Top 100 Contractors in NAICS 54199: All Other Professional, Scientific, and Technical Services, FY2021

Name: Top 100 Contractors in NAICS 54199: All Other Professional, Scientific, and Technical Services, FY2021
Creator: GovTribe

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

The top 10 won 38% of FY2021 NAICS 54199 contract dollars

Contract obligations: $10,850,256,469 Net of deobligations, by contracts coded NAICS 54199 or a code under it
Contractors: 2,869 Parent companies with an obligation
Largest contractor: Battelle Memorial Institute $1.35 billion, 11.9% 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	Battelle Memorial Institute 2 awardees, including Battelle Energy Alliance, LLC Top agencies DOE (Department of Energy) DOT (Department of Transportation) USSOCOM (United States Special Operations Command)	$1,351,753,259	11.9%	Rank history: #1 in FY2022, not on the FY2023 list, #1 in FY2024 and #1 in FY2025; up 2 since FY2020.
2	Sierra Nevada Company, LLC 2 awardees Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) OSD (Office of the Secretary of Defense)	$618,776,768	5.5%	Rank history: #3 in FY2022, #3 in FY2023, #4 in FY2024 and #4 in FY2025; unchanged since FY2020.
3	The Mitre Corporation 3 awardees Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DOJ (Department of Justice)	$430,016,227	3.8%	Rank history: #2 in FY2022, #2 in FY2023, #3 in FY2024 and #2 in FY2025; up 3 since FY2020.
4	America's Blood Centers Top agencies HHS (Department of Health and Human Services)	$325,195,248	2.9%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
5	Oak Ridge Associated Universities, Incorporated Top agencies DOE (Department of Energy) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$319,268,851	2.8%	Rank history: #4 in FY2022, #5 in FY2023, #6 in FY2024 and #9 in FY2025; down 1 since FY2020.
6	ABT Global LLC 2 awardees Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services)	$317,341,329	2.8%	Rank history: #6 in FY2022, #12 in FY2023, #11 in FY2024 and #10 in FY2025; up 2 since FY2020.
7	DAI Global LLC Top agencies USAID (US Agency for International Development)	$245,266,913	2.2%	Rank history: #5 in FY2022, #6 in FY2023, #7 in FY2024 and #13 in FY2025; unchanged since FY2020.
8	The Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies OSD (Office of the Secretary of Defense) USSOCOM (United States Special Operations Command) DISA (Defense Information Systems Agency)	$236,949,215	2.1%	Rank history: #12 in FY2022, #10 in FY2023, #87 in FY2024 and not on the FY2025 list; up 1 since FY2020.
9	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$222,823,854	2.0%	Rank history: #7 in FY2022, #9 in FY2023, #14 in FY2024 and #29 in FY2025; down 4 since FY2020.
10	Guidehouse Inc. 2 awardees Top agencies SBA (Small Business Administration) HHS (Department of Health and Human Services) USAID (US Agency for International Development)	$222,566,164	2.0%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
11	Booz Allen Hamilton Holding Corporation 3 awardees, including Booz Allen Hamilton Inc. Top agencies OSD (Office of the Secretary of Defense) DTRA (Defense Threat Reduction Agency) DARPA (Defense Advanced Research Projects Agency)	$205,564,508	1.8%	Rank history: #9 in FY2022, #7 in FY2023, #8 in FY2024 and #3 in FY2025; up 1 since FY2020.
12	Institute for Defense Analyses Top agencies OSD (Office of the Secretary of Defense) DSCA (Defense Security Cooperation Agency) Army (Department of the Army)	$204,292,789	1.8%	Rank history: #8 in FY2022, #8 in FY2023, #9 in FY2024 and #8 in FY2025; down 1 since FY2020.
13	RTX Corporation 11 awardees, including Raytheon Company and Nightwing Technologies, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USSOCOM (United States Special Operations Command)	$194,395,419	1.7%	Rank history: #13 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
14	Tetra Tech, Inc. 6 awardees, including Ard, Inc., Management Systems International, Inc. and Tetra TECH ES, Inc. Top agencies USAID (US Agency for International Development) DSCA (Defense Security Cooperation Agency)	$169,076,670	1.5%	Rank history: #19 in FY2022, #11 in FY2023, #12 in FY2024 and #59 in FY2025; up 7 since FY2020.
