Top 100 Contractors in NAICS 5411: Legal Services, FY2021

Name: Top 100 Contractors in NAICS 5411: Legal Services, FY2021
Creator: GovTribe

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

The top 10 won 64% of FY2021 NAICS 5411 contract dollars

Contract obligations: $724,980,109 Net of deobligations, by contracts coded NAICS 5411 or a code under it
Contractors: 1,057 Parent companies with an obligation
Largest contractor: Vera Institute of Justice, Inc. $159 million, 19.1% 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	Vera Institute of Justice, Inc. Top agencies HHS (Department of Health and Human Services)	$159,021,182	19.1%	Rank history: #1 in FY2022, #1 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
2	Science Applications International Corporation 3 awardees, including Forfeiture Support Associates LLC Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security) USDA (Department of Agriculture)	$132,204,732	15.9%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; up 2 since FY2020.
3	CACI International Inc. 3 awardees, including Caci, LLC - Commercial Top agencies DOJ (Department of Justice)	$70,897,710	8.5%	Rank history: #13 in FY2022, #4 in FY2023, #12 in FY2024 and #3 in FY2025; unchanged since FY2020.
4	Altegrity, Inc. Through PAE Labat-Anderson LLC Top agencies DOJ (Department of Justice)	$51,188,742	6.2%	Rank history: #3 in FY2022, #5 in FY2023, #30 in FY2024 and not on the FY2025 list; up 2 since FY2020.
5	Leidos Holdings, Inc. 3 awardees, including Leidos, Inc. Top agencies DOJ (Department of Justice) USAF (Department of the Air Force)	$33,056,061	4.0%	Rank history: #8 in FY2022, #9 in FY2023, #6 in FY2024 and #5 in FY2025; up 3 since FY2020.
6	Deloitte LLP 2 awardees, including Deloitte Financial Advisory Services LLP Top agencies DOJ (Department of Justice) Navy (Department of the Navy)	$32,188,603	3.9%	Rank history: #7 in FY2022, #7 in FY2023, #5 in FY2024 and #6 in FY2025; up 10 since FY2020.
7	VSE Corporation Top agencies DOJ (Department of Justice)	$18,633,383	2.2%	Rank history: #6 in FY2022, not on the FY2023 list, #18 in FY2024 and #17 in FY2025; up 3 since FY2020.
8	Sullivan & Cromwell LLP Top agencies Treasury (Department of the Treasury)	$11,300,000	1.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
9	IEM International, Inc. Top agencies SBA (Small Business Administration)	$10,920,887	1.3%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
10	Davis Polk & Wardwell LLP Top agencies Treasury (Department of the Treasury)	$10,500,000	1.3%	Rank history: not on the FY2022–FY2025 lists; up 91 since FY2020.
11	Infoedge Technology, Inc. Top agencies DOS (Department of State)	$9,250,000	1.1%	Rank history: #14 in FY2022, #20 in FY2023, #13 in FY2024 and #25 in FY2025; up 7 since FY2020.
12	Analysis Group Inc. Top agencies DOJ (Department of Justice) CFPB (Consumer Financial Protection Bureau) Treasury (Department of the Treasury)	$7,613,096	0.9%	Rank history: #11 in FY2022, #15 in FY2023, #14 in FY2024 and #12 in FY2025; up 37 since FY2020.
13	Leydig, Voit & Mayer, Ltd. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$7,168,062	0.9%	Rank history: #16 in FY2022, #18 in FY2023, #25 in FY2024 and #15 in FY2025; up 19 since FY2020.
14	John J. YIM & Associates, LLC Top agencies HHS (Department of Health and Human Services) ED (Department of Education) DHS (Department of Homeland Security)	$6,433,875	0.8%	Rank history: #10 in FY2022, #11 in FY2023, #7 in FY2024 and #9 in FY2025; up 1 since FY2020.
15	Lifecare, Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) NSF (National Science Foundation)	$5,915,852	0.7%	Rank history: #15 in FY2022, #12 in FY2023, #9 in FY2024 and not on the FY2025 list; up 5 since FY2020.
16	Caci, LLC - Commercial Top agencies DOJ (Department of Justice)	$5,704,657	0.7%	Rank history: #4 in FY2022, #21 in FY2023, #3 in FY2024 and not on the FY2025 list; up 22 since FY2020.
