Top 100 Department of the Interior Contractors, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Camp Dresser & Mckee Inc. 4 awardees, including CDM Constructors Inc. and CDM Federal Programs Corporation Top NAICS codes 237110 Water and Sewer Line and Related Structures Construction 541620 Environmental Consulting Services 541330 Engineering Services	$66,660,184	1.5%	Rank history: not on the FY2022–FY2024 lists and #6 in FY2025; new, not ranked in FY2020.
2	Kbr, Inc. 3 awardees, including KBR Wyle Services, LLC Top NAICS codes 541513 Computer Facilities Management Services 541511 Custom Computer Programming Services 541330 Engineering Services	$66,418,904	1.5%	Rank history: #6 in FY2022, #6 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
3	Accenture Federal Services LLC 4 awardees, including Accenture LLP Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services	$39,248,450	0.9%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
4	Tepa, LLC 3 awardees, including Tepa EC, LLC, Tehama, LLC and Tehama ECS LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 562910 Remediation Services 541350 Building Inspection Services	$35,582,480	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
5	Arctic Slope Regional Corporation 7 awardees, including EQM Services, LLC, Asrc Consulting & Environmental Services, LLC and Vistronix, LLC Top NAICS codes 238910 Site Preparation Contractors 213112 Support Activities for Oil and Gas Operations 541519 Other Computer Related Services	$32,459,446	0.7%	Rank history: #33 in FY2022, #40 in FY2023, #68 in FY2024 and #18 in FY2025; up 85 since FY2020.
6	Cherokee Nation 5 awardees, including Cherokee CRC LLC, Cherokee Federal Solutions, L.L.C. and Cherokee Nation Management & Consulting, L.l.c.. Top NAICS codes 236220 Commercial and Institutional Building Construction 541513 Computer Facilities Management Services 541512 Computer Systems Design Services	$32,004,866	0.7%	Rank history: #14 in FY2022, #2 in FY2023, not on the FY2024 list and #78 in FY2025; up 7 since FY2020.
7	C.A.R.P.I. U.S.a. Inc. Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$31,247,964	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
8	RBA Group the 3 awardees, including NV5 Geospatial, Inc., Whpacific, Inc. and Nv5, Inc. Top NAICS codes 541360 Geophysical Surveying and Mapping Services 541370 Surveying and Mapping (except Geophysical) Services 541330 Engineering Services	$31,168,767	0.7%	Rank history: #10 in FY2022, #12 in FY2023, not on the FY2024 list and #19 in FY2025; up 4 since FY2020.
9	ERA Helicopters LLC Through Bristow LLC Top NAICS codes 481211 Nonscheduled Chartered Passenger Air Transportation	$30,971,916	0.7%	Rank history: #22 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
10	Perimeter Solutions LP Top NAICS codes 115310 Support Activities for Forestry 325314 Fertilizer (Mixing Only) Manufacturing	$29,412,800	0.7%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
11	Sealaska Corporation 2 awardees, including Managed Business Solutions LLC and Sealaska Constructors LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 541690 Other Scientific and Technical Consulting Services 541519 Other Computer Related Services	$27,428,263	0.6%	Rank history: #9 in FY2022, #4 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
12	J. Benton Construction, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 236118 Residential Remodelers	$27,263,300	0.6%	Rank history: not on the FY2022–FY2025 lists; up 23 since FY2020.
13	Countertrade Products, Inc. Top NAICS codes 334111 Electronic Computer Manufacturing 541519 Other Computer Related Services	$26,630,101	0.6%	Rank history: #11 in FY2022, #13 in FY2023, #11 in FY2024 and #28 in FY2025; down 3 since FY2020.
14	Dell Federal Systems L.P. 2 awardees Top NAICS codes 541519 Other Computer Related Services 334111 Electronic Computer Manufacturing	$26,534,588	0.6%	Rank history: #48 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
15	Ames Construction, Inc. Top NAICS codes 237990 Other Heavy and Civil Engineering Construction 238110 Poured Concrete Foundation and Structure Contractors	$26,001,194	0.6%	Rank history: #25 in FY2022, not on the FY2023–FY2024 lists and #4 in FY2025; up 10 since FY2020.