15	Deloitte LLP 3 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) USAF (Department of the Air Force)	$159,754,168	1.4%	Rank history: #18 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
16	Research Triangle Institute 2 awardees, including International Resources Group Ltd. Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$149,256,633	1.3%	Rank history: #15 in FY2022, #14 in FY2023, #15 in FY2024 and #21 in FY2025; down 1 since FY2020.
17	Northrop Grumman Corporation 5 awardees, including Northrop Grumman Systems Corporation and Northrop Grumman Technical Services, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) CFTC (Commodity Futures Trading Commission)	$133,534,041	1.2%	Rank history: #10 in FY2022, #13 in FY2023, #13 in FY2024 and #7 in FY2025; down 4 since FY2020.
18	The Rand Corporation Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army) MCC (Millennium Challenge Corporation)	$107,079,023	0.9%	Rank history: #16 in FY2022, #16 in FY2023, #21 in FY2024 and #24 in FY2025; down 4 since FY2020.
19	The CNA Corporation Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) USAF (Department of the Air Force)	$95,424,988	0.8%	Rank history: #20 in FY2022, #21 in FY2023, #24 in FY2024 and #22 in FY2025; down 3 since FY2020.
20	Medical Science & Computing, LLC Top agencies HHS (Department of Health and Human Services)	$84,750,892	0.7%	Rank history: #25 in FY2022, #27 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
21	UnitedHealth Group Incorporated 4 awardees, including Optumhealth Care Solutions, LLC, Optumserve Health Services, Inc. and The Lewin Group, Inc. Top agencies DHA (Defense Health Agency) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$81,049,051	0.7%	Rank history: #21 in FY2022, not on the FY2023 list, #34 in FY2024 and #40 in FY2025; up 2 since FY2020.
22	Palladium International LLC Top agencies USAID (US Agency for International Development)	$79,210,571	0.7%	Rank history: #22 in FY2022, #23 in FY2023, #45 in FY2024 and #48 in FY2025; down 3 since FY2020.
23	Noridian Mutual Insurance Company Through Noridian Healthcare Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$71,774,188	0.6%	Rank history: #36 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
24	Leidos Holdings, Inc. 10 awardees, including Leidos, Inc. Top agencies Army (Department of the Army) OSD (Office of the Secretary of Defense) Navy (Department of the Navy)	$71,374,514	0.6%	Rank history: #26 in FY2022, #22 in FY2023, #29 in FY2024 and #37 in FY2025; up 10 since FY2020.
25	Quality Health Strategies Inc. Through Qlarant Integrity Solutions LLC Top agencies HHS (Department of Health and Human Services)	$67,936,739	0.6%	Rank history: #24 in FY2022, #24 in FY2023, #41 in FY2024 and not on the FY2025 list; up 6 since FY2020.
26	CACI International Inc. 6 awardees, including Caci, Inc. - Federal, Caci Nss, LLC and Caci-Athena, LLC Top agencies USSOCOM (United States Special Operations Command) Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$67,913,773	0.6%	Rank history: #35 in FY2022, #50 in FY2023, #32 in FY2024 and #17 in FY2025; up 6 since FY2020.
27	Management Sciences for Health, Inc. Top agencies USAID (US Agency for International Development)	$67,351,796	0.6%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
28	PAE Government Services Inc. 5 awardees, including PAE National Security Solutions LLC and Centra Technology, Inc. Top agencies DTRA (Defense Threat Reduction Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$63,294,459	0.6%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
29	Black & Veatch Special Projects Corp. Top agencies DTRA (Defense Threat Reduction Agency)	$54,123,018	0.5%	Rank history: not on the FY2022 list, #92 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
30	Science Applications International Corporation 5 awardees, including Forfeiture Support Associates LLC Top agencies PBGC (Pension Benefit Guaranty Corporation) DTRA (Defense Threat Reduction Agency) DOJ (Department of Justice)	$53,271,583	0.5%	Rank history: #41 in FY2022, #38 in FY2023, #47 in FY2024 and not on the FY2025 list; up 17 since FY2020.
