Top 100 DOD Washington Headquarters Service Contractors, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	National Security Technology Accelerator Inc.	$343,554,250	26.0%	Rank history: #1 in FY2022, #1 in FY2023, #2 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$124,771,670	9.4%	Rank history: #2 in FY2022, #2 in FY2023, #1 in FY2024 and #3 in FY2025; up 8 since FY2020.
3	Analytic Services Inc. 2 awardees, including Advanced Technology International Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$27,934,165	2.1%	Rank history: #5 in FY2022, #20 in FY2023, not on the FY2024 list and #84 in FY2025; up 114 since FY2020.
4	Servicesource Inc. Top NAICS codes 561210 Facilities Support Services	$25,069,145	1.9%	Rank history: #6 in FY2022, #12 in FY2023, #8 in FY2024 and #10 in FY2025; up 7 since FY2020.
5	Puyenpa Services, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$24,499,138	1.9%	Rank history: not on the FY2022 list, #59 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
6	Diversified Protection Corp Top NAICS codes 561612 Security Guards and Patrol Services	$20,980,360	1.6%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
7	Two Six Labs Holdings, Inc. Through Two Six Labs, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$20,086,072	1.5%	Rank history: not on the FY2022 list, #42 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
8	M.c. Dean, Inc. Top NAICS codes 561621 Security Systems Services (except Locksmiths) 811310 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance 423610 Electrical Apparatus and Equipment, Wiring Supplies, and Related Equipment Merchant Wholesalers	$18,625,542	1.4%	Rank history: #43 in FY2022, #61 in FY2023, #46 in FY2024 and #47 in FY2025; up 1 since FY2020.
9	The Boeing Company 2 awardees Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$17,764,531	1.3%	Rank history: #16 in FY2022, not on the FY2023 list, #93 in FY2024 and not on the FY2025 list; up 244 since FY2020.
10	Lockheed Martin Corporation 3 awardees Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 561990 All Other Support Services	$16,654,747	1.3%	Rank history: #3 in FY2022, #29 in FY2023, #27 in FY2024 and #23 in FY2025; up 223 since FY2020.
11	On Assignment, Inc. Through ECS Federal, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$16,250,000	1.2%	Rank history: not on the FY2022–FY2025 lists; up 298 since FY2020.
12	RTX Corporation 5 awardees, including Raytheon Company Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing 811213 Communication Equipment Repair and Maintenance	$16,223,391	1.2%	Rank history: #14 in FY2022, #21 in FY2023 and not on the FY2024–FY2025 lists; up 25 since FY2020.
13	Bering Straits Native Corporation 2 awardees, including Stampede Ventures Inc. Top NAICS codes 237310 Highway, Street, and Bridge Construction 236220 Commercial and Institutional Building Construction	$15,897,339	1.2%	Rank history: #26 in FY2022, not on the FY2023–FY2024 lists and #35 in FY2025; new, not ranked in FY2020.
14	Maximus Federal Technology Solutions, LLC Top NAICS codes 541511 Custom Computer Programming Services	$15,888,864	1.2%	Rank history: not on the FY2022–FY2023 lists, #66 in FY2024 and not on the FY2025 list; up 28 since FY2020.
15	Massachusetts Institute of Technology Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$14,211,855	1.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
16	Nakupuna Solutions, LLC Top NAICS codes 541519 Other Computer Related Services 541512 Computer Systems Design Services 561210 Facilities Support Services	$13,972,478	1.1%	Rank history: #13 in FY2022, #37 in FY2023, #78 in FY2024 and not on the FY2025 list; up 7 since FY2020.
17	SNA International LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$13,529,164	1.0%	Rank history: #19 in FY2022, #23 in FY2023, not on the FY2024 list and #20 in FY2025; up 9 since FY2020.
18	Johnson Controls Security Solutions LLC 3 awardees, including Johnson Controls Building Automation Systems, LLC and Johnson Controls Fire Protection LP Top NAICS codes 541512 Computer Systems Design Services 238220 Plumbing, Heating, and Air-Conditioning Contractors	$13,212,059	1.0%	Rank history: #8 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
19	Didlake Inc. Top NAICS codes 561720 Janitorial Services	$13,089,877	1.0%	Rank history: #7 in FY2022, not on the FY2023 list, #36 in FY2024 and #32 in FY2025; up 12 since FY2020.