16	E S Wagner Co Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$24,964,290	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
17	Walga Ross Group JV Top NAICS codes 236220 Commercial and Institutional Building Construction	$24,070,218	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Southland Holdings LLC Through Oscar Renda Contracting Inc. Top NAICS codes 237110 Water and Sewer Line and Related Structures Construction	$23,844,075	0.5%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
19	Nuaxis LLC Top NAICS codes 541519 Other Computer Related Services 541512 Computer Systems Design Services	$23,203,844	0.5%	Rank history: #31 in FY2022, #48 in FY2023, #22 in FY2024 and #63 in FY2025; down 15 since FY2020.
20	CACI International Inc. 4 awardees, including Caci, Inc. - Federal Top NAICS codes 541519 Other Computer Related Services 541512 Computer Systems Design Services	$21,792,728	0.5%	Rank history: not on the FY2022 list, #28 in FY2023, #41 in FY2024 and #37 in FY2025; down 13 since FY2020.
21	Hensel Phelps Construction Co Top NAICS codes 236220 Commercial and Institutional Building Construction	$21,676,636	0.5%	Rank history: #8 in FY2022, not on the FY2023 list, #6 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
22	Verizon Communications Inc. 6 awardees, including Cellco Partnership, MCI Communications Services LLC and Verizon Business Network Services LLC Top NAICS codes 541519 Other Computer Related Services 517110 Wired Telecommunications Carriers 517312 Wireless Telecommunications Carriers (except Satellite)	$21,365,728	0.5%	Rank history: #39 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
23	Lumen Technologies, Inc. 8 awardees, including Lumen Technologies Government Solutions, Inc., Level 3 Communications, LLC and Centurylink Communications, LLC Top NAICS codes 517110 Wired Telecommunications Carriers 517312 Wireless Telecommunications Carriers (except Satellite) 517311 Wired Telecommunications Carriers	$20,817,419	0.5%	Rank history: not on the FY2022 list, #52 in FY2023, #18 in FY2024 and #12 in FY2025; down 4 since FY2020.
24	Martin Brothers Construction Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$20,244,632	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
25	Ldss, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$20,129,495	0.5%	Rank history: #21 in FY2022, #21 in FY2023, #21 in FY2024 and not on the FY2025 list; up 1 since FY2020.
26	Grunley Construction Co., Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction 238990 All Other Specialty Trade Contractors	$19,752,879	0.5%	Rank history: not on the FY2022–FY2025 lists; up 145 since FY2020.
27	Garco Construction, Inc. Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$19,654,822	0.5%	Rank history: #38 in FY2022, #42 in FY2023, #50 in FY2024 and #32 in FY2025; down 9 since FY2020.
28	Smartronix LLC Top NAICS codes 541519 Other Computer Related Services	$19,604,950	0.5%	Rank history: #29 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
29	Aero Spray Inc. Top NAICS codes 115310 Support Activities for Forestry 481212 Nonscheduled Chartered Freight Air Transportation	$18,689,052	0.4%	Rank history: not on the FY2022–FY2023 lists, #77 in FY2024 and #87 in FY2025; up 76 since FY2020.
30	The Walsh Group Through Archer Western Construction, LLC Top NAICS codes 237110 Water and Sewer Line and Related Structures Construction	$18,474,577	0.4%	Rank history: #7 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
31	The Aleut Corporation Through Aleut Construction LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 562910 Remediation Services	$18,278,969	0.4%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
32	Peter Kiewit Sons', Inc. Through Kiewit Infrastructure South Co Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$17,998,018	0.4%	Rank history: not on the FY2022–FY2024 lists and #2 in FY2025; new, not ranked in FY2020.
33	Chickasaw Defense Logistics, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$17,496,930	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top NAICS codes 541511 Custom Computer Programming Services 541519 Other Computer Related Services 541513 Computer Facilities Management Services	$17,378,016	0.4%	Rank history: #43 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; up 53 since FY2020.
