Top 100 Smithsonian Institution Contractors, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Clark / Smoot / Consigli, A Joint Venture Top NAICS codes 236220 Commercial and Institutional Building Construction 712110 Museums	$41,067,389	10.5%	Rank history: #2 in FY2022, #5 in FY2023, #12 in FY2024 and #4 in FY2025; unchanged since FY2020.
2	TEX / Am Construction Co., Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$36,157,024	9.2%	Rank history: #7 in FY2022, #11 in FY2023, #27 in FY2024 and #17 in FY2025; up 5 since FY2020.
3	Grunley Construction Co., Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$34,628,275	8.8%	Rank history: #8 in FY2022, #8 in FY2023, #2 in FY2024 and #6 in FY2025; down 1 since FY2020.
4	Universal Protection GP, LLC Through Universal Protection Service, Limited Partnership Top NAICS codes 561612 Security Guards and Patrol Services	$19,155,000	4.9%	Rank history: #1 in FY2022, #3 in FY2023, #21 in FY2024 and not on the FY2025 list; up 4 since FY2020.
5	Lend Lease Corporation Ltd 2 awardees, including Lendlease (Us) Construction Inc. Top NAICS codes 541310 Architectural Services 541330 Engineering Services	$18,191,128	4.6%	Rank history: #6 in FY2022, #9 in FY2023, #8 in FY2024 and not on the FY2025 list; up 27 since FY2020.
6	Page-Loring LLC Top NAICS codes 541310 Architectural Services	$17,046,917	4.3%	Rank history: #16 in FY2022, #28 in FY2023, #38 in FY2024 and not on the FY2025 list; down 3 since FY2020.
7	Raad Construction Group LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 238220 Plumbing, Heating, and Air-Conditioning Contractors	$13,270,442	3.4%	Rank history: not on the FY2022–FY2025 lists; up 53 since FY2020.
8	Exelon Corporation 6 awardees, including Potomac Electric Power Co, Constellation Newenergy Inc. and Baltimore Gas and Electric Company Top NAICS codes 221122 Electric Power Distribution 236220 Commercial and Institutional Building Construction 541330 Engineering Services	$12,956,475	3.3%	Rank history: #4 in FY2022, #7 in FY2023, #7 in FY2024 and not on the FY2025 list; up 2 since FY2020.
9	Associated Builders, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$9,702,742	2.5%	Rank history: #3 in FY2022, #2 in FY2023, #65 in FY2024 and not on the FY2025 list; down 4 since FY2020.
10	Biscayne Contractors, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$9,327,188	2.4%	Rank history: #9 in FY2022, #56 in FY2023, #16 in FY2024 and #7 in FY2025; up 79 since FY2020.
11	Ayers / Saint / Gross, Incorporated Top NAICS codes 541310 Architectural Services	$5,810,544	1.5%	Rank history: #11 in FY2022, #16 in FY2023, #28 in FY2024 and #71 in FY2025; up 23 since FY2020.
12	Knowcean Consulting Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$4,806,853	1.2%	Rank history: #20 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
13	Cinnabar Inc Through Cinnabar California, Inc. Top NAICS codes 712110 Museums	$4,703,388	1.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
14	Huang-Cfm Joint Venture Top NAICS codes 236220 Commercial and Institutional Building Construction	$4,377,129	1.1%	Rank history: #51 in FY2022, #18 in FY2023, #30 in FY2024 and #58 in FY2025; down 5 since FY2020.
15	KEE Construction Services, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$3,499,478	0.9%	Rank history: #15 in FY2022, #47 in FY2023, #36 in FY2024 and #68 in FY2025; up 41 since FY2020.
16	Dell Federal Systems L.P. 2 awardees, including Dell Marketing L.P. Top NAICS codes 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers 334111 Electronic Computer Manufacturing 443142 Electronics Stores	$3,177,941	0.8%	Rank history: #21 in FY2022, #31 in FY2023, #100 in FY2024 and not on the FY2025 list; up 14 since FY2020.
17	Tucson Building & Remodeling, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$3,093,395	0.8%	Rank history: #43 in FY2022, #78 in FY2023, #48 in FY2024 and #60 in FY2025; up 24 since FY2020.
