Top 100 Contractors in PSC C: Architect/Engineer Services, FY2021

Name: Top 100 Contractors in PSC C: Architect/Engineer Services, FY2021
Creator: GovTribe

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

The top 10 won 21% of FY2021 PSC C contract dollars

Contract obligations: $5,490,546,302 Net of deobligations, by contracts coded PSC C or a code under it
Contractors: 2,193 Parent companies with an obligation
Largest contractor: Caddell Construction Co., Inc. $214 million, 3.4% 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	Caddell Construction Co., Inc. Through Caddell Construction Co. (De), LLC Top agencies DOS (Department of State)	$214,069,260	3.4%	Rank history: not on the FY2022–FY2025 lists; up 83 since FY2020.
2	Hdr, Inc. 43 awardees, including HDR Environmental, Operations and Construction, Inc., HDR Engineering, Inc of the Carolinas and HDR Architecture, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$209,713,530	3.4%	Rank history: #3 in FY2022, #4 in FY2023, #5 in FY2024 and #3 in FY2025; up 3 since FY2020.
3	AECOM 37 awardees, including AECOM Technical Services, Inc., Aecom-Baker-Cardno Navfac Atlantic Planning JV and AECOM International Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$190,105,418	3.1%	Rank history: #2 in FY2022, #2 in FY2023, #14 in FY2024 and #13 in FY2025; down 2 since FY2020.
4	Jacobs Engineering Group Inc. 36 awardees, including Ch2M Hill, Inc., Ch2M Hill Constructors, Inc. and Jacobs Government Services Co Top agencies Navy (Department of the Navy) Army (Department of the Army) DOT (Department of Transportation)	$132,372,903	2.1%	Rank history: #4 in FY2022, #3 in FY2023, #49 in FY2024 and not on the FY2025 list; down 2 since FY2020.
5	Tetra Tech, Inc. 25 awardees Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$121,784,468	2.0%	Rank history: #6 in FY2022, #6 in FY2023, #12 in FY2024 and #10 in FY2025; down 2 since FY2020.
6	Burns & Mcdonnell, Inc. 3 awardees, including Burns & Mcdonnell Engineering Company, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$121,305,271	1.9%	Rank history: #8 in FY2022, #5 in FY2023, #21 in FY2024 and not on the FY2025 list; up 4 since FY2020.
7	The Compass PTS JV Top agencies DHS (Department of Homeland Security)	$91,982,343	1.5%	Rank history: #26 in FY2022, #10 in FY2023, #35 in FY2024 and #57 in FY2025; up 4 since FY2020.
8	CCI Utility and Construction Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$85,052,292	1.4%	Rank history: #7 in FY2022, #7 in FY2023, #8 in FY2024 and #8 in FY2025; down 2 since FY2020.
9	Mndpi Pacific JV Top agencies Navy (Department of the Navy)	$80,008,105	1.3%	Rank history: #10 in FY2022, #24 in FY2023, #56 in FY2024 and not on the FY2025 list; up 59 since FY2020.
10	Starr II, A Joint Venture Top agencies DHS (Department of Homeland Security)	$74,768,966	1.2%	Rank history: #22 in FY2022, #19 in FY2023, #29 in FY2024 and #56 in FY2025; up 2 since FY2020.
11	B.l. Harbert Holdings, L.L.C. Through BL Harbert International LLC Top agencies DOS (Department of State)	$68,919,561	1.1%	Rank history: #1 in FY2022, #1 in FY2023, #11 in FY2024 and not on the FY2025 list; up 14 since FY2020.
12	Black & Veatch Special Projects Corp. Top agencies Army (Department of the Army) Navy (Department of the Navy) MDA (DOD Missile Defense Agency)	$58,398,190	0.9%	Rank history: #41 in FY2022, #13 in FY2023, #23 in FY2024 and #12 in FY2025; up 14 since FY2020.
13	City & County of Denver Top agencies DHS (Department of Homeland Security)	$55,860,360	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
14	Garco Construction, Inc. Top agencies Navy (Department of the Navy)	$54,155,116	0.9%	Rank history: not on the FY2022–FY2025 lists; up 78 since FY2020.
15	Parsons Corporation 4 awardees, including Parsons Government Services Inc. and Parsons-Versar Joint Venture Top agencies DOL (Department of Labor) Army (Department of the Army) USAF (Department of the Air Force)	$51,261,719	0.8%	Rank history: #20 in FY2022, #8 in FY2023, #10 in FY2024 and #4 in FY2025; down 7 since FY2020.