35	Jacobs Government Services Company Top NAICS codes 541330 Engineering Services	$17,153,308	0.4%	Rank history: #66 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
36	L3Harris Technologies, Inc. 5 awardees, including L3 Technologies Inc., NV5 Geospatial Solutions, Inc. and Narda Holdings, Inc. Top NAICS codes 334220 Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing 811212 Computer and Office Machine Repair and Maintenance	$16,993,008	0.4%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
37	City of Marion Top NAICS codes 237110 Water and Sewer Line and Related Structures Construction	$16,405,188	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	DSL Builders LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 238990 All Other Specialty Trade Contractors 333318 Other Commercial and Service Industry Machinery Manufacturing	$15,949,765	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Krew Heavy Civil LLC Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$15,755,000	0.4%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; down 15 since FY2020.
40	Pacific TECH Construction Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$15,237,909	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
41	Arctic Information Technology, Inc. Top NAICS codes 541512 Computer Systems Design Services 334118 Computer Terminal and Other Computer Peripheral Equipment Manufacturing	$14,992,535	0.3%	Rank history: not on the FY2022 list, #80 in FY2023 and not on the FY2024–FY2025 lists; up 394 since FY2020.
42	Nexgen Technologies Inc. Top NAICS codes 541511 Custom Computer Programming Services 541620 Environmental Consulting Services	$14,606,549	0.3%	Rank history: #40 in FY2022, #51 in FY2023, #51 in FY2024 and #60 in FY2025; down 26 since FY2020.
43	Hdr, Inc. 7 awardees, including HDR Engineering, Inc. and HDR Schnabel Reclamation Joint Venture Top NAICS codes 541330 Engineering Services 541310 Architectural Services	$13,857,581	0.3%	Rank history: #18 in FY2022, #30 in FY2023, #35 in FY2024 and #74 in FY2025; up 13 since FY2020.
44	Rangel Construction Company LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 238110 Poured Concrete Foundation and Structure Contractors	$13,675,756	0.3%	Rank history: not on the FY2022–FY2025 lists; up 114 since FY2020.
45	Bairco Construction Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction 237110 Water and Sewer Line and Related Structures Construction 237120 Oil and Gas Pipeline and Related Structures Construction	$13,502,169	0.3%	Rank history: not on the FY2022–FY2023 lists, #88 in FY2024 and #55 in FY2025; up 58 since FY2020.
46	Vion Corporation Top NAICS codes 541519 Other Computer Related Services	$13,401,641	0.3%	Rank history: not on the FY2022–FY2025 lists; up 128 since FY2020.
47	The Dewberry Companies LC 2 awardees, including Dewberry Engineers Inc. and Dewberry Consultants LLC Top NAICS codes 541360 Geophysical Surveying and Mapping Services 541620 Environmental Consulting Services	$13,266,880	0.3%	Rank history: #37 in FY2022, #38 in FY2023 and not on the FY2024–FY2025 lists; down 18 since FY2020.
48	Planet Technologies, Inc. Top NAICS codes 541519 Other Computer Related Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$13,021,097	0.3%	Rank history: #17 in FY2022, #15 in FY2023, #12 in FY2024 and #14 in FY2025; up 54 since FY2020.
49	Valdez International Corporation Top NAICS codes 541513 Computer Facilities Management Services	$12,981,679	0.3%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
50	Booz Allen Hamilton Holding Corporation 2 awardees, including Booz Allen Hamilton Inc. Top NAICS codes 541330 Engineering Services 541511 Custom Computer Programming Services 541611 Administrative Management and General Management Consulting Services	$12,883,236	0.3%	Rank history: not on the FY2022 list, #87 in FY2023, #24 in FY2024 and not on the FY2025 list; up 3 since FY2020.
51	BCI Construction Usa, Inc. Top NAICS codes 333923 Overhead Traveling Crane, Hoist, and Monorail System Manufacturing 237990 Other Heavy and Civil Engineering Construction	$12,418,090	0.3%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; up 55 since FY2020.
52	Deloitte LLP 2 awardees, including Deloitte & Touche LLP and Deloitte Consulting LLP Top NAICS codes 541519 Other Computer Related Services 541611 Administrative Management and General Management Consulting Services	$12,275,751	0.3%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; up 73 since FY2020.