20	Radiance Technologies Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$11,200,472	0.8%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
21	Chimes District of Columbia Inc. Top NAICS codes 561720 Janitorial Services	$10,150,037	0.8%	Rank history: #10 in FY2022, not on the FY2023 list, #55 in FY2024 and not on the FY2025 list; up 20 since FY2020.
22	Markon LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$9,982,124	0.8%	Rank history: #28 in FY2022, #27 in FY2023 and not on the FY2024–FY2025 lists; up 16 since FY2020.
23	Pro-Sphere Tek, Inc. Top NAICS codes 541512 Computer Systems Design Services	$9,935,771	0.8%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
24	Georgia TECH Research Corp Through Georgia TECH Applied Research Corp Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$9,620,123	0.7%	Rank history: #21 in FY2022, #6 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
25	Qualx, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$9,417,642	0.7%	Rank history: #11 in FY2022, #14 in FY2023, #28 in FY2024 and #11 in FY2025; up 4 since FY2020.
26	Qcm, Inc. Top NAICS codes 238220 Plumbing, Heating, and Air-Conditioning Contractors	$9,056,962	0.7%	Rank history: #30 in FY2022, #31 in FY2023, #22 in FY2024 and #43 in FY2025; up 10 since FY2020.
27	Morsecorp, Inc. Top NAICS codes 541330 Engineering Services	$9,038,737	0.7%	Rank history: not on the FY2022 list, #94 in FY2023, #91 in FY2024 and not on the FY2025 list; up 416 since FY2020.
28	Global Infotek Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$9,015,777	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	The CNA Corporation Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$8,787,000	0.7%	Rank history: #31 in FY2022, #22 in FY2023, #38 in FY2024 and #37 in FY2025; up 20 since FY2020.
30	Novetta Solutions, LLC Through Accenture Federal Services LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$8,141,454	0.6%	Rank history: not on the FY2022 list, #40 in FY2023 and not on the FY2024–FY2025 lists; up 144 since FY2020.
31	TM3 Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services 541512 Computer Systems Design Services	$7,877,914	0.6%	Rank history: #20 in FY2022 and not on the FY2023–FY2025 lists; up 435 since FY2020.
32	Guidehouse Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$7,847,403	0.6%	Rank history: #27 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
33	Alaska Native Government Services LLC Through Copper River Technologies, LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 541330 Engineering Services	$7,580,980	0.6%	Rank history: #24 in FY2022, #15 in FY2023, #40 in FY2024 and #61 in FY2025; up 25 since FY2020.
34	Blackhorse, A Parsons LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$7,200,672	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Chinook Systems Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$6,812,730	0.5%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; up 22 since FY2020.
36	Innovasystems International LLC Top NAICS codes 541330 Engineering Services	$6,631,916	0.5%	Rank history: #58 in FY2022, #28 in FY2023, #16 in FY2024 and #71 in FY2025; up 19 since FY2020.
37	Riverside Research Institute 2 awardees, including Applied Research Solutions, Inc. Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$6,327,549	0.5%	Rank history: #18 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; up 285 since FY2020.
38	Whitney Bradley & Brown, Inc. Through Serco Inc. Top NAICS codes 541330 Engineering Services	$6,089,770	0.5%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
39	Jasint Consulting and Technologies, LLC Top NAICS codes 541512 Computer Systems Design Services 812930 Parking Lots and Garages 541612 Human Resources Consulting Services	$6,019,255	0.5%	Rank history: #40 in FY2022, #46 in FY2023, not on the FY2024 list and #68 in FY2025; up 72 since FY2020.
40	L3Harris Technologies, Inc. 4 awardees, including Leidos Security Detection & Automation, Inc. Top NAICS codes 541512 Computer Systems Design Services 334220 Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing	$5,822,877	0.4%	Rank history: not on the FY2022 list, #99 in FY2023, #4 in FY2024 and not on the FY2025 list; up 14 since FY2020.
41	Applied Environmental, Inc. Top NAICS codes 541620 Environmental Consulting Services	$5,742,930	0.4%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; up 68 since FY2020.
42	Weibel Equipment, Inc. Top NAICS codes 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing	$5,631,902	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Chesapeake Technology International, Corp. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$5,308,569	0.4%	Rank history: #22 in FY2022 and not on the FY2023–FY2025 lists; down 16 since FY2020.
44	Science Applications International Corporation Top NAICS codes 541330 Engineering Services 541611 Administrative Management and General Management Consulting Services	$5,272,410	0.4%	Rank history: not on the FY2022–FY2025 lists; down 11 since FY2020.
