Top 100 Contractors in NAICS 5416: Management, Scientific, and Technical Consulting Services, FY2021

Name: Top 100 Contractors in NAICS 5416: Management, Scientific, and Technical Consulting Services, FY2021
Creator: GovTribe

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

The top 10 won 22% of FY2021 NAICS 5416 contract dollars

Contract obligations: $19,451,026,693 Net of deobligations, by contracts coded NAICS 5416 or a code under it
Contractors: 5,407 Parent companies with an obligation
Largest contractor: Chemonics International, Inc. $1.37 billion, 6.5% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$1,370,724,328	6.5%	Rank history: #1 in FY2022, #2 in FY2023, #2 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	Deloitte LLP 5 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHS (Department of Homeland Security)	$646,277,296	3.0%	Rank history: #3 in FY2022, #3 in FY2023, #3 in FY2024 and #2 in FY2025; up 4 since FY2020.
3	Booz Allen Hamilton Holding Corporation 3 awardees, including Booz Allen Hamilton Inc. Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) VA (Department of Veterans Affairs)	$465,707,358	2.2%	Rank history: #4 in FY2022, #5 in FY2023, #5 in FY2024 and #3 in FY2025; unchanged since FY2020.
4	General Dynamics Corporation 12 awardees, including General Dynamics Information Technology, Inc., Csra LLC and Arma Global Corporation Top agencies DOS (Department of State) HHS (Department of Health and Human Services) Army (Department of the Army)	$398,956,832	1.9%	Rank history: #19 in FY2022, #6 in FY2023, #6 in FY2024 and #4 in FY2025; unchanged since FY2020.
5	Deployed Resources LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$371,885,670	1.8%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #5 in FY2025; up 3 since FY2020.
6	Highlight Technologies, LLC Top agencies SBA (Small Business Administration) USAID (US Agency for International Development) HHS (Department of Health and Human Services)	$305,322,755	1.4%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
7	Guidehouse Inc. 2 awardees Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) DOS (Department of State)	$304,435,478	1.4%	Rank history: #5 in FY2022, #4 in FY2023, #4 in FY2024 and #6 in FY2025; up 2 since FY2020.
8	PAE Government Services Inc. 7 awardees, including Macfadden & Associates, Inc., Metis Solutions, LLC and FCI Federal, LLC Top agencies USAID (US Agency for International Development) DOS (Department of State) DOJ (Department of Justice)	$268,849,794	1.3%	Rank history: #6 in FY2022, #11 in FY2023, #50 in FY2024 and not on the FY2025 list; up 7 since FY2020.
9	Ingenesis Inc. Through Kelly Services, Inc. Top agencies HHS (Department of Health and Human Services)	$226,752,236	1.1%	Rank history: #9 in FY2022, #14 in FY2023, #43 in FY2024 and not on the FY2025 list; down 2 since FY2020.
10	The Boston Consulting Group Inc 2 awardees, including BCG Federal Corp. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy) USAF (Department of the Air Force)	$218,734,605	1.0%	Rank history: #14 in FY2022, #8 in FY2023, #13 in FY2024 and not on the FY2025 list; up 1 since FY2020.
11	ICF International, Inc. 4 awardees, including ICF Incorporated, L.L.C., ICF Macro Inc. and ICF Consulting Group, Inc. Top agencies HHS (Department of Health and Human Services) EPA (Environmental Protection Agency) DOJ (Department of Justice)	$218,517,542	1.0%	Rank history: #8 in FY2022, #9 in FY2023, #98 in FY2024 and not on the FY2025 list; up 1 since FY2020.
12	Lockheed Martin Corporation 9 awardees Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$185,446,349	0.9%	Rank history: #10 in FY2022, #10 in FY2023, #7 in FY2024 and #7 in FY2025; up 11 since FY2020.
13	Aitc-Five Domains Joint Venture,Llc Top agencies Army (Department of the Army)	$183,478,113	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
14	Science Applications International Corporation 8 awardees, including Forfeiture Support Associates LLC and Engility Services, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) OPM (Office of Personnel Management)	$182,722,910	0.9%	Rank history: #27 in FY2022, #31 in FY2023, #73 in FY2024 and #28 in FY2025; down 9 since FY2020.