17	Forfeiture Support Associates LLC Top agencies DOJ (Department of Justice)	$5,433,122	0.7%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
18	Klarquist Sparkman, LLP Top agencies HHS (Department of Health and Human Services)	$5,340,456	0.6%	Rank history: #26 in FY2022, #26 in FY2023, #35 in FY2024 and #18 in FY2025; up 11 since FY2020.
19	Gordian Litigation Solutions Group, Inc. Top agencies USAF (Department of the Air Force)	$4,964,974	0.6%	Rank history: #20 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
20	Historical Research Associates, Inc. Top agencies DOJ (Department of Justice)	$4,173,829	0.5%	Rank history: not on the FY2022–FY2023 lists, #82 in FY2024 and #91 in FY2025; up 96 since FY2020.
21	Morgan, Angel, Brigham & Associates L.L.C. Top agencies DOJ (Department of Justice)	$3,309,929	0.4%	Rank history: #24 in FY2022, #31 in FY2023, #29 in FY2024 and #22 in FY2025; down 7 since FY2020.
22	Wolf Water Resources Inc. Top agencies DOJ (Department of Justice)	$3,289,171	0.4%	Rank history: #68 in FY2022, #74 in FY2023 and not on the FY2024–FY2025 lists; up 83 since FY2020.
23	Industrial Economics Inc. Top agencies DOJ (Department of Justice)	$3,264,611	0.4%	Rank history: #36 in FY2022, #22 in FY2023, #34 in FY2024 and #68 in FY2025; up 25 since FY2020.
24	Aleknagik Natives Limited Through Aleknagik Technology, LLC Top agencies DOJ (Department of Justice)	$2,946,116	0.4%	Rank history: #27 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
25	Stout Risius Ross, LLC Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services)	$2,881,943	0.3%	Rank history: #22 in FY2022, #29 in FY2023, #69 in FY2024 and #29 in FY2025; up 52 since FY2020.
26	Litcon Group LLC Top agencies DOJ (Department of Justice) DOS (Department of State)	$2,845,677	0.3%	Rank history: #29 in FY2022, #25 in FY2023, #65 in FY2024 and #61 in FY2025; down 3 since FY2020.
27	Cyphersix, LLC Top agencies DOJ (Department of Justice)	$2,700,000	0.3%	Rank history: not on the FY2022–FY2023 lists, #91 in FY2024 and not on the FY2025 list; up 45 since FY2020.
28	Knobbe, Martens, Olson & Bear, LLP Top agencies HHS (Department of Health and Human Services)	$2,425,000	0.3%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
29	Varella & Advogados Associados Top agencies EXIM (Export Import Bank of the US)	$2,181,041	0.3%	Rank history: not on the FY2022–FY2024 lists and #60 in FY2025; up 51 since FY2020.
30	The Austin Group LLC Top agencies DOJ (Department of Justice)	$2,142,543	0.3%	Rank history: #38 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
31	Cardno Emerging Markets USA Ltd. 2 awardees, including Cardno, Inc. Top agencies DOJ (Department of Justice)	$2,079,074	0.2%	Rank history: not on the FY2022–FY2025 lists; up 30 since FY2020.
32	Document Technologies, LLC 2 awardees, including Garden City Group, LLC and Settlement Services, Inc. Top agencies DOJ (Department of Justice) EEOC (Equal Employment Opportunity Commission)	$1,869,603	0.2%	Rank history: not on the FY2022 list, #30 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
33	Computershare Inc. Through Gilardi & Co., LLC Top agencies DOJ (Department of Justice)	$1,765,451	0.2%	Rank history: #55 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
34	Norton Rose Fulbright US LLP 2 awardees Top agencies DOE (Department of Energy) DFC (International Development Finance Corporation)	$1,625,489	0.2%	Rank history: not on the FY2022 list, #28 in FY2023, #39 in FY2024 and #38 in FY2025; up 247 since FY2020.
35	Court House Research Specialists, Inc. Top agencies Army (Department of the Army)	$1,570,211	0.2%	Rank history: not on the FY2022–FY2024 lists and #35 in FY2025; up 18 since FY2020.
36	Myers and Stauffer LC Top agencies DOJ (Department of Justice)	$1,557,171	0.2%	Rank history: not on the FY2022 list, #81 in FY2023, #68 in FY2024 and #92 in FY2025; up 19 since FY2020.
37	Proxy Personnel LLC Top agencies EOP (Executive Office of the President)	$1,537,175	0.2%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; up 47 since FY2020.
