Top 100 Nuclear Regulatory Commission Contractors, FY2021

Name: Top 100 Nuclear Regulatory Commission 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 47% of FY2021 Nuclear Regulatory Commission contract dollars

Contract obligations: $166,632,842 Net of deobligations, by the Nuclear Regulatory Commission and its offices
Contractors: 292 Parent companies with an obligation
Largest contractor: Teksynap Corporation $20.1 million, 11.3% 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	Teksynap Corporation Top NAICS codes 541512 Computer Systems Design Services	$20,091,544	11.3%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; up 1 since FY2020.
2	Leidos Holdings, Inc. Through Leidos, Inc. Top NAICS codes 541511 Custom Computer Programming Services 541519 Other Computer Related Services	$13,821,022	7.8%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; down 1 since FY2020.
3	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top NAICS codes 541519 Other Computer Related Services	$13,747,749	7.8%	Rank history: #3 in FY2022, #4 in FY2023, #24 in FY2024 and not on the FY2025 list; unchanged since FY2020.
4	Oasis Systems, LLC Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services 541511 Custom Computer Programming Services	$8,854,639	5.0%	Rank history: #4 in FY2022, #3 in FY2023, #4 in FY2024 and #3 in FY2025; unchanged since FY2020.
5	Northramp LLC Top NAICS codes 541511 Custom Computer Programming Services	$6,552,589	3.7%	Rank history: #9 in FY2022, #5 in FY2023, #10 in FY2024 and #8 in FY2025; unchanged since FY2020.
6	Aegis.net, Inc. Top NAICS codes 541519 Other Computer Related Services	$4,692,245	2.6%	Rank history: #10 in FY2022, #10 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
7	Dell Federal Systems L.P. Through Dell Marketing L.P. Top NAICS codes 511210 Software Publishers	$4,308,122	2.4%	Rank history: #6 in FY2022, #7 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
8	Southwest Research Institute Top NAICS codes 562211 Hazardous Waste Treatment and Disposal 541690 Other Scientific and Technical Consulting Services	$4,179,963	2.4%	Rank history: #11 in FY2022, #6 in FY2023, #7 in FY2024 and #21 in FY2025; down 2 since FY2020.
9	Verizon Communications Inc. 7 awardees, including Verizon Business Network Services LLC, Cellco Partnership and Verizon Pennsylvania LLC Top NAICS codes 517110 Wired Telecommunications Carriers 517312 Wireless Telecommunications Carriers (except Satellite) 517311 Wired Telecommunications Carriers	$4,020,498	2.3%	Rank history: #8 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
10	AMG JV Top NAICS codes 236220 Commercial and Institutional Building Construction	$3,570,000	2.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
11	Centeva LLC Top NAICS codes 541519 Other Computer Related Services 541990 All Other Professional, Scientific, and Technical Services	$2,787,240	1.6%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
12	Tower Facility Management, LLC Top NAICS codes 561210 Facilities Support Services 238990 All Other Specialty Trade Contractors	$2,651,766	1.5%	Rank history: #14 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
13	Advanced Systems Technology & Management, Inc. Top NAICS codes 541330 Engineering Services	$2,444,000	1.4%	Rank history: #12 in FY2022, not on the FY2023 list, #12 in FY2024 and #44 in FY2025; up 15 since FY2020.
14	MCP Computer Products Inc. Top NAICS codes 443120 Computer and Software Stores	$2,440,975	1.4%	Rank history: #7 in FY2022, #14 in FY2023, #13 in FY2024 and #17 in FY2025; up 37 since FY2020.
15	Thomas Scientific LLC Through Unison Software Inc. Top NAICS codes 511210 Software Publishers	$2,341,954	1.3%	Rank history: #27 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
16	Mythics, LLC Through Emergent, LLC Top NAICS codes 511210 Software Publishers 334111 Electronic Computer Manufacturing 541519 Other Computer Related Services	$2,267,011	1.3%	Rank history: #20 in FY2022, #32 in FY2023, #35 in FY2024 and #26 in FY2025; up 7 since FY2020.
