Top 100 Defense Threat Reduction Agency Contractors, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	CACI International Inc. 3 awardees, including Caci Nss, LLC, Caci, Inc. - Federal and Charon Technologies LLC Top NAICS codes 541330 Engineering Services 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541990 All Other Professional, Scientific, and Technical Services	$180,775,429	14.2%	Rank history: #1 in FY2022, #3 in FY2023, #4 in FY2024 and #5 in FY2025; unchanged since FY2020.
2	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top NAICS codes 541512 Computer Systems Design Services 541990 All Other Professional, Scientific, and Technical Services	$126,021,394	9.9%	Rank history: #4 in FY2022, #5 in FY2023, #3 in FY2024 and #3 in FY2025; unchanged since FY2020.
3	Applied Research Associates, Inc. 2 awardees, including Neya Systems LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541990 All Other Professional, Scientific, and Technical Services 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$120,906,466	9.5%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
4	Leidos Holdings, Inc. 4 awardees, including Leidos, Inc. Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541512 Computer Systems Design Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$58,909,503	4.6%	Rank history: #8 in FY2022, #6 in FY2023, #6 in FY2024 and #2 in FY2025; unchanged since FY2020.
5	Black & Veatch Special Projects Corp. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$54,123,018	4.3%	Rank history: #20 in FY2022, #12 in FY2023, #24 in FY2024 and #30 in FY2025; up 6 since FY2020.
6	Teksynap Corporation Top NAICS codes 541513 Computer Facilities Management Services 541519 Other Computer Related Services	$36,135,825	2.8%	Rank history: #7 in FY2022, #7 in FY2023, #8 in FY2024 and #13 in FY2025; up 4 since FY2020.
7	Science Applications International Corporation Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541990 All Other Professional, Scientific, and Technical Services 541614 Process, Physical Distribution, and Logistics Consulting Services	$34,763,678	2.7%	Rank history: #24 in FY2022, #27 in FY2023, #28 in FY2024 and #18 in FY2025; down 2 since FY2020.
8	Amentum Services, Inc. Through URS Federal Services International, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$34,722,801	2.7%	Rank history: #6 in FY2022, #4 in FY2023, #13 in FY2024 and not on the FY2025 list; up 12 since FY2020.
9	L3Harris Technologies, Inc. 2 awardees, including Fisica Applied Technologies, Inc. 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)	$27,141,990	2.1%	Rank history: #14 in FY2022, #21 in FY2023, #22 in FY2024 and #17 in FY2025; up 23 since FY2020.
10	PAE Government Services Inc. 2 awardees, including PAE National Security Solutions LLC and Centra Technology, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$25,856,656	2.0%	Rank history: #13 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
11	Amyx Inc. Top NAICS codes 541330 Engineering Services	$24,442,327	1.9%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
12	Southwest Research Institute Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$22,285,147	1.8%	Rank history: #15 in FY2022, #17 in FY2023, #15 in FY2024 and #16 in FY2025; up 4 since FY2020.
13	Nova Global Supply and Services LLC Through Valiant Global Defense Services Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 921190 Other General Government Support	$20,340,742	1.6%	Rank history: #19 in FY2022, #18 in FY2023, #49 in FY2024 and not on the FY2025 list; up 1 since FY2020.
14	Jacobs Engineering Group Inc. 4 awardees, including Ch2M Hill, Inc. and The Keyw Corporation Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 811213 Communication Equipment Repair and Maintenance	$19,964,982	1.6%	Rank history: #66 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
15	General Dynamics Corporation 3 awardees, including General Dynamics Information Technology, Inc., General Dynamics Mission Systems, Inc. and General Dynamics One Source LLC Top NAICS codes 541512 Computer Systems Design Services 541990 All Other Professional, Scientific, and Technical Services 334111 Electronic Computer Manufacturing	$14,821,262	1.2%	Rank history: #18 in FY2022, #19 in FY2023, #12 in FY2024 and #7 in FY2025; up 7 since FY2020.
16	International Aids Vaccine Initiative Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$14,713,184	1.2%	Rank history: #32 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
17	Arservices, Limited Top NAICS codes 541330 Engineering Services 541990 All Other Professional, Scientific, and Technical Services 493110 General Warehousing and Storage	$13,276,507	1.0%	Rank history: #12 in FY2022, #16 in FY2023, #16 in FY2024 and #12 in FY2025; up 65 since FY2020.
18	Savantage Financial Services, Inc. Top NAICS codes 541519 Other Computer Related Services	$10,716,785	0.8%	Rank history: #21 in FY2022, #22 in FY2023, #20 in FY2024 and #19 in FY2025; new, not ranked in FY2020.