15	Grant Thornton International Ltd 2 awardees, including Grant Thornton LLP and Grant Thornton Public Sector LLC Top agencies DHS (Department of Homeland Security) DOS (Department of State) Commerce (Department of Commerce)	$169,921,819	0.8%	Rank history: #11 in FY2022, #21 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
16	Research Triangle Institute 2 awardees, including International Resources Group Ltd. Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) EPA (Environmental Protection Agency)	$151,432,244	0.7%	Rank history: #15 in FY2022, #17 in FY2023, #10 in FY2024 and #14 in FY2025; up 3 since FY2020.
17	Accenture Federal Services LLC 2 awardees Top agencies DHS (Department of Homeland Security) Treasury (Department of the Treasury) Navy (Department of the Navy)	$148,211,316	0.7%	Rank history: #48 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
18	Tetra Tech, Inc. 27 awardees, including Management Systems International, Inc., Advanced Management Technology, Inc. and The Kaizen Company, LLC Top agencies EPA (Environmental Protection Agency) USAID (US Agency for International Development) DOT (Department of Transportation)	$142,789,831	0.7%	Rank history: #13 in FY2022, #15 in FY2023, #12 in FY2024 and #16 in FY2025; up 2 since FY2020.
19	The Mitre Corporation Top agencies Treasury (Department of the Treasury) Commerce (Department of Commerce) DHA (Defense Health Agency)	$133,433,982	0.6%	Rank history: #17 in FY2022, #22 in FY2023, #16 in FY2024 and #32 in FY2025; up 7 since FY2020.
20	Logistics Management Institute 2 awardees, including The Tauri Group, Inc. Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army) HHS (Department of Health and Human Services)	$132,206,941	0.6%	Rank history: #22 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
21	RER Solutions, Inc. Top agencies SBA (Small Business Administration) Army (Department of the Army) Treasury (Department of the Treasury)	$131,839,251	0.6%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; down 19 since FY2020.
22	Mathematica Inc 2 awardees Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) DOL (Department of Labor)	$121,894,871	0.6%	Rank history: #21 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
23	Magellan Health, Inc. 2 awardees, including Magellan Federal, Inc. and Magellan Healthcare Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$114,595,685	0.5%	Rank history: #33 in FY2022, #12 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
24	National Exchange Carrier Association Inc. Through Universal Service Administrative Company Top agencies FCC (Federal Communications Commission)	$114,185,000	0.5%	Rank history: #55 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
25	Leidos Holdings, Inc. 12 awardees, including Leidos, Inc. Top agencies NASA (National Aeronautics and Space Administration) DOJ (Department of Justice) Army (Department of the Army)	$108,392,471	0.5%	Rank history: #24 in FY2022, #30 in FY2023, #32 in FY2024 and #45 in FY2025; down 1 since FY2020.
26	On Assignment, Inc. 3 awardees, including ECS Federal, LLC Top agencies DOJ (Department of Justice) DARPA (Defense Advanced Research Projects Agency) HHS (Department of Health and Human Services)	$107,478,610	0.5%	Rank history: #66 in FY2022, #82 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
27	National Opinion Research Center Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) EEOC (Equal Employment Opportunity Commission)	$104,221,448	0.5%	Rank history: #20 in FY2022, #33 in FY2023, #66 in FY2024 and #84 in FY2025; up 8 since FY2020.
28	Universal Service Administrative Company Top agencies FCC (Federal Communications Commission)	$102,600,000	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	General Atomic Technologies Corporation 2 awardees, including General Atomics Aeronautical Systems, Inc. and General Atomics Top agencies USAF (Department of the Air Force) USUHS (DOD Uniformed Services University of the Health Sciences)	$100,879,637	0.5%	Rank history: #16 in FY2022, #25 in FY2023, #15 in FY2024 and not on the FY2025 list; up 27 since FY2020.
30	Teamstaff Inc. 4 awardees, including DLH Solutions Inc., Danya International LLC and Irving Burton Associates, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Army (Department of the Army)	$97,162,167	0.5%	Rank history: #18 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
31	Bowhead Logistics Management, LLC Top agencies Army (Department of the Army)	$95,072,603	0.4%	Rank history: not on the FY2022 list, #56 in FY2023 and not on the FY2024–FY2025 lists; up 291 since FY2020.
32	Fluor Corporation 2 awardees, including Fluor Enterprises, Inc. Top agencies DHS (Department of Homeland Security)	$94,112,133	0.4%	Rank history: not on the FY2022 list, #23 in FY2023, #19 in FY2024 and #12 in FY2025; up 9 since FY2020.
