Top 100 Nuclear Regulatory Commission Contractors, FY2025

Name: Top 100 Nuclear Regulatory Commission Contractors, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Agency page on GovTribe

The top 10 won 49% of FY2025 Nuclear Regulatory Commission contract dollars

Contract obligations: $184,402,766 Net of deobligations, by the Nuclear Regulatory Commission and its offices
Contractors: 234 Parent companies with an obligation
Largest contractor: Teksynap Corporation $30.5 million, 16.1% 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	Teksynap Corporation Top NAICS codes 541512 Computer Systems Design Services	$30,501,876	16.1%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2024; unchanged since FY2024.
2	Leidos Holdings, Inc. Through Leidos, Inc. Top NAICS codes 541511 Custom Computer Programming Services	$16,509,855	8.7%	Rank history: #2 in FY2021, #2 in FY2022, #2 in FY2023 and #2 in FY2024; unchanged since FY2024.
3	Oasis Systems, LLC Top NAICS codes 541519 Other Computer Related Services	$10,329,162	5.5%	Rank history: #4 in FY2021, #4 in FY2022, #3 in FY2023 and #4 in FY2024; up 1 since FY2024.
4	Verizon 6 awardees, including Verizon Business Network Services LLC, Cellco Partnership and Verizon Pennsylvania LLC Top NAICS codes 517110 Wired Telecommunications Carriers 517111 Wired Telecommunications Carriers 517312 Wireless Telecommunications Carriers (except Satellite)	$7,296,240	3.9%	Rank history: not on the FY2021–FY2023 lists and #11 in FY2024; up 7 since FY2024.
5	CGI Federal Inc. Top NAICS codes 541519 Other Computer Related Services	$7,107,884	3.8%	Rank history: not on the FY2021–FY2023 lists and #3 in FY2024; down 2 since FY2024.
6	Dell Technologies Inc. 2 awardees, including Dell Federal Systems L.P and Dell Marketing L.P. Top NAICS codes 511210 Software Publishers	$5,056,980	2.7%	Rank history: not on the FY2021–FY2023 lists and #9 in FY2024; up 3 since FY2024.
7	Aegis.Net Inc Top NAICS codes 541519 Other Computer Related Services	$5,024,163	2.7%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2024; up 1 since FY2024.
8	Northramp LLC Top NAICS codes 541511 Custom Computer Programming Services	$3,737,088	2.0%	Rank history: #5 in FY2021, #9 in FY2022, #5 in FY2023 and #10 in FY2024; up 2 since FY2024.
9	Immersive Concepts L.L.C. Top NAICS codes 541519 Other Computer Related Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$3,573,175	1.9%	Rank history: #21 in FY2021, #16 in FY2022, #22 in FY2023 and #16 in FY2024; up 7 since FY2024.
10	Four LLC Top NAICS codes 541519 Other Computer Related Services	$3,334,903	1.8%	Rank history: #20 in FY2021, #29 in FY2022, #24 in FY2023 and #5 in FY2024; down 5 since FY2024.
11	ManTech International Corporation Through Unison Software Inc. Top NAICS codes 511210 Software Publishers	$3,000,000	1.6%	Rank history: not on the FY2021–FY2023 lists and #18 in FY2024; up 7 since FY2024.
12	Nve, Inc. Top NAICS codes 561210 Facilities Support Services	$2,955,080	1.6%	Rank history: not on the FY2021–FY2022 lists, #8 in FY2023 and #14 in FY2024; up 2 since FY2024.
13	Alvarez LLC Top NAICS codes 541519 Other Computer Related Services	$2,727,185	1.4%	Rank history: #71 in FY2021, #63 in FY2022 and not on the FY2023–FY2024 lists; up 147 since FY2024.
14	Huron Consulting Group Inc. Through Huron Consulting Services LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541511 Custom Computer Programming Services	$2,525,719	1.3%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2024; up 18 since FY2024.
15	Potomac Electric Power Co Top NAICS codes 221118 Other Electric Power Generation 221122 Electric Power Distribution	$2,489,079	1.3%	Rank history: not on the FY2021–FY2023 lists and #29 in FY2024; up 14 since FY2024.
16	CTG Federal, LLC Top NAICS codes 541519 Other Computer Related Services	$2,465,708	1.3%	Rank history: not on the FY2021–FY2022 lists, #23 in FY2023 and #19 in FY2024; up 3 since FY2024.
17	MCP Computer Products Inc. Top NAICS codes 334111 Electronic Computer Manufacturing	$2,372,834	1.3%	Rank history: #14 in FY2021, #7 in FY2022, #14 in FY2023 and #13 in FY2024; down 4 since FY2024.
18	Puyenpa Technologies LLC 2 awardees, including Puyenpa Services, LLC Top NAICS codes 541519 Other Computer Related Services 561621 Security Systems Services (except Locksmiths)	$2,202,659	1.2%	Rank history: not on the FY2021–FY2024 lists; new.
19	Gcr-Dean LLC Top NAICS codes 561210 Facilities Support Services	$2,188,800	1.2%	Rank history: not on the FY2021 list, #18 in FY2022, #17 in FY2023 and #21 in FY2024; up 2 since FY2024.
20	Hellmuth, Obata & Kassabaum, Inc. Top NAICS codes 541310 Architectural Services	$2,076,698	1.1%	Rank history: not on the FY2021–FY2023 lists and #61 in FY2024; up 41 since FY2024.
21	Southwest Research Institute Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541380 Testing Laboratories and Services	$1,888,802	1.0%	Rank history: #8 in FY2021, #11 in FY2022, #6 in FY2023 and #7 in FY2024; down 14 since FY2024.
22	DNI Emerging Technologies, LLC Top NAICS codes 541519 Other Computer Related Services	$1,850,946	1.0%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2024; up 6 since FY2024.
23	Portmanteau JV LLC Top NAICS codes 541512 Computer Systems Design Services	$1,833,000	1.0%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2024; up 13 since FY2024.
24	ATP Gov, LLC Top NAICS codes 541519 Other Computer Related Services	$1,831,580	1.0%	Rank history: not on the FY2021–FY2022 lists, #21 in FY2023 and not on the FY2024 list; returned.
25	Information Systems Laboratories, Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$1,811,177	1.0%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2024; down 10 since FY2024.
26	Mythics Inc. 2 awardees, including Emergent, LLC Top NAICS codes 541519 Other Computer Related Services	$1,786,802	0.9%	Rank history: #16 in FY2021, #20 in FY2022, #32 in FY2023 and #35 in FY2024; up 9 since FY2024.
27	Riva Solutions Inc Top NAICS codes 541614 Process, Physical Distribution, and Logistics Consulting Services	$1,663,982	0.9%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2024; up 63 since FY2024.
28	Dexian, LLC Through Disys Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$1,586,825	0.8%	Rank history: not on the FY2021–FY2023 lists and #88 in FY2024; up 60 since FY2024.
29	Translation Excellence Inc. Top NAICS codes 541930 Translation and Interpretation Services	$1,563,713	0.8%	Rank history: #99 in FY2021, #45 in FY2022, #50 in FY2023 and #40 in FY2024; up 11 since FY2024.
30	New TECH Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$1,509,646	0.8%	Rank history: #79 in FY2021, #51 in FY2022, #99 in FY2023 and #33 in FY2024; up 3 since FY2024.
31	Equinix LLC Top NAICS codes 541519 Other Computer Related Services	$1,441,484	0.8%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2024; up 69 since FY2024.
32	R I Solutions, LLC Top NAICS codes 541519 Other Computer Related Services	$1,384,872	0.7%	Rank history: not on the FY2021 list, #40 in FY2022, #25 in FY2023 and #17 in FY2024; down 15 since FY2024.
33	G2Sf LLC Top NAICS codes 541513 Computer Facilities Management Services	$1,366,907	0.7%	Rank history: #24 in FY2021, not on the FY2022–FY2023 lists and #57 in FY2024; up 24 since FY2024.
34	Oak Ridge Associated Universities, Incorporated Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,287,669	0.7%	Rank history: #36 in FY2021, #28 in FY2022, #37 in FY2023 and #22 in FY2024; down 12 since FY2024.
35	Sikich CPA LLC Top NAICS codes 541219 Other Accounting Services	$1,276,338	0.7%	Rank history: not on the FY2021–FY2024 lists; new.
36	Business Management Associates Inc. Top NAICS codes 541612 Human Resources Consulting Services	$1,149,000	0.6%	Rank history: #32 in FY2021, #30 in FY2022, #29 in FY2023 and #87 in FY2024; up 51 since FY2024.
37	Arctic Slope Regional Corporation Through Asrc Federal Data Networx, LLC Top NAICS codes 517919 All Other Telecommunications	$1,128,000	0.6%	Rank history: #43 in FY2021, not on the FY2022–FY2023 lists and #52 in FY2024; up 15 since FY2024.