16	Northrop Grumman Corporation 3 awardees, including Orbital Sciences LLC and Northrop Grumman Systems Corporation Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) Navy (Department of the Navy)	$50,236,275	0.8%	Rank history: #47 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
17	Camp Dresser & Mckee Inc. 8 awardees, including CDM International Inc. and CDM Federal Programs Corporation Top agencies USAID (US Agency for International Development) Army (Department of the Army) EPA (Environmental Protection Agency)	$49,657,304	0.8%	Rank history: #21 in FY2022, #30 in FY2023, #86 in FY2024 and not on the FY2025 list; down 4 since FY2020.
18	Jacobs / Hdr, A Joint Venture (Navfac Atlantic Srm) Top agencies Navy (Department of the Navy)	$46,683,407	0.8%	Rank history: not on the FY2022 list, #55 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
19	Sea Pac Engineering Inc. Top agencies DOS (Department of State)	$44,043,372	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
20	Jacobs / Ewingcole, A Joint Venture Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$40,560,009	0.7%	Rank history: #25 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
21	WHR Architects, Inc. Through Page Southerland Page, Inc. Top agencies DOS (Department of State) DHS (Department of Homeland Security) DOI (Department of the Interior)	$40,558,481	0.7%	Rank history: not on the FY2022–FY2025 lists; up 186 since FY2020.
22	RBA Group the 4 awardees, including NV5 Geospatial, Inc., NV5 Consultants, Inc. and Geodynamics LLC Top agencies DOI (Department of the Interior) Army (Department of the Army) DOS (Department of State)	$39,714,243	0.6%	Rank history: #16 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
23	Jacobs Government Services Company 2 awardees Top agencies DOI (Department of the Interior) Army (Department of the Army) DOS (Department of State)	$39,207,477	0.6%	Rank history: #15 in FY2022, #9 in FY2023, #4 in FY2024 and #1 in FY2025; down 6 since FY2020.
24	EA Engineering, Science, and Technology, Inc., PBC 2 awardees Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy) USAF (Department of the Air Force)	$38,542,441	0.6%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
25	Arcadis N.V. 7 awardees, including Arcadis U.s., Inc., Arcadis Germany GMBH and Arcadis-Exp Federal JV Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) DHS (Department of Homeland Security)	$34,512,345	0.6%	Rank history: #18 in FY2022, #28 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
26	JX Holdings Inc. Through Nippo Corporation Top agencies Navy (Department of the Navy)	$33,988,008	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
27	Michael Baker International, LLC 7 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$33,860,821	0.5%	Rank history: #31 in FY2022, #25 in FY2023, #18 in FY2024 and #33 in FY2025; up 17 since FY2020.
28	AECOM HDR Galveston JV Top agencies Army (Department of the Army)	$33,179,570	0.5%	Rank history: not on the FY2022–FY2025 lists; up 39 since FY2020.
29	Michael Baker International & Huitt-Zollars JV Top agencies Army (Department of the Army)	$32,256,251	0.5%	Rank history: not on the FY2022 list, #54 in FY2023 and not on the FY2024–FY2025 lists; up 126 since FY2020.
30	SC Companies, Inc. 4 awardees, including Stanley Consultants, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USDA (Department of Agriculture)	$31,645,057	0.5%	Rank history: #9 in FY2022, #38 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
31	Stantec Incorporated 19 awardees, including Stantec Consulting Services Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOI (Department of the Interior)	$31,546,611	0.5%	Rank history: #17 in FY2022 and not on the FY2023–FY2025 lists; down 16 since FY2020.
32	Woolpert, Inc. 5 awardees, including Waller, Todd & Sadler, A Woolpert Company, LLC and Geomatics Data Solutions, A Woolpert Company, LLC Top agencies DOI (Department of the Interior) Army (Department of the Army) USAF (Department of the Air Force)	$30,130,468	0.5%	Rank history: #19 in FY2022, #49 in FY2023, #37 in FY2024 and #21 in FY2025; down 11 since FY2020.
33	Clark Nexsen Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DHS (Department of Homeland Security)	$29,079,513	0.5%	Rank history: #52 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; up 138 since FY2020.