33	Cherokee Nation 9 awardees, including Cherokee Nation Strategic Programs, L.L.C., Cherokee Federal Solutions, L.L.C. and Cherokee Nation Management & Consulting, L.l.c.. Top agencies DOS (Department of State) Army (Department of the Army) DHA (Defense Health Agency)	$93,233,775	0.4%	Rank history: #43 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
34	Cognosante Holdings, LLC Through Cognosante, LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) SSA (Social Security Administration)	$86,319,976	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Acumen LLC Top agencies HHS (Department of Health and Human Services)	$86,289,177	0.4%	Rank history: #28 in FY2022, #35 in FY2023, #34 in FY2024 and #43 in FY2025; up 19 since FY2020.
36	Serco North America (Holdings) Inc 4 awardees, including Serco Inc. and Whitney Bradley & Brown, Inc. Top agencies DHS (Department of Homeland Security) DOL (Department of Labor) Navy (Department of the Navy)	$85,786,834	0.4%	Rank history: #29 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
37	Reli Group Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) CPSC (Consumer Product Safety Commission)	$81,948,790	0.4%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
38	ABT Global LLC 2 awardees Top agencies HHS (Department of Health and Human Services) HUD (Department of Housing and Urban Development) USAID (US Agency for International Development)	$81,669,292	0.4%	Rank history: #26 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
39	Highpoint Global, LLC Through Highpoint Digital, Inc. Top agencies HHS (Department of Health and Human Services)	$76,833,120	0.4%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
40	Westat, Inc. Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation) EEOC (Equal Employment Opportunity Commission)	$73,935,645	0.3%	Rank history: #50 in FY2022, #53 in FY2023, #31 in FY2024 and not on the FY2025 list; down 8 since FY2020.
41	Mantech International Corporation 5 awardees, including Mantech Advanced Systems International, Inc., Mantech SRS Technologies, Inc. and Mantech Mgs, Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) MDA (DOD Missile Defense Agency)	$70,762,759	0.3%	Rank history: #35 in FY2022, #48 in FY2023, #92 in FY2024 and not on the FY2025 list; up 24 since FY2020.
42	Amentum Services, Inc. 3 awardees, including Dyncorp International LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOS (Department of State)	$69,984,675	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	International Business Machines Corporation 3 awardees Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) HHS (Department of Health and Human Services)	$69,379,079	0.3%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
44	System One Holdings, LLC Through Gap Solutions, Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) OSD (Office of the Secretary of Defense)	$68,363,272	0.3%	Rank history: #30 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; up 360 since FY2020.
45	Jacobs Engineering Group Inc. 7 awardees, including Ch2M Hill - CDM Pa-Tac Recovery Services, Amentum Technology, Inc. and Ch2M Hill International Services, Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Army (Department of the Army)	$64,293,264	0.3%	Rank history: not on the FY2022–FY2025 lists; down 27 since FY2020.
46	TMF Health Quality Institute 2 awardees, including C2C Innovative Solutions, Inc. Top agencies HHS (Department of Health and Human Services)	$62,101,047	0.3%	Rank history: #25 in FY2022, not on the FY2023–FY2024 lists and #36 in FY2025; up 5 since FY2020.
47	Resilience Action Partners Top agencies DHS (Department of Homeland Security)	$54,154,372	0.3%	Rank history: #71 in FY2022, #67 in FY2023, #71 in FY2024 and not on the FY2025 list; up 56 since FY2020.
48	CACI International Inc. 7 awardees, including Caci, Inc. - Federal, Caci-Wgi, LLC and Caci-Iss, LLC Top agencies USSOCOM (United States Special Operations Command) Navy (Department of the Navy) DHS (Department of Homeland Security)	$53,796,168	0.3%	Rank history: #45 in FY2022, #72 in FY2023, #100 in FY2024 and #91 in FY2025; down 6 since FY2020.
49	Inverness Technologies Inc. Top agencies Army (Department of the Army)	$53,082,375	0.2%	Rank history: #47 in FY2022 and not on the FY2023–FY2025 lists; up 96 since FY2020.
50	Aptive HTG LLC Top agencies VA (Department of Veterans Affairs)	$52,364,673	0.2%	Rank history: #37 in FY2022, #38 in FY2023, #45 in FY2024 and #64 in FY2025; up 21 since FY2020.
