Top 100 Contractors in PSC C1AA: Architect and Engineering – Construction: Office Buildings, FY2024

Name: Top 100 Contractors in PSC C1AA: Architect and Engineering – Construction: Office Buildings, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 85% of FY2024 PSC C1AA contract dollars

Contract obligations: $809,742,921 Net of deobligations, by contracts coded PSC C1AA
Contractors: 223 Parent companies with an obligation
Largest contractor: Brasfield & Gorrie LLC $512 million, 61.7% 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	Brasfield & Gorrie LLC Top agencies DOJ (Department of Justice)	$512,000,000	61.7%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2025; new.
2	B.l. Harbert Holdings, L.L.C. Through BL Harbert International LLC Top agencies DOJ (Department of Justice) DOS (Department of State)	$118,415,195	14.3%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and not on the FY2025 list; down 1 since FY2023.
3	Dattner Architects DPC Top agencies GSA (General Services Administration) DOJ (Department of Justice) SSA (Social Security Administration)	$19,749,440	2.4%	Rank history: #12 in FY2021, #22 in FY2022, #15 in FY2023 and #8 in FY2025; up 12 since FY2023.
4	Teya Support Services LLC Top agencies Navy (Department of the Navy)	$12,992,601	1.6%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2025; new.
5	Burns & Mcdonnell, Inc. Top agencies USAF (Department of the Air Force)	$10,992,375	1.3%	Rank history: #26 in FY2021, #71 in FY2022, not on the FY2023 list and not on the FY2025 list; up 115 since FY2023.
6	Trane U.s. Inc. Top agencies GSA (General Services Administration)	$8,898,589	1.1%	Rank history: not on the FY2021 list, #5 in FY2022, not on the FY2023 list and #6 in FY2025; returned.
7	BL Harbert International LLC Top agencies DOS (Department of State)	$8,106,226	1.0%	Rank history: not on the FY2021–FY2023 lists and #2 in FY2025; new.
8	Jacobs Government Services Company 3 awardees, including Jacobs Engineering Group Inc. Top agencies DOJ (Department of Justice) Navy (Department of the Navy) Army (Department of the Army)	$5,933,131	0.7%	Rank history: not on the FY2021–FY2023 lists and #9 in FY2025; up 125 since FY2023.
9	Parsons Corporation Through Parsons Government Services Inc. Top agencies DOL (Department of Labor)	$5,592,051	0.7%	Rank history: #3 in FY2021, #3 in FY2022, #14 in FY2023 and not on the FY2025 list; up 5 since FY2023.
10	Summer Consultants Inc Top agencies GSA (General Services Administration) SSA (Social Security Administration) AOUSC (Administrative Office of the U.S. Courts)	$5,538,652	0.7%	Rank history: not on the FY2021–FY2022 lists, #13 in FY2023 and #31 in FY2025; up 3 since FY2023.
11	Smithgroup, Inc. Top agencies GSA (General Services Administration)	$5,463,098	0.7%	Rank history: not on the FY2021–FY2023 lists and #11 in FY2025; new.
12	Mtfa Architecture, P.L.L.C. Top agencies Navy (Department of the Navy) AOUSC (Administrative Office of the U.S. Courts) GSA (General Services Administration)	$4,877,622	0.6%	Rank history: #43 in FY2021, #21 in FY2022, #21 in FY2023 and #16 in FY2025; up 9 since FY2023.
13	Cremer Global Services, Incorporated Top agencies DHS (Department of Homeland Security)	$4,873,790	0.6%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2025; new.
14	N.K. Bhandari Architecture & Engineering P.C. 2 awardees Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) Treasury (Department of the Treasury)	$4,733,392	0.6%	Rank history: #56 in FY2021, #73 in FY2022, #25 in FY2023 and #15 in FY2025; up 11 since FY2023.
15	Biscayne Contractors, Inc. Top agencies DOJ (Department of Justice)	$4,663,860	0.6%	Rank history: not on the FY2021–FY2023 lists and #72 in FY2025; new.
16	Capital Brand Group LLC Top agencies Navy (Department of the Navy)	$4,065,556	0.5%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2025; new.
17	Page Federal Solutions, LLC 2 awardees, including Davis Brody Bond, LLP Top agencies GSA (General Services Administration) DOS (Department of State)	$3,800,863	0.5%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2025; new.
18	Line and Space, LLC Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$3,509,680	0.4%	Rank history: #23 in FY2021, #33 in FY2022, #18 in FY2023 and #26 in FY2025; unchanged since FY2023.
