Top 100 Contractors in NAICS 54169: Other Scientific and Technical Consulting Services, FY2021

Name: Top 100 Contractors in NAICS 54169: Other Scientific and Technical Consulting Services, FY2021
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

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

The top 10 won 34% of FY2021 NAICS 54169 contract dollars

Contract obligations: $1,910,533,167 Net of deobligations, by contracts coded NAICS 54169 or a code under it
Contractors: 1,266 Parent companies with an obligation
Largest contractor: Ingenesis Inc. $227 million, 10.8% 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	Ingenesis Inc. Through Kelly Services, Inc. Top agencies HHS (Department of Health and Human Services)	$226,752,236	10.8%	Rank history: #1 in FY2022, #1 in FY2023, #4 in FY2024 and not on the FY2025 list; unchanged since FY2020.
2	Lockheed Martin Corporation 4 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$119,721,406	5.7%	Rank history: #2 in FY2022, #2 in FY2023, #1 in FY2024 and #2 in FY2025; up 14 since FY2020.
3	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency) DARPA (Defense Advanced Research Projects Agency)	$66,171,851	3.2%	Rank history: #28 in FY2022, #19 in FY2023, #23 in FY2024 and #16 in FY2025; down 1 since FY2020.
4	Mantech International Corporation 2 awardees, including Mantech Advanced Systems International, Inc. and Mantech SRS Technologies, Inc. Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency) DARPA (Defense Advanced Research Projects Agency)	$53,477,678	2.6%	Rank history: #4 in FY2022, #8 in FY2023, #13 in FY2024 and #7 in FY2025; up 4 since FY2020.
5	Leidos Holdings, Inc. 5 awardees, including Leidos, Inc. Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army) DOT (Department of Transportation)	$50,155,319	2.4%	Rank history: #5 in FY2022, #3 in FY2023, #10 in FY2024 and not on the FY2025 list; down 2 since FY2020.
6	General Dynamics Corporation 3 awardees, including General Dynamics Information Technology, Inc. and General Dynamics One Source LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army) HHS (Department of Health and Human Services)	$43,133,664	2.1%	Rank history: #15 in FY2022, #12 in FY2023, #3 in FY2024 and #3 in FY2025; up 7 since FY2020.
7	Michael Stapleton Associates, Ltd. Top agencies DOS (Department of State)	$40,486,835	1.9%	Rank history: #16 in FY2022, #14 in FY2023, #12 in FY2024 and #10 in FY2025; unchanged since FY2020.
8	Linquest Corporation Top agencies USAF (Department of the Air Force)	$37,940,438	1.8%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
9	National Academy of Sciences Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) EPA (Environmental Protection Agency)	$35,652,613	1.7%	Rank history: #18 in FY2022, #11 in FY2023, #19 in FY2024 and #59 in FY2025; down 4 since FY2020.
10	Unwin Co Top agencies DOE (Department of Energy)	$33,705,862	1.6%	Rank history: #7 in FY2022, #6 in FY2023, #9 in FY2024 and #13 in FY2025; unchanged since FY2020.
11	Palladium International LLC Top agencies USAID (US Agency for International Development)	$28,893,225	1.4%	Rank history: #3 in FY2022, #22 in FY2023, #17 in FY2024 and #88 in FY2025; down 7 since FY2020.
12	RTX Corporation 3 awardees, including Raytheon Company and Noresco, LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security)	$28,783,450	1.4%	Rank history: #8 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
13	PAE Government Services, Inc. 3 awardees Top agencies DOS (Department of State) USAID (US Agency for International Development)	$28,356,070	1.4%	Rank history: #14 in FY2022, #10 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
14	Ameresco Inc. Through Ameresco Select, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$24,145,096	1.2%	Rank history: #25 in FY2022, #28 in FY2023, #31 in FY2024 and #20 in FY2025; up 6 since FY2020.
15	Yale New Haven Health Services Corporation Top agencies HHS (Department of Health and Human Services)	$24,108,446	1.2%	Rank history: #19 in FY2022, #23 in FY2023, #30 in FY2024 and #30 in FY2025; up 2 since FY2020.
