Top 100 Millennium Challenge Corporation Contractors, FY2021

Name: Top 100 Millennium Challenge Corporation Contractors, FY2021
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Agency page on GovTribe

The top 10 won 47% of FY2021 Millennium Challenge Corporation contract dollars

Contract obligations: $97,866,019 Net of deobligations, by the Millennium Challenge Corporation and its offices
Contractors: 167 Parent companies with an obligation
Largest contractor: Mathematica Inc $7.58 million, 7.2% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Mathematica Inc 2 awardees Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$7,575,274	7.2%	Rank history: #10 in FY2022, #4 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
2	Franklin Court Inc. Top NAICS codes 531120 Lessors of Nonresidential Buildings (except Miniwarehouses)	$7,247,759	6.9%	Rank history: #3 in FY2022, #1 in FY2023, not on the FY2024 list and #4 in FY2025; up 1 since FY2020.
3	Norda Stelo Inc 2 awardees Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541990 All Other Professional, Scientific, and Technical Services 541620 Environmental Consulting Services	$7,000,453	6.7%	Rank history: #6 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
4	TCG Inc. Top NAICS codes 541512 Computer Systems Design Services	$5,912,174	5.6%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; up 1 since FY2020.
5	1901 Group, LLC Top NAICS codes 541519 Other Computer Related Services	$5,039,803	4.8%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
6	Dynamic-Pro Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$3,745,092	3.6%	Rank history: #5 in FY2022, #5 in FY2023, #10 in FY2024 and #6 in FY2025; up 3 since FY2020.
7	IMC Worldwide Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$3,584,378	3.4%	Rank history: #22 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
8	Tetra Tech, Inc. 3 awardees, including Tetra TECH ES, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$3,375,056	3.2%	Rank history: #1 in FY2022, #8 in FY2023, #5 in FY2024 and not on the FY2025 list; down 4 since FY2020.
9	Nathan Associates LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 541611 Administrative Management and General Management Consulting Services 541690 Other Scientific and Technical Consulting Services	$3,027,018	2.9%	Rank history: #9 in FY2022, #7 in FY2023, #8 in FY2024 and #20 in FY2025; up 12 since FY2020.
10	Iron Vine Security LLC Top NAICS codes 511199 All Other Publishers	$2,734,980	2.6%	Rank history: #7 in FY2022, not on the FY2023 list, #11 in FY2024 and #5 in FY2025; up 1 since FY2020.
11	Stantec Incorporated Through Stantec Consulting Services Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$2,151,914	2.0%	Rank history: #13 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; up 115 since FY2020.
12	Social Impact Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$2,079,048	2.0%	Rank history: #43 in FY2022, #62 in FY2023, #17 in FY2024 and #7 in FY2025; up 8 since FY2020.
13	EXP U.S. Services Inc. Through EXP Federal Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,961,694	1.9%	Rank history: #16 in FY2022, #13 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
14	Mott Macdonald Group Ltd Through Mott Macdonald, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$1,661,229	1.6%	Rank history: #8 in FY2022, #10 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
15	Deloitte LLP Through Deloitte Consulting LLP Top NAICS codes 611430 Professional and Management Development Training 541990 All Other Professional, Scientific, and Technical Services	$1,649,877	1.6%	Rank history: #20 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
16	AECOM 2 awardees, including AECOM Technical Services, Inc. and URS Group, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541620 Environmental Consulting Services	$1,502,717	1.4%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
17	Sheladia Associates Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,462,136	1.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Kearney & Company, P.C. Top NAICS codes 541211 Offices of Certified Public Accountants 541219 Other Accounting Services	$1,419,649	1.4%	Rank history: #35 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
19	State of California Controllers Office Through The Regents of the University of California Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$1,262,221	1.2%	Rank history: not on the FY2022 list, #18 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
20	Dalberg Consulting US LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,220,853	1.2%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
21	Green Powered Technology LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,170,786	1.1%	Rank history: #24 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; up 54 since FY2020.