18	Severn Associates LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$3,081,016	0.8%	Rank history: not on the FY2022 list, #53 in FY2023, #95 in FY2024 and #14 in FY2025; down 3 since FY2020.
19	Belt Built Contracting, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$2,997,168	0.8%	Rank history: #24 in FY2022, #26 in FY2023, #60 in FY2024 and #85 in FY2025; down 5 since FY2020.
20	Noresco LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$2,893,127	0.7%	Rank history: #26 in FY2022, not on the FY2023 list, #29 in FY2024 and #25 in FY2025; up 43 since FY2020.
21	Oakland Consulting Group Inc. Top NAICS codes 541512 Computer Systems Design Services	$2,707,842	0.7%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
22	Infostructures, Inc. Top NAICS codes 541513 Computer Facilities Management Services 519130 Internet Publishing and Broadcasting and Web Search Portals 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$2,575,767	0.7%	Rank history: #18 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
23	HSU Development, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$2,417,125	0.6%	Rank history: #19 in FY2022, #20 in FY2023, #63 in FY2024 and #52 in FY2025; up 29 since FY2020.
24	B3 Enterprises LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$2,301,209	0.6%	Rank history: #17 in FY2022, #27 in FY2023, #53 in FY2024 and not on the FY2025 list; up 54 since FY2020.
25	WGL Energy Services Inc. 2 awardees, including Washington Gas Light Company Top NAICS codes 221210 Natural Gas Distribution	$2,287,674	0.6%	Rank history: #29 in FY2022, #29 in FY2023, #35 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
26	Sierrita Mining & Ranching Company LP Top NAICS codes 236220 Commercial and Institutional Building Construction	$2,225,683	0.6%	Rank history: #35 in FY2022, #64 in FY2023, not on the FY2024 list and #55 in FY2025; up 5 since FY2020.
27	AECOM Through URS Group Inc-Hartman Cox Architects LLP A Joint Venture Top NAICS codes 541310 Architectural Services	$2,191,706	0.6%	Rank history: #50 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 16 since FY2020.
28	Iron Bow Technologies, LLC Top NAICS codes 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers	$2,042,928	0.5%	Rank history: not on the FY2022–FY2025 lists; up 104 since FY2020.
29	Lighting Services, Inc. Top NAICS codes 712110 Museums 335129 Other Lighting Equipment Manufacturing	$2,041,225	0.5%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
30	Westerly Enterprises, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$1,765,366	0.4%	Rank history: #95 in FY2022, #74 in FY2023, #80 in FY2024 and not on the FY2025 list; up 50 since FY2020.
31	Elcon Enterprises Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction 238290 Other Building Equipment Contractors	$1,759,028	0.4%	Rank history: #45 in FY2022, #19 in FY2023, #32 in FY2024 and #75 in FY2025; down 9 since FY2020.
32	Trident Builders, LLC Top NAICS codes 541310 Architectural Services	$1,743,026	0.4%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
33	Quotientsub LLC Top NAICS codes 519130 Internet Publishing and Broadcasting and Web Search Portals 541519 Other Computer Related Services	$1,736,098	0.4%	Rank history: #30 in FY2022, #33 in FY2023, #26 in FY2024 and #21 in FY2025; down 8 since FY2020.
34	KEYCORP Through Key Government Finance, Inc. Top NAICS codes 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers	$1,638,082	0.4%	Rank history: #38 in FY2022, not on the FY2023 list, #54 in FY2024 and not on the FY2025 list; up 86 since FY2020.
35	Dominion Resources Inc. Through Virginia Electric and Power Company Top NAICS codes 221122 Electric Power Distribution	$1,599,000	0.4%	Rank history: #69 in FY2022, #37 in FY2023, #42 in FY2024 and #46 in FY2025; new, not ranked in FY2020.
36	Architrave P.C. Top NAICS codes 541310 Architectural Services	$1,561,082	0.4%	Rank history: #28 in FY2022, #44 in FY2023, #50 in FY2024 and #80 in FY2025; up 17 since FY2020.
37	Futrend Technology Inc. Top NAICS codes 611420 Computer Training	$1,433,721	0.4%	Rank history: #66 in FY2022, #39 in FY2023, #75 in FY2024 and #67 in FY2025; new, not ranked in FY2020.