16	Mathematica Inc Top agencies HHS (Department of Health and Human Services) MCC (Millennium Challenge Corporation)	$24,016,108	1.1%	Rank history: #24 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
17	On Assignment, Inc. 2 awardees, including ECS Federal, LLC Top agencies DARPA (Defense Advanced Research Projects Agency) DOJ (Department of Justice)	$22,340,592	1.1%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
18	Westat, Inc. Top agencies HHS (Department of Health and Human Services)	$21,920,963	1.0%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
19	Kbr, Inc. 2 awardees, including KBR Wyle Services, LLC and Dependable Global Solutions, LLC Top agencies NASA (National Aeronautics and Space Administration) DOE (Department of Energy)	$21,422,361	1.0%	Rank history: #23 in FY2022, #13 in FY2023, #94 in FY2024 and not on the FY2025 list; up 68 since FY2020.
20	Camp Dresser & Mckee Inc. 2 awardees, including CDM Federal Programs Corporation Top agencies DHS (Department of Homeland Security) DOT (Department of Transportation)	$18,018,026	0.9%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
21	Deloitte LLP 3 awardees, including Deloitte Consulting LLP and Deloitte & Touche LLP Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$16,864,639	0.8%	Rank history: #44 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; up 42 since FY2020.
22	Essex Management LLC Top agencies HHS (Department of Health and Human Services)	$15,976,355	0.8%	Rank history: #22 in FY2022, #21 in FY2023, #27 in FY2024 and #23 in FY2025; new, not ranked in FY2020.
23	JP Systems, Inc. Top agencies VA (Department of Veterans Affairs)	$15,513,015	0.7%	Rank history: #26 in FY2022, #17 in FY2023, #16 in FY2024 and not on the FY2025 list; down 2 since FY2020.
24	Accenture Federal Services LLC Top agencies Navy (Department of the Navy)	$15,311,190	0.7%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
25	Acumen LLC Top agencies HHS (Department of Health and Human Services)	$14,359,278	0.7%	Rank history: #21 in FY2022, #27 in FY2023, #35 in FY2024 and #58 in FY2025; down 6 since FY2020.
26	Ids International, LLC Top agencies DOS (Department of State)	$14,214,821	0.7%	Rank history: not on the FY2022–FY2023 lists, #38 in FY2024 and not on the FY2025 list; down 2 since FY2020.
27	The Tatitlek Corporation Through Tatitlek Technologies, LLC Top agencies DOS (Department of State)	$14,162,759	0.7%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; up 134 since FY2020.
28	Controlant HF. Top agencies Army (Department of the Army)	$14,112,725	0.7%	Rank history: #6 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
29	Hdr, Inc. 4 awardees, including HDR Environmental, Operations and Construction, Inc. and HDR Engineering, Inc. Top agencies Navy (Department of the Navy) DOT (Department of Transportation)	$13,995,557	0.7%	Rank history: #45 in FY2022, #49 in FY2023, #25 in FY2024 and #24 in FY2025; up 15 since FY2020.
30	International Business Machines Corporation 2 awardees Top agencies HHS (Department of Health and Human Services)	$13,800,665	0.7%	Rank history: not on the FY2022–FY2025 lists; up 40 since FY2020.
31	Science Applications International Corporation 3 awardees Top agencies DOT (Department of Transportation)	$13,125,493	0.6%	Rank history: #42 in FY2022, #46 in FY2023, #60 in FY2024 and #39 in FY2025; new, not ranked in FY2020.
32	Health Services Holdings Inc. Through Health Services Advisory Group, Inc. Top agencies HHS (Department of Health and Human Services)	$12,972,322	0.6%	Rank history: #43 in FY2022, #31 in FY2023, #65 in FY2024 and not on the FY2025 list; up 16 since FY2020.
33	Battelle Memorial Institute Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$12,905,680	0.6%	Rank history: #31 in FY2022, #40 in FY2023, #32 in FY2024 and #26 in FY2025; up 16 since FY2020.
34	Olgoonik Corporation Through Olgoonik Solutions LLC Top agencies DOS (Department of State) OSD (Office of the Secretary of Defense)	$12,556,271	0.6%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
35	Global Engineering & Technology Inc. Top agencies DOE (Department of Energy)	$12,317,468	0.6%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
36	SRA International Inc. Through General Dynamics Information Technology, Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$11,773,522	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
37	The Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies HHS (Department of Health and Human Services) DOS (Department of State)	$11,622,214	0.6%	Rank history: #50 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; up 71 since FY2020.