22	ICF International, Inc. 2 awardees, including ICF Incorporated, L.L.C. and Incentive Technology Group LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541513 Computer Facilities Management Services	$1,155,900	1.1%	Rank history: #34 in FY2022, #35 in FY2023, #32 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
23	Integrated Business & Technical Consultants, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,079,204	1.0%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
24	Guidehouse Inc. Top NAICS codes 519190 All Other Information Services 541611 Administrative Management and General Management Consulting Services	$1,000,230	1.0%	Rank history: #29 in FY2022, #27 in FY2023, #26 in FY2024 and #22 in FY2025; up 6 since FY2020.
25	Hazen and Sawyer, D.p.c. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$992,928	0.9%	Rank history: #23 in FY2022, #25 in FY2023, #19 in FY2024 and not on the FY2025 list; down 8 since FY2020.
26	Family Health International Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$964,797	0.9%	Rank history: #33 in FY2022, #29 in FY2023, #27 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
27	Mindseeker, Inc. Top NAICS codes 541519 Other Computer Related Services	$941,827	0.9%	Rank history: #14 in FY2022, #14 in FY2023, #7 in FY2024 and #3 in FY2025; down 4 since FY2020.
28	International Development Group Advisory Services, LLC Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$937,612	0.9%	Rank history: #36 in FY2022, not on the FY2023–FY2024 lists and #9 in FY2025; down 14 since FY2020.
29	Cloudburst Consulting Group, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$829,493	0.8%	Rank history: not on the FY2022–FY2025 lists; up 37 since FY2020.
30	Erm-Na Holdings Corp. Through Environmental Resources Management Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$815,732	0.8%	Rank history: #12 in FY2022, #19 in FY2023, #12 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
31	A2F Consulting LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$685,272	0.7%	Rank history: #32 in FY2022, #26 in FY2023, #30 in FY2024 and not on the FY2025 list; down 19 since FY2020.
32	IBF International Consulting Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$683,945	0.7%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.
33	African Wildlife Foundation Top NAICS codes 541620 Environmental Consulting Services	$680,913	0.6%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
34	Financial Markets International, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$638,384	0.6%	Rank history: #45 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
35	University Research Co., LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$637,739	0.6%	Rank history: #17 in FY2022, #64 in FY2023, #50 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
36	Washington Business Dynamics, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$632,646	0.6%	Rank history: #39 in FY2022, #37 in FY2023, #38 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
37	Cbre Inc. Top NAICS codes 561210 Facilities Support Services	$632,371	0.6%	Rank history: #53 in FY2022, #47 in FY2023, #34 in FY2024 and #17 in FY2025; unchanged since FY2020.
38	Louis Berger U.S. Inc. Through WSP Canada Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$628,661	0.6%	Rank history: #15 in FY2022, #41 in FY2023, #20 in FY2024 and not on the FY2025 list; down 28 since FY2020.
39	Ssg-Advisors LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$613,016	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	Hunton Andrews Kurth LLP Top NAICS codes 541110 Offices of Lawyers	$598,518	0.6%	Rank history: #52 in FY2022, #44 in FY2023, #39 in FY2024 and #18 in FY2025; down 11 since FY2020.
41	Crown Agents Limited 2 awardees Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$567,429	0.5%	Rank history: #21 in FY2022, #34 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
42	Nexcell Systems Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$563,000	0.5%	Rank history: #47 in FY2022, #91 in FY2023, #22 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
43	Jacobs Engineering Group Inc. Through Ch2M Hill, Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$554,518	0.5%	Rank history: not on the FY2022 list, #84 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
44	Regents of the University of Michigan Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$513,851	0.5%	Rank history: #91 in FY2022, #95 in FY2023, #62 in FY2024 and #49 in FY2025; down 18 since FY2020.
45	Insight Public Sector Inc. 2 awardees Top NAICS codes 511210 Software Publishers	$475,929	0.5%	Rank history: #48 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
46	Thirdway Africa Partners LLP Through Thirdway Impact Advisors Ltd Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$446,000	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	Limestone Analytics LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$412,256	0.4%	Rank history: #30 in FY2022, #15 in FY2023, #16 in FY2024 and #21 in FY2025; up 8 since FY2020.