19	Wiley Wilson Burns & Mcdonnell Joint Venture Top agencies Navy (Department of the Navy)	$2,722,730	0.3%	Rank history: #39 in FY2021, #58 in FY2022, #42 in FY2023 and #56 in FY2025; up 23 since FY2023.
20	Marvel Architects Landscape Architects Urban Designers PLLC Top agencies GSA (General Services Administration)	$2,672,849	0.3%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2023 and #7 in FY2025; up 48 since FY2023.
21	Belinda Stewart Architects, Pa Top agencies GSA (General Services Administration)	$2,574,304	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
22	Bhate Environmental Associates, Inc. Top agencies USAF (Department of the Air Force)	$2,456,496	0.3%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2025; new.
23	Duvall Decker Architects, P.A Top agencies GSA (General Services Administration)	$2,223,005	0.3%	Rank history: not on the FY2021–FY2023 lists and #91 in FY2025; new.
24	Wiss, Janney, Elstner Associates, Inc. Top agencies GSA (General Services Administration)	$1,827,937	0.2%	Rank history: not on the FY2021 list, #62 in FY2022, #55 in FY2023 and #44 in FY2025; up 31 since FY2023.
25	Enercon Ltd Top agencies GSA (General Services Administration) HHS (Department of Health and Human Services) SSA (Social Security Administration)	$1,755,572	0.2%	Rank history: #55 in FY2021, #59 in FY2022, #56 in FY2023 and #57 in FY2025; up 31 since FY2023.
26	Development One Inc Top agencies AOUSC (Administrative Office of the U.S. Courts) GSA (General Services Administration) DCMA (Defense Contract Management Agency)	$1,747,701	0.2%	Rank history: not on the FY2021 list, #74 in FY2022, #29 in FY2023 and #93 in FY2025; up 3 since FY2023.
27	AECOM Technical Services, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$1,720,580	0.2%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2025; new.
28	Grunley Construction Co., Inc. Top agencies USDA (Department of Agriculture)	$1,700,267	0.2%	Rank history: not on the FY2021 list, #2 in FY2022, #24 in FY2023 and #41 in FY2025; down 4 since FY2023.
29	Setty & Associates International PLLC Top agencies GSA (General Services Administration) Commerce (Department of Commerce)	$1,641,981	0.2%	Rank history: #70 in FY2021, #26 in FY2022, #32 in FY2023 and not on the FY2025 list; up 3 since FY2023.
30	G.h. Forbes Associates Architects, P.C. Top agencies GSA (General Services Administration) DOJ (Department of Justice) Treasury (Department of the Treasury)	$1,596,738	0.2%	Rank history: #28 in FY2021, #50 in FY2022, #63 in FY2023 and #35 in FY2025; up 33 since FY2023.
31	Hellmuth, Obata & Kassabaum, Inc. Top agencies GSA (General Services Administration)	$1,573,126	0.2%	Rank history: not on the FY2021–FY2023 lists and #3 in FY2025; new.
32	Rosche / 888 First Street, N.e. L.L.C. Top agencies DOE (Department of Energy)	$1,391,269	0.2%	Rank history: #37 in FY2021, #36 in FY2022, #40 in FY2023 and #27 in FY2025; up 8 since FY2023.
33	Advanced Engineering Consultants Ltd. Through Advanced Engineering Consultants PLLC Top agencies GSA (General Services Administration) NARA (National Archives and Records Administration) DFAS (Defense Finance and Accounting Service)	$1,311,484	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
34	Occupational Training Center of Burlington County Top agencies USAF (Department of the Air Force)	$1,283,505	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
35	Caddell Construction Co. (De), LLC Top agencies DOS (Department of State)	$1,276,975	0.2%	Rank history: not on the FY2021–FY2023 lists and #49 in FY2025; new.
36	Westeast Design Group, LLC Top agencies USAF (Department of the Air Force)	$1,247,844	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
37	Bailey Edward Design, Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DHS (Department of Homeland Security)	$1,222,006	0.1%	Rank history: #46 in FY2021, #34 in FY2022, #35 in FY2023 and #59 in FY2025; down 2 since FY2023.
38	Studio Petretti Architecture, LLC Top agencies AOUSC (Administrative Office of the U.S. Courts) GSA (General Services Administration)	$1,202,773	0.1%	Rank history: not on the FY2021–FY2023 lists and #88 in FY2025; new.