53	Woolpert, Inc. 2 awardees, including Geomatics Data Solutions, A Woolpert Company, LLC Top NAICS codes 541360 Geophysical Surveying and Mapping Services 541611 Administrative Management and General Management Consulting Services 541370 Surveying and Mapping (except Geophysical) Services	$12,076,772	0.3%	Rank history: #30 in FY2022, #79 in FY2023, #15 in FY2024 and #31 in FY2025; down 38 since FY2020.
54	Fiber Business Solutions Group Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction 561621 Security Systems Services (except Locksmiths) 238220 Plumbing, Heating, and Air-Conditioning Contractors	$12,052,691	0.3%	Rank history: not on the FY2022–FY2023 lists, #28 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
55	JMG Constructors LLC Top NAICS codes 237110 Water and Sewer Line and Related Structures Construction 237990 Other Heavy and Civil Engineering Construction 236220 Commercial and Institutional Building Construction	$11,877,777	0.3%	Rank history: #92 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; up 214 since FY2020.
56	Secunetics Inc. Top NAICS codes 541519 Other Computer Related Services	$11,792,120	0.3%	Rank history: not on the FY2022–FY2025 lists; up 58 since FY2020.
57	Cherokee Nation System Solutions LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 561422 Telemarketing Bureaus and Other Contact Centers	$11,741,401	0.3%	Rank history: #79 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
58	Tutor Perini Corporation 2 awardees Top NAICS codes 238290 Other Building Equipment Contractors 236220 Commercial and Institutional Building Construction	$11,462,047	0.3%	Rank history: #16 in FY2022, #11 in FY2023, #10 in FY2024 and not on the FY2025 list; down 47 since FY2020.
59	Applied Research Associates, Inc. Top NAICS codes 561210 Facilities Support Services 541990 All Other Professional, Scientific, and Technical Services	$11,288,382	0.3%	Rank history: not on the FY2022–FY2025 lists; up 88 since FY2020.
60	Andritz AG Through Andritz Hydro Corp Top NAICS codes 237990 Other Heavy and Civil Engineering Construction 238990 All Other Specialty Trade Contractors 333611 Turbine and Turbine Generator Set Units Manufacturing	$11,286,211	0.3%	Rank history: not on the FY2022 list, #17 in FY2023 and not on the FY2024–FY2025 lists; up 368 since FY2020.
61	Nippon Telegraph and Telephone Corporation 2 awardees, including NTT Data Federal Services, Inc. and Docomo Pacific, Inc. Top NAICS codes 541511 Custom Computer Programming Services 517312 Wireless Telecommunications Carriers (except Satellite)	$11,034,147	0.3%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; down 23 since FY2020.
62	Pipkin Inc. Top NAICS codes 237990 Other Heavy and Civil Engineering Construction 237310 Highway, Street, and Bridge Construction	$11,005,510	0.3%	Rank history: not on the FY2022–FY2023 lists, #44 in FY2024 and not on the FY2025 list; up 430 since FY2020.
63	Goldbelt, Incorporated 3 awardees, including Goldbelt Hawk L.L.C. and Goldbelt Glacier Health Services, LLC Top NAICS codes 541512 Computer Systems Design Services 561110 Office Administrative Services 541519 Other Computer Related Services	$10,998,976	0.3%	Rank history: not on the FY2022–FY2024 lists and #88 in FY2025; up 99 since FY2020.
64	Yellowstone Electric Co Top NAICS codes 237130 Power and Communication Line and Related Structures Construction	$10,919,489	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Environmental Systems Research Institute, Inc. Top NAICS codes 511210 Software Publishers 611430 Professional and Management Development Training 611420 Computer Training	$10,651,663	0.2%	Rank history: #74 in FY2022, not on the FY2023 list, #59 in FY2024 and #82 in FY2025; down 2 since FY2020.
66	Carahsoft Technology Corp Top NAICS codes 511210 Software Publishers 334111 Electronic Computer Manufacturing 541519 Other Computer Related Services	$10,498,391	0.2%	Rank history: #88 in FY2022, #75 in FY2023, #90 in FY2024 and not on the FY2025 list; down 32 since FY2020.
67	Otak, Inc. Top NAICS codes 541310 Architectural Services 541990 All Other Professional, Scientific, and Technical Services 541620 Environmental Consulting Services	$10,387,164	0.2%	Rank history: not on the FY2022 list, #71 in FY2023, #55 in FY2024 and not on the FY2025 list; up 88 since FY2020.
68	Doyon Government Contracting Inc. 2 awardees, including Doyon Management Services, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$10,285,196	0.2%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
69	V. F. Corporation Through VF Imagewear, Inc. Top NAICS codes 315210 Cut and Sew Apparel Contractors	$10,078,549	0.2%	Rank history: not on the FY2022–FY2025 lists; down 11 since FY2020.
70	Western Pilot Service Inc. Top NAICS codes 115310 Support Activities for Forestry	$9,961,512	0.2%	Rank history: not on the FY2022–FY2023 lists, #72 in FY2024 and #47 in FY2025; up 22 since FY2020.
71	Trace3 Government, LLC Top NAICS codes 541519 Other Computer Related Services 334111 Electronic Computer Manufacturing	$9,934,566	0.2%	Rank history: #58 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 34 since FY2020.
72	Hess Contracting LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$9,798,722	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Nationwide It Services Inc. Top NAICS codes 541512 Computer Systems Design Services	$9,715,323	0.2%	Rank history: #34 in FY2022, #46 in FY2023, #37 in FY2024 and #57 in FY2025; new, not ranked in FY2020.
74	Odin Environmental Solutions, LLC Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$9,660,300	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Bighorn Airways Inc. Top NAICS codes 481211 Nonscheduled Chartered Passenger Air Transportation	$9,651,026	0.2%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
76	PG&E Corporation Through Pacific Gas and Electric Company Top NAICS codes 237130 Power and Communication Line and Related Structures Construction 221122 Electric Power Distribution	$9,581,641	0.2%	Rank history: not on the FY2022–FY2025 lists; up 397 since FY2020.
77	Danaher Corporation 7 awardees, including OTT Hydromet Corp, Hach Company and Leica Microsystems Inc. Top NAICS codes 334513 Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables 334519 Other Measuring and Controlling Device Manufacturing 811219 Other Electronic and Precision Equipment Repair and Maintenance	$9,531,671	0.2%	Rank history: #90 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; up 110 since FY2020.
78	Nana Regional Corporation Inc 10 awardees, including Affigent, LLC, Dowl, LLC and TKC Global Solutions, LLC Top NAICS codes 541519 Other Computer Related Services 541330 Engineering Services 541512 Computer Systems Design Services	$9,511,009	0.2%	Rank history: #68 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; down 36 since FY2020.
79	Cook Inlet Region Inc. 5 awardees, including North Wind Construction Services, LLC, North Wind Resource Consulting LLC and North Wind Site Services LLC Top NAICS codes 562910 Remediation Services 237990 Other Heavy and Civil Engineering Construction 541620 Environmental Consulting Services	$9,351,300	0.2%	Rank history: not on the FY2022–FY2023 lists, #94 in FY2024 and not on the FY2025 list; down 49 since FY2020.
80	Sierra7, Inc. Top NAICS codes 541512 Computer Systems Design Services	$9,300,000	0.2%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
81	Weil Construction Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$8,988,376	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Stone & Lime Imports, Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction 238190 Other Foundation, Structure, and Building Exterior Contractors	$8,976,961	0.2%	Rank history: #41 in FY2022, #25 in FY2023, not on the FY2024 list and #29 in FY2025; down 37 since FY2020.
83	K2 Contracting Group, LLC 2 awardees Top NAICS codes 236220 Commercial and Institutional Building Construction 236210 Industrial Building Construction 237130 Power and Communication Line and Related Structures Construction	$8,888,496	0.2%	Rank history: not on the FY2022–FY2025 lists; up 260 since FY2020.
84	Gardner Zemke Co Top NAICS codes 237130 Power and Communication Line and Related Structures Construction	$8,878,531	0.2%	Rank history: not on the FY2022–FY2025 lists; down 34 since FY2020.