34	Walsh Federal Joint Venture Top agencies Army (Department of the Army)	$28,007,700	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. and Leidos Engineering LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Commerce (Department of Commerce)	$27,602,448	0.4%	Rank history: #37 in FY2022, #22 in FY2023, #28 in FY2024 and #27 in FY2025; up 28 since FY2020.
36	Trevet-Bay West Joint Venture, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$27,131,611	0.4%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; up 39 since FY2020.
37	Louis Berger U.S. Inc. 13 awardees, including WSP USA Inc., WSP USA Solutions Inc. and WSP USA Buildings Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOT (Department of Transportation)	$25,728,744	0.4%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; down 19 since FY2020.
38	Krueck & Sexton Architects, Ltd Top agencies GSA (General Services Administration) DOS (Department of State) SSA (Social Security Administration)	$25,267,565	0.4%	Rank history: not on the FY2022–FY2025 lists; up 111 since FY2020.
39	Walga Ross Group JV Top agencies DOI (Department of the Interior)	$24,070,218	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	Smithgroup Companies, Inc. 3 awardees, including Smithgroup, Inc. Top agencies SSA (Social Security Administration) GSA (General Services Administration) DOI (Department of the Interior)	$22,988,796	0.4%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
41	Ea-Baker JV Top agencies DLA (Defense Logistics Agency)	$22,794,560	0.4%	Rank history: #44 in FY2022, #47 in FY2023, #61 in FY2024 and not on the FY2025 list; unchanged since FY2020.
42	Noresco LLC Top agencies VA (Department of Veterans Affairs)	$22,132,237	0.4%	Rank history: not on the FY2022–FY2025 lists; up 65 since FY2020.
43	The Dewberry Companies LC 5 awardees, including Dewberry Engineers Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) DOJ (Department of Justice)	$21,961,621	0.4%	Rank history: #28 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
44	Paul Minneapolis-St Metropolitan Airports Commission Through Metropolitan Airports Commission Top agencies DHS (Department of Homeland Security)	$20,766,022	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
45	Asmd LLC Top agencies Navy (Department of the Navy)	$20,113,956	0.3%	Rank history: #61 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; up 21 since FY2020.
46	Anderson Engineering of Minnesota, LLC Top agencies VA (Department of Veterans Affairs)	$19,900,092	0.3%	Rank history: not on the FY2022–FY2023 lists, #63 in FY2024 and #50 in FY2025; up 28 since FY2020.
47	Dj&A, P.C. Top agencies DOT (Department of Transportation) USDA (Department of Agriculture) DOI (Department of the Interior)	$19,576,864	0.3%	Rank history: #45 in FY2022, #74 in FY2023, #71 in FY2024 and not on the FY2025 list; up 95 since FY2020.
48	Spur Design, LLC Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation)	$19,205,357	0.3%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 193 since FY2020.
49	Ahtna Infrastructure & Technologies LLC Top agencies Commerce (Department of Commerce) DOT (Department of Transportation)	$19,084,895	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Dallas / Fort Worth International Airport Top agencies DHS (Department of Homeland Security)	$18,627,338	0.3%	Rank history: not on the FY2022–FY2025 lists; up 363 since FY2020.
51	RLF and Sherlock Smith and Adams JV Top agencies Navy (Department of the Navy)	$18,582,219	0.3%	Rank history: #55 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
52	Lend Lease Corporation Ltd 2 awardees, including Lendlease (Us) Construction Inc. Top agencies Smithsonian (Smithsonian Institution)	$18,191,128	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Ch2M Hill, Inc. Top agencies Navy (Department of the Navy) EPA (Environmental Protection Agency) NASA (National Aeronautics and Space Administration)	$17,802,187	0.3%	Rank history: not on the FY2022–FY2023 lists, #6 in FY2024 and #11 in FY2025; up 80 since FY2020.
54	Kleinfelder - Stantec Usace A Joint Venture Top agencies Army (Department of the Army)	$17,295,384	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Page-Loring LLC Top agencies Smithsonian (Smithsonian Institution) GSA (General Services Administration)	$17,278,088	0.3%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
56	Richard & Kennedy Architects, LLC Top agencies DOS (Department of State)	$17,092,020	0.3%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; up 434 since FY2020.
57	Nicklaus Engineering, Inc. 2 awardees, including Multi-Mac JV and Nicklaus Amec JV Top agencies Navy (Department of the Navy)	$16,783,128	0.3%	Rank history: #57 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; down 20 since FY2020.