38	Alliance Technology Group, LLC Top NAICS codes 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers	$1,423,511	0.4%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
39	Pifinity, Inc. Top NAICS codes 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers	$1,336,050	0.3%	Rank history: #48 in FY2022, #54 in FY2023, #61 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
40	Meltech Corporation, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$1,328,430	0.3%	Rank history: not on the FY2022 list, #85 in FY2023, #37 in FY2024 and not on the FY2025 list; down 11 since FY2020.
41	Som-Selldorf Architects - A Joint Venture Top NAICS codes 541310 Architectural Services	$1,298,774	0.3%	Rank history: not on the FY2022 list, #12 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
42	DJB Contracting Inc. Top NAICS codes 238160 Roofing Contractors	$1,193,304	0.3%	Rank history: #33 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; down 18 since FY2020.
43	Rife International, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 541690 Other Scientific and Technical Consulting Services	$1,190,183	0.3%	Rank history: not on the FY2022–FY2025 lists; up 49 since FY2020.
44	State of Arizona 2 awardees, including University of Arizona Top NAICS codes 611310 Colleges, Universities, and Professional Schools	$1,181,782	0.3%	Rank history: #54 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
45	Ewing Cole Inc. Top NAICS codes 541310 Architectural Services	$1,129,745	0.3%	Rank history: #13 in FY2022, #13 in FY2023, #10 in FY2024 and #12 in FY2025; down 26 since FY2020.
46	Puyenpa Services, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$1,126,298	0.3%	Rank history: not on the FY2022–FY2025 lists; up 76 since FY2020.
47	JRA & Associates Contracting, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$1,102,285	0.3%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; up 109 since FY2020.
48	Servicios Y Obras Seobra S.A.S. Top NAICS codes 236220 Commercial and Institutional Building Construction	$984,275	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	ECM Wise Corp Through Spacesaver Systems, Inc. Top NAICS codes 337214 Office Furniture (except Wood) Manufacturing 337215 Showcase, Partition, Shelving, and Locker Manufacturing 333999 All Other Miscellaneous General Purpose Machinery Manufacturing	$969,662	0.2%	Rank history: #49 in FY2022, #35 in FY2023, #9 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
50	Huang-Gaghan Joint Venture Top NAICS codes 236220 Commercial and Institutional Building Construction	$952,818	0.2%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
51	Kapstone Technologies, Inc. Top NAICS codes 541513 Computer Facilities Management Services	$940,296	0.2%	Rank history: #75 in FY2022, #72 in FY2023, not on the FY2024 list and #63 in FY2025; up 28 since FY2020.
52	Jacobs Engineering Group Inc. Through Jacobs Project Management Co Top NAICS codes 236220 Commercial and Institutional Building Construction	$918,619	0.2%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
53	Consolidated Edison Through Consolidated Edison Company of New York, Inc. Top NAICS codes 221122 Electric Power Distribution 221330 Steam and Air-Conditioning Supply	$914,000	0.2%	Rank history: #55 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
54	Samuel Anderson Architects Top NAICS codes 541310 Architectural Services	$903,300	0.2%	Rank history: not on the FY2022 list, #88 in FY2023 and not on the FY2024–FY2025 lists; up 97 since FY2020.
55	Federal Radio Service Top NAICS codes 334220 Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing 517311 Wired Telecommunications Carriers 517919 All Other Telecommunications	$848,120	0.2%	Rank history: not on the FY2022–FY2025 lists; up 16 since FY2020.
56	Aeon Preservation Services, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$827,674	0.2%	Rank history: not on the FY2022 list, #77 in FY2023, not on the FY2024 list and #97 in FY2025; up 39 since FY2020.
57	Quinn Evans Architects Inc. Top NAICS codes 541310 Architectural Services 541330 Engineering Services	$824,877	0.2%	Rank history: #58 in FY2022, #69 in FY2023, #25 in FY2024 and #56 in FY2025; down 30 since FY2020.
