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.

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100 of 975 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC C1

Code	Net obligations	Largest contractor
C1AA Architect and Engineering – Construction: Office Buildings	$1,121,631,601	B.l. Harbert Holdings, L.L.C.
C1DA Architect and Engineering – Construction: Hospitals and Infirmaries	$365,946,057	LEO a Daly and Huitt Zollars, a Joint Venture
C1JZ Architect and Engineering – Construction: Miscellaneous Buildings	$155,526,167	The Whiting-Turner Contracting Company
C1QA Architect and Engineering – Construction: Restoration of Real Property (Public or Private)	$133,597,720	CCI Utility and Construction Services, LLC
C1BZ Architect and Engineering – Construction: Other Airfield Structures	$115,655,466	Parsons Corporation
C1AZ Architect and Engineering – Construction: Other Administrative Facilities/Service Buildings	$70,131,592	Burns & Mcdonnell, Inc.
C1LB Architect and Engineering – Construction: Highways, Roads, Streets, Bridges, and Railways	$66,075,756	Hdr, Inc.
C1DZ Architect and Engineering – Construction: Other Hospital Buildings	$57,307,809	Rogers, Lovelock & Fritz, Inc.
C1JA Architect and Engineering – Construction: Museums and Exhibition Buildings	$55,360,928	Lend Lease Corporation Ltd
C1BG Architect and Engineering – Construction: Electronic and Communications Facilities	$50,905,378	AECOM
C1EB Architect and Engineering – Construction: Maintenance Buildings	$49,244,004	Obera LLC
C1PZ Architect and Engineering – Construction: Other Non-Building Facilities	$40,217,319	Golder Europe Service Centre SRL
C1DB Architect and Engineering – Construction: Laboratories and Clinics	$38,677,318	Schneider Electric Buildings Americas Inc.
C1NZ Architect and Engineering – Construction: Other Utilities	$27,490,154	Qayaq Government Solutions LLC

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 $3.09 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 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 PSC C1 contractors in FY2023?

1. B.l. Harbert Holdings, L.L.C. ($840M), 2. CCI Utility and Construction Services, LLC ($121M), 3. Parsons Corporation ($93.9M), 4. Jacobs Engineering Group Inc. ($76.6M), 5. AECOM ($53.8M), 6. Mndpi Pacific JV ($43.2M), 7. Ciri Development Corporation ($33.7M), 8. Burns & Mcdonnell, Inc. ($33.7M), 9. Spees-Hernandez JV LLC ($33.3M), 10. Weeks Marine Inc. ($33.1M).

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