19	Premier Technology, Inc. Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$10,627,784	0.8%	Rank history: #29 in FY2022, #24 in FY2023, #23 in FY2024 and #26 in FY2025; up 9 since FY2020.
20	Noblis, Inc. Top NAICS codes 541330 Engineering Services	$9,610,269	0.8%	Rank history: #5 in FY2022, #13 in FY2023, #7 in FY2024 and #6 in FY2025; new, not ranked in FY2020.
21	Systems Planning and Analysis, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$9,569,892	0.8%	Rank history: #10 in FY2022, #11 in FY2023, #14 in FY2024 and #9 in FY2025; new, not ranked in FY2020.
22	Culmen International, LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$9,071,795	0.7%	Rank history: #17 in FY2022, #10 in FY2023, #21 in FY2024 and #20 in FY2025; down 14 since FY2020.
23	RTX Corporation 2 awardees, including Raytheon Company and RTX BBN Technologies, Inc. Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541990 All Other Professional, Scientific, and Technical Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$8,966,933	0.7%	Rank history: #26 in FY2022, #37 in FY2023, #18 in FY2024 and #45 in FY2025; up 39 since FY2020.
24	X Corp Solutions Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$8,254,375	0.6%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
25	Parsons Corporation 3 awardees, including Parsons Government Services International Inc. and Ogsystems, LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$7,981,547	0.6%	Rank history: #16 in FY2022, #9 in FY2023, #9 in FY2024 and #11 in FY2025; down 8 since FY2020.
26	Northrop Grumman Corporation 4 awardees, including Northrop Grumman Systems Corporation Top NAICS codes 541512 Computer Systems Design Services 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541511 Custom Computer Programming Services	$7,489,038	0.6%	Rank history: #82 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
27	Axseum, Inc. Top NAICS codes 541512 Computer Systems Design Services	$7,132,628	0.6%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
28	HP Enterprise Services LLC 2 awardees, including Peraton Inc. Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541990 All Other Professional, Scientific, and Technical Services	$6,980,702	0.5%	Rank history: #23 in FY2022, #41 in FY2023, #92 in FY2024 and #92 in FY2025; up 7 since FY2020.
29	Huntington Ingalls Industries, Inc. Through HII Mission Technologies Corp Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$6,943,522	0.5%	Rank history: #41 in FY2022, not on the FY2023 list, #40 in FY2024 and #37 in FY2025; down 20 since FY2020.
30	Koninklijke Philips N.V. Through Philips North America LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$6,690,147	0.5%	Rank history: #42 in FY2022, #46 in FY2023, #73 in FY2024 and not on the FY2025 list; down 12 since FY2020.
31	ZEL Technologies LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$6,325,789	0.5%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
32	K2 Group, Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$6,065,749	0.5%	Rank history: #27 in FY2022, not on the FY2023 list, #31 in FY2024 and #29 in FY2025; up 11 since FY2020.
33	National Strategic Research Institute Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$5,772,548	0.5%	Rank history: #31 in FY2022, #26 in FY2023, #50 in FY2024 and #61 in FY2025; down 4 since FY2020.
34	Kbr, Inc. Through KBR Wyle Services, LLC Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$5,505,608	0.4%	Rank history: #56 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
35	Cherokee Nation Through Cherokee Nation Strategic Programs, L.L.C. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541611 Administrative Management and General Management Consulting Services	$5,461,968	0.4%	Rank history: #22 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
36	University of Oxford Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$5,239,911	0.4%	Rank history: not on the FY2022 list, #95 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
37	Microsoft Corporation Top NAICS codes 541512 Computer Systems Design Services	$4,897,383	0.4%	Rank history: #38 in FY2022, not on the FY2023 list, #75 in FY2024 and #55 in FY2025; up 5 since FY2020.
38	General Electric Company 3 awardees, including Reuter-Stokes, LLC Top NAICS codes 511110 Newspaper Publishers 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 334519 Other Measuring and Controlling Device Manufacturing	$4,868,262	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Dell Federal Systems L.P. 2 awardees, including Dell Marketing L.P. Top NAICS codes 541519 Other Computer Related Services 334111 Electronic Computer Manufacturing 511210 Software Publishers	$4,818,446	0.4%	Rank history: #33 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; up 177 since FY2020.
40	Metgreen Solutions Inc. Top NAICS codes 541519 Other Computer Related Services	$4,493,141	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
41	The Charles Stark Draper Laboratory, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541511 Custom Computer Programming Services 541512 Computer Systems Design Services	$4,406,775	0.3%	Rank history: #35 in FY2022, #52 in FY2023, #81 in FY2024 and not on the FY2025 list; up 7 since FY2020.