58	Tilt Up Construction, Inc. Top NAICS codes 541310 Architectural Services	$738,113	0.2%	Rank history: #34 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
59	Technology Trends Group, LLC Top NAICS codes 541618 Other Management Consulting Services 541519 Other Computer Related Services	$719,849	0.2%	Rank history: #25 in FY2022, #38 in FY2023, #39 in FY2024 and #36 in FY2025; up 8 since FY2020.
60	Mcdonough Bolyard Peck, Inc. Top NAICS codes 541350 Building Inspection Services	$711,509	0.2%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 104 since FY2020.
61	Applied Research Associates, Inc. Top NAICS codes 541330 Engineering Services	$703,857	0.2%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
62	Spacesaver Systems, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction 337215 Showcase, Partition, Shelving, and Locker Manufacturing 423420 Office Equipment Merchant Wholesalers	$701,952	0.2%	Rank history: not on the FY2022–FY2023 lists, #64 in FY2024 and #13 in FY2025; down 49 since FY2020.
63	Kunkel Construction, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$699,483	0.2%	Rank history: #53 in FY2022, #61 in FY2023, #49 in FY2024 and #22 in FY2025; up 13 since FY2020.
64	Siemens Aktiengesellschaft Through Siemens Industry Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction 423690 Other Electronic Parts and Equipment Merchant Wholesalers 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$695,443	0.2%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; down 52 since FY2020.
65	Repaintex Company Top NAICS codes 236220 Commercial and Institutional Building Construction	$672,380	0.2%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; down 26 since FY2020.
66	United Development USA Inc. Top NAICS codes 541513 Computer Facilities Management Services	$669,038	0.2%	Rank history: #67 in FY2022, #71 in FY2023, #70 in FY2024 and #86 in FY2025; up 2 since FY2020.
67	Global Biodiversity Information Facility Secretariat Top NAICS codes 712110 Museums	$650,000	0.2%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
68	Construcciones Y Mantenimientos Eficientes S.A. Top NAICS codes 236220 Commercial and Institutional Building Construction 236118 Residential Remodelers 238390 Other Building Finishing Contractors	$641,170	0.2%	Rank history: not on the FY2022–FY2025 lists; up 28 since FY2020.
69	Coalfire Systems, Inc. Through Veris Group, LLC Top NAICS codes 812990 All Other Personal Services	$622,604	0.2%	Rank history: #78 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
70	Trueblue, Inc. Through Peopleready Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 561320 Temporary Help Services	$618,754	0.2%	Rank history: #71 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
71	Ruchman and Associates, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$573,733	0.1%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
72	Goldbelt, Incorporated Through Peregrine Technical Solutions, LLC Top NAICS codes 541513 Computer Facilities Management Services	$569,026	0.1%	Rank history: not on the FY2022–FY2025 lists; up 115 since FY2020.
73	The Donohoe Companies. Inc. Through AAA Complete Building Services Inc. Top NAICS codes 561210 Facilities Support Services	$563,368	0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; down 23 since FY2020.
74	Serco North America (Holdings) Inc Through Serco Inc. Top NAICS codes 541513 Computer Facilities Management Services	$560,980	0.1%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
75	CLC Cabling Service, Inc. Top NAICS codes 541513 Computer Facilities Management Services	$555,367	0.1%	Rank history: #41 in FY2022, #65 in FY2023, #82 in FY2024 and #62 in FY2025; up 23 since FY2020.
76	Cho, Benn, Holback & Associates, Inc. Top NAICS codes 541310 Architectural Services	$544,163	0.1%	Rank history: not on the FY2022–FY2023 lists, #47 in FY2024 and not on the FY2025 list; down 29 since FY2020.
77	Carahsoft Technology Corp Top NAICS codes 541519 Other Computer Related Services 511210 Software Publishers 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers	$531,507	0.1%	Rank history: #56 in FY2022, #55 in FY2023, #69 in FY2024 and #73 in FY2025; down 13 since FY2020.
78	LJB Inc. Top NAICS codes 541330 Engineering Services	$518,897	0.1%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
79	Forum One Communications Corp Top NAICS codes 519130 Internet Publishing and Broadcasting and Web Search Portals	$511,810	0.1%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; up 199 since FY2020.
