Top 100 Contractors in PSC R424: Expert Witness, FY2021

Name: Top 100 Contractors in PSC R424: Expert Witness, FY2021
Creator: GovTribe

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

The top 10 won 41% of FY2021 PSC R424 contract dollars

Contract obligations: $273,253,535 Net of deobligations, by contracts coded PSC R424
Contractors: 943 Parent companies with an obligation
Largest contractor: Georgia TECH Research Corp $49.5 million, 15.4% 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	Georgia TECH Research Corp Through Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force)	$49,525,374	15.4%	Rank history: #1 in FY2022, #1 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
2	Analysis Group Inc. Top agencies DOJ (Department of Justice) Treasury (Department of the Treasury) FTC (Federal Trade Commission)	$17,282,063	5.4%	Rank history: #2 in FY2022, #7 in FY2023, #4 in FY2024 and #6 in FY2025; up 1 since FY2020.
3	Cornerstone Research Inc. Top agencies Treasury (Department of the Treasury) SEC (Securities and Exchange Commission) FTC (Federal Trade Commission)	$11,931,042	3.7%	Rank history: #7 in FY2022, #3 in FY2023, #3 in FY2024 and #14 in FY2025; down 1 since FY2020.
4	CRA International, Inc. Top agencies FTC (Federal Trade Commission) Treasury (Department of the Treasury) DOJ (Department of Justice)	$11,369,242	3.5%	Rank history: #6 in FY2022, #2 in FY2023, #7 in FY2024 and #20 in FY2025; unchanged since FY2020.
5	HKA Global LLC 2 awardees, including The Kenrich Group, LLC Top agencies Army (Department of the Army)	$10,970,206	3.4%	Rank history: #4 in FY2022, #4 in FY2023, not on the FY2024 list and #46 in FY2025; up 37 since FY2020.
6	The Brattle Group Inc. Top agencies DOJ (Department of Justice) SEC (Securities and Exchange Commission) FTC (Federal Trade Commission)	$9,017,512	2.8%	Rank history: #3 in FY2022, #5 in FY2023, #5 in FY2024 and #3 in FY2025; down 1 since FY2020.
7	FTI Consulting, Inc. 2 awardees, including Compass Lexecon LLC Top agencies DOJ (Department of Justice) SEC (Securities and Exchange Commission) FTC (Federal Trade Commission)	$6,533,987	2.0%	Rank history: #11 in FY2022, #9 in FY2023, #6 in FY2024 and #5 in FY2025; down 1 since FY2020.
8	Bates White, LLC Top agencies FTC (Federal Trade Commission) Treasury (Department of the Treasury) DOJ (Department of Justice)	$5,603,650	1.7%	Rank history: #5 in FY2022, #6 in FY2023, #2 in FY2024 and #2 in FY2025; down 1 since FY2020.
9	Gordian Litigation Solutions Group, Inc. Top agencies USAF (Department of the Air Force)	$4,964,974	1.5%	Rank history: #15 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
10	Historical Research Associates, Inc. Top agencies DOJ (Department of Justice)	$4,222,203	1.3%	Rank history: not on the FY2022–FY2023 lists, #62 in FY2024 and #69 in FY2025; up 70 since FY2020.
11	Litcon Group LLC Top agencies DOJ (Department of Justice) Navy (Department of the Navy) Army (Department of the Army)	$4,029,639	1.3%	Rank history: #18 in FY2022, #20 in FY2023, #14 in FY2024 and #21 in FY2025; down 1 since FY2020.
12	Veris Consulting, LLC Top agencies Navy (Department of the Navy) DOJ (Department of Justice) SEC (Securities and Exchange Commission)	$3,879,634	1.2%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
13	Morgan, Angel, Brigham & Associates L.L.C. Top agencies DOJ (Department of Justice)	$3,824,590	1.2%	Rank history: #14 in FY2022, #21 in FY2023, #16 in FY2024 and #9 in FY2025; down 5 since FY2020.
14	Industrial Economics Inc. Top agencies DOJ (Department of Justice)	$3,614,204	1.1%	Rank history: #24 in FY2022, #12 in FY2023, #21 in FY2024 and #42 in FY2025; up 12 since FY2020.
15	RON Barone Financial Consulting, LLC Top agencies Treasury (Department of the Treasury)	$3,537,047	1.1%	Rank history: not on the FY2022–FY2025 lists; up 31 since FY2020.
16	Wolf Water Resources Inc. Top agencies DOJ (Department of Justice)	$3,289,171	1.0%	Rank history: #49 in FY2022, #61 in FY2023, #89 in FY2024 and not on the FY2025 list; up 63 since FY2020.
17	Cyphersix, LLC Top agencies DOJ (Department of Justice)	$2,700,000	0.8%	Rank history: not on the FY2022–FY2023 lists, #64 in FY2024 and not on the FY2025 list; up 38 since FY2020.
18	Integra FEC LLC Top agencies SEC (Securities and Exchange Commission)	$2,676,061	0.8%	Rank history: #21 in FY2022, #18 in FY2023, #20 in FY2024 and #34 in FY2025; up 10 since FY2020.
19	RER Solutions, Inc. Top agencies Treasury (Department of the Treasury)	$2,667,459	0.8%	Rank history: #9 in FY2022, not on the FY2023–FY2024 lists and #31 in FY2025; unchanged since FY2020.
20	Duff & Phelps LLC Through Kroll, LLC Top agencies Treasury (Department of the Treasury) DOJ (Department of Justice) SEC (Securities and Exchange Commission)	$2,449,905	0.8%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
21	Berkeley Research Group, LLC Top agencies DOJ (Department of Justice) CFTC (Commodity Futures Trading Commission) FTC (Federal Trade Commission)	$2,304,631	0.7%	Rank history: #32 in FY2022, #8 in FY2023, #8 in FY2024 and #7 in FY2025; new, not ranked in FY2020.
22	Ocean Tomo, LLC 2 awardees, including Veris Consulting, LLC Top agencies Treasury (Department of the Treasury) DOJ (Department of Justice)	$2,257,075	0.7%	Rank history: #8 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
23	ABZ Inc. Top agencies DOJ (Department of Justice)	$2,232,985	0.7%	Rank history: #23 in FY2022, #27 in FY2023, #92 in FY2024 and not on the FY2025 list; down 11 since FY2020.
24	Stout Risius Ross, LLC Top agencies DOJ (Department of Justice) CFPB (Consumer Financial Protection Bureau) SEC (Securities and Exchange Commission)	$2,198,028	0.7%	Rank history: #44 in FY2022, #60 in FY2023, #46 in FY2024 and #30 in FY2025; down 7 since FY2020.
25	Cardno Emerging Markets USA Ltd. 3 awardees, including Cardno, Inc. Top agencies DOJ (Department of Justice)	$2,079,074	0.6%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
26	Infoedge Technology, Inc. Top agencies DOS (Department of State)	$2,050,000	0.6%	Rank history: #27 in FY2022, #23 in FY2023, #17 in FY2024 and #18 in FY2025; down 8 since FY2020.
27	Capital Project Management, Inc. Top agencies DOJ (Department of Justice) Navy (Department of the Navy) DOT (Department of Transportation)	$1,961,777	0.6%	Rank history: #65 in FY2022, #42 in FY2023, #27 in FY2024 and #13 in FY2025; unchanged since FY2020.
28	Beacon Group, LLC Top agencies DOJ (Department of Justice) Navy (Department of the Navy)	$1,783,454	0.6%	Rank history: #13 in FY2022, #15 in FY2023, #11 in FY2024 and #27 in FY2025; down 14 since FY2020.
29	Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force)	$1,750,041	0.5%	Rank history: not on the FY2022–FY2023 lists, #1 in FY2024 and #1 in FY2025; new, not ranked in FY2020.
30	Pem-Iei JV LLP Top agencies DOL (Department of Labor)	$1,746,298	0.5%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; up 24 since FY2020.
31	Global Economics Group, LLC Top agencies FTC (Federal Trade Commission) Treasury (Department of the Treasury) SEC (Securities and Exchange Commission)	$1,719,775	0.5%	Rank history: #92 in FY2022, #49 in FY2023, #57 in FY2024 and #33 in FY2025; down 7 since FY2020.
32	Deloitte LLP 3 awardees, including Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top agencies DOJ (Department of Justice)	$1,687,459	0.5%	Rank history: #37 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
33	Horst Frisch Inc. Top agencies Treasury (Department of the Treasury)	$1,655,076	0.5%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; down 10 since FY2020.
34	Secretariat Economists LLC Top agencies DOJ (Department of Justice) FTC (Federal Trade Commission)	$1,640,433	0.5%	Rank history: #29 in FY2022, #70 in FY2023, #15 in FY2024 and not on the FY2025 list; down 18 since FY2020.
35	Jab Innovative Solutions LLC Top agencies DOL (Department of Labor)	$1,386,039	0.4%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; up 24 since FY2020.
36	Resolution Economics Group, LLC Top agencies Navy (Department of the Navy) DOJ (Department of Justice)	$1,344,577	0.4%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
37	Gnss Solutions Ltd Top agencies Army (Department of the Army)	$1,295,564	0.4%	Rank history: #20 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
38	Delta Consulting Group Inc. Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs)	$1,251,180	0.4%	Rank history: #28 in FY2022, #54 in FY2023, #54 in FY2024 and not on the FY2025 list; down 8 since FY2020.
39	Banner & Witcoff Ltd Top agencies SEC (Securities and Exchange Commission)	$1,245,000	0.4%	Rank history: #61 in FY2022, not on the FY2023 list, #79 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
40	Alixpartners LLP 2 awardees Top agencies SEC (Securities and Exchange Commission) Treasury (Department of the Treasury)	$1,232,195	0.4%	Rank history: #25 in FY2022, not on the FY2023–FY2024 lists and #51 in FY2025; up 7 since FY2020.
41	Natural Resources Consulting Engineers, Inc. Top agencies DOJ (Department of Justice)	$1,188,766	0.4%	Rank history: #90 in FY2022, #66 in FY2023, #31 in FY2024 and #45 in FY2025; up 8 since FY2020.
42	Willamette Management Associates, Inc. 2 awardees Top agencies DOJ (Department of Justice) Treasury (Department of the Treasury)	$1,015,105	0.3%	Rank history: not on the FY2022–FY2025 lists; up 135 since FY2020.
43	Filsinger Energy Partners, Inc. Top agencies DOJ (Department of Justice)	$1,000,000	0.3%	Rank history: not on the FY2022–FY2025 lists; up 28 since FY2020.
44	Wright Water Engineers, Inc. Top agencies DOJ (Department of Justice)	$985,263	0.3%	Rank history: not on the FY2022 list, #39 in FY2023, #34 in FY2024 and #28 in FY2025; down 9 since FY2020.
45	Maximus Inc. Through Maximus Federal Services, Inc. Top agencies SSA (Social Security Administration)	$936,020	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	Exponent Inc. 2 awardees Top agencies DOJ (Department of Justice)	$896,180	0.3%	Rank history: not on the FY2022 list, #34 in FY2023, #82 in FY2024 and not on the FY2025 list; down 13 since FY2020.
47	Chugach Alaska Corporation Through Chugach Information Technology LLC Top agencies Navy (Department of the Navy)	$895,187	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
48	Evans Water Resources Engineering PLLC Top agencies DOJ (Department of Justice)	$888,027	0.3%	Rank history: #56 in FY2022, #98 in FY2023, not on the FY2024 list and #75 in FY2025; up 24 since FY2020.
49	Mclane Environmental, LLC Top agencies DOJ (Department of Justice)	$877,054	0.3%	Rank history: not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; up 58 since FY2020.
50	Chelsea-Village Medical Office, P.C. Top agencies DOJ (Department of Justice)	$837,809	0.3%	Rank history: not on the FY2022 list, #100 in FY2023 and not on the FY2024–FY2025 lists; up 20 since FY2020.
51	David W. Larue, Ph.d. Top agencies DOJ (Department of Justice)	$764,500	0.2%	Rank history: not on the FY2022–FY2025 lists; up 155 since FY2020.
52	All Consulting, LLC Top agencies SEC (Securities and Exchange Commission)	$758,738	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Ankura Holdings, LP 2 awardees, including Ankura Consulting Group, LLC Top agencies DOE (Department of Energy) SEC (Securities and Exchange Commission)	$756,200	0.2%	Rank history: #41 in FY2022, #25 in FY2023, #58 in FY2024 and not on the FY2025 list; up 74 since FY2020.
54	Convergent Solutions Inc. Top agencies DOJ (Department of Justice)	$754,625	0.2%	Rank history: not on the FY2022–FY2025 lists; up 125 since FY2020.
55	Geosyntec Consultants, Inc. Top agencies DOJ (Department of Justice)	$747,114	0.2%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
56	Madison Consulting Group, Inc. Top agencies Treasury (Department of the Treasury)	$736,961	0.2%	Rank history: #43 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
57	Monument Economics Group LLC Top agencies DOJ (Department of Justice) Treasury (Department of the Treasury)	$728,890	0.2%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
58	JW Macdonald Associates LLC Top agencies Treasury (Department of the Treasury)	$720,001	0.2%	Rank history: not on the FY2022–FY2025 lists; up 215 since FY2020.
59	Sbcc Group Inc. Top agencies Treasury (Department of the Treasury)	$709,600	0.2%	Rank history: not on the FY2022–FY2025 lists; up 302 since FY2020.
60	Garland Actuarial LLC Top agencies Treasury (Department of the Treasury)	$658,120	0.2%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; up 55 since FY2020.
61	Re / Spec Inc. 2 awardees, including Respec Company, LLC Top agencies DOJ (Department of Justice)	$651,977	0.2%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
62	MKA International, Inc. Top agencies DOJ (Department of Justice)	$608,485	0.2%	Rank history: not on the FY2022–FY2023 lists, #99 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
63	Matthew D Cain Top agencies SEC (Securities and Exchange Commission)	$602,409	0.2%	Rank history: not on the FY2022–FY2025 lists; up 127 since FY2020.
64	Myers and Stauffer LC Top agencies DOJ (Department of Justice)	$594,451	0.2%	Rank history: not on the FY2022–FY2025 lists; down 25 since FY2020.
65	Chess Consulting LLC Top agencies DOJ (Department of Justice)	$592,912	0.2%	Rank history: #63 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
66	Stoneturn Group LLP Top agencies DOJ (Department of Justice)	$559,117	0.2%	Rank history: #47 in FY2022, #29 in FY2023, #68 in FY2024 and not on the FY2025 list; up 21 since FY2020.
67	Douglas R Carmichael Top agencies SEC (Securities and Exchange Commission)	$542,500	0.2%	Rank history: not on the FY2022–FY2025 lists; up 42 since FY2020.
68	Gradco LLC Top agencies DOJ (Department of Justice)	$532,155	0.2%	Rank history: #54 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
69	James J Angel Top agencies SEC (Securities and Exchange Commission)	$525,500	0.2%	Rank history: not on the FY2022 list, #81 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
70	RMI Valuation LLC Top agencies DOJ (Department of Justice)	$518,286	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Trauner Consulting Services, Inc. Top agencies VA (Department of Veterans Affairs)	$507,280	0.2%	Rank history: not on the FY2022–FY2023 lists, #80 in FY2024 and #39 in FY2025; up 14 since FY2020.
72	J.s. Held LLC Top agencies DOJ (Department of Justice)	$505,395	0.2%	Rank history: #16 in FY2022, #17 in FY2023, #65 in FY2024 and #35 in FY2025; new, not ranked in FY2020.
73	Gana-A' Yoo, Limited Through Kaiyuh Services, LLC Top agencies Treasury (Department of the Treasury)	$496,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	SRK Consulting (U.S.), Inc. Top agencies DOJ (Department of Justice) Treasury (Department of the Treasury)	$490,307	0.2%	Rank history: #19 in FY2022, #11 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
75	Kapilamukamal, LLP Top agencies SEC (Securities and Exchange Commission) DOJ (Department of Justice)	$480,675	0.1%	Rank history: #77 in FY2022, not on the FY2023–FY2024 lists and #76 in FY2025; up 33 since FY2020.
76	Design Research Engineering, L.L.C. Top agencies DOJ (Department of Justice)	$480,069	0.1%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
77	American Medical Experts, LLC Top agencies DOJ (Department of Justice)	$465,979	0.1%	Rank history: not on the FY2022 list, #87 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
78	Valuescope, LLC Top agencies Treasury (Department of the Treasury)	$462,058	0.1%	Rank history: not on the FY2022–FY2023 lists, #39 in FY2024 and not on the FY2025 list; down 15 since FY2020.
79	RDS Management Research, Inc. Top agencies FTC (Federal Trade Commission) DOJ (Department of Justice)	$461,900	0.1%	Rank history: not on the FY2022–FY2025 lists; up 358 since FY2020.
80	DR Kelly Clark PLLC Top agencies DOJ (Department of Justice)	$451,500	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Financial Integrity Network, LLC Through K2 Intelligence, LLC Top agencies SEC (Securities and Exchange Commission)	$447,850	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Wodehouse Consultants LLC Top agencies CFTC (Commodity Futures Trading Commission) DOJ (Department of Justice)	$445,870	0.1%	Rank history: not on the FY2022–FY2025 lists; up 163 since FY2020.
83	The Kace Company, Llc. Top agencies DOJ (Department of Justice)	$438,564	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Gary L. Fischler & Associates LLC Top agencies DOJ (Department of Justice)	$434,975	0.1%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
85	Edgeworth Economics, L.l.c Top agencies Treasury (Department of the Treasury)	$427,729	0.1%	Rank history: not on the FY2022 list, #28 in FY2023, #19 in FY2024 and not on the FY2025 list; down 29 since FY2020.
86	L.C. Lee & Associates, Inc. Top agencies DOJ (Department of Justice)	$421,416	0.1%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; up 84 since FY2020.
87	AUS Inc. Through AUS Marketing Research Systems, Inc. Top agencies CFPB (Consumer Financial Protection Bureau)	$421,313	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	GZA Geoenvironmental Technologies Inc. Through GZA Geoenvironmental Inc. Top agencies DOJ (Department of Justice)	$403,800	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Ash Consulting LLC Top agencies CFTC (Commodity Futures Trading Commission)	$393,000	0.1%	Rank history: not on the FY2022–FY2023 lists, #85 in FY2024 and not on the FY2025 list; up 68 since FY2020.
90	Forvis Mazars LLP Top agencies SEC (Securities and Exchange Commission)	$391,596	0.1%	Rank history: not on the FY2022–FY2025 lists; down 28 since FY2020.
91	TAC Insurance Consulting, LLC Top agencies Treasury (Department of the Treasury)	$388,500	0.1%	Rank history: #51 in FY2022, #50 in FY2023, #45 in FY2024 and not on the FY2025 list; up 210 since FY2020.
92	Domain Assets LLC Top agencies Treasury (Department of the Treasury)	$387,934	0.1%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
93	Eckles David L Top agencies DOJ (Department of Justice) Treasury (Department of the Treasury)	$384,644	0.1%	Rank history: not on the FY2022 list, #88 in FY2023, #29 in FY2024 and #58 in FY2025; up 276 since FY2020.
94	ZAC Ryan Appraisal Services, Inc. Top agencies Treasury (Department of the Treasury) DOJ (Department of Justice)	$383,302	0.1%	Rank history: not on the FY2022–FY2023 lists, #91 in FY2024 and not on the FY2025 list; down 4 since FY2020.
95	Midwest Medical Legal Consultants Inc. Top agencies DOJ (Department of Justice)	$378,961	0.1%	Rank history: not on the FY2022–FY2025 lists; up 40 since FY2020.
96	Elliott Davis, LLC Top agencies DOJ (Department of Justice)	$375,000	0.1%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
97	Eisenstein Malanchuk LLP Top agencies EPA (Environmental Protection Agency)	$369,967	0.1%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
98	Phillips, Fractor & Company, LLC Top agencies Treasury (Department of the Treasury)	$357,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Ebert & Associates Inc. Top agencies DOJ (Department of Justice)	$348,527	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Quandary Peak Research, Inc. Top agencies DOJ (Department of Justice)	$341,500	0.1%	Rank history: not on the FY2022–FY2023 lists, #67 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.

Show 75 more

100 of 943 contractors listed here. See the rest on GovTribe.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $321 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 PSC R424 contractors in FY2021?

1. Georgia TECH Research Corp ($49.5M), 2. Analysis Group Inc. ($17.3M), 3. Cornerstone Research Inc. ($11.9M), 4. CRA International, Inc. ($11.4M), 5. HKA Global LLC ($11M), 6. The Brattle Group Inc. ($9.02M), 7. FTI Consulting, Inc. ($6.53M), 8. Bates White, LLC ($5.6M), 9. Gordian Litigation Solutions Group, Inc. ($4.96M), 10. Historical Research Associates, Inc. ($4.22M).

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