51	Koniag, Inc. 8 awardees, including Pacarctic, LLC, Eagle Harbor Solutions LLC and Kadiak LLC Top agencies DOS (Department of State) DOE (Department of Energy) DHA (Defense Health Agency)	$50,484,107	0.2%	Rank history: #32 in FY2022, #36 in FY2023, not on the FY2024 list and #50 in FY2025; up 46 since FY2020.
52	Trilogy Federal, LLC Top agencies VA (Department of Veterans Affairs)	$50,324,635	0.2%	Rank history: #51 in FY2022, not on the FY2023 list, #95 in FY2024 and not on the FY2025 list; up 120 since FY2020.
53	Dexis Interactive LLC 2 awardees, including Checchi and Company Consulting, Inc. Top agencies USAID (US Agency for International Development) DOS (Department of State)	$50,155,668	0.2%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; up 42 since FY2020.
54	Calibre Systems Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) Navy (Department of the Navy)	$49,039,995	0.2%	Rank history: #52 in FY2022, #66 in FY2023, #76 in FY2024 and #81 in FY2025; up 18 since FY2020.
55	Maximus Inc. 3 awardees, including Maximus Federal Services, Inc. and Q2 Administrators, LLC Top agencies HHS (Department of Health and Human Services) SSA (Social Security Administration) VA (Department of Veterans Affairs)	$46,895,989	0.2%	Rank history: #81 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
56	Mckinsey & Company, Inc. Through Mckinsey & Company, Inc. Washington D.c. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) Army (Department of the Army)	$45,541,128	0.2%	Rank history: #38 in FY2022, #74 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
57	Potawatomi Business Development Corp 2 awardees, including Advancia Technologies, LLC and Advancia Aeronautics, LLC Top agencies DHA (Defense Health Agency) Navy (Department of the Navy)	$45,535,086	0.2%	Rank history: #70 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
58	The Chenega Corporation 9 awardees, including Chenega Healthcare Services LLC, Chenega Reliable Services LLC and Time Solutions, LLC Top agencies SEC (Securities and Exchange Commission) DHA (Defense Health Agency) Navy (Department of the Navy)	$45,476,102	0.2%	Rank history: not on the FY2022–FY2025 lists; up 47 since FY2020.
59	American Institutes for Research In the Behavioral Sciences 3 awardees, including Impaq International, LLC and Growth Transitions Inc. Top agencies HHS (Department of Health and Human Services) DOL (Department of Labor) ED (Department of Education)	$44,447,470	0.2%	Rank history: #44 in FY2022, #54 in FY2023, #46 in FY2024 and not on the FY2025 list; up 37 since FY2020.
60	Unwin Co Top agencies DOE (Department of Energy) DOL (Department of Labor)	$44,447,135	0.2%	Rank history: #58 in FY2022, #79 in FY2023, #79 in FY2024 and not on the FY2025 list; up 20 since FY2020.
61	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) HHS (Department of Health and Human Services) DOL (Department of Labor)	$43,650,547	0.2%	Rank history: #49 in FY2022, #39 in FY2023, #20 in FY2024 and #41 in FY2025; down 3 since FY2020.
62	Kpmg L.L.P. 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DCSA (Defense Counterintelligence and Security Agency)	$43,298,086	0.2%	Rank history: #23 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; up 32 since FY2020.
63	Aptive Resources LLC Top agencies VA (Department of Veterans Affairs) OPM (Office of Personnel Management) NSF (National Science Foundation)	$43,295,008	0.2%	Rank history: not on the FY2022–FY2025 lists; up 62 since FY2020.
64	H.i.g. Capital Management Inc. 2 awardees, including Empower AI, Inc. Top agencies HHS (Department of Health and Human Services)	$43,191,395	0.2%	Rank history: #73 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; up 111 since FY2020.
65	Analytic Services Inc. 3 awardees, including Professional, Acquisition, and Technical Services, Inc. and Advanced Technology International Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army) WHS (DOD Washington Headquarters Service)	$43,180,024	0.2%	Rank history: #56 in FY2022, #62 in FY2023, #77 in FY2024 and #82 in FY2025; up 1 since FY2020.
66	Creative Associates International, Inc. Top agencies USAID (US Agency for International Development)	$42,560,822	0.2%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; up 216 since FY2020.