80	Ford Agency, Inc. (The) Top NAICS codes 561110 Office Administrative Services 561320 Temporary Help Services	$507,330	0.1%	Rank history: not on the FY2022–FY2025 lists; up 106 since FY2020.
81	Air Services, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$496,495	0.1%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
82	Hawaii Electric Light Company Inc. Top NAICS codes 221112 Fossil Fuel Electric Power Generation	$475,000	0.1%	Rank history: #80 in FY2022, #99 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
83	RBA Group the Through NV5 Consultants, Inc. Top NAICS codes 541350 Building Inspection Services	$467,191	0.1%	Rank history: not on the FY2022–FY2024 lists and #57 in FY2025; up 327 since FY2020.
84	Servicenow, Inc. Top NAICS codes 541511 Custom Computer Programming Services	$456,779	0.1%	Rank history: #86 in FY2022, #89 in FY2023, #89 in FY2024 and #93 in FY2025; down 2 since FY2020.
85	Agile Defense, LLC Top NAICS codes 812990 All Other Personal Services	$447,687	0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
86	Axiell ALM Canada Inc Top NAICS codes 541511 Custom Computer Programming Services 511210 Software Publishers 519120 Libraries and Archives	$446,931	0.1%	Rank history: not on the FY2022–FY2025 lists; up 11 since FY2020.
87	Fresco, Inc. Top NAICS codes 561790 Other Services to Buildings and Dwellings	$444,334	0.1%	Rank history: not on the FY2022–FY2025 lists; up 218 since FY2020.
88	Burns Wald-Hopkins Shambach Architects, Inc. Top NAICS codes 541310 Architectural Services	$431,316	0.1%	Rank history: #63 in FY2022, #94 in FY2023 and not on the FY2024–FY2025 lists; down 44 since FY2020.
89	Thermo Electron Corporation 4 awardees, including Thermo Electron North America LLC, FEI Company and Fisher Scientific Company L.L.C. Top NAICS codes 334516 Analytical Laboratory Instrument Manufacturing 811219 Other Electronic and Precision Equipment Repair and Maintenance 423490 Other Professional Equipment and Supplies Merchant Wholesalers	$417,825	0.1%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
90	Gwwo, Inc. Top NAICS codes 541310 Architectural Services	$416,253	0.1%	Rank history: not on the FY2022 list, #48 in FY2023, not on the FY2024 list and #53 in FY2025; down 35 since FY2020.
91	Cloudburst Security LLC Top NAICS codes 812990 All Other Personal Services	$415,554	0.1%	Rank history: #83 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
92	Constructora Rogers, S.A. (Conrosa) Top NAICS codes 236220 Commercial and Institutional Building Construction	$410,324	0.1%	Rank history: #61 in FY2022, not on the FY2023–FY2024 lists and #23 in FY2025; up 80 since FY2020.
93	Congruity 360, LLC Top NAICS codes 541519 Other Computer Related Services	$399,223	0.1%	Rank history: not on the FY2022–FY2025 lists; up 162 since FY2020.
94	Nisource Inc. Through Columbia Gas of Virginia, Inc. Top NAICS codes 221210 Natural Gas Distribution	$389,000	0.1%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
95	Engineering Partners, Inc. Top NAICS codes 541310 Architectural Services	$387,948	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	RCK Controls Inc. Top NAICS codes 541512 Computer Systems Design Services	$386,100	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Fill Holdings LLC Top NAICS codes 812320 Drycleaning and Laundry Services (except Coin-Operated)	$381,587	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Insight Public Sector Inc. Top NAICS codes 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers	$381,352	0.1%	Rank history: not on the FY2022 list, #84 in FY2023 and not on the FY2024–FY2025 lists; up 95 since FY2020.
99	CDW Corporation Through CDW Government LLC Top NAICS codes 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers 334112 Computer Storage Device Manufacturing 334111 Electronic Computer Manufacturing	$379,228	0.1%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; up 13 since FY2020.
100	Washington Suburban Sanitary Commission Top NAICS codes 221310 Water Supply and Irrigation Systems	$366,000	0.1%	Rank history: #98 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.

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 $393 million obligated before deobligations, so they never pass 100%.
• Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
• Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
• Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
• Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
• Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers