Top 100 National Transportation Safety Board Contractors, FY2021

Name: Top 100 National Transportation Safety Board Contractors, FY2021
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

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

The top 10 won 63% of FY2021 National Transportation Safety Board contract dollars

Contract obligations: $16,169,377 Net of deobligations, by the National Transportation Safety Board and its offices
Contractors: 107 Parent companies with an obligation
Largest contractor: Deloitte LLP $4.26 million, 25.3% 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	Deloitte LLP Through Deloitte Consulting LLP Top NAICS codes 541512 Computer Systems Design Services	$4,259,735	25.3%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; new, not ranked in FY2020.
2	General Dynamics Corporation 2 awardees, including General Dynamics Information Technology, Inc. and General Dynamics Mission Systems, Inc. Top NAICS codes 541519 Other Computer Related Services 334220 Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing	$1,494,837	8.9%	Rank history: #7 in FY2022, #6 in FY2023, #9 in FY2024 and #7 in FY2025; down 1 since FY2020.
3	Salmon Fells Moore, LLC Top NAICS codes 541512 Computer Systems Design Services	$868,565	5.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
4	Alvarez LLC Top NAICS codes 541519 Other Computer Related Services	$687,603	4.1%	Rank history: not on the FY2022–FY2024 lists and #71 in FY2025; new, not ranked in FY2020.
5	Teya Enterprises LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$681,011	4.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
6	Insight Public Sector Inc. Top NAICS codes 511210 Software Publishers	$680,694	4.0%	Rank history: #2 in FY2022, #4 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
7	MCP Computer Products Inc. Top NAICS codes 443120 Computer and Software Stores	$628,896	3.7%	Rank history: #10 in FY2022, #2 in FY2023, #17 in FY2024 and #35 in FY2025; down 5 since FY2020.
8	Sectek, Inc. Top NAICS codes 561612 Security Guards and Patrol Services	$527,648	3.1%	Rank history: #5 in FY2022, #8 in FY2023, #7 in FY2024 and #8 in FY2025; new, not ranked in FY2020.
9	Potomac Creek Associates, L.L.C. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 531120 Lessors of Nonresidential Buildings (except Miniwarehouses)	$466,850	2.8%	Rank history: #6 in FY2022, #7 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
10	Crittenton Consulting Group, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$386,280	2.3%	Rank history: #9 in FY2022, #16 in FY2023, #10 in FY2024 and #13 in FY2025; down 2 since FY2020.
11	Capital Consulting Corp Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$283,307	1.7%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
12	Verizon Communications Inc. Through Verizon Business Network Services LLC Top NAICS codes 517110 Wired Telecommunications Carriers 517919 All Other Telecommunications	$266,318	1.6%	Rank history: #22 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
13	H.i.g. Capital Management Inc. Through Iron Bow Technologies, LLC Top NAICS codes 541519 Other Computer Related Services	$250,564	1.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
14	Bulletin Intelligence LLC Through Cision US Inc. Top NAICS codes 541910 Marketing Research and Public Opinion Polling	$238,816	1.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
15	Varex Imaging Corp Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 541380 Testing Laboratories and Services	$238,166	1.4%	Rank history: #60 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; up 30 since FY2020.
16	At&T Inc. Through Att Mobility LLC Top NAICS codes 517312 Wireless Telecommunications Carriers (except Satellite)	$225,413	1.3%	Rank history: #13 in FY2022, #13 in FY2023, #15 in FY2024 and #14 in FY2025; down 10 since FY2020.
17	Carahsoft Technology Corp Top NAICS codes 511210 Software Publishers 541519 Other Computer Related Services	$213,848	1.3%	Rank history: #23 in FY2022, #28 in FY2023, #5 in FY2024 and #6 in FY2025; up 3 since FY2020.
18	Gartner, Inc. Top NAICS codes 519120 Libraries and Archives	$209,873	1.2%	Rank history: #8 in FY2022, #17 in FY2023, #13 in FY2024 and #17 in FY2025; new, not ranked in FY2020.