85	National Contracting Services, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 237990 Other Heavy and Civil Engineering Construction 238990 All Other Specialty Trade Contractors	$8,761,579	0.2%	Rank history: not on the FY2022–FY2025 lists; up 360 since FY2020.
86	Environmental Management & Planning Solutions LLC 2 awardees Top NAICS codes 541620 Environmental Consulting Services 541370 Surveying and Mapping (except Geophysical) Services 541690 Other Scientific and Technical Consulting Services	$8,724,792	0.2%	Rank history: #49 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; down 38 since FY2020.
87	Vanasse Hangen Brustlin, Inc. 2 awardees Top NAICS codes 541330 Engineering Services 541620 Environmental Consulting Services 541310 Architectural Services	$8,704,283	0.2%	Rank history: not on the FY2022 list, #99 in FY2023 and not on the FY2024–FY2025 lists; up 306 since FY2020.
88	Flatwater, Incorporated Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$8,619,207	0.2%	Rank history: not on the FY2022–FY2025 lists; down 19 since FY2020.
89	Snf, Inc. Top NAICS codes 336992 Military Armored Vehicle, Tank, and Tank Component Manufacturing 336211 Motor Vehicle Body Manufacturing	$8,550,443	0.2%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; up 26 since FY2020.
90	Ausland Builders Inc. Top NAICS codes 236220 Commercial and Institutional Building Construction	$8,453,044	0.2%	Rank history: not on the FY2022–FY2025 lists; down 30 since FY2020.
91	AE West LLC Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$8,425,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Classic Site Solutions Inc. Top NAICS codes 237310 Highway, Street, and Bridge Construction 236220 Commercial and Institutional Building Construction 237110 Water and Sewer Line and Related Structures Construction	$8,264,638	0.2%	Rank history: #50 in FY2022, #43 in FY2023, #98 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
93	Aaecon General Contracting LLC Top NAICS codes 237990 Other Heavy and Civil Engineering Construction 236220 Commercial and Institutional Building Construction 237310 Highway, Street, and Bridge Construction	$8,264,149	0.2%	Rank history: not on the FY2022–FY2025 lists; up 59 since FY2020.
94	Alaska Power & Telephone Company 2 awardees, including Alaska Telephone Company Top NAICS codes 541330 Engineering Services 517911 Telecommunications Resellers	$8,160,982	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Science Applications International Corporation 2 awardees Top NAICS codes 541519 Other Computer Related Services 541512 Computer Systems Design Services	$8,140,720	0.2%	Rank history: #35 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
96	Commdex, LLC Top NAICS codes 334220 Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing 541690 Other Scientific and Technical Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$8,109,289	0.2%	Rank history: #82 in FY2022 and not on the FY2023–FY2025 lists; up 27 since FY2020.
97	WSP USA Solutions Inc. Top NAICS codes 541330 Engineering Services 541620 Environmental Consulting Services	$7,981,411	0.2%	Rank history: not on the FY2022–FY2025 lists; up 256 since FY2020.
98	Ahtna, Incorporated 2 awardees, including Ahtna Global LLC and Ahtna Design-Build Inc. Top NAICS codes 237990 Other Heavy and Civil Engineering Construction 236220 Commercial and Institutional Building Construction 238910 Site Preparation Contractors	$7,914,748	0.2%	Rank history: not on the FY2022–FY2025 lists; up 159 since FY2020.
99	Mythics, LLC 2 awardees, including Emergent, LLC Top NAICS codes 541519 Other Computer Related Services 334111 Electronic Computer Manufacturing 511210 Software Publishers	$7,899,892	0.2%	Rank history: not on the FY2022–FY2025 lists; down 48 since FY2020.
100	Fugro Geospatial Inc. 4 awardees, including Fugro USA Land, Inc. and Fugro USA Marine, Inc. Top NAICS codes 541360 Geophysical Surveying and Mapping Services 541620 Environmental Consulting Services	$7,821,787	0.2%	Rank history: #71 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in 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 $4.35 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.

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