17	Information Systems Laboratories Inc. 2 awardees Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541330 Engineering Services	$1,884,132	1.1%	Rank history: #19 in FY2022, #11 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
18	Ip-Plus Consulting, Inc. Top NAICS codes 541519 Other Computer Related Services	$1,800,469	1.0%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
19	The Chenega Corporation 3 awardees, including Chenega Healthcare Services LLC and Chenega Logistics, LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 541513 Computer Facilities Management Services	$1,767,705	1.0%	Rank history: #39 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
20	Four LLC Top NAICS codes 541519 Other Computer Related Services	$1,675,123	0.9%	Rank history: #29 in FY2022, #24 in FY2023, #5 in FY2024 and #10 in FY2025; up 4 since FY2020.
21	Immersive Concepts L.L.C. Top NAICS codes 541519 Other Computer Related Services 519130 Internet Publishing and Broadcasting and Web Search Portals	$1,491,000	0.8%	Rank history: #16 in FY2022, #22 in FY2023, #16 in FY2024 and #9 in FY2025; down 1 since FY2020.
22	Price Modern LLC Top NAICS codes 337214 Office Furniture (except Wood) Manufacturing	$1,264,101	0.7%	Rank history: #44 in FY2022, #69 in FY2023, #60 in FY2024 and not on the FY2025 list; up 68 since FY2020.
23	Alcazar Trades, Inc. Top NAICS codes 561720 Janitorial Services	$1,249,094	0.7%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
24	G2Sf LLC Top NAICS codes 541513 Computer Facilities Management Services	$1,247,327	0.7%	Rank history: not on the FY2022–FY2023 lists, #57 in FY2024 and #33 in FY2025; up 6 since FY2020.
25	Huron Consulting Group Incorporated Through Huron Consulting Services LLC Top NAICS codes 541511 Custom Computer Programming Services	$1,208,475	0.7%	Rank history: #15 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
26	Koniag Management Solutions LLC Top NAICS codes 541519 Other Computer Related Services	$1,199,705	0.7%	Rank history: #13 in FY2022, #15 in FY2023, #26 in FY2024 and #57 in FY2025; new, not ranked in FY2020.
27	Corporate Interiors Inc. Top NAICS codes 337211 Wood Office Furniture Manufacturing	$1,187,000	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Clark Baty Associates Inc. Top NAICS codes 541519 Other Computer Related Services	$1,171,922	0.7%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
29	Thundercat Technology, LLC Top NAICS codes 541519 Other Computer Related Services	$1,165,778	0.7%	Rank history: #36 in FY2022 and not on the FY2023–FY2025 lists; up 256 since FY2020.
30	Govsmart, Inc. Top NAICS codes 541519 Other Computer Related Services	$1,153,940	0.7%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; up 16 since FY2020.
31	Competitive Innovations LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$1,099,031	0.6%	Rank history: #65 in FY2022, #89 in FY2023, #83 in FY2024 and not on the FY2025 list; up 6 since FY2020.
32	Business Management Associates Inc. Top NAICS codes 541612 Human Resources Consulting Services	$1,081,644	0.6%	Rank history: #30 in FY2022, #29 in FY2023, #87 in FY2024 and #36 in FY2025; up 23 since FY2020.
33	ICF International, Inc. Through ICF Incorporated, L.L.C. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541690 Other Scientific and Technical Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$1,023,751	0.6%	Rank history: #31 in FY2022, #43 in FY2023 and not on the FY2024–FY2025 lists; up 37 since FY2020.
34	Cape Fox Corporation Through Navar Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,020,829	0.6%	Rank history: not on the FY2022–FY2023 lists, #69 in FY2024 and #62 in FY2025; down 2 since FY2020.
35	AE Works Ltd Top NAICS codes 236220 Commercial and Institutional Building Construction	$1,020,654	0.6%	Rank history: not on the FY2022–FY2025 lists; up 49 since FY2020.
36	Oak Ridge Associated Universities, Incorporated Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$872,669	0.5%	Rank history: #28 in FY2022, #37 in FY2023, #22 in FY2024 and #34 in FY2025; down 2 since FY2020.