19	Government Scientific Source Inc. Top NAICS codes 334516 Analytical Laboratory Instrument Manufacturing	$207,963	1.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
20	GMC TEK LLC Top NAICS codes 541519 Other Computer Related Services	$184,177	1.1%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.
21	Open Text Corporation Through Open Text Public Sector Solutions, Inc. Top NAICS codes 443120 Computer and Software Stores	$173,903	1.0%	Rank history: #15 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
22	Equinix, Inc. Top NAICS codes 541519 Other Computer Related Services	$171,000	1.0%	Rank history: not on the FY2022 list, #20 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
23	Economic Systems Inc. Top NAICS codes 541612 Human Resources Consulting Services	$164,983	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
24	Thundercat Technology, LLC Top NAICS codes 541519 Other Computer Related Services	$155,727	0.9%	Rank history: #16 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
25	Reed Elsevier Inc. 2 awardees, including Relx Inc. and Lnrs Data Services Inc. Top NAICS codes 519130 Internet Publishing and Broadcasting and Web Search Portals 511210 Software Publishers	$147,352	0.9%	Rank history: #32 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
26	Free State Reporting, Inc. Top NAICS codes 561320 Temporary Help Services	$145,552	0.9%	Rank history: #17 in FY2022, #21 in FY2023, #23 in FY2024 and #33 in FY2025; down 11 since FY2020.
27	GMG Management Consulting Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$120,000	0.7%	Rank history: #20 in FY2022, #25 in FY2023, #26 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
28	Bahfed Corp Top NAICS codes 541519 Other Computer Related Services	$109,366	0.6%	Rank history: not on the FY2022–FY2024 lists and #38 in FY2025; down 2 since FY2020.
29	Netsync Network Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$102,346	0.6%	Rank history: #12 in FY2022, #10 in FY2023, #20 in FY2024 and #12 in FY2025; new, not ranked in FY2020.
30	Windrose Media LLC Top NAICS codes 519130 Internet Publishing and Broadcasting and Web Search Portals	$80,000	0.5%	Rank history: #31 in FY2022, #29 in FY2023, #14 in FY2024 and #23 in FY2025; down 3 since FY2020.
31	Global Telecom & Technology Inc. Through GTT Americas, LLC Top NAICS codes 517919 All Other Telecommunications	$77,500	0.5%	Rank history: #26 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
32	Arrow Electronics, Inc. Through Immixtechnology Inc. Top NAICS codes 541519 Other Computer Related Services	$73,129	0.4%	Rank history: #27 in FY2022, #50 in FY2023, #45 in FY2024 and #41 in FY2025; down 4 since FY2020.
33	Grey Wall Software, LLC Top NAICS codes 511210 Software Publishers	$70,275	0.4%	Rank history: #29 in FY2022, #38 in FY2023, #31 in FY2024 and #55 in FY2025; down 10 since FY2020.
34	Ains, LLC Top NAICS codes 541519 Other Computer Related Services	$64,016	0.4%	Rank history: #30 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; down 24 since FY2020.
35	United Parcel Service Inc. 2 awardees Top NAICS codes 492110 Couriers and Express Delivery Services	$61,960	0.4%	Rank history: #28 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
36	General Electric Company Through GE Aviation Systems LLC Top NAICS codes 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing	$58,380	0.3%	Rank history: not on the FY2022 list, #73 in FY2023, not on the FY2024 list and #64 in FY2025; up 44 since FY2020.
37	Four LLC Top NAICS codes 541519 Other Computer Related Services	$55,834	0.3%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
38	O'riordan Bethel Law Firm, LLP (The) Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$55,000	0.3%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
39	Environmental Systems Research Institute, Inc. Top NAICS codes 511210 Software Publishers	$52,120	0.3%	Rank history: #63 in FY2022, #74 in FY2023, #64 in FY2024 and #63 in FY2025; up 31 since FY2020.