39	Architrave P.C. Top agencies GSA (General Services Administration) Commerce (Department of Commerce)	$1,142,208	0.1%	Rank history: not on the FY2021 list, #39 in FY2022, #94 in FY2023 and not on the FY2025 list; up 55 since FY2023.
40	MGA Partners LLC Top agencies GSA (General Services Administration)	$1,060,672	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
41	Oak Point Associates Top agencies GSA (General Services Administration) DOS (Department of State) DOJ (Department of Justice)	$1,052,514	0.1%	Rank history: #24 in FY2021, #25 in FY2022, #37 in FY2023 and not on the FY2025 list; down 4 since FY2023.
42	AECOM 3 awardees, including AECOM Services, Inc. Top agencies Navy (Department of the Navy) DOS (Department of State)	$1,025,821	0.1%	Rank history: #5 in FY2021, #11 in FY2022, #51 in FY2023 and not on the FY2025 list; up 9 since FY2023.
43	HDR Environmental, Operations and Construction, Inc. Top agencies USAF (Department of the Air Force)	$949,675	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
44	Baysinger-Bric JV Top agencies GSA (General Services Administration) DOJ (Department of Justice) SSA (Social Security Administration)	$919,680	0.1%	Rank history: #100 in FY2021, #42 in FY2022, #87 in FY2023 and #69 in FY2025; up 43 since FY2023.
45	Davis Brody Bond-Spacesmith A Joint Venture Top agencies GSA (General Services Administration)	$911,470	0.1%	Rank history: not on the FY2021 list, #30 in FY2022, #6 in FY2023 and #19 in FY2025; down 39 since FY2023.
46	Symmes Maini & Mckee Associates Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$907,912	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 61 since FY2023.
47	ECH Architecture PS Top agencies GSA (General Services Administration) DOJ (Department of Justice)	$863,140	0.1%	Rank history: not on the FY2021 list, #93 in FY2022, #76 in FY2023 and not on the FY2025 list; up 29 since FY2023.
48	Smith-Miller + Hawkinson Architects, LLP Top agencies GSA (General Services Administration)	$852,623	0.1%	Rank history: not on the FY2021 list, #18 in FY2022, #45 in FY2023 and #4 in FY2025; down 3 since FY2023.
49	EBL Engineers, LLC Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) GSA (General Services Administration)	$850,876	0.1%	Rank history: #50 in FY2021, #53 in FY2022, #57 in FY2023 and not on the FY2025 list; up 8 since FY2023.
50	KOO LLC Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$793,345	0.1%	Rank history: #88 in FY2021, #51 in FY2022, #54 in FY2023 and #98 in FY2025; up 4 since FY2023.
51	Atkinsrealis USA Inc. Top agencies Army (Department of the Army)	$784,141	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
52	Alares LLC Top agencies GSA (General Services Administration)	$770,731	0.1%	Rank history: #57 in FY2021, #43 in FY2022, not on the FY2023 list and not on the FY2025 list; up 52 since FY2023.
53	Burns Wald-Hopkins Shambach Architects, Inc. Top agencies USAF (Department of the Air Force)	$722,998	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 52 since FY2023.
54	Kekolu Contracting, LLC Top agencies USAF (Department of the Air Force)	$715,293	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
55	Imec Group, LLC Top agencies DOL (Department of Labor)	$707,693	0.1%	Rank history: #76 in FY2021, not on the FY2022 list, #52 in FY2023 and not on the FY2025 list; down 3 since FY2023.
56	Bbix LLC Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) Treasury (Department of the Treasury)	$687,615	0.1%	Rank history: not on the FY2021–FY2022 lists, #60 in FY2023 and #79 in FY2025; up 4 since FY2023.
57	Mills & Schnoering Architects LLC Top agencies GSA (General Services Administration) NLRB (National Labor Relations Board) AOUSC (Administrative Office of the U.S. Courts)	$680,193	0.1%	Rank history: not on the FY2021 list, #64 in FY2022, #71 in FY2023 and not on the FY2025 list; up 14 since FY2023.
58	Steven Kahle Architects, Inc. Top agencies GSA (General Services Administration) DOI (Department of the Interior) DOS (Department of State)	$662,488	0.1%	Rank history: #67 in FY2021, #40 in FY2022, #97 in FY2023 and #99 in FY2025; up 39 since FY2023.
59	K2A, LLP Top agencies GSA (General Services Administration)	$611,629	0.1%	Rank history: #68 in FY2021, #45 in FY2022, #82 in FY2023 and not on the FY2025 list; up 23 since FY2023.