31	The American National Red Cross Top agencies HHS (Department of Health and Human Services)	$52,188,521	0.5%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
32	Westat, Inc. Top agencies HHS (Department of Health and Human Services)	$51,803,108	0.5%	Rank history: #29 in FY2022, #40 in FY2023, #67 in FY2024 and not on the FY2025 list; up 13 since FY2020.
33	Hewlett Packard Enterprise Co Through Safeguard Services LLC Top agencies HHS (Department of Health and Human Services)	$49,319,085	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Nana Regional Corporation Inc 6 awardees, including Tuvli LLC, Sava Workforce Solutions LLC and Rivertech LLC Top agencies DOS (Department of State) DOJ (Department of Justice) DOT (Department of Transportation)	$45,946,063	0.4%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; up 42 since FY2020.
35	Population Services International Top agencies USAID (US Agency for International Development)	$44,793,660	0.4%	Rank history: not on the FY2022 list, #58 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
36	Amentum Services, Inc. 2 awardees, including URS Federal Services International, Inc. Top agencies DTRA (Defense Threat Reduction Agency) Navy (Department of the Navy)	$43,065,282	0.4%	Rank history: #30 in FY2022 and not on the FY2023–FY2025 lists; up 56 since FY2020.
37	ICF International, Inc. 2 awardees, including ICF Macro Inc. and ICF Incorporated, L.L.C. Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$41,889,195	0.4%	Rank history: #45 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
38	Applied Research Associates, Inc. Top agencies DHS (Department of Homeland Security) DTRA (Defense Threat Reduction Agency) DOT (Department of Transportation)	$40,574,017	0.4%	Rank history: #99 in FY2022, not on the FY2023–FY2024 lists and #76 in FY2025; up 3 since FY2020.
39	WWC Global LLC Top agencies USSOCOM (United States Special Operations Command) Navy (Department of the Navy) DTRA (Defense Threat Reduction Agency)	$40,127,539	0.4%	Rank history: #51 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
40	Nathan Associates LLC Top agencies USAID (US Agency for International Development) MCC (Millennium Challenge Corporation)	$38,327,501	0.3%	Rank history: #61 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; up 74 since FY2020.
41	Education Development Center, Inc. Top agencies USAID (US Agency for International Development)	$37,848,874	0.3%	Rank history: #33 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; up 20 since FY2020.
42	Calibre Systems Inc. Top agencies Army (Department of the Army)	$36,377,842	0.3%	Rank history: #67 in FY2022, #56 in FY2023, #65 in FY2024 and #67 in FY2025; up 40 since FY2020.
43	AMN Healthcare Services Incorporated Through AMN Healthcare Inc. Top agencies DHS (Department of Homeland Security)	$35,633,429	0.3%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
44	BAE Systems PLC Through BAE Systems Technology Solutions & Services Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$35,429,275	0.3%	Rank history: #38 in FY2022, #39 in FY2023, #39 in FY2024 and not on the FY2025 list; up 23 since FY2020.
45	Chickasaw Health Consulting, LLC Top agencies HHS (Department of Health and Human Services) PBGC (Pension Benefit Guaranty Corporation)	$35,051,037	0.3%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; up 214 since FY2020.
46	The Boeing Company 7 awardees, including Tapestry Solutions, Inc. and Jeppesen Foreflight, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOT (Department of Transportation)	$33,533,470	0.3%	Rank history: #91 in FY2022, #53 in FY2023, #55 in FY2024 and #53 in FY2025; up 7 since FY2020.
47	Family Health International Top agencies USAID (US Agency for International Development) MCC (Millennium Challenge Corporation)	$32,844,920	0.3%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
48	Threat TEC - Yorktown JV, LLC Top agencies Army (Department of the Army)	$32,381,353	0.3%	Rank history: #58 in FY2022, #57 in FY2023, #50 in FY2024 and #96 in FY2025; up 9 since FY2020.