38	Washington Metropolitan Area Transit Authority Top NAICS codes 485111 Mixed Mode Transit Systems	$1,113,444	0.6%	Rank history: not on the FY2021–FY2024 lists; up 96 since FY2024.
39	Software Information Resource Corp Top NAICS codes 541519 Other Computer Related Services	$1,108,218	0.6%	Rank history: not on the FY2021 list, #43 in FY2022, #36 in FY2023 and #80 in FY2024; up 41 since FY2024.
40	SD Solutions LLC Top NAICS codes 541618 Other Management Consulting Services	$1,075,000	0.6%	Rank history: #39 in FY2021, #81 in FY2022, #33 in FY2023 and #46 in FY2024; up 6 since FY2024.
41	Clark Baty Associates Inc. Top NAICS codes 541519 Other Computer Related Services	$1,049,190	0.6%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2023 and #44 in FY2024; up 3 since FY2024.
42	Renaissance Code Development LLC Top NAICS codes 541330 Engineering Services 541511 Custom Computer Programming Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$1,042,553	0.6%	Rank history: #82 in FY2021, #82 in FY2022, #46 in FY2023 and #79 in FY2024; up 37 since FY2024.
43	Thundercat Technology LLC Top NAICS codes 541519 Other Computer Related Services	$980,205	0.5%	Rank history: not on the FY2021–FY2022 lists, #42 in FY2023 and #30 in FY2024; down 13 since FY2024.
44	Advanced Systems Technology & Management, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$973,955	0.5%	Rank history: #13 in FY2021, #12 in FY2022, #9 in FY2023 and #12 in FY2024; down 32 since FY2024.
45	August Schell Enterprises, Inc. Top NAICS codes 541519 Other Computer Related Services	$967,942	0.5%	Rank history: #87 in FY2021, not on the FY2022 list, #95 in FY2023 and #67 in FY2024; up 22 since FY2024.
46	OCT Consulting LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$937,058	0.5%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023 and #82 in FY2024; up 36 since FY2024.
47	V3Gate, LLC Top NAICS codes 541519 Other Computer Related Services	$920,653	0.5%	Rank history: not on the FY2021 list, #73 in FY2022, #58 in FY2023 and #47 in FY2024; unchanged since FY2024.
48	Bahfed Corp Top NAICS codes 541519 Other Computer Related Services	$862,051	0.5%	Rank history: #44 in FY2021, not on the FY2022 list, #44 in FY2023 and #31 in FY2024; down 17 since FY2024.
49	Kikiktagruk Inupiat Corp Through Midnight Sun Technologies LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$858,831	0.5%	Rank history: #64 in FY2021, #48 in FY2022, #45 in FY2023 and not on the FY2024 list; up 123 since FY2024.
50	Cube Root Rk&K JV LLC Through Cube Root Corporation Top NAICS codes 541513 Computer Facilities Management Services	$805,000	0.4%	Rank history: not on the FY2021–FY2023 lists and #75 in FY2024; up 25 since FY2024.
51	Carahsoft Technology Corp Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 541519 Other Computer Related Services 511210 Software Publishers	$804,895	0.4%	Rank history: #54 in FY2021, #46 in FY2022, #48 in FY2023 and #37 in FY2024; down 14 since FY2024.
52	Infinetix Inc. Top NAICS codes 541519 Other Computer Related Services	$790,000	0.4%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023 and #25 in FY2024; down 27 since FY2024.
53	Union5 LLC Top NAICS codes 541519 Other Computer Related Services	$790,000	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
54	S C & A Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541620 Environmental Consulting Services	$786,970	0.4%	Rank history: #72 in FY2021 and not on the FY2022–FY2024 lists; up 72 since FY2024.
55	Project Performance Company, LLC Top NAICS codes 541511 Custom Computer Programming Services	$744,000	0.4%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2024; up 9 since FY2024.
56	Eagle Integrated Services, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$710,944	0.4%	Rank history: #46 in FY2021, #25 in FY2022, #30 in FY2023 and #39 in FY2024; down 17 since FY2024.
57	Koniag Management Solutions LLC Top NAICS codes 541519 Other Computer Related Services	$652,987	0.3%	Rank history: #26 in FY2021, #13 in FY2022, #15 in FY2023 and #26 in FY2024; down 31 since FY2024.
58	Avyance LLC Top NAICS codes 611710 Educational Support Services	$639,185	0.3%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2024; up 28 since FY2024.