60	Morphosis Architects Top agencies GSA (General Services Administration)	$606,282	0.1%	Rank history: #49 in FY2021, not on the FY2022 list, #19 in FY2023 and #45 in FY2025; down 41 since FY2023.
61	Snow Kreilich Architects Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice) DHS (Department of Homeland Security)	$587,674	0.1%	Rank history: not on the FY2021 list, #100 in FY2022, #3 in FY2023 and #18 in FY2025; down 58 since FY2023.
62	Caddell Construction Co., Inc. Through Caddell Construction Co. (De), LLC Top agencies DOS (Department of State)	$568,373	0.1%	Rank history: #14 in FY2021, #37 in FY2022, #11 in FY2023 and not on the FY2025 list; down 51 since FY2023.
63	Page Southerland Page, Inc. 2 awardees, including Page Federal Solutions, LLC Top agencies DHS (Department of Homeland Security) DOS (Department of State)	$563,625	0.1%	Rank history: not on the FY2021 list, #31 in FY2022, #65 in FY2023 and #17 in FY2025; up 2 since FY2023.
64	Mason & Hanger-Pond Joint Venture LP Top agencies Army (Department of the Army)	$557,447	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
65	MBF Architects, P.a. Top agencies Navy (Department of the Navy)	$553,568	0.1%	Rank history: #42 in FY2021, not on the FY2022 list, #91 in FY2023 and not on the FY2025 list; up 26 since FY2023.
66	Raymond Pond Enterprise Solutions JV LLC Top agencies USAF (Department of the Air Force)	$540,279	0.1%	Rank history: not on the FY2021 list, #68 in FY2022, #83 in FY2023 and not on the FY2025 list; up 17 since FY2023.
67	Henry Adams, LLC Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) SSA (Social Security Administration)	$530,430	0.1%	Rank history: #20 in FY2021, #44 in FY2022, #88 in FY2023 and not on the FY2025 list; up 21 since FY2023.
68	Kyowa Technologies Co.,Ltd. Top agencies Navy (Department of the Navy)	$526,967	0.1%	Rank history: #73 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 108 since FY2023.
69	Elevar Design Group Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DHS (Department of Homeland Security)	$517,344	0.1%	Rank history: #66 in FY2021, #67 in FY2022, #50 in FY2023 and #68 in FY2025; down 19 since FY2023.
70	Romanyk Consulting Corporation Top agencies VA (Department of Veterans Affairs)	$515,960	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 86 since FY2023.
71	Krueck & Sexton Architects, Ltd Top agencies GSA (General Services Administration)	$513,138	0.1%	Rank history: #4 in FY2021, #46 in FY2022, not on the FY2023 list and #52 in FY2025; up 84 since FY2023.
72	Seay Seay & Litchfield PC Top agencies USAF (Department of the Air Force)	$500,009	0.1%	Rank history: #27 in FY2021, #99 in FY2022, #44 in FY2023 and not on the FY2025 list; down 28 since FY2023.
73	WSP USA Environment & Infrastructure Inc. Top agencies Navy (Department of the Navy)	$492,963	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
74	HOK Group, Inc. Through Hellmuth, Obata & Kassabaum, Inc. Top agencies GSA (General Services Administration)	$476,271	0.1%	Rank history: #52 in FY2021, #65 in FY2022, #39 in FY2023 and not on the FY2025 list; down 35 since FY2023.
75	Mason Architects, Inc. Top agencies DODIG (Department of Defense Inspector General) DHS (Department of Homeland Security) DOS (Department of State)	$449,938	0.1%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2025; up 43 since FY2023.
76	KAL Architects, Inc. Top agencies USAF (Department of the Air Force)	$445,266	0.1%	Rank history: #58 in FY2021, not on the FY2022–FY2023 lists and #74 in FY2025; returned.
77	Design Partners, Incorporated Top agencies Navy (Department of the Navy)	$442,441	0.1%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023 and not on the FY2025 list; up 4 since FY2023.
78	Miller-Remick, LLC Top agencies GSA (General Services Administration)	$437,086	0.1%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023 and #61 in FY2025; up 1 since FY2023.
79	Ch2M Hill - HDR JV Top agencies USAF (Department of the Air Force)	$434,938	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
80	Bell Architects, P.C Top agencies GSA (General Services Administration) DOJ (Department of Justice)	$399,160	<0.1%	Rank history: #38 in FY2021, #47 in FY2022, not on the FY2023 list and not on the FY2025 list; up 44 since FY2023.