38	Creative Associates International, Inc. Top agencies USAID (US Agency for International Development)	$10,467,181	0.5%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; up 30 since FY2020.
39	RMC 2021 LLC Top agencies Navy (Department of the Navy)	$9,895,368	0.5%	Rank history: #11 in FY2022, #15 in FY2023, #28 in FY2024 and #19 in FY2025; down 8 since FY2020.
40	Eagle Global Scientific, LLC Top agencies HHS (Department of Health and Human Services)	$9,890,784	0.5%	Rank history: #36 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
41	ABT Global LLC 2 awardees Top agencies HHS (Department of Health and Human Services)	$9,768,160	0.5%	Rank history: #27 in FY2022, #55 in FY2023, #39 in FY2024 and not on the FY2025 list; up 18 since FY2020.
42	Cherokee Nation 2 awardees, including Cherokee Nation Strategic Programs, L.L.C. Top agencies DTRA (Defense Threat Reduction Agency) Commerce (Department of Commerce) Treasury (Department of the Treasury)	$9,224,052	0.4%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; down 20 since FY2020.
43	Sealaska Corporation Through Managed Business Solutions LLC Top agencies DOI (Department of the Interior)	$9,218,254	0.4%	Rank history: #57 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 55 since FY2020.
44	Northrop Grumman Corporation 2 awardees, including Orbital Sciences LLC and Northrop Grumman Systems Corporation Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$9,029,689	0.4%	Rank history: #70 in FY2022, not on the FY2023 list, #69 in FY2024 and not on the FY2025 list; up 9 since FY2020.
45	Ripple Effect Communications, Inc. Top agencies DHA (Defense Health Agency) Navy (Department of the Navy) Army (Department of the Army)	$8,894,307	0.4%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
46	Fintrac Inc. Top agencies USAID (US Agency for International Development)	$8,561,306	0.4%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
47	Space Systems/Loral LLC Through Radiant Analytic Solutions, Inc. Top agencies USSOCOM (United States Special Operations Command)	$8,525,378	0.4%	Rank history: #40 in FY2022, #37 in FY2023, #70 in FY2024 and not on the FY2025 list; up 10 since FY2020.
48	ECS Federal, LLC Top agencies DOJ (Department of Justice) DARPA (Defense Advanced Research Projects Agency)	$8,519,133	0.4%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
49	X Corp Solutions Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$8,254,375	0.4%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
50	NOU Systems Inc. Top agencies MDA (DOD Missile Defense Agency)	$8,077,686	0.4%	Rank history: not on the FY2022–FY2025 lists; up 31 since FY2020.
51	Strativia LLC Top agencies Commerce (Department of Commerce) Army (Department of the Army) DOJ (Department of Justice)	$7,869,827	0.4%	Rank history: #52 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
52	Serco North America (Holdings) Inc 2 awardees, including Serco Inc. and Whitney Bradley & Brown, Inc. Top agencies Navy (Department of the Navy)	$7,769,021	0.4%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
53	W R Systems Ltd. Top agencies Navy (Department of the Navy)	$7,383,317	0.4%	Rank history: not on the FY2022–FY2023 lists, #58 in FY2024 and #79 in FY2025; up 26 since FY2020.
54	Kikiktagruk Inupiat Corp Through Midnight Sun Technologies LLC Top agencies HHS (Department of Health and Human Services)	$7,236,754	0.3%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
55	Swmg Productions Inc. Top agencies Army (Department of the Army)	$7,215,335	0.3%	Rank history: #55 in FY2022, not on the FY2023 list, #74 in FY2024 and #49 in FY2025; up 12 since FY2020.
56	Chinook Systems Inc. Top agencies WHS (DOD Washington Headquarters Service) GSA (General Services Administration) VA (Department of Veterans Affairs)	$7,209,511	0.3%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; up 317 since FY2020.
57	Axle Informatics, LLC Top agencies HHS (Department of Health and Human Services)	$6,906,347	0.3%	Rank history: #13 in FY2022, #9 in FY2023, #11 in FY2024 and #12 in FY2025; new, not ranked in FY2020.
58	Foundation for Atlanta Veterans Education and Research, Inc. Top agencies HHS (Department of Health and Human Services)	$6,445,149	0.3%	Rank history: not on the FY2022–FY2025 lists; up 71 since FY2020.