59	At&T Inc. 3 awardees, including At&T Enterprises, LLC and Att Mobility LLC Top NAICS codes 517110 Wired Telecommunications Carriers 517312 Wireless Telecommunications Carriers (except Satellite) 517112 Wireless Telecommunications Carriers (except Satellite)	$621,679	0.3%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2024; up 3 since FY2024.
60	Numark Associates, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 541690 Other Scientific and Technical Consulting Services	$600,292	0.3%	Rank history: #56 in FY2021, #75 in FY2022, #31 in FY2023 and #51 in FY2024; down 9 since FY2024.
61	Ansys Inc. Top NAICS codes 513210 Software Publishers	$583,414	0.3%	Rank history: not on the FY2021–FY2024 lists; up 88 since FY2024.
62	Cape Fox Corporation 2 awardees, including Eagle Health, LLC Top NAICS codes 621498 All Other Outpatient Care Centers	$557,980	0.3%	Rank history: #34 in FY2021, not on the FY2022–FY2023 lists and #69 in FY2024; up 7 since FY2024.
63	Exitech Corporation Top NAICS codes 541519 Other Computer Related Services	$550,000	0.3%	Rank history: #66 in FY2021, #79 in FY2022, #70 in FY2023 and #73 in FY2024; up 10 since FY2024.
64	Advanced Computer Concepts, Inc. Top NAICS codes 541519 Other Computer Related Services	$548,499	0.3%	Rank history: #52 in FY2021 and not on the FY2022–FY2024 lists; up 175 since FY2024.
65	Beckman & Associates Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$541,000	0.3%	Rank history: #74 in FY2021, #35 in FY2022, #61 in FY2023 and #68 in FY2024; up 3 since FY2024.
66	Semanticbits LLC Through ICF Incorporated, L.L.C. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541611 Administrative Management and General Management Consulting Services	$526,411	0.3%	Rank history: not on the FY2021–FY2023 lists and #43 in FY2024; down 23 since FY2024.
67	Engineering Mechanics Corporation of Columbus Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$509,649	0.3%	Rank history: #41 in FY2021, #41 in FY2022, #68 in FY2023 and #48 in FY2024; down 19 since FY2024.
68	Green Powered Technology LLC Top NAICS codes 561410 Document Preparation Services	$490,676	0.3%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023 and #76 in FY2024; up 8 since FY2024.
69	Sault Tribe Government Solutions, LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$480,000	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
70	Tyson Project Management Group LLC Top NAICS codes 561210 Facilities Support Services	$460,000	0.2%	Rank history: not on the FY2021 list, #86 in FY2022, #83 in FY2023 and #54 in FY2024; down 16 since FY2024.
71	Techop Solutions International, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$415,060	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
72	Code Plus, Inc. Top NAICS codes 541511 Custom Computer Programming Services	$399,000	0.2%	Rank history: #48 in FY2021, #32 in FY2022, #35 in FY2023 and #41 in FY2024; down 31 since FY2024.
73	The Pennsylvania State University Top NAICS codes 611310 Colleges, Universities, and Professional Schools	$372,418	0.2%	Rank history: #65 in FY2021, #72 in FY2022, #77 in FY2023 and #53 in FY2024; down 20 since FY2024.
74	Capital Brand Group LLC Top NAICS codes 561730 Landscaping Services	$366,000	0.2%	Rank history: not on the FY2021–FY2024 lists; up 31 since FY2024.
75	Assyst Inc. Top NAICS codes 541519 Other Computer Related Services	$355,968	0.2%	Rank history: not on the FY2021–FY2023 lists and #95 in FY2024; up 20 since FY2024.
76	Accessagility LLC Top NAICS codes 541519 Other Computer Related Services	$344,527	0.2%	Rank history: not on the FY2021–FY2024 lists; up 80 since FY2024.
77	Comcast of Connecticut Inc 2 awardees, including Comcast Business Communications, LLC Top NAICS codes 517110 Wired Telecommunications Carriers	$326,641	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
78	Afm, LLC Top NAICS codes 519190 All Other Information Services	$323,000	0.2%	Rank history: #90 in FY2021, #69 in FY2022, not on the FY2023 list and #78 in FY2024; unchanged since FY2024.
79	Pathfinder Consultants, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$319,754	0.2%	Rank history: #68 in FY2021, #76 in FY2022, #72 in FY2023 and #58 in FY2024; down 21 since FY2024.