40	L3Harris Technologies, Inc. Top NAICS codes 541511 Custom Computer Programming Services	$50,000	0.3%	Rank history: #35 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
41	Tvar Solutions, LLC Top NAICS codes 511210 Software Publishers	$46,169	0.3%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; down 12 since FY2020.
42	Partnership for Public Service Inc. Top NAICS codes 611430 Professional and Management Development Training	$45,600	0.3%	Rank history: #33 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
43	Siemens Aktiengesellschaft Through Siemens Industry Software Inc. Top NAICS codes 511210 Software Publishers	$45,360	0.3%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
44	Mvation Worldwide, Inc. Top NAICS codes 334111 Electronic Computer Manufacturing	$44,601	0.3%	Rank history: not on the FY2022–FY2024 lists and #74 in FY2025; down 7 since FY2020.
45	CDW Corporation Through CDW Government LLC Top NAICS codes 334111 Electronic Computer Manufacturing	$44,338	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	KLD Labs Inc. Top NAICS codes 334513 Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables	$43,278	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	Hrworx, LLC Top NAICS codes 511210 Software Publishers	$41,380	0.2%	Rank history: #76 in FY2022, #86 in FY2023, #73 in FY2024 and #75 in FY2025; new, not ranked in FY2020.
48	The Mathworks, Inc. Top NAICS codes 511210 Software Publishers	$40,915	0.2%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
49	Canto, Inc. Top NAICS codes 511210 Software Publishers	$39,950	0.2%	Rank history: #42 in FY2022, #52 in FY2023, #47 in FY2024 and #45 in FY2025; new, not ranked in FY2020.
50	Municipal Emergency Services, Inc. Top NAICS codes 315990 Apparel Accessories and Other Apparel Manufacturing	$37,728	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	Diligent Corporation Top NAICS codes 511210 Software Publishers	$35,475	0.2%	Rank history: #44 in FY2022, #33 in FY2023, #28 in FY2024 and not on the FY2025 list; down 4 since FY2020.
52	Advanced Computer Concepts, Inc. Top NAICS codes 541519 Other Computer Related Services	$34,796	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Karcher Group Inc. Top NAICS codes 334310 Audio and Video Equipment Manufacturing	$34,322	0.2%	Rank history: #45 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
54	EAP Consultants, LLC Top NAICS codes 561611 Investigation and Personal Background Check Services	$32,064	0.2%	Rank history: #47 in FY2022, #91 in FY2023, #38 in FY2024 and #29 in FY2025; down 11 since FY2020.
55	Vintage Radials Inc. Top NAICS codes 811310 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance	$31,200	0.2%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
56	Transpondr LLC Top NAICS codes 517911 Telecommunications Resellers	$30,845	0.2%	Rank history: #48 in FY2022, #47 in FY2023, #46 in FY2024 and not on the FY2025 list; down 12 since FY2020.
57	Metaflows Inc. Top NAICS codes 511210 Software Publishers	$30,602	0.2%	Rank history: #49 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; down 11 since FY2020.
58	Executive Information Systems, L.L.C. Top NAICS codes 541519 Other Computer Related Services	$28,064	0.2%	Rank history: #59 in FY2022, #68 in FY2023, #62 in FY2024 and #60 in FY2025; new, not ranked in FY2020.
59	Sinclair Broadcast Group Inc. Through Politico, LLC Top NAICS codes 519130 Internet Publishing and Broadcasting and Web Search Portals	$27,557	0.2%	Rank history: #51 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
60	American Security Programs Inc Top NAICS codes 561612 Security Guards and Patrol Services	$25,219	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Kohlman Systems Research, Inc. Top NAICS codes 511210 Software Publishers	$25,000	0.1%	Rank history: #61 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
62	Mechanical Simulation Corp Top NAICS codes 511210 Software Publishers	$25,000	0.1%	Rank history: #53 in FY2022, #61 in FY2023, #55 in FY2024 and #54 in FY2025; down 11 since FY2020.