58	Whitman Requardt & Associates LLP Top agencies Army (Department of the Army) Navy (Department of the Navy) DOS (Department of State)	$16,446,295	0.3%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; up 123 since FY2020.
59	Jacobs / B&M A Joint Venture Top agencies Navy (Department of the Navy)	$15,964,409	0.3%	Rank history: not on the FY2022 list, #42 in FY2023, #64 in FY2024 and #26 in FY2025; up 229 since FY2020.
60	Wood Environment & Infrastructure Solutions Inc. 3 awardees, including WSP USA Environment & Infrastructure Inc., WSP E&Is GMBH and Wood Programs Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$15,785,220	0.3%	Rank history: #60 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; down 44 since FY2020.
61	Science Applications International Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army)	$15,574,688	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Baker Jacobs JV Top agencies Army (Department of the Army)	$15,353,312	0.2%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
63	RMF Engineering, Inc., P.C. Top agencies HHS (Department of Health and Human Services) DOS (Department of State) Army (Department of the Army)	$14,889,218	0.2%	Rank history: not on the FY2022–FY2025 lists; up 51 since FY2020.
64	MPR Associates, Inc. Top agencies Army (Department of the Army)	$14,836,668	0.2%	Rank history: #72 in FY2022, #63 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
65	Missouri State of Through Missouri. City of Kansas City Top agencies DHS (Department of Homeland Security)	$14,616,008	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	RQ Construction, LLC Top agencies Navy (Department of the Navy)	$14,589,816	0.2%	Rank history: #36 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; down 57 since FY2020.
67	Apogee Consulting Group, P.a. Top agencies VA (Department of Veterans Affairs)	$14,565,557	0.2%	Rank history: #50 in FY2022, #33 in FY2023, not on the FY2024 list and #51 in FY2025; up 58 since FY2020.
68	The Miller / Hull Partnership, LLP Top agencies DOS (Department of State)	$14,044,997	0.2%	Rank history: not on the FY2022–FY2025 lists; up 300 since FY2020.
69	Element Environmental, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$13,897,598	0.2%	Rank history: not on the FY2022–FY2024 lists and #91 in FY2025; up 74 since FY2020.
70	URS Corporation Through Urs-Smithgroup Joint Venture Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$13,743,398	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Commonwealth Ports Authority Top agencies DHS (Department of Homeland Security)	$13,552,746	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Goldenwolf - Ewingcole A Joint Venture LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$13,523,660	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	KAL Architects, Inc. Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs) Army (Department of the Army)	$13,416,254	0.2%	Rank history: not on the FY2022–FY2023 lists, #89 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
74	Fugro Geospatial Inc. 5 awardees, including Fugro USA Land, Inc., Fugro USA Marine, Inc. and Fugro Consult GMBH Top agencies DOI (Department of the Interior) Commerce (Department of Commerce) Army (Department of the Army)	$13,382,152	0.2%	Rank history: #64 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
75	SBD Alliant, LLC Top agencies DHA (Defense Health Agency)	$13,282,708	0.2%	Rank history: #75 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
76	Toland Mizell Molnar LLC Top agencies VA (Department of Veterans Affairs)	$13,273,697	0.2%	Rank history: #81 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 28 since FY2020.
77	Vali Cooper International LLC Top agencies VA (Department of Veterans Affairs) DOE (Department of Energy) Army (Department of the Army)	$13,064,239	0.2%	Rank history: #94 in FY2022, not on the FY2023–FY2024 lists and #84 in FY2025; up 121 since FY2020.
78	Tehama-Llc and HDR Joint Venture LP Top agencies USAF (Department of the Air Force)	$12,795,195	0.2%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
79	FNI Cowi & CDM Smith JV Top agencies Army (Department of the Army)	$12,782,868	0.2%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
80	Transystems Corporation 3 awardees Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$12,570,268	0.2%	Rank history: not on the FY2022–FY2025 lists; up 92 since FY2020.
81	Aptim Federal Services LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$12,436,052	0.2%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
82	Atkins Nuclear Secured Holdings Corporation 4 awardees, including Atkins North America, Inc. and Atkinsrealis USA Inc. Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) Army (Department of the Army)	$12,283,624	0.2%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; up 26 since FY2020.
83	Cardno Emerging Markets USA Ltd. 3 awardees, including Stantec GS Inc. and Cardno Tec-Leidos, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$12,227,241	0.2%	Rank history: #62 in FY2022, #90 in FY2023 and not on the FY2024–FY2025 lists; down 43 since FY2020.