45	GXM Technologies LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$4,999,673	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	R & R Janitorial, Painting & Building Services Inc. Top NAICS codes 561720 Janitorial Services	$4,762,311	0.4%	Rank history: #36 in FY2022, #55 in FY2023, #81 in FY2024 and #75 in FY2025; up 17 since FY2020.
47	Galapagos Federal Systems LLC Top NAICS codes 541512 Computer Systems Design Services	$4,720,012	0.4%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 57 since FY2020.
48	Logistics Management Institute 2 awardees, including The Tauri Group, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$4,603,178	0.3%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
49	Hdr, Inc. Through HDR Architecture, Inc. Top NAICS codes 541330 Engineering Services	$4,543,784	0.3%	Rank history: #29 in FY2022, #34 in FY2023, #69 in FY2024 and #57 in FY2025; down 5 since FY2020.
50	Deloitte LLP Through Deloitte Consulting LLP Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541511 Custom Computer Programming Services	$4,488,798	0.3%	Rank history: #71 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 33 since FY2020.
51	Prime Response, Inc. Top NAICS codes 561210 Facilities Support Services	$4,478,408	0.3%	Rank history: #62 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; up 169 since FY2020.
52	CCI General Contractors LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$4,389,612	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Northern Vietnam Helicopter Co. Ltd. Top NAICS codes 481211 Nonscheduled Chartered Passenger Air Transportation	$4,280,765	0.3%	Rank history: not on the FY2022–FY2025 lists; up 20 since FY2020.
54	BAE Systems Land & Armaments L.P. 2 awardees, including BAE Systems Technology Solutions & Services Inc. and BAE Systems Information & Electronic Systems Integration Inc. Top NAICS codes 541330 Engineering Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$4,123,580	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Jensen Hughes, Inc. Top NAICS codes 541330 Engineering Services	$3,997,799	0.3%	Rank history: #52 in FY2022, #54 in FY2023, #80 in FY2024 and #72 in FY2025; up 12 since FY2020.
56	Mriglobal Top NAICS codes 541380 Testing Laboratories and Services	$3,981,611	0.3%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
57	Honeywell International Inc. Top NAICS codes 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing	$3,972,873	0.3%	Rank history: #17 in FY2022, #5 in FY2023, #5 in FY2024 and #52 in FY2025; down 35 since FY2020.
58	The Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$3,915,959	0.3%	Rank history: not on the FY2022 list, #82 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
59	Procurement & Acquisition Center of Excellence, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 611430 Professional and Management Development Training	$3,877,015	0.3%	Rank history: #37 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; up 44 since FY2020.
60	Bechtel Corp Through National Aerospace Solutions, LLC Top NAICS codes 541330 Engineering Services	$3,876,909	0.3%	Rank history: #82 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
61	Kpmg L.L.P. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$3,441,353	0.3%	Rank history: #51 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; up 36 since FY2020.
62	Ati-Endyna JV, LLC Top NAICS codes 541620 Environmental Consulting Services	$3,213,595	0.2%	Rank history: #61 in FY2022, #69 in FY2023, #87 in FY2024 and not on the FY2025 list; up 18 since FY2020.
63	Frontier Technology Inc. Top NAICS codes 541511 Custom Computer Programming Services	$3,208,983	0.2%	Rank history: not on the FY2022–FY2025 lists; down 39 since FY2020.
64	Leidos Holdings, Inc. 5 awardees, including Leidos, Inc. and QTC Medical Services Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541330 Engineering Services	$3,195,408	0.2%	Rank history: #81 in FY2022, #88 in FY2023, not on the FY2024 list and #80 in FY2025; up 12 since FY2020.
65	The Craddock Group, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$3,190,168	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Redhorse Corporation Top NAICS codes 611430 Professional and Management Development Training 541512 Computer Systems Design Services	$3,186,218	0.2%	Rank history: #76 in FY2022, not on the FY2023 list, #98 in FY2024 and not on the FY2025 list; down 20 since FY2020.
67	Concept Plus, LLC Top NAICS codes 541512 Computer Systems Design Services	$2,976,803	0.2%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; up 25 since FY2020.
68	NA Alii Consulting & Sales LLC Top NAICS codes 561210 Facilities Support Services 541512 Computer Systems Design Services	$2,973,796	0.2%	Rank history: not on the FY2022–FY2025 lists; down 25 since FY2020.