59	Noblis, Inc. Top agencies Army (Department of the Army)	$6,395,322	0.3%	Rank history: #30 in FY2022, #41 in FY2023, #36 in FY2024 and #38 in FY2025; up 10 since FY2020.
60	CCS Associates, Inc. Top agencies HHS (Department of Health and Human Services)	$6,094,233	0.3%	Rank history: #82 in FY2022, #89 in FY2023, #80 in FY2024 and #81 in FY2025; up 25 since FY2020.
61	K2 Group, Inc. Top agencies DTRA (Defense Threat Reduction Agency)	$6,065,749	0.3%	Rank history: #64 in FY2022, not on the FY2023 list, #59 in FY2024 and #42 in FY2025; up 16 since FY2020.
62	Nana Regional Corporation Inc 2 awardees, including Tuva LLC and Tuvli LLC Top agencies DOE (Department of Energy) DTRA (Defense Threat Reduction Agency) HHS (Department of Health and Human Services)	$5,920,563	0.3%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 60 since FY2020.
63	International Consulting Associates, Inc. Top agencies HHS (Department of Health and Human Services)	$5,813,043	0.3%	Rank history: not on the FY2022–FY2025 lists; up 33 since FY2020.
64	National Opinion Research Center Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services)	$5,802,610	0.3%	Rank history: not on the FY2022 list, #32 in FY2023, #50 in FY2024 and #37 in FY2025; down 13 since FY2020.
65	Lynker Corporation Top agencies Commerce (Department of Commerce)	$5,683,614	0.3%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
66	Strategic Analysis, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency)	$5,611,541	0.3%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
67	Technology Security Associates, Inc. Top agencies Navy (Department of the Navy)	$5,568,704	0.3%	Rank history: #60 in FY2022, #64 in FY2023, #43 in FY2024 and #52 in FY2025; new, not ranked in FY2020.
68	Vernadero Group Inc. Top agencies Navy (Department of the Navy)	$5,556,520	0.3%	Rank history: not on the FY2022 list, #71 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
69	Kegman Inc. Top agencies USAF (Department of the Air Force)	$5,458,118	0.3%	Rank history: #54 in FY2022, #35 in FY2023, #34 in FY2024 and #27 in FY2025; up 26 since FY2020.
70	Kennell & Associates Inc. Top agencies DHA (Defense Health Agency)	$5,418,025	0.3%	Rank history: #75 in FY2022, #69 in FY2023, #67 in FY2024 and #54 in FY2025; up 27 since FY2020.
71	University of Oxford Top agencies DTRA (Defense Threat Reduction Agency)	$5,239,911	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Bering Straits Native Corporation Through Bering Global Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$5,229,936	0.2%	Rank history: #86 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
73	SAP America Inc Through Sap National Security Services Inc. Top agencies Army (Department of the Army)	$5,107,649	0.2%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
74	Identification Technology Partners Inc. Top agencies DHS (Department of Homeland Security)	$5,085,887	0.2%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
75	Akima Systems Engineering LLC Top agencies DOI (Department of the Interior)	$5,010,470	0.2%	Rank history: #87 in FY2022, #88 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
76	UEI F1D1GLREXKW5 Top agencies Navy (Department of the Navy) Army (Department of the Army)	$4,885,914	0.2%	Rank history: #94 in FY2022, #93 in FY2023, #98 in FY2024 and #94 in FY2025; down 29 since FY2020.
77	Olgoonik Worldwide Services LLC Top agencies USAID (US Agency for International Development)	$4,831,921	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Comsetra LLC Top agencies USAF (Department of the Air Force)	$4,794,012	0.2%	Rank history: not on the FY2022–FY2024 lists and #83 in FY2025; new, not ranked in FY2020.
79	Systex, Inc. Top agencies HHS (Department of Health and Human Services)	$4,751,591	0.2%	Rank history: #89 in FY2022, #79 in FY2023, #82 in FY2024 and #65 in FY2025; up 9 since FY2020.
80	Goldbelt Frontier, LLC Top agencies Army (Department of the Army)	$4,749,669	0.2%	Rank history: #96 in FY2022, not on the FY2023–FY2024 lists and #82 in FY2025; up 260 since FY2020.