48	Cpcs Transcom Limited Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$360,137	0.3%	Rank history: not on the FY2022 list, #58 in FY2023, #84 in FY2024 and not on the FY2025 list; down 9 since FY2020.
49	Instiglio, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$337,850	0.3%	Rank history: #44 in FY2022, #39 in FY2023, #40 in FY2024 and not on the FY2025 list; down 27 since FY2020.
50	MBO Partners Inc. Top NAICS codes 541219 Other Accounting Services	$306,914	0.3%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; down 42 since FY2020.
51	Alain Labeau Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$277,277	0.3%	Rank history: #65 in FY2022, #59 in FY2023, #60 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
52	Encompass LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$272,001	0.3%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
53	Management Systems International, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$262,798	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Definitive Logic Corporation Top NAICS codes 541519 Other Computer Related Services	$256,447	0.2%	Rank history: #67 in FY2022, #56 in FY2023, #46 in FY2024 and not on the FY2025 list; down 21 since FY2020.
55	Meyer Jeanmarie Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$251,324	0.2%	Rank history: not on the FY2022 list, #70 in FY2023, #90 in FY2024 and not on the FY2025 list; up 57 since FY2020.
56	Penn Parking Inc. Top NAICS codes 812930 Parking Lots and Garages	$242,707	0.2%	Rank history: #59 in FY2022, #53 in FY2023, #65 in FY2024 and #27 in FY2025; down 11 since FY2020.
57	Blaser Mitchell L Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$240,580	0.2%	Rank history: #71 in FY2022, #69 in FY2023, #64 in FY2024 and #48 in FY2025; down 14 since FY2020.
58	Omega World Travel Inc. Top NAICS codes 561510 Travel Agencies	$238,889	0.2%	Rank history: #57 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
59	Altai Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$235,630	0.2%	Rank history: not on the FY2022–FY2025 lists; up 61 since FY2020.
60	Ihealth Innovative Solution LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$222,431	0.2%	Rank history: #76 in FY2022, #75 in FY2023, #73 in FY2024 and #32 in FY2025; new, not ranked in FY2020.
61	Iproject Solutions, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$221,085	0.2%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; down 10 since FY2020.
62	Deloitte Conseil Tunisie Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$219,894	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Babatunde Onitiri Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$219,753	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Metis Markets LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$219,753	0.2%	Rank history: #73 in FY2022, #73 in FY2023, #70 in FY2024 and #30 in FY2025; new, not ranked in FY2020.
65	Allison Campbell Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$217,980	0.2%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
66	Man-Machine Systems Assessment (Msa), Incorporated Top NAICS codes 541330 Engineering Services	$211,106	0.2%	Rank history: #79 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; down 19 since FY2020.
67	Kate Lifanda Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$206,069	0.2%	Rank history: not on the FY2022–FY2025 lists; down 23 since FY2020.
68	New TECH Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$204,800	0.2%	Rank history: #75 in FY2022, #74 in FY2023 and not on the FY2024–FY2025 lists; up 56 since FY2020.
69	Mitsi A Sellers Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$200,999	0.2%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
70	Banyan Global Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$198,167	0.2%	Rank history: #41 in FY2022, #49 in FY2023, not on the FY2024 list and #52 in FY2025; new, not ranked in FY2020.
71	Goose Creek Consulting L.l.c Top NAICS codes 611430 Professional and Management Development Training	$196,044	0.2%	Rank history: #60 in FY2022, #45 in FY2023, #97 in FY2024 and not on the FY2025 list; up 72 since FY2020.
72	Debate Resiliente, Unipessoal, LDA Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$193,204	0.2%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
73	Alison M. Montgomery LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$192,883	0.2%	Rank history: #84 in FY2022, #88 in FY2023, #81 in FY2024 and #36 in FY2025; new, not ranked in FY2020.
74	Elbow Kent Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$191,844	0.2%	Rank history: #83 in FY2022, #82 in FY2023, #77 in FY2024 and #54 in FY2025; down 17 since FY2020.
75	DMV Solutions, L.L.C. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$191,612	0.2%	Rank history: #87 in FY2022, #97 in FY2023, #91 in FY2024 and #70 in FY2025; up 25 since FY2020.