49	Novetta Solutions, LLC Through Accenture Federal Services LLC Top agencies USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service) DOS (Department of State)	$32,135,754	0.3%	Rank history: #43 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
50	JSI Research & Training Institute Inc. Top agencies USAID (US Agency for International Development)	$31,843,353	0.3%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
51	Hendall Inc. Top agencies HHS (Department of Health and Human Services)	$31,603,623	0.3%	Rank history: #49 in FY2022, #44 in FY2023, #48 in FY2024 and #73 in FY2025; up 72 since FY2020.
52	Social Solutions International, Inc. Top agencies USAID (US Agency for International Development)	$31,332,858	0.3%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; down 25 since FY2020.
53	Emsi Holding Company Through Coventbridge (USA) LLC Top agencies HHS (Department of Health and Human Services)	$30,968,795	0.3%	Rank history: #60 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
54	Mckinsey & Company, Inc. Through Mckinsey & Company, Inc. Washington D.c. Top agencies Army (Department of the Army) OSD (Office of the Secretary of Defense) Navy (Department of the Navy)	$30,024,388	0.3%	Rank history: not on the FY2022–FY2025 lists; up 72 since FY2020.
55	Actionable Solutions Group, LLC Top agencies USSOCOM (United States Special Operations Command)	$29,393,881	0.3%	Rank history: #34 in FY2022, #43 in FY2023, #85 in FY2024 and #98 in FY2025; up 47 since FY2020.
56	Aecom International Development Inc 2 awardees, including DT Global Inc. Top agencies USAID (US Agency for International Development)	$28,637,471	0.3%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
57	Systems Planning and Analysis, Inc. Top agencies OSD (Office of the Secretary of Defense) Navy (Department of the Navy)	$28,099,765	0.2%	Rank history: #65 in FY2022, #48 in FY2023, #66 in FY2024 and #38 in FY2025; up 42 since FY2020.
58	Nova Global Supply and Services LLC Through Valiant Global Defense Services Inc. Top agencies DTRA (Defense Threat Reduction Agency) Army (Department of the Army)	$27,463,266	0.2%	Rank history: #88 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
59	Pulau International Corporation Through Pulau Corporation Top agencies Army (Department of the Army)	$26,630,522	0.2%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
60	General Dynamics Corporation 7 awardees, including General Dynamics Information Technology, Inc., General Dynamics Mission Systems, Inc. and General Dynamics European Land Systems-Bridge Systems GMBH Top agencies DHA (Defense Health Agency) DTRA (Defense Threat Reduction Agency) Navy (Department of the Navy)	$26,275,756	0.2%	Rank history: #52 in FY2022, #54 in FY2023, #26 in FY2024 and #16 in FY2025; down 10 since FY2020.
61	Arctic Slope Mission Services LLC Top agencies EPA (Environmental Protection Agency)	$25,022,323	0.2%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; down 10 since FY2020.
62	Bennett Aerospace Inc. Top agencies DOJ (Department of Justice) Army (Department of the Army)	$24,651,059	0.2%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
63	Riverside Research Institute Top agencies USAF (Department of the Air Force)	$24,544,285	0.2%	Rank history: #71 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; up 7 since FY2020.
64	Lockheed Martin Corporation 6 awardees, including Lockheed Martin Global, Inc. and Lockheed Martin Coherent Technologies, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$24,422,498	0.2%	Rank history: not on the FY2022 list, #25 in FY2023, #30 in FY2024 and #26 in FY2025; up 54 since FY2020.
65	Ultra Electronics Forensic Technology Inc Top agencies DOJ (Department of Justice)	$23,910,689	0.2%	Rank history: not on the FY2022 list, #87 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
66	Kaiser Foundation Health Plan of Washington 2 awardees, including Kaiser Foundation Hospitals Top agencies HHS (Department of Health and Human Services)	$23,017,678	0.2%	Rank history: #81 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
67	Poplicus Incorporated Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense) USAF (Department of the Air Force)	$22,312,242	0.2%	Rank history: #63 in FY2022, #36 in FY2023, #23 in FY2024 and #39 in FY2025; up 30 since FY2020.