42	Pate Construction Co., Inc. Top NAICS codes 237990 Other Heavy and Civil Engineering Construction	$4,255,221	0.3%	Rank history: not on the FY2022 list, #82 in FY2023, #30 in FY2024 and not on the FY2025 list; up 14 since FY2020.
43	CDW Corporation Through CDW Government LLC Top NAICS codes 334111 Electronic Computer Manufacturing	$4,177,199	0.3%	Rank history: #45 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
44	Chimera Enterprises International Incorporated Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$4,051,743	0.3%	Rank history: #37 in FY2022, #45 in FY2023, #51 in FY2024 and not on the FY2025 list; down 5 since FY2020.
45	Sealing Technologies, LLC Top NAICS codes 541519 Other Computer Related Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$3,799,631	0.3%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
46	Centra Technology, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$3,779,026	0.3%	Rank history: not on the FY2022–FY2025 lists; down 19 since FY2020.
47	University of Alaska System Through University of Alaska Fairbanks Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$3,745,689	0.3%	Rank history: #34 in FY2022, #30 in FY2023, #38 in FY2024 and not on the FY2025 list; up 2 since FY2020.
48	Mantech International Corporation Through Mantech Mgs, Inc. Top NAICS codes 541219 Other Accounting Services	$3,631,654	0.3%	Rank history: #40 in FY2022, #64 in FY2023, #96 in FY2024 and not on the FY2025 list; down 24 since FY2020.
49	Vae, Inc. Top NAICS codes 541519 Other Computer Related Services 511210 Software Publishers	$3,597,229	0.3%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
50	Ministry of Defence Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology) 541711 Research and Development in Biotechnology	$3,398,403	0.3%	Rank history: not on the FY2022–FY2023 lists, #46 in FY2024 and not on the FY2025 list; up 138 since FY2020.
51	JFL Consulting, LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$3,331,704	0.3%	Rank history: #30 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
52	Chenega It Enterprise Services, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$3,210,835	0.3%	Rank history: #43 in FY2022, #58 in FY2023, #37 in FY2024 and not on the FY2025 list; up 14 since FY2020.
53	Broadleaf, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$3,043,872	0.2%	Rank history: #44 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
54	Alion Science and Technology Corporation 2 awardees, including HII Mission Technologies Corp Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 511210 Software Publishers	$3,000,024	0.2%	Rank history: not on the FY2022 list, #44 in FY2023, #88 in FY2024 and not on the FY2025 list; down 16 since FY2020.
55	Environmental Systems Research Institute, Inc. Top NAICS codes 511210 Software Publishers	$2,980,262	0.2%	Rank history: #49 in FY2022, #60 in FY2023, #58 in FY2024 and #44 in FY2025; unchanged since FY2020.
56	Venatorx Pharmaceuticals Inc. Top NAICS codes 541711 Research and Development in Biotechnology	$2,964,193	0.2%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
57	World Wide Technology Holding Co. Inc. Through Asynchrony Solutions, LLC Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$2,790,933	0.2%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
58	Natsionalny Yaderny Tsentr Respubliki Kazakhstan, GP Top NAICS codes 541330 Engineering Services	$2,673,781	0.2%	Rank history: #47 in FY2022, #43 in FY2023, #29 in FY2024 and not on the FY2025 list; up 9 since FY2020.
59	Indesign LLC Top NAICS codes 541330 Engineering Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,551,587	0.2%	Rank history: #63 in FY2022, #61 in FY2023, #74 in FY2024 and #67 in FY2025; up 45 since FY2020.
60	Sterling Computers Corporation Top NAICS codes 334210 Telephone Apparatus Manufacturing 541519 Other Computer Related Services 334111 Electronic Computer Manufacturing	$2,493,650	0.2%	Rank history: not on the FY2022–FY2025 lists; down 29 since FY2020.
61	Akima Data Management LLC Top NAICS codes 541618 Other Management Consulting Services	$2,474,673	0.2%	Rank history: #28 in FY2022, #28 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
62	Nevada State Veterans Home Through Board of Regents of Nevada System of Higher Education Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology) 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,465,495	0.2%	Rank history: #87 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
63	Nana Regional Corporation Inc 3 awardees, including Affigent, LLC, Tuvli LLC and Tuva LLC Top NAICS codes 541519 Other Computer Related Services 541690 Other Scientific and Technical Consulting Services 541611 Administrative Management and General Management Consulting Services	$2,370,919	0.2%	Rank history: #83 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 25 since FY2020.