76	Matthew, Lang Top NAICS codes 928110 National Security	$191,467	0.2%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; down 22 since FY2020.
77	Noma 360 Associates LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$188,513	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Dobrilovic Stevan D Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$186,008	0.2%	Rank history: #72 in FY2022, #71 in FY2023, #67 in FY2024 and not on the FY2025 list; down 20 since FY2020.
79	Goldman Kathryn Bacon Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$185,463	0.2%	Rank history: #89 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; down 29 since FY2020.
80	Rouguiata Bah Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$182,453	0.2%	Rank history: #92 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; down 21 since FY2020.
81	Bishop Sarah M Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$182,157	0.2%	Rank history: #93 in FY2022, #94 in FY2023, not on the FY2024 list and #71 in FY2025; down 13 since FY2020.
82	Goldsmith Rebecca Hales Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$179,210	0.2%	Rank history: #94 in FY2022, #98 in FY2023, #89 in FY2024 and not on the FY2025 list; down 21 since FY2020.
83	Rogers Sharon Elizabeth Top NAICS codes 541219 Other Accounting Services	$176,618	0.2%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
84	Ansell, Erin Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$175,022	0.2%	Rank history: not on the FY2022–FY2025 lists; down 19 since FY2020.
85	Kelly, Jaime Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$173,405	0.2%	Rank history: #96 in FY2022, #100 in FY2023, #92 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
86	Andy Handaka Pradjaputra Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$172,905	0.2%	Rank history: #97 in FY2022, not on the FY2023–FY2024 lists and #47 in FY2025; new, not ranked in FY2020.
87	Anne Pizer Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$166,337	0.2%	Rank history: #82 in FY2022, #79 in FY2023, #75 in FY2024 and not on the FY2025 list; down 15 since FY2020.
88	Dew Consulting Ltd Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$164,158	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Duval, Dominique Miriam Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$163,070	0.2%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
90	Knutson, Grant Michael Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$162,454	0.2%	Rank history: not on the FY2022–FY2025 lists; down 19 since FY2020.
91	Tarter Andrew Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$159,112	0.2%	Rank history: not on the FY2022–FY2024 lists and #73 in FY2025; down 15 since FY2020.
92	Myer Ethan S Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$156,375	0.1%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
93	Epstein Jessica Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$155,834	0.1%	Rank history: not on the FY2022–FY2023 lists, #94 in FY2024 and not on the FY2025 list; down 13 since FY2020.
94	The Rand Corporation Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$153,661	0.1%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
95	Reichart Caitlin N Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$152,132	0.1%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
96	Environnemental Network Consulting Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$148,240	0.1%	Rank history: not on the FY2022 list, #99 in FY2023, #52 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
97	Jones Jason D Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$144,603	0.1%	Rank history: not on the FY2022 list, #63 in FY2023, #86 in FY2024 and #37 in FY2025; down 15 since FY2020.
98	University of Toronto Through The Governing Council of the University of Toronto Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$144,310	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Rolfes Leonard Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$144,235	0.1%	Rank history: not on the FY2022–FY2025 lists; down 43 since FY2020.
100	Barthel Kevin Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$137,549	0.1%	Rank history: not on the FY2022 list, #81 in FY2023, #59 in FY2024 and #53 in FY2025; down 36 since FY2020.

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100 of 167 contractors listed here. See the rest on GovTribe.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $105 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

Who were the top 10 Millennium Challenge Corporation contractors in FY2021?

1. Mathematica Inc ($7.58M), 2. Franklin Court Inc. ($7.25M), 3. Norda Stelo Inc ($7M), 4. TCG Inc. ($5.91M), 5. 1901 Group, LLC ($5.04M), 6. Dynamic-Pro Inc. ($3.75M), 7. IMC Worldwide Inc. ($3.58M), 8. Tetra Tech, Inc. ($3.38M), 9. Nathan Associates LLC ($3.03M), 10. Iron Vine Security LLC ($2.73M).

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