81	Peak Resource Conservation Inc. Top agencies GSA (General Services Administration)	$378,859	<0.1%	Rank history: #74 in FY2021, #32 in FY2022, not on the FY2023 list and not on the FY2025 list; up 27 since FY2023.
82	FFE - Heapy JV, LLC Top agencies VA (Department of Veterans Affairs)	$372,593	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
83	Engineering Design Management P.C. Top agencies GSA (General Services Administration) DHS (Department of Homeland Security)	$363,033	<0.1%	Rank history: #60 in FY2021, #76 in FY2022, #80 in FY2023 and not on the FY2025 list; down 3 since FY2023.
84	Chickasaw Defense Logistics, LLC Top agencies Army (Department of the Army)	$361,892	<0.1%	Rank history: #9 in FY2021, #4 in FY2022, #8 in FY2023 and not on the FY2025 list; down 76 since FY2023.
85	Swan Contracting LLC Top agencies USAF (Department of the Air Force)	$348,198	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	Colby Co LLC Top agencies GSA (General Services Administration) DOJ (Department of Justice) DHS (Department of Homeland Security)	$334,116	<0.1%	Rank history: #77 in FY2021, #52 in FY2022, not on the FY2023 list and #62 in FY2025; returned.
87	Perkins Eastman Architects DPC Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) SSA (Social Security Administration)	$326,185	<0.1%	Rank history: #21 in FY2021, #55 in FY2022, #59 in FY2023 and not on the FY2025 list; down 28 since FY2023.
88	Bbco Design LLC Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts)	$323,195	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
89	EXP U.s. Services Inc. Top agencies DOT (Department of Transportation)	$310,178	<0.1%	Rank history: not on the FY2021–FY2023 lists and #63 in FY2025; new.
90	The Johnson-Mcadams Firm, P.a. Top agencies USAF (Department of the Air Force) USDA (Department of Agriculture)	$305,451	<0.1%	Rank history: not on the FY2021 list, #89 in FY2022, #38 in FY2023 and not on the FY2025 list; down 52 since FY2023.
91	Raths Raths & Johnson Inc. Top agencies GSA (General Services Administration)	$303,352	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
92	Neumann Monson, Inc. Top agencies GSA (General Services Administration)	$302,551	<0.1%	Rank history: not on the FY2021 list, #82 in FY2022, not on the FY2023 list and not on the FY2025 list; up 73 since FY2023.
93	Merrick & Company Top agencies USAF (Department of the Air Force)	$298,002	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
94	Prime AE Group, Inc. Top agencies Army (Department of the Army)	$290,684	<0.1%	Rank history: #75 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 49 since FY2023.
95	RMA Architects Inc. Top agencies DHS (Department of Homeland Security)	$287,737	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
96	Kenneth Hahn Architects Inc. Top agencies USAF (Department of the Air Force)	$286,680	<0.1%	Rank history: #47 in FY2021, #66 in FY2022, not on the FY2023 list and #73 in FY2025; up 82 since FY2023.
97	Beardsley Design Associates Architecture, Engineering, Landscape Architecture, D.p.c. Top agencies GSA (General Services Administration) DOJ (Department of Justice)	$283,664	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 64 since FY2023.
98	Hok, Inc. Top agencies MCC (Millennium Challenge Corporation)	$278,197	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
99	WSP E&I - Zapata Joint Venture Top agencies USAF (Department of the Air Force)	$278,053	<0.1%	Rank history: not on the FY2021–FY2022 lists, #31 in FY2023 and #30 in FY2025; down 68 since FY2023.
100	Ati, Inc. Top agencies HHS (Department of Health and Human Services)	$273,575	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.

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100 of 223 contractors listed here. See the rest on GovTribe.

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 $830 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 C1AA contractors in FY2024?

1. Brasfield & Gorrie LLC ($512M), 2. B.l. Harbert Holdings, L.L.C. ($118M), 3. Dattner Architects DPC ($19.7M), 4. Teya Support Services LLC ($13M), 5. Burns & Mcdonnell, Inc. ($11M), 6. Trane U.s. Inc. ($8.9M), 7. BL Harbert International LLC ($8.11M), 8. Jacobs Government Services Company ($5.93M), 9. Parsons Corporation ($5.59M), 10. Summer Consultants Inc ($5.54M).

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