67	Yorktown Systems Group Inc. Top agencies USSOCOM (United States Special Operations Command) MDA (DOD Missile Defense Agency)	$42,435,450	0.2%	Rank history: not on the FY2022–FY2025 lists; down 34 since FY2020.
68	National Academy of Sciences Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) EPA (Environmental Protection Agency)	$41,596,983	0.2%	Rank history: not on the FY2022 list, #85 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
69	Parsons Corporation 3 awardees, including Parsons Government Services Inc. Top agencies DOE (Department of Energy) MDA (DOD Missile Defense Agency) Commerce (Department of Commerce)	$41,330,069	0.2%	Rank history: not on the FY2022–FY2023 lists, #74 in FY2024 and #13 in FY2025; down 19 since FY2020.
70	Nakupuna Solutions, LLC Top agencies Navy (Department of the Navy) DOS (Department of State) HUD (Department of Housing and Urban Development)	$40,745,931	0.2%	Rank history: #91 in FY2022, #100 in FY2023, #61 in FY2024 and #80 in FY2025; up 17 since FY2020.
71	Eagle Hill Consulting, LLC Top agencies HHS (Department of Health and Human Services) GSA (General Services Administration) DHS (Department of Homeland Security)	$40,524,643	0.2%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
72	Michael Stapleton Associates, Ltd. Top agencies DOS (Department of State)	$40,486,835	0.2%	Rank history: not on the FY2022–FY2024 lists and #95 in FY2025; up 27 since FY2020.
73	All Native Synergies Company Top agencies DOS (Department of State) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$40,445,080	0.2%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
74	Your Recruiting Company, Inc. Top agencies Commerce (Department of Commerce) HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$40,401,066	0.2%	Rank history: #63 in FY2022, #42 in FY2023, #68 in FY2024 and not on the FY2025 list; up 3 since FY2020.
75	Brillient Corporation Top agencies HHS (Department of Health and Human Services) SBA (Small Business Administration) Treasury (Department of the Treasury)	$40,393,734	0.2%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; down 50 since FY2020.
76	Management Analysis Technologies (Mat), Incorporated Top agencies Army (Department of the Army) DHRA (Defense Human Resources Activity)	$40,236,990	0.2%	Rank history: #72 in FY2022, #50 in FY2023, #41 in FY2024 and #39 in FY2025; up 98 since FY2020.
77	Titan Alpha LLC Top agencies VA (Department of Veterans Affairs)	$39,917,207	0.2%	Rank history: #54 in FY2022, #68 in FY2023, #38 in FY2024 and not on the FY2025 list; up 251 since FY2020.
78	Zeiders Enterprises, Inc. Top agencies DODEA (Department of Defense Education Activity)	$39,324,809	0.2%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; down 23 since FY2020.
79	Linquest Corporation 2 awardees, including The Perduco Group, Inc. Top agencies USAF (Department of the Air Force)	$39,234,027	0.2%	Rank history: not on the FY2022–FY2025 lists; up 155 since FY2020.
80	Vera Institute of Justice, Inc. Top agencies DOJ (Department of Justice)	$39,130,797	0.2%	Rank history: not on the FY2022–FY2025 lists; up 38 since FY2020.
81	Boston Government Services, LLC Top agencies DOE (Department of Energy)	$38,974,274	0.2%	Rank history: #61 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
82	The Boeing Company 5 awardees, including Boeing Aerospace Operations, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOJ (Department of Justice)	$38,574,182	0.2%	Rank history: not on the FY2022 list, #40 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
83	Enterprise Resource Performance, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) SEC (Securities and Exchange Commission)	$37,507,728	0.2%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
84	Project Enhancement Corporation Top agencies DOE (Department of Energy) DOL (Department of Labor)	$37,003,777	0.2%	Rank history: #69 in FY2022, #57 in FY2023, #64 in FY2024 and #54 in FY2025; down 23 since FY2020.
85	Winnebago Tribe of Nebraska 2 awardees, including HCI Management Services Company Top agencies DOS (Department of State)	$36,378,502	0.2%	Rank history: not on the FY2022–FY2025 lists; up 31 since FY2020.
86	National Collegiate Inventors & Innovators Alliance, Inc. Top agencies HHS (Department of Health and Human Services)	$36,278,326	0.2%	Rank history: #57 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; up 64 since FY2020.