38	Secretariat Economists LLC Top agencies DOJ (Department of Justice)	$1,490,433	0.2%	Rank history: #46 in FY2022, #37 in FY2023, #48 in FY2024 and not on the FY2025 list; down 14 since FY2020.
39	Alvarez & Marsal Holdings LLC Through Alvarez & Marsal Disputes and Investigations, LLC Top agencies DOJ (Department of Justice)	$1,487,605	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	Wilmer Cutler Pickering Hale and Dorr LLP Top agencies DOJ (Department of Justice)	$1,425,000	0.2%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
41	Allen & Overy LLP Top agencies EXIM (Export Import Bank of the US) DOE (Department of Energy)	$1,414,748	0.2%	Rank history: #23 in FY2022, #23 in FY2023, #42 in FY2024 and not on the FY2025 list; up 24 since FY2020.
42	Capital Project Management, Inc. Top agencies DOJ (Department of Justice) VA (Department of Veterans Affairs)	$1,404,379	0.2%	Rank history: not on the FY2022 list, #78 in FY2023, not on the FY2024 list and #100 in FY2025; up 71 since FY2020.
43	Justice In Aging Top agencies HHS (Department of Health and Human Services)	$1,398,044	0.2%	Rank history: #41 in FY2022, #49 in FY2023, #54 in FY2024 and #39 in FY2025; up 7 since FY2020.
44	Beacon Group, LLC Top agencies DOJ (Department of Justice) DOT (Department of Transportation)	$1,378,597	0.2%	Rank history: #42 in FY2022, #27 in FY2023, #77 in FY2024 and not on the FY2025 list; down 16 since FY2020.
45	Womble Bond Dickinson US LLP Top agencies DFC (International Development Finance Corporation)	$1,361,304	0.2%	Rank history: #52 in FY2022, #38 in FY2023 and not on the FY2024–FY2025 lists; up 115 since FY2020.
46	Natural Resources Consulting Engineers, Inc. Top agencies DOJ (Department of Justice)	$1,351,172	0.2%	Rank history: #91 in FY2022, #61 in FY2023, #45 in FY2024 and #65 in FY2025; up 30 since FY2020.
47	Global Patent Solutions, L.L.C. Top agencies Commerce (Department of Commerce)	$1,313,689	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
48	ABZ Inc. Top agencies DOJ (Department of Justice)	$1,233,659	0.1%	Rank history: #28 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
49	Berkeley Research Group, LLC Top agencies DOJ (Department of Justice)	$1,155,817	0.1%	Rank history: #70 in FY2022, #16 in FY2023, #19 in FY2024 and #40 in FY2025; up 96 since FY2020.
50	Cleary Gottlieb Steen & Hamilton LLP Top agencies Treasury (Department of the Treasury)	$1,150,000	0.1%	Rank history: not on the FY2022–FY2025 lists; down 39 since FY2020.
51	Kingstonville, LLC Top agencies DOJ (Department of Justice)	$1,059,378	0.1%	Rank history: #45 in FY2022, #46 in FY2023, #75 in FY2024 and #49 in FY2025; up 42 since FY2020.
52	Ocean Tomo, LLC Through Veris Consulting, LLC Top agencies DOJ (Department of Justice)	$1,045,411	0.1%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
53	Shearman & Sterling LLP Top agencies DOT (Department of Transportation) DOE (Department of Energy)	$1,025,200	0.1%	Rank history: #77 in FY2022, #94 in FY2023, #26 in FY2024 and not on the FY2025 list; up 11 since FY2020.
54	Centre Law and Consulting, LLC Top agencies DOJ (Department of Justice)	$1,004,874	0.1%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; up 20 since FY2020.
55	Smith Gambrell & Russell LLP Top agencies EXIM (Export Import Bank of the US)	$1,000,000	0.1%	Rank history: #51 in FY2022 and not on the FY2023–FY2025 lists; up 69 since FY2020.
56	Robert Wray PLLC Top agencies EXIM (Export Import Bank of the US)	$1,000,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 82 since FY2020.
57	Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. Top agencies HHS (Department of Health and Human Services)	$985,899	0.1%	Rank history: not on the FY2022–FY2023 lists, #74 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
58	Wright Water Engineers, Inc. Top agencies DOJ (Department of Justice)	$985,263	0.1%	Rank history: not on the FY2022 list, #50 in FY2023, #55 in FY2024 and #44 in FY2025; up 100 since FY2020.
59	Ankura Holdings, LP Through Ankura Consulting Group, LLC Top agencies DOE (Department of Energy) DOJ (Department of Justice)	$984,020	0.1%	Rank history: not on the FY2022–FY2023 lists, #36 in FY2024 and not on the FY2025 list; up 56 since FY2020.
60	CRA International, Inc. Top agencies CFPB (Consumer Financial Protection Bureau) Treasury (Department of the Treasury) DOJ (Department of Justice)	$981,337	0.1%	Rank history: #18 in FY2022, #69 in FY2023, #83 in FY2024 and not on the FY2025 list; unchanged since FY2020.
61	Paul Hastings LLP Top agencies DOT (Department of Transportation) GAO (Government Accountability Office)	$960,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Convergent Solutions Inc. Top agencies DOJ (Department of Justice)	$932,756	0.1%	Rank history: not on the FY2022–FY2025 lists; up 89 since FY2020.
63	Polsinelli PC Top agencies HHS (Department of Health and Human Services)	$900,286	0.1%	Rank history: #60 in FY2022, not on the FY2023–FY2024 lists and #43 in FY2025; up 106 since FY2020.
64	Morrison & Foerster LLP Top agencies DFC (International Development Finance Corporation)	$900,000	0.1%	Rank history: #21 in FY2022, #32 in FY2023, #32 in FY2024 and #14 in FY2025; new, not ranked in FY2020.
65	Evans Water Resources Engineering PLLC Top agencies DOJ (Department of Justice)	$888,027	0.1%	Rank history: #73 in FY2022, not on the FY2023–FY2024 lists and #99 in FY2025; new, not ranked in FY2020.
66	Veris Consulting, LLC Top agencies DOJ (Department of Justice)	$878,918	0.1%	Rank history: not on the FY2022–FY2025 lists; down 29 since FY2020.
67	Fortuno & Fortuno Fas CSP Top agencies USDA (Department of Agriculture) DOJ (Department of Justice)	$853,733	0.1%	Rank history: not on the FY2022–FY2025 lists; up 293 since FY2020.
68	Chelsea-Village Medical Office, P.C. Top agencies DOJ (Department of Justice)	$841,319	0.1%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
69	Leidos, Inc. Top agencies DOJ (Department of Justice)	$810,941	0.1%	Rank history: not on the FY2022–FY2025 lists; down 60 since FY2020.
70	Koniag, Inc. 2 awardees, including Kadiak LLC and Pacarctic, LLC Top agencies DOI (Department of the Interior) Army (Department of the Army)	$790,457	0.1%	Rank history: not on the FY2022 list, #95 in FY2023, not on the FY2024 list and #74 in FY2025; unchanged since FY2020.
71	Mcdonnell Boehnen Hulbert & Berghoff LLP Top agencies HHS (Department of Health and Human Services)	$780,045	0.1%	Rank history: #66 in FY2022, #77 in FY2023, not on the FY2024 list and #59 in FY2025; new, not ranked in FY2020.
72	Exponent Inc. 2 awardees Top agencies DOJ (Department of Justice)	$769,035	0.1%	Rank history: not on the FY2022 list, #42 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
73	Grant Thornton International Ltd 2 awardees, including Grant Thornton Public Sector LLC Top agencies DOS (Department of State)	$768,098	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Geosyntec Consultants, Inc. Top agencies DOJ (Department of Justice)	$747,114	0.1%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
75	The Gilchrist Law Firm, P.a. Top agencies DOL (Department of Labor) USDA (Department of Agriculture) VA (Department of Veterans Affairs)	$746,634	0.1%	Rank history: #62 in FY2022, #17 in FY2023, #63 in FY2024 and #82 in FY2025; up 34 since FY2020.
76	B&B Solutions US LLC Top agencies USDA (Department of Agriculture)	$732,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	Siltek, Inc. Top agencies HHS (Department of Health and Human Services)	$724,246	0.1%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
78	Mcbee Moore & Vanik IP, LLC Top agencies HHS (Department of Health and Human Services)	$710,951	0.1%	Rank history: #58 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
79	Stoneturn Group LLP Top agencies DOJ (Department of Justice)	$699,864	0.1%	Rank history: not on the FY2022–FY2025 lists; up 33 since FY2020.
80	Nixon Peabody, LLP Top agencies DOT (Department of Transportation) DFC (International Development Finance Corporation)	$661,125	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Deloitte Financial Advisory Services LLP Top agencies DOJ (Department of Justice)	$647,376	0.1%	Rank history: not on the FY2022–FY2025 lists; down 42 since FY2020.
82	Mclane Environmental, LLC Top agencies DOJ (Department of Justice)	$642,608	0.1%	Rank history: not on the FY2022–FY2025 lists; up 85 since FY2020.
83	Ernst & Young LLP 2 awardees Top agencies DOJ (Department of Justice)	$616,785	0.1%	Rank history: not on the FY2022–FY2025 lists; up 95 since FY2020.
84	Chess Consulting LLC Top agencies DOJ (Department of Justice)	$592,912	0.1%	Rank history: not on the FY2022 list, #86 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
85	Hunton Andrews Kurth LLP Top agencies MCC (Millennium Challenge Corporation)	$571,276	0.1%	Rank history: #17 in FY2022, #8 in FY2023, #22 in FY2024 and not on the FY2025 list; down 49 since FY2020.
86	IA Group B.V. Top agencies EXIM (Export Import Bank of the US)	$553,441	0.1%	Rank history: #53 in FY2022, #100 in FY2023, not on the FY2024 list and #69 in FY2025; up 58 since FY2020.
87	DLA Piper UK LLP Through DLA Piper LLP (Us) Top agencies DFC (International Development Finance Corporation)	$550,365	0.1%	Rank history: not on the FY2022–FY2025 lists; down 40 since FY2020.
88	Arthur Cox Top agencies DOS (Department of State)	$538,319	0.1%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
89	Crb-Pls, LLC Top agencies Army (Department of the Army)	$532,285	0.1%	Rank history: not on the FY2022 list, #60 in FY2023, not on the FY2024 list and #19 in FY2025; down 62 since FY2020.
90	Gradco LLC Top agencies DOJ (Department of Justice)	$532,155	0.1%	Rank history: #71 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; up 31 since FY2020.
91	RMI Valuation LLC Top agencies DOJ (Department of Justice)	$518,286	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	J.s. Held LLC Top agencies DOJ (Department of Justice)	$505,395	0.1%	Rank history: #30 in FY2022, #47 in FY2023, not on the FY2024 list and #89 in FY2025; new, not ranked in FY2020.
93	Molo Lamken LLP Top agencies DOE (Department of Energy)	$500,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 112 since FY2020.
94	Attainx Inc. 2 awardees Top agencies USDA (Department of Agriculture)	$497,685	0.1%	Rank history: not on the FY2022–FY2025 lists; down 35 since FY2020.
95	Clifford Chance Rogers & Wells LLP Through Clifford Chance US LLP Top agencies DFC (International Development Finance Corporation) DOE (Department of Energy)	$490,160	0.1%	Rank history: not on the FY2022 list, #64 in FY2023, #81 in FY2024 and not on the FY2025 list; down 54 since FY2020.
96	Cantor Colburn LLP Top agencies HHS (Department of Health and Human Services)	$489,523	0.1%	Rank history: not on the FY2022–FY2025 lists; up 51 since FY2020.
97	The Kimley-Horn Group Inc 2 awardees, including Kimley-Horn and Associates, Inc. Top agencies USTDA (United States Trade and Development Agency) DOJ (Department of Justice)	$482,580	0.1%	Rank history: #93 in FY2022, not on the FY2023 list, #78 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
98	Thompson Coburn LLP Top agencies EXIM (Export Import Bank of the US)	$475,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	American Medical Experts, LLC Top agencies DOJ (Department of Justice)	$465,979	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Information Systems & Networks Corporation Top agencies DOJ (Department of Justice)	$465,383	0.1%	Rank history: not on the FY2022–FY2025 lists; down 42 since FY2020.

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100 of 1,057 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 5411

Code	Net obligations	Largest contractor
54119 Other Legal Services	$499,891,949	Science Applications International Corporation
54111 Offices of Lawyers	$224,842,746	Vera Institute of Justice, 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 $832 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 NAICS 5411 contractors in FY2021?

1. Vera Institute of Justice, Inc. ($159M), 2. Science Applications International Corporation ($132M), 3. CACI International Inc. ($70.9M), 4. Altegrity, Inc. ($51.2M), 5. Leidos Holdings, Inc. ($33.1M), 6. Deloitte LLP ($32.2M), 7. VSE Corporation ($18.6M), 8. Sullivan & Cromwell LLP ($11.3M), 9. IEM International, Inc. ($10.9M), 10. Davis Polk & Wardwell LLP ($10.5M).

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