68	Janus Research Group, LLC Top agencies Army (Department of the Army)	$22,290,141	0.2%	Rank history: not on the FY2022–FY2025 lists; up 233 since FY2020.
69	Axle Informatics, LLC Top agencies HHS (Department of Health and Human Services)	$21,739,465	0.2%	Rank history: #85 in FY2022, #68 in FY2023, #27 in FY2024 and #61 in FY2025; down 21 since FY2020.
70	Sos International LLC Top agencies Army (Department of the Army)	$21,734,594	0.2%	Rank history: not on the FY2022–FY2025 lists; up 31 since FY2020.
71	Cardinal Government Services, Inc. Top agencies Commerce (Department of Commerce)	$21,424,607	0.2%	Rank history: not on the FY2022–FY2024 lists and #93 in FY2025; up 20 since FY2020.
72	The Boston Consulting Group Inc Through BCG Federal Corp. Top agencies Army (Department of the Army) USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service)	$20,880,772	0.2%	Rank history: not on the FY2022–FY2025 lists; up 36 since FY2020.
73	University Research Co., LLC Top agencies USAID (US Agency for International Development)	$20,628,309	0.2%	Rank history: not on the FY2022–FY2025 lists; down 11 since FY2020.
74	Strategic Analysis, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency)	$19,050,651	0.2%	Rank history: #57 in FY2022, #47 in FY2023, #33 in FY2024 and #20 in FY2025; up 68 since FY2020.
75	Jacobs Engineering Group Inc. 4 awardees, including Ch2M Hill, Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$18,833,988	0.2%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
76	National Collegiate Inventors & Innovators Alliance, Inc. Top agencies HHS (Department of Health and Human Services)	$18,790,356	0.2%	Rank history: #40 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
77	Panagora Group Inc. Top agencies USAID (US Agency for International Development)	$18,726,864	0.2%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; up 45 since FY2020.
78	Laulima Government Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$18,635,979	0.2%	Rank history: #90 in FY2022, not on the FY2023 list, #95 in FY2024 and #80 in FY2025; up 20 since FY2020.
79	Gryphon Technologies, Inc. Through Schafer Government Services, LLC Top agencies Navy (Department of the Navy) DARPA (Defense Advanced Research Projects Agency)	$18,589,679	0.2%	Rank history: not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; up 96 since FY2020.
80	Kapili Services, LLC Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force) Army (Department of the Army)	$17,599,875	0.2%	Rank history: not on the FY2022–FY2025 lists; up 25 since FY2020.
81	Linquest Corporation Top agencies USAF (Department of the Air Force)	$17,586,875	0.2%	Rank history: #82 in FY2022, #66 in FY2023, #75 in FY2024 and #63 in FY2025; up 292 since FY2020.
82	Cnfa Top agencies USAID (US Agency for International Development)	$17,497,238	0.2%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
83	Arctic Slope Regional Corporation 3 awardees, including Asrc Federal Cyber, LLC, Asrc Federal Field Services, LLC and Inuteq, LLC Top agencies Treasury (Department of the Treasury) Army (Department of the Army) MDA (DOD Missile Defense Agency)	$17,381,234	0.2%	Rank history: not on the FY2022–FY2024 lists and #36 in FY2025; new, not ranked in FY2020.
84	Dexis Interactive LLC 3 awardees, including Checchi and Company Consulting, Inc. and Dexis Professional Services, LLC Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services)	$17,362,515	0.2%	Rank history: not on the FY2022–FY2025 lists; up 257 since FY2020.
85	Management & Training Corporation Through MTC International Development Holding Company, LLC Top agencies USAID (US Agency for International Development)	$17,321,000	0.2%	Rank history: not on the FY2022 list, #94 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
86	Eagle Global Scientific, LLC Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$17,155,655	0.2%	Rank history: not on the FY2022–FY2025 lists; up 20 since FY2020.