69	Imec Group, LLC Top NAICS codes 236220 Commercial and Institutional Building Construction 238220 Plumbing, Heating, and Air-Conditioning Contractors	$2,959,381	0.2%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; up 110 since FY2020.
70	R2 Space, LLC	$2,900,000	0.2%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
71	Chronos Systems Inc. Top NAICS codes 541519 Other Computer Related Services	$2,872,000	0.2%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
72	Sinew Management Group LLC Top NAICS codes 811212 Computer and Office Machine Repair and Maintenance	$2,835,896	0.2%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
73	EMCOR Group, Inc. Through Emcor Government Services, Inc. Top NAICS codes 238220 Plumbing, Heating, and Air-Conditioning Contractors	$2,766,632	0.2%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
74	Analog Photonics LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,737,388	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Securboration, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,699,870	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Kenney Business Solutions Inc. Top NAICS codes 561410 Document Preparation Services	$2,691,668	0.2%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
77	Ax Enterprize, LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$2,296,641	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Shoulder 2 Shoulder Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$2,238,013	0.2%	Rank history: not on the FY2022–FY2023 lists, #84 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
79	HII Mission Technologies Corp Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$2,206,666	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Bluehalo, LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541711 Research and Development in Biotechnology 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,170,338	0.2%	Rank history: not on the FY2022–FY2025 lists; up 59 since FY2020.
81	Teledyne Technologies Incorporated Through Teledyne Scientific & Imaging, LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$2,149,292	0.2%	Rank history: not on the FY2022 list, #58 in FY2023 and not on the FY2024–FY2025 lists; up 31 since FY2020.
82	Tlingit Haida Tribal Business Corporation Through Kira Aviation Services LLC Top NAICS codes 561210 Facilities Support Services	$2,052,204	0.2%	Rank history: #69 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
83	The Pennsylvania State University Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,044,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Gryphon Scientific, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$2,043,749	0.2%	Rank history: not on the FY2022–FY2025 lists; up 39 since FY2020.
85	George Mason University Top NAICS codes 611310 Colleges, Universities, and Professional Schools	$2,030,543	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Capital Brand Group LLC Top NAICS codes 561210 Facilities Support Services 238220 Plumbing, Heating, and Air-Conditioning Contractors 236220 Commercial and Institutional Building Construction	$2,002,198	0.2%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; down 24 since FY2020.
87	Noted Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,000,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Transphorm, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,000,000	0.2%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
89	Telemus Group LLC Top NAICS codes 541720 Research and Development in the Social Sciences and Humanities 541611 Administrative Management and General Management Consulting Services	$1,975,437	0.1%	Rank history: not on the FY2022 list, #89 in FY2023 and not on the FY2024–FY2025 lists; up 73 since FY2020.
90	Zero Waste Solutions, Inc. Top NAICS codes 561210 Facilities Support Services	$1,960,325	0.1%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
91	Serco Inc. Top NAICS codes 541330 Engineering Services	$1,915,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	R & K Solutions, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,914,496	0.1%	Rank history: not on the FY2022 list, #85 in FY2023 and not on the FY2024–FY2025 lists; up 53 since FY2020.
93	Gentech Associates Inc. Top NAICS codes 541219 Other Accounting Services 541611 Administrative Management and General Management Consulting Services	$1,891,929	0.1%	Rank history: not on the FY2022–FY2025 lists; up 71 since FY2020.
94	Cherokee Nation Environmental Solutions, L.L.C. Top NAICS codes 238340 Tile and Terrazzo Contractors 236220 Commercial and Institutional Building Construction 237130 Power and Communication Line and Related Structures Construction	$1,888,284	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Fibertek, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,882,000	0.1%	Rank history: not on the FY2022–FY2023 lists, #92 in FY2024 and not on the FY2025 list; down 1 since FY2020.
96	Definitive Logic Corporation Top NAICS codes 541519 Other Computer Related Services	$1,879,862	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	A2 Systems Engineering, Inc. Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$1,875,065	0.1%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
98	Avantus Federal LLC Top NAICS codes 541219 Other Accounting Services	$1,833,021	0.1%	Rank history: not on the FY2022–FY2025 lists; up 23 since FY2020.
99	Information Systems Laboratories Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,780,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 135 since FY2020.
100	Ashland Industrial Services, LLC Through A&E Elevator, LLC Top NAICS codes 238290 Other Building Equipment Contractors	$1,762,248	0.1%	Rank history: #72 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; up 10 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 $1.32 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