80	Washington Suburban Sanitary Commission Top NAICS codes 221310 Water Supply and Irrigation Systems	$310,958	0.2%	Rank history: not on the FY2021–FY2024 lists; up 125 since FY2024.
81	Aquila Fitness Consulting Systems Ltd Top NAICS codes 713940 Fitness and Recreational Sports Centers	$300,831	0.2%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and not on the FY2024 list; up 42 since FY2024.
82	Forensic Drug & Alcohol Testing LLC Top NAICS codes 621999 All Other Miscellaneous Ambulatory Health Care Services	$300,000	0.2%	Rank history: not on the FY2021–FY2024 lists; up 61 since FY2024.
83	The Educe Group Inc. Top NAICS codes 541511 Custom Computer Programming Services	$290,900	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
84	Colossal Contracting LLC Top NAICS codes 541519 Other Computer Related Services	$289,557	0.2%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023 and not on the FY2024 list; up 176 since FY2024.
85	Universal Parking and Transportation LLC Top NAICS codes 812930 Parking Lots and Garages	$286,000	0.2%	Rank history: not on the FY2021–FY2024 lists; up 22 since FY2024.
86	Countertrade Products, Inc. Top NAICS codes 541519 Other Computer Related Services	$285,991	0.2%	Rank history: not on the FY2021–FY2022 lists, #93 in FY2023 and not on the FY2024 list; returned.
87	LPS Aqiwo 8A JV LLC Top NAICS codes 541512 Computer Systems Design Services	$282,065	0.1%	Rank history: not on the FY2021–FY2024 lists; up 17 since FY2024.
88	Clason Point Partners Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$275,057	0.1%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023 and not on the FY2024 list; up 24 since FY2024.
89	Crowe LLP Top NAICS codes 522310 Mortgage and Nonmortgage Loan Brokers	$268,552	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
90	Standard-Blazar, LLC Top NAICS codes 541519 Other Computer Related Services	$265,880	0.1%	Rank history: not on the FY2021–FY2023 lists and #56 in FY2024; down 34 since FY2024.
91	Enterprise Technology Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$255,938	0.1%	Rank history: #49 in FY2021, #50 in FY2022, #53 in FY2023 and #94 in FY2024; up 3 since FY2024.
92	Consovoy Mccarthy, PLLC Top NAICS codes 541199 All Other Legal Services	$250,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
93	Architechture Solutions LLC Top NAICS codes 541519 Other Computer Related Services	$249,198	0.1%	Rank history: not on the FY2021–FY2024 lists; up 36 since FY2024.
94	Barbaricum LLC Top NAICS codes 541511 Custom Computer Programming Services	$243,882	0.1%	Rank history: not on the FY2021–FY2024 lists; up 56 since FY2024.
95	Schindler Elevator Corporation Top NAICS codes 811310 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance	$241,971	0.1%	Rank history: not on the FY2021–FY2024 lists; up 26 since FY2024.
96	H.e.p. Construction, Inc. Top NAICS codes 561210 Facilities Support Services	$240,000	0.1%	Rank history: not on the FY2021–FY2024 lists; up 26 since FY2024.
97	Red Heritage Media LLC Top NAICS codes 561410 Document Preparation Services 611430 Professional and Management Development Training	$238,700	0.1%	Rank history: #57 in FY2021, #85 in FY2022, #57 in FY2023 and not on the FY2024 list; up 89 since FY2024.
98	Energy Research Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$234,198	0.1%	Rank history: not on the FY2021 list, #66 in FY2022, #28 in FY2023 and #34 in FY2024; down 64 since FY2024.
99	Dynamic Business Group, Inc. Top NAICS codes 519190 All Other Information Services	$227,893	0.1%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and not on the FY2024 list; up 29 since FY2024.
100	Regents of the University of Michigan Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$220,000	0.1%	Rank history: #69 in FY2021, not on the FY2022 list, #87 in FY2023 and #97 in FY2024; down 3 since FY2024.

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100 of 234 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 $189 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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 FY2025?

1. Teksynap Corporation ($30.5M), 2. Leidos Holdings, Inc. ($16.5M), 3. Oasis Systems, LLC ($10.3M), 4. Verizon ($7.3M), 5. CGI Federal Inc. ($7.11M), 6. Dell Technologies Inc. ($5.06M), 7. Aegis.Net Inc ($5.02M), 8. Northramp LLC ($3.74M), 9. Immersive Concepts L.L.C. ($3.57M), 10. Four LLC ($3.33M).

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