87	American Type Culture Collection Top agencies HHS (Department of Health and Human Services)	$16,901,586	0.1%	Rank history: #54 in FY2022, #65 in FY2023, #59 in FY2024 and not on the FY2025 list; down 18 since FY2020.
88	Winrock International Institute for Agricultural Development Top agencies USAID (US Agency for International Development)	$16,853,035	0.1%	Rank history: not on the FY2022 list, #80 in FY2023, #84 in FY2024 and not on the FY2025 list; up 24 since FY2020.
89	On Assignment, Inc. Through ECS Federal, LLC Top agencies DARPA (Defense Advanced Research Projects Agency) Commerce (Department of Commerce) Navy (Department of the Navy)	$16,814,789	0.1%	Rank history: #64 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; up 92 since FY2020.
90	Creative Associates International, Inc. Top agencies USAID (US Agency for International Development)	$16,676,202	0.1%	Rank history: #37 in FY2022, #28 in FY2023, #37 in FY2024 and not on the FY2025 list; down 55 since FY2020.
91	Parsons Corporation 3 awardees, including Ptsi Managed Services Inc., Parsons Government Services International Inc. and Ogsystems, LLC Top agencies DTRA (Defense Threat Reduction Agency) Army (Department of the Army) USAF (Department of the Air Force)	$16,311,419	0.1%	Rank history: #68 in FY2022, #19 in FY2023, #19 in FY2024 and #11 in FY2025; down 3 since FY2020.
92	National Association of State Mental Health Program Directors Inc. Top agencies HHS (Department of Health and Human Services)	$16,024,163	0.1%	Rank history: #76 in FY2022, #91 in FY2023, #92 in FY2024 and not on the FY2025 list; up 40 since FY2020.
93	National Academy of Sciences Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) NASA (National Aeronautics and Space Administration)	$16,014,129	0.1%	Rank history: not on the FY2022 list, #73 in FY2023, #94 in FY2024 and not on the FY2025 list; up 11 since FY2020.
94	The QED Group LLC Top agencies USAID (US Agency for International Development)	$15,571,553	0.1%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; up 69 since FY2020.
95	Government of Canada Through Canadian Commercial Corporation Top agencies Army (Department of the Army)	$15,536,560	0.1%	Rank history: not on the FY2022 list, #49 in FY2023 and not on the FY2024–FY2025 lists; up 38 since FY2020.
96	Changeis, Inc. Top agencies DOT (Department of Transportation)	$15,120,396	0.1%	Rank history: not on the FY2022–FY2025 lists; up 35 since FY2020.
97	Zero Point Inc. Top agencies USSOCOM (United States Special Operations Command)	$14,931,031	0.1%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
98	Financial Markets International, Inc. Top agencies USAID (US Agency for International Development) MCC (Millennium Challenge Corporation)	$14,766,780	0.1%	Rank history: not on the FY2022–FY2025 lists; up 294 since FY2020.
99	Cherokee Nation System Solutions LLC Top agencies DOI (Department of the Interior) DOJ (Department of Justice)	$14,750,204	0.1%	Rank history: not on the FY2022–FY2025 lists; up 133 since FY2020.
100	Serco North America (Holdings) Inc 2 awardees, including Serco Inc. Top agencies Commerce (Department of Commerce) Navy (Department of the Navy)	$14,729,656	0.1%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.

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100 of 2,869 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 54199

Code	Net obligations	Largest contractor
541990 All Other Professional, Scientific, and Technical Services	$10,850,256,469	Battelle Memorial Institute

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 $11.3 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 54199 contractors in FY2021?

1. Battelle Memorial Institute ($1.35B), 2. Sierra Nevada Company, LLC ($619M), 3. The Mitre Corporation ($430M), 4. America's Blood Centers ($325M), 5. Oak Ridge Associated Universities, Incorporated ($319M), 6. ABT Global LLC ($317M), 7. DAI Global LLC ($245M), 8. The Johns Hopkins University ($237M), 9. Chemonics International, Inc. ($223M), 10. Guidehouse Inc. ($223M).

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