37	Evolution Management, Inc. Top NAICS codes 611430 Professional and Management Development Training	$849,304	0.5%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; up 28 since FY2020.
38	Semanticbits LLC Top NAICS codes 541519 Other Computer Related Services	$847,177	0.5%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
39	SD Solutions LLC Top NAICS codes 541618 Other Management Consulting Services	$823,055	0.5%	Rank history: #81 in FY2022, #33 in FY2023, #46 in FY2024 and #40 in FY2025; up 30 since FY2020.
40	Applied Programming Technology Inc. Top NAICS codes 541511 Custom Computer Programming Services	$820,000	0.5%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; up 40 since FY2020.
41	Engineering Mechanics Corporation of Columbus Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$779,273	0.4%	Rank history: #41 in FY2022, #68 in FY2023, #48 in FY2024 and #67 in FY2025; up 48 since FY2020.
42	Data Systems Analysts Inc. Through Project Performance Company, LLC Top NAICS codes 541511 Custom Computer Programming Services 541519 Other Computer Related Services	$765,313	0.4%	Rank history: #33 in FY2022, #38 in FY2023, #99 in FY2024 and not on the FY2025 list; up 3 since FY2020.
43	Arctic Slope Regional Corporation Through Vistronix, LLC Top NAICS codes 541519 Other Computer Related Services	$755,771	0.4%	Rank history: not on the FY2022–FY2023 lists, #52 in FY2024 and #37 in FY2025; down 5 since FY2020.
44	Bahfed Corp Top NAICS codes 541519 Other Computer Related Services	$740,198	0.4%	Rank history: not on the FY2022 list, #44 in FY2023, #31 in FY2024 and #48 in FY2025; unchanged since FY2020.
45	Heritage Interiors LLC Top NAICS codes 337127 Institutional Furniture Manufacturing	$701,370	0.4%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
46	Eagle Integrated Services, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$679,726	0.4%	Rank history: #25 in FY2022, #30 in FY2023, #39 in FY2024 and #56 in FY2025; new, not ranked in FY2020.
47	Strategic Endeavor LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$676,760	0.4%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
48	Code Plus, Inc. Top NAICS codes 541511 Custom Computer Programming Services	$675,331	0.4%	Rank history: #32 in FY2022, #35 in FY2023, #41 in FY2024 and #72 in FY2025; up 1 since FY2020.
49	Enterprise Technology Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$669,690	0.4%	Rank history: #50 in FY2022, #53 in FY2023, #94 in FY2024 and #91 in FY2025; up 37 since FY2020.
50	Science Applications International Corporation Top NAICS codes 541519 Other Computer Related Services	$664,554	0.4%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
51	Chainbridge Solutions Incorporated Top NAICS codes 541511 Custom Computer Programming Services	$660,178	0.4%	Rank history: #59 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; up 101 since FY2020.
52	Advanced Computer Concepts, Inc. Top NAICS codes 541519 Other Computer Related Services	$650,649	0.4%	Rank history: not on the FY2022–FY2024 lists and #64 in FY2025; up 209 since FY2020.
53	Neal R. Gross and Company, Inc. Top NAICS codes 561492 Court Reporting and Stenotype Services	$650,000	0.4%	Rank history: #56 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; up 83 since FY2020.
54	Carahsoft Technology Corp Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 541519 Other Computer Related Services	$647,235	0.4%	Rank history: #46 in FY2022, #48 in FY2023, #37 in FY2024 and #51 in FY2025; up 7 since FY2020.
55	Grant Thornton International Ltd Through Grant Thornton LLP Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$640,998	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Numark Associates, Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$622,372	0.4%	Rank history: #75 in FY2022, #31 in FY2023, #51 in FY2024 and #60 in FY2025; down 38 since FY2020.
57	Red Heritage Media LLC Top NAICS codes 561410 Document Preparation Services 611430 Professional and Management Development Training	$612,311	0.3%	Rank history: #85 in FY2022, #57 in FY2023, not on the FY2024 list and #97 in FY2025; up 24 since FY2020.