64	C3.Ai, Inc.	$2,250,000	0.2%	Rank history: #51 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
65	Fortem Technologies Inc.	$2,222,819	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Novetta Solutions, LLC Through Accenture Federal Services LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,206,465	0.2%	Rank history: #55 in FY2022, #54 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
67	Kyrus Tech, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,184,928	0.2%	Rank history: #68 in FY2022, #57 in FY2023, #33 in FY2024 and #27 in FY2025; up 20 since FY2020.
68	Synergene Therapeutics Inc. Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$2,151,241	0.2%	Rank history: not on the FY2022 list, #91 in FY2023 and not on the FY2024–FY2025 lists; up 42 since FY2020.
69	Cisco Systems Inc. Top NAICS codes 511210 Software Publishers	$2,146,957	0.2%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
70	SBG Technology Solutions Inc. Top NAICS codes 541512 Computer Systems Design Services	$2,116,483	0.2%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
71	Corvid Technologies, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,092,228	0.2%	Rank history: not on the FY2022–FY2025 lists; up 163 since FY2020.
72	Blackhorse, A Parsons LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,091,329	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Toyon Research Corporation Top NAICS codes 541713 Research and Development in Nanotechnology 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$2,034,256	0.2%	Rank history: not on the FY2022–FY2025 lists; up 157 since FY2020.
74	General Dynamics Mission Systems, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$2,010,271	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Olgoonik Federal, LLC Top NAICS codes 561210 Facilities Support Services	$1,963,397	0.2%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
76	Seventh Sense, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,956,531	0.2%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
77	Chulalongkorn University Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$1,821,935	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Integration Technologies Group, Inc. Top NAICS codes 541519 Other Computer Related Services	$1,770,839	0.1%	Rank history: #75 in FY2022, not on the FY2023 list, #93 in FY2024 and #100 in FY2025; up 203 since FY2020.
79	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)	$1,726,553	0.1%	Rank history: not on the FY2022–FY2025 lists; up 23 since FY2020.
80	Cantada, Inc. Top NAICS codes 541512 Computer Systems Design Services	$1,642,643	0.1%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
81	Francisco Partners Management Through Everfox LLC Top NAICS codes 541512 Computer Systems Design Services	$1,558,151	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Red Wire Technologies LLC	$1,532,552	0.1%	Rank history: #72 in FY2022, not on the FY2023 list, #82 in FY2024 and not on the FY2025 list; down 30 since FY2020.
83	Aurora Systems Consulting Inc. Top NAICS codes 541519 Other Computer Related Services	$1,520,170	0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
84	Sierra Nevada Company, LLC Top NAICS codes 511210 Software Publishers 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,520,139	0.1%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
85	WWC Global LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$1,485,263	0.1%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
86	BNC Corp. Top NAICS codes 334517 Irradiation Apparatus Manufacturing	$1,465,470	0.1%	Rank history: not on the FY2022 list, #56 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
87	Blue Ridge Envisioneering, Inc. Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$1,433,665	0.1%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
88	Carahsoft Technology Corp Top NAICS codes 511210 Software Publishers	$1,418,578	0.1%	Rank history: #76 in FY2022, not on the FY2023 list, #94 in FY2024 and #33 in FY2025; up 11 since FY2020.
89	Prenosis, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,400,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Centeio Associates Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$1,381,927	0.1%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
91	The Boeing Company Through Boeing Intelligence & Analytics, Inc. Top NAICS codes 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$1,353,918	0.1%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
92	Ludlum Measurements, Inc. Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology) 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,336,476	0.1%	Rank history: not on the FY2022–FY2025 lists; up 72 since FY2020.
93	Institut Pasteur DU Laos Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$1,328,987	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Bluehalo Labs, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$1,267,500	0.1%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
95	Able Force, Inc. Top NAICS codes 561110 Office Administrative Services	$1,264,772	0.1%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
96	Teledyne Technologies Incorporated Through Teledyne Flir Defense, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,250,000	0.1%	Rank history: #57 in FY2022, not on the FY2023 list, #47 in FY2024 and #68 in FY2025; new, not ranked in FY2020.
97	Ares Security Corporation Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,225,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 170 since FY2020.
98	Saint-Gobain Corporation (1) Through Luxium Solutions, LLC Top NAICS codes 334519 Other Measuring and Controlling Device Manufacturing	$1,216,585	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Combustion Research & Flow Technology Inc. Top NAICS codes 541713 Research and Development in Nanotechnology 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$1,190,902	0.1%	Rank history: not on the FY2022–FY2023 lists, #98 in FY2024 and not on the FY2025 list; up 37 since FY2020.
100	Opticslah, LLC Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$1,180,155	0.1%	Rank history: not on the FY2022–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 $1.27 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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