81	The Building People LLC Top agencies DOE (Department of Energy)	$4,565,222	0.2%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
82	Bmnt Inc. Top agencies Navy (Department of the Navy)	$4,529,375	0.2%	Rank history: #71 in FY2022, #100 in FY2023, #72 in FY2024 and not on the FY2025 list; down 32 since FY2020.
83	A.i.s., Inc. Top agencies Commerce (Department of Commerce)	$4,517,309	0.2%	Rank history: not on the FY2022–FY2023 lists, #99 in FY2024 and #56 in FY2025; down 23 since FY2020.
84	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$4,501,591	0.2%	Rank history: #17 in FY2022, #5 in FY2023, #5 in FY2024 and #9 in FY2025; new, not ranked in FY2020.
85	Goldbelt, Incorporated Through Goldbelt C6, LLC Top agencies HHS (Department of Health and Human Services)	$4,467,173	0.2%	Rank history: #69 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
86	Deloitte Consulting LLP Top agencies USAID (US Agency for International Development)	$4,449,900	0.2%	Rank history: not on the FY2022 list, #54 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
87	Mission Technology Top agencies NASA (National Aeronautics and Space Administration)	$4,262,390	0.2%	Rank history: not on the FY2022–FY2024 lists and #84 in FY2025; up 84 since FY2020.
88	Training Technologies and Support, Inc. Top agencies Army (Department of the Army)	$4,234,626	0.2%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
89	Tactica Management Services LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$4,112,147	0.2%	Rank history: #97 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
90	Mriglobal Top agencies HHS (Department of Health and Human Services)	$4,086,125	0.2%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
91	Tanaq Support Services, LLC Top agencies HHS (Department of Health and Human Services)	$3,935,917	0.2%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; up 172 since FY2020.
92	Gulf South Research Corp Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,861,295	0.2%	Rank history: not on the FY2022–FY2025 lists; up 57 since FY2020.
93	Regents of the University of Michigan Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) NRC (Nuclear Regulatory Commission)	$3,819,423	0.2%	Rank history: #98 in FY2022, #72 in FY2023, #95 in FY2024 and #99 in FY2025; up 1 since FY2020.
94	Quantics Incorporated Top agencies Navy (Department of the Navy)	$3,531,414	0.2%	Rank history: not on the FY2022–FY2025 lists; up 37 since FY2020.
95	American Institutes for Research In the Behavioral Sciences 2 awardees, including Impaq International, LLC Top agencies HHS (Department of Health and Human Services) MCC (Millennium Challenge Corporation)	$3,307,710	0.2%	Rank history: #78 in FY2022, #70 in FY2023, #52 in FY2024 and #47 in FY2025; up 221 since FY2020.
96	ACS Habitat Management, Inc. Top agencies Navy (Department of the Navy)	$3,232,963	0.2%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
97	Katmai Integrated Solutions, LLC Top agencies Navy (Department of the Navy)	$3,231,516	0.2%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
98	Broadleaf, Inc. Top agencies Army (Department of the Army) CFTC (Commodity Futures Trading Commission)	$3,154,298	0.2%	Rank history: not on the FY2022–FY2025 lists; up 322 since FY2020.
99	Kmea Through Patriot Joint Venture Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$3,117,053	0.1%	Rank history: not on the FY2022–FY2025 lists; down 38 since FY2020.
100	Eastern Research Group Inc. Top agencies HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$3,101,788	0.1%	Rank history: not on the FY2022–FY2025 lists; up 69 since FY2020.

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100 of 1,266 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 54169

Code	Net obligations	Largest contractor
541690 Other Scientific and Technical Consulting Services	$1,910,533,167	Ingenesis 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 $2.1 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 54169 contractors in FY2021?

1. Ingenesis Inc. ($227M), 2. Lockheed Martin Corporation ($120M), 3. Booz Allen Hamilton Holding Corporation ($66.2M), 4. Mantech International Corporation ($53.5M), 5. Leidos Holdings, Inc. ($50.2M), 6. General Dynamics Corporation ($43.1M), 7. Michael Stapleton Associates, Ltd. ($40.5M), 8. Linquest Corporation ($37.9M), 9. National Academy of Sciences ($35.7M), 10. Unwin Co ($33.7M).

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