63	National Academy of Sciences Top NAICS codes 611519 Other Technical and Trade Schools	$25,000	0.1%	Rank history: #54 in FY2022, #62 in FY2023, #56 in FY2024 and #57 in FY2025; down 5 since FY2020.
64	Proven Management LLC Top NAICS codes 541614 Process, Physical Distribution, and Logistics Consulting Services	$25,000	0.1%	Rank history: not on the FY2022 list, #71 in FY2023, #57 in FY2024 and #58 in FY2025; up 9 since FY2020.
65	Deidiker Accounting & Consulting LLC Top NAICS codes 541211 Offices of Certified Public Accountants	$24,900	0.1%	Rank history: #55 in FY2022, not on the FY2023–FY2024 lists and #72 in FY2025; up 2 since FY2020.
66	University of Wisconsin System Top NAICS codes 511210 Software Publishers	$24,684	0.1%	Rank history: #52 in FY2022, #58 in FY2023, #53 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
67	Chester Fisher Top NAICS codes 541612 Human Resources Consulting Services	$24,500	0.1%	Rank history: #68 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
68	Critical Mention, Inc. Top NAICS codes 519110 News Syndicates	$23,500	0.1%	Rank history: #57 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 15 since FY2020.
69	Kpaul Properties LLC Top NAICS codes 541519 Other Computer Related Services	$23,337	0.1%	Rank history: #19 in FY2022, #82 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
70	Xerox Holdings Corp Through Xerox Corporation Top NAICS codes 333316 Photographic and Photocopying Equipment Manufacturing	$23,220	0.1%	Rank history: #58 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; down 36 since FY2020.
71	Faro Technologies Inc. Top NAICS codes 334513 Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables 315990 Apparel Accessories and Other Apparel Manufacturing	$19,849	0.1%	Rank history: #65 in FY2022, #35 in FY2023, not on the FY2024 list and #67 in FY2025; down 8 since FY2020.
72	Advanced Rotorcraft Technology, Inc. Top NAICS codes 511210 Software Publishers	$18,900	0.1%	Rank history: #62 in FY2022, #37 in FY2023, #66 in FY2024 and #48 in FY2025; down 11 since FY2020.
73	Fedtek, Inc. Top NAICS codes 334111 Electronic Computer Manufacturing	$17,394	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Pre-Employment Investigations, Inc. Top NAICS codes 561611 Investigation and Personal Background Check Services	$16,000	0.1%	Rank history: #36 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
75	Ideal System Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$15,087	0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
76	Waygate Technologies USA LP Top NAICS codes 334519 Other Measuring and Controlling Device Manufacturing 334517 Irradiation Apparatus Manufacturing	$14,587	0.1%	Rank history: #89 in FY2022, #79 in FY2023, #61 in FY2024 and #65 in FY2025; down 44 since FY2020.
77	Architechture Solutions LLC Top NAICS codes 541519 Other Computer Related Services	$14,272	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Exelon Corporation Through Potomac Electric Power Co Top NAICS codes 221122 Electric Power Distribution	$13,750	0.1%	Rank history: #34 in FY2022, #41 in FY2023, #36 in FY2024 and not on the FY2025 list; down 38 since FY2020.
79	Berkshire Hathaway Inc. Through Flightsafety International Inc. Top NAICS codes 611512 Flight Training	$11,760	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Accusoft Corporation Top NAICS codes 541519 Other Computer Related Services	$11,750	0.1%	Rank history: #69 in FY2022, #81 in FY2023, #52 in FY2024 and not on the FY2025 list; down 8 since FY2020.
81	21St Century Solutions, Ltd. Top NAICS codes 334290 Other Communications Equipment Manufacturing	$11,419	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Rosetta Stone Ltd. Top NAICS codes 511210 Software Publishers	$10,810	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Questivity, Inc. Top NAICS codes 334111 Electronic Computer Manufacturing	$10,739	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Institute for Management Studies, Inc. Top NAICS codes 611430 Professional and Management Development Training	$10,220	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Stuart B. Consultants, Inc. Top NAICS codes 541930 Translation and Interpretation Services	$10,000	0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; down 21 since FY2020.