58	Advanced Computer Learning Co, LLC Top NAICS codes 611710 Educational Support Services	$596,000	0.3%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
59	Sabre88, LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 561110 Office Administrative Services	$570,134	0.3%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; up 14 since FY2020.
60	Att Mobility LLC Top NAICS codes 541519 Other Computer Related Services	$560,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Green Powered Technology LLC Top NAICS codes 561410 Document Preparation Services	$556,000	0.3%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 95 since FY2020.
62	Integration Technologies Group, Inc. Top NAICS codes 541519 Other Computer Related Services	$534,930	0.3%	Rank history: #55 in FY2022, #59 in FY2023, #63 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
63	4 Star Technologies, Inc. Top NAICS codes 541519 Other Computer Related Services	$525,341	0.3%	Rank history: #52 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; down 48 since FY2020.
64	Kikiktagruk Inupiat Corp Through Midnight Sun Technologies LLC Top NAICS codes 561110 Office Administrative Services	$509,186	0.3%	Rank history: #48 in FY2022, #45 in FY2023, not on the FY2024 list and #49 in FY2025; up 11 since FY2020.
65	The Pennsylvania State University Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$506,900	0.3%	Rank history: #72 in FY2022, #77 in FY2023, #53 in FY2024 and #73 in FY2025; up 33 since FY2020.
66	Exitech Corporation Top NAICS codes 541519 Other Computer Related Services	$462,000	0.3%	Rank history: #79 in FY2022, #70 in FY2023, #73 in FY2024 and #63 in FY2025; up 6 since FY2020.
67	Intellizant LLC Top NAICS codes 541519 Other Computer Related Services	$459,541	0.3%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; up 29 since FY2020.
68	Pathfinder Consultants, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$450,000	0.3%	Rank history: #76 in FY2022, #72 in FY2023, #58 in FY2024 and #79 in FY2025; up 14 since FY2020.
69	Regents of the University of Michigan Top NAICS codes 541330 Engineering Services 541690 Other Scientific and Technical Consulting Services	$443,124	0.3%	Rank history: not on the FY2022 list, #87 in FY2023, #97 in FY2024 and #100 in FY2025; up 8 since FY2020.
70	Four Points Technology, L.L.C. Top NAICS codes 541519 Other Computer Related Services	$435,248	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Alvarez LLC Top NAICS codes 541519 Other Computer Related Services	$424,455	0.2%	Rank history: #63 in FY2022, not on the FY2023–FY2024 lists and #13 in FY2025; down 28 since FY2020.
72	S C & A Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541620 Environmental Consulting Services	$422,609	0.2%	Rank history: not on the FY2022–FY2024 lists and #54 in FY2025; new, not ranked in FY2020.
73	Institute of Nuclear Power Operations, Inc. Top NAICS codes 541519 Other Computer Related Services	$418,323	0.2%	Rank history: #70 in FY2022, #79 in FY2023, #50 in FY2024 and not on the FY2025 list; up 14 since FY2020.
74	Beckman & Associates Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$393,845	0.2%	Rank history: #35 in FY2022, #61 in FY2023, #68 in FY2024 and #65 in FY2025; down 55 since FY2020.
75	Corys Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$387,200	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Leidos, Inc. Top NAICS codes 541519 Other Computer Related Services	$373,615	0.2%	Rank history: not on the FY2022–FY2025 lists; down 54 since FY2020.
77	Alaska Native Government Services LLC Through Copper River Enterprise Services, LLC Top NAICS codes 541519 Other Computer Related Services	$371,546	0.2%	Rank history: #24 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
78	Aqiwo, Inc. Top NAICS codes 541512 Computer Systems Design Services	$368,450	0.2%	Rank history: #78 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
79	New TECH Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$365,297	0.2%	Rank history: #51 in FY2022, #99 in FY2023, #33 in FY2024 and #30 in FY2025; down 38 since FY2020.