84	Life Science Logistics LLC Top agencies HHS (Department of Health and Human Services)	$12,016,886	0.2%	Rank history: not on the FY2022–FY2025 lists; down 36 since FY2020.
85	Marlon Blackwell Architects, P.a. Top agencies DOS (Department of State)	$11,807,141	0.2%	Rank history: not on the FY2022–FY2025 lists; up 232 since FY2020.
86	Triple C-The A & E Group LLC Top agencies VA (Department of Veterans Affairs)	$11,552,067	0.2%	Rank history: #58 in FY2022, #78 in FY2023 and not on the FY2024–FY2025 lists; up 76 since FY2020.
87	GEO Bancroft Engineering LLC Top agencies VA (Department of Veterans Affairs)	$11,410,476	0.2%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; up 146 since FY2020.
88	KZF Design Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$10,933,608	0.2%	Rank history: not on the FY2022–FY2025 lists; down 45 since FY2020.
89	Multi-Media Environmental Compliance Group Top agencies Navy (Department of the Navy)	$10,784,264	0.2%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
90	Merrick-Rs & H Joint Venture LLP Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) Army (Department of the Army)	$10,706,937	0.2%	Rank history: not on the FY2022 list, #32 in FY2023, not on the FY2024 list and #65 in FY2025; new, not ranked in FY2020.
91	Atriax, P.L.L.C. Top agencies VA (Department of Veterans Affairs)	$10,644,771	0.2%	Rank history: not on the FY2022–FY2025 lists; up 78 since FY2020.
92	Acela Architects + Engineers PC Top agencies VA (Department of Veterans Affairs)	$10,513,635	0.2%	Rank history: not on the FY2022–FY2025 lists; up 322 since FY2020.
93	The Aleut Corporation 2 awardees, including Aleut Construction LLC Top agencies DOI (Department of the Interior)	$10,467,434	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Valhalla Engineering Group, LLC Top agencies VA (Department of Veterans Affairs)	$10,418,611	0.2%	Rank history: not on the FY2022–FY2025 lists; up 60 since FY2020.
95	Acuity - Pt&C, LLC Top agencies Army (Department of the Army) DOE (Department of Energy)	$10,364,353	0.2%	Rank history: #69 in FY2022, not on the FY2023–FY2024 lists and #80 in FY2025; down 35 since FY2020.
96	Weston Solutions Holdings, Inc. 3 awardees, including Weston Solutions Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DOT (Department of Transportation)	$10,272,520	0.2%	Rank history: not on the FY2022–FY2025 lists; up 65 since FY2020.
97	Wiley Wilson Burns & Mcdonnell Joint Venture Top agencies Navy (Department of the Navy) USUHS (DOD Uniformed Services University of the Health Sciences) Army (Department of the Army)	$10,258,924	0.2%	Rank history: not on the FY2022 list, #84 in FY2023, #55 in FY2024 and not on the FY2025 list; up 26 since FY2020.
98	Kenneth Hahn Architects Inc. Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) Army (Department of the Army)	$10,099,568	0.2%	Rank history: not on the FY2022–FY2025 lists; up 11 since FY2020.
99	Summer Consultants, Inc. Top agencies Navy (Department of the Navy) GSA (General Services Administration) HHS (Department of Health and Human Services)	$9,992,566	0.2%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; up 59 since FY2020.
100	CDM Federal Services Europe Joint Venture Top agencies Army (Department of the Army)	$9,944,220	0.2%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.

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100 of 2,193 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC C

Code	Net obligations	Largest contractor
C2 Architect-Engineering Services – General	$3,570,037,091	Caddell Construction Co., Inc.
C1 Architect-Engineering Services – Construction	$1,920,509,211	CCI Utility and Construction Services, 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 $6.22 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 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 C contractors in FY2021?

1. Caddell Construction Co., Inc. ($214M), 2. Hdr, Inc. ($210M), 3. AECOM ($190M), 4. Jacobs Engineering Group Inc. ($132M), 5. Tetra Tech, Inc. ($122M), 6. Burns & Mcdonnell, Inc. ($121M), 7. The Compass PTS JV ($92M), 8. CCI Utility and Construction Services, LLC ($85.1M), 9. Mndpi Pacific JV ($80M), 10. Starr II, A Joint Venture ($74.8M).

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