86	Lumen Technologies, Inc. Through Lumen Technologies Government Solutions, Inc. Top NAICS codes 517110 Wired Telecommunications Carriers	$10,000	0.1%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; down 45 since FY2020.
87	Clearavenue LLC Top NAICS codes 541512 Computer Systems Design Services	$10,000	0.1%	Rank history: not on the FY2022–FY2025 lists; down 69 since FY2020.
88	Thermo Electron Corporation Through Thermo Electron North America LLC Top NAICS codes 811219 Other Electronic and Precision Equipment Repair and Maintenance	$9,979	0.1%	Rank history: #72 in FY2022, #43 in FY2023, #72 in FY2024 and not on the FY2025 list; down 49 since FY2020.
89	Aurora Systems Consulting Inc. Top NAICS codes 541519 Other Computer Related Services	$8,858	0.1%	Rank history: not on the FY2022–FY2025 lists; down 23 since FY2020.
90	Human Resources Technologies, Inc. Top NAICS codes 541519 Other Computer Related Services	$8,808	0.1%	Rank history: not on the FY2022 list, #97 in FY2023, #79 in FY2024 and not on the FY2025 list; up 11 since FY2020.
91	United Group Inc. Top NAICS codes 337214 Office Furniture (except Wood) Manufacturing	$8,387	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	SE Software, Inc. Top NAICS codes 511210 Software Publishers	$7,990	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	General Communication Inc. Through GCI Communication Corp. Top NAICS codes 515210 Cable and Other Subscription Programming	$7,297	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	John Wiley & Sons Inc. Top NAICS codes 511210 Software Publishers	$7,200	<0.1%	Rank history: #79 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
95	LRP Publications, Inc. Top NAICS codes 541519 Other Computer Related Services	$7,106	<0.1%	Rank history: #80 in FY2022, #89 in FY2023, #75 in FY2024 and #78 in FY2025; down 8 since FY2020.
96	Engineering Dynamics Company, LLC Top NAICS codes 511210 Software Publishers	$6,383	<0.1%	Rank history: #82 in FY2022, #90 in FY2023, #77 in FY2024 and #79 in FY2025; down 5 since FY2020.
97	Healthequity, Inc. 2 awardees Top NAICS codes 524292 Pharmacy Benefit Management and Other Third Party Administration of Insurance and Pension Funds	$5,851	<0.1%	Rank history: #81 in FY2022, #98 in FY2023, #80 in FY2024 and #86 in FY2025; up 13 since FY2020.
98	Tactical Digital Corporation Top NAICS codes 611420 Computer Training	$5,612	<0.1%	Rank history: not on the FY2022 list, #69 in FY2023 and not on the FY2024–FY2025 lists; down 20 since FY2020.
99	Recovery Point Systems Inc. Top NAICS codes 561210 Facilities Support Services	$5,278	<0.1%	Rank history: not on the FY2022 list, #92 in FY2023, #85 in FY2024 and #84 in FY2025; down 3 since FY2020.
100	Originlab Corp Top NAICS codes 611420 Computer Training	$4,930	<0.1%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.

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100 of 107 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 $16.9 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 National Transportation Safety Board contractors in FY2021?

1. Deloitte LLP ($4.26M), 2. General Dynamics Corporation ($1.49M), 3. Salmon Fells Moore, LLC ($869K), 4. Alvarez LLC ($688K), 5. Teya Enterprises LLC ($681K), 6. Insight Public Sector Inc. ($681K), 7. MCP Computer Products Inc. ($629K), 8. Sectek, Inc. ($528K), 9. Potomac Creek Associates, L.L.C. ($467K), 10. Crittenton Consulting Group, Inc. ($386K).

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