80	Vectrona LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$349,160	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Fcn, Inc. Top NAICS codes 541519 Other Computer Related Services	$347,384	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Renaissance Code Development LLC Top NAICS codes 541511 Custom Computer Programming Services 541690 Other Scientific and Technical Consulting Services	$340,400	0.2%	Rank history: #82 in FY2022, #46 in FY2023, #79 in FY2024 and #42 in FY2025; down 23 since FY2020.
83	Centroid Pic Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$338,074	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Gartner, Inc. Top NAICS codes 541519 Other Computer Related Services	$336,359	0.2%	Rank history: not on the FY2022–FY2023 lists, #81 in FY2024 and not on the FY2025 list; up 45 since FY2020.
85	Actionet Inc. Top NAICS codes 541511 Custom Computer Programming Services	$328,636	0.2%	Rank history: not on the FY2022–FY2025 lists; up 50 since FY2020.
86	SBG Technology Solutions Inc. Top NAICS codes 541512 Computer Systems Design Services	$309,955	0.2%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
87	August Schell Enterprises, Inc. Top NAICS codes 541519 Other Computer Related Services	$307,461	0.2%	Rank history: not on the FY2022 list, #95 in FY2023, #67 in FY2024 and #45 in FY2025; new, not ranked in FY2020.
88	Advanced Health Education Center, Ltd Top NAICS codes 611699 All Other Miscellaneous Schools and Instruction	$304,000	0.2%	Rank history: not on the FY2022–FY2025 lists; up 46 since FY2020.
89	Larsonallen LLP Through Cliftonlarsonallen LLP Top NAICS codes 541219 Other Accounting Services	$300,393	0.2%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
90	Afm, LLC Top NAICS codes 519190 All Other Information Services	$300,000	0.2%	Rank history: #69 in FY2022, not on the FY2023 list, #78 in FY2024 and #78 in FY2025; new, not ranked in FY2020.
91	Archaeologic Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$298,701	0.2%	Rank history: #62 in FY2022, #88 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
92	OSI Systems Inc. Through Rapiscan Systems Inc. Top NAICS codes 334511 Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing	$293,814	0.2%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
93	Barnallen Technologies, Inc. Top NAICS codes 519190 All Other Information Services 561499 All Other Business Support Services	$286,273	0.2%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
94	General Dynamics Corporation 3 awardees, including General Dynamics Mission Systems, Inc. and General Dynamics Information Technology Inc. Top NAICS codes 517919 All Other Telecommunications 541512 Computer Systems Design Services	$285,971	0.2%	Rank history: not on the FY2022–FY2025 lists; up 115 since FY2020.
95	Bravo Consulting Group, LLC Top NAICS codes 541512 Computer Systems Design Services	$283,850	0.2%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
96	Software Information Resource Corp. Top NAICS codes 541519 Other Computer Related Services	$282,744	0.2%	Rank history: not on the FY2022–FY2025 lists; down 39 since FY2020.
97	Microsoft Corporation Top NAICS codes 541513 Computer Facilities Management Services	$277,000	0.2%	Rank history: not on the FY2022–FY2025 lists; down 19 since FY2020.
98	Premier Management Corp Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$272,604	0.2%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
99	Translation Excellence Inc. Top NAICS codes 541930 Translation and Interpretation Services	$270,000	0.2%	Rank history: #45 in FY2022, #50 in FY2023, #40 in FY2024 and #29 in FY2025; new, not ranked in FY2020.
100	Vantage Human Resource Services, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$251,000	0.1%	Rank history: #95 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.

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100 of 292 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 $177 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 Nuclear Regulatory Commission contractors in FY2021?

1. Teksynap Corporation ($20.1M), 2. Leidos Holdings, Inc. ($13.8M), 3. CGI Technologies and Solutions Inc. ($13.7M), 4. Oasis Systems, LLC ($8.85M), 5. Northramp LLC ($6.55M), 6. Aegis.net, Inc. ($4.69M), 7. Dell Federal Systems L.P. ($4.31M), 8. Southwest Research Institute ($4.18M), 9. Verizon Communications Inc. ($4.02M), 10. AMG JV ($3.57M).

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