87	Seventh Sense, LLC Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration) Commerce (Department of Commerce)	$35,806,149	0.2%	Rank history: not on the FY2022–FY2025 lists; up 20 since FY2020.
88	Veterans Technology, L.L.C. Top agencies MDA (DOD Missile Defense Agency)	$34,748,477	0.2%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
89	Union Station Venture, Ltd. 2 awardees, including Jones Lang Lasalle Americas, Inc. Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense) SEC (Securities and Exchange Commission)	$34,698,598	0.2%	Rank history: #79 in FY2022, #47 in FY2023, #70 in FY2024 and not on the FY2025 list; down 20 since FY2020.
90	Afognak Native Corporation 11 awardees, including Alutiiq Information Management, LLC, Alutiiq Manufacturing Contractors, LLC and Alutiiq Solutions, LLC Top agencies DOS (Department of State) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$34,181,662	0.2%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; up 51 since FY2020.
91	DAI Global LLC 2 awardees Top agencies USAID (US Agency for International Development)	$33,871,748	0.2%	Rank history: not on the FY2022 list, #43 in FY2023, #44 in FY2024 and #57 in FY2025; up 53 since FY2020.
92	Eagle Health, LLC Top agencies USAID (US Agency for International Development) Army (Department of the Army) DHA (Defense Health Agency)	$33,730,803	0.2%	Rank history: not on the FY2022–FY2025 lists; up 29 since FY2020.
93	Goldbelt, Incorporated 6 awardees, including Goldbelt Glacier Health Services, LLC, Goldbelt C6, LLC and Nisga'a Tek, LLC Top agencies Army (Department of the Army) Treasury (Department of the Treasury) DOS (Department of State)	$33,471,751	0.2%	Rank history: #99 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 91 since FY2020.
94	Nana Regional Corporation Inc 7 awardees, including Tuva LLC, Cloud Lake Technology LLC and Tuvli LLC Top agencies DOJ (Department of Justice) DOS (Department of State) DOE (Department of Energy)	$33,093,452	0.2%	Rank history: not on the FY2022–FY2025 lists; up 102 since FY2020.
95	Lynker Corporation Top agencies Commerce (Department of Commerce)	$32,970,830	0.2%	Rank history: not on the FY2022–FY2024 lists and #62 in FY2025; down 19 since FY2020.
96	Health Services Holdings Inc. 2 awardees, including Health Services Advisory Group, Inc. Top agencies HHS (Department of Health and Human Services) OPM (Office of Personnel Management)	$32,817,183	0.2%	Rank history: #42 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; down 33 since FY2020.
97	Seneca Global Services LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) USAF (Department of the Air Force)	$32,342,301	0.2%	Rank history: not on the FY2022–FY2025 lists; up 141 since FY2020.
98	PM Consulting Group LLC Top agencies USAID (US Agency for International Development) Army (Department of the Army) DHA (Defense Health Agency)	$32,302,780	0.2%	Rank history: #87 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; up 53 since FY2020.
99	Bytecubed LLC 2 awardees, including Intelliware Systems Inc. Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security) NARA (National Archives and Records Administration)	$31,730,748	0.1%	Rank history: not on the FY2022–FY2025 lists; up 56 since FY2020.
100	Environmental Incentives, Inc. Top agencies USAID (US Agency for International Development)	$30,810,537	0.1%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 56 since FY2020.

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100 of 5,407 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 5416

Code	Net obligations	Largest contractor
54161 Management Consulting Services	$16,522,881,398	Chemonics International, Inc.
54169 Other Scientific and Technical Consulting Services	$1,910,533,167	Ingenesis Inc.
54162 Environmental Consulting Services	$1,017,612,128	Tetra Tech, Inc.

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 $21.2 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

Who were the top 10 NAICS 5416 contractors in FY2021?

1. Chemonics International, Inc. ($1.37B), 2. Deloitte LLP ($646M), 3. Booz Allen Hamilton Holding Corporation ($466M), 4. General Dynamics Corporation ($399M), 5. Deployed Resources LLC ($372M), 6. Highlight Technologies, LLC ($305M), 7. Guidehouse Inc. ($304M), 8. PAE Government Services Inc. ($269M), 9. Ingenesis Inc. ($227M), 10. The Boston Consulting Group Inc ($219M).

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