Top 100 Nuclear Regulatory Commission Contractors, Aug 2025–Jul 2026

Name: Top 100 Nuclear Regulatory Commission Contractors, Aug 2025–Jul 2026
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Aug 1, 2025 – Jul 31, 2026 Agency page on GovTribe

The latest 12 months. See the newest fiscal year's list: Top Nuclear Regulatory Commission Contractors, FY2025.

The top 10 won 50% of Nuclear Regulatory Commission contract dollars from August 2025 through July 2026

Contract obligations: $209,242,563 Net of deobligations, by the Nuclear Regulatory Commission and its offices
Contractors: 210 Parent companies with an obligation
Largest contractor: Teksynap Corporation $42.4 million, 20.0% of obligations
Data as of: Nov 5, 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	$42,375,760	20.0%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since Aug 2024–Jul 2025.
2	Leidos Holdings, Inc. Through Leidos, Inc. Top NAICS codes 541511 Custom Computer Programming Services	$12,145,825	5.7%	Rank history: #2 in FY2021, #2 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since Aug 2024–Jul 2025.
3	Astrion Group, LLC 2 awardees, including Oasis Systems, LLC Top NAICS codes 541519 Other Computer Related Services	$11,943,074	5.6%	Rank history: not on the FY2021–FY2024 lists and #3 in FY2025; new, not ranked in Aug 2024–Jul 2025.
4	The Timken Company Through CGI Federal Inc. Top NAICS codes 541519 Other Computer Related Services	$9,958,090	4.7%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
5	MCP Computer Products Inc. Top NAICS codes 334111 Electronic Computer Manufacturing	$6,901,039	3.3%	Rank history: #14 in FY2021, #7 in FY2022, #14 in FY2023, #13 in FY2024 and #17 in FY2025; up 7 since Aug 2024–Jul 2025.
6	Dell Technologies Inc. 2 awardees, including Dell Federal Systems L.P Top NAICS codes 511210 Software Publishers	$5,805,548	2.7%	Rank history: not on the FY2021–FY2023 lists, #9 in FY2024 and #6 in FY2025; up 2 since Aug 2024–Jul 2025.
7	Nve, Inc. Top NAICS codes 561210 Facilities Support Services	$5,587,503	2.6%	Rank history: not on the FY2021–FY2022 lists, #8 in FY2023, #14 in FY2024 and #12 in FY2025; up 19 since Aug 2024–Jul 2025.
8	ManTech International Corporation 2 awardees, including Unison Software Inc. and Unison Virtual Acquisition Office LLC Top NAICS codes 511210 Software Publishers	$3,917,738	1.8%	Rank history: not on the FY2021–FY2023 lists, #18 in FY2024 and #11 in FY2025; up 3 since Aug 2024–Jul 2025.
9	Aegis.Net Inc Top NAICS codes 541519 Other Computer Related Services	$3,801,309	1.8%	Rank history: not on the FY2021–FY2023 lists, #8 in FY2024 and #7 in FY2025; up 1 since Aug 2024–Jul 2025.
10	Northramp LLC Top NAICS codes 541511 Custom Computer Programming Services	$3,480,766	1.6%	Rank history: #5 in FY2021, #9 in FY2022, #5 in FY2023, #10 in FY2024 and #8 in FY2025; down 1 since Aug 2024–Jul 2025.
11	Verizon 7 awardees, including Verizon Business Network Services LLC, Verizon Pennsylvania LLC and Verizon Communications Inc. Top NAICS codes 517110 Wired Telecommunications Carriers 517111 Wired Telecommunications Carriers	$3,377,082	1.6%	Rank history: not on the FY2021–FY2023 lists, #11 in FY2024 and #4 in FY2025; down 4 since Aug 2024–Jul 2025.
12	CTG Federal, LLC Top NAICS codes 541519 Other Computer Related Services	$3,267,176	1.5%	Rank history: not on the FY2021–FY2022 lists, #23 in FY2023, #19 in FY2024 and #16 in FY2025; up 4 since Aug 2024–Jul 2025.
13	Puyenpa Technologies LLC Top NAICS codes 541519 Other Computer Related Services	$3,223,959	1.5%	Rank history: not on the FY2021–FY2024 lists and #18 in FY2025; up 33 since Aug 2024–Jul 2025.
14	Dexian, LLC Through Disys Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$3,036,055	1.4%	Rank history: not on the FY2021–FY2023 lists, #88 in FY2024 and #28 in FY2025; up 55 since Aug 2024–Jul 2025.
15	Advanced Systems Technology & Management, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$3,016,375	1.4%	Rank history: #13 in FY2021, #12 in FY2022, #9 in FY2023, #12 in FY2024 and #44 in FY2025; new, not ranked in Aug 2024–Jul 2025.
16	Immersive Concepts L.L.C. Top NAICS codes 541519 Other Computer Related Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$2,936,856	1.4%	Rank history: #21 in FY2021, #16 in FY2022, #22 in FY2023, #16 in FY2024 and #9 in FY2025; down 3 since Aug 2024–Jul 2025.
17	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	$2,802,882	1.3%	Rank history: #8 in FY2021, #11 in FY2022, #6 in FY2023, #7 in FY2024 and #21 in FY2025; down 12 since Aug 2024–Jul 2025.
18	DNI Emerging Technologies, LLC Top NAICS codes 541519 Other Computer Related Services	$2,754,946	1.3%	Rank history: not on the FY2021–FY2023 lists, #28 in FY2024 and #22 in FY2025; up 9 since Aug 2024–Jul 2025.
19	Government Contracting Resources, Inc. Through Gcr-Dean LLC Top NAICS codes 561210 Facilities Support Services	$2,713,357	1.3%	Rank history: not on the FY2021–FY2024 lists and #19 in FY2025; new, not ranked in Aug 2024–Jul 2025.
20	Potomac Electric Power Co Top NAICS codes 221118 Other Electric Power Generation	$2,635,097	1.2%	Rank history: not on the FY2021–FY2024 lists and #15 in FY2025; new, not ranked in Aug 2024–Jul 2025.
21	CGI Federal Inc. Top NAICS codes 541519 Other Computer Related Services	$2,517,381	1.2%	Rank history: not on the FY2021–FY2023 lists, #3 in FY2024 and #5 in FY2025; down 18 since Aug 2024–Jul 2025.
22	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	$2,513,297	1.2%	Rank history: not on the FY2021–FY2023 lists, #32 in FY2024 and #14 in FY2025; down 8 since Aug 2024–Jul 2025.
23	Four LLC Top NAICS codes 541519 Other Computer Related Services	$2,278,701	1.1%	Rank history: #20 in FY2021, #29 in FY2022, #24 in FY2023, #5 in FY2024 and #10 in FY2025; down 17 since Aug 2024–Jul 2025.
24	Portmanteau JV LLC Top NAICS codes 541512 Computer Systems Design Services	$1,990,842	0.9%	Rank history: not on the FY2021–FY2023 lists, #36 in FY2024 and #23 in FY2025; up 28 since Aug 2024–Jul 2025.
25	Cube Root Rk&K JV LLC Through Cube Root Corporation Top NAICS codes 541513 Computer Facilities Management Services	$1,883,000	0.9%	Rank history: not on the FY2021–FY2023 lists, #75 in FY2024 and #50 in FY2025; up 50 since Aug 2024–Jul 2025.
26	Riva Solutions Inc Top NAICS codes 541614 Process, Physical Distribution, and Logistics Consulting Services	$1,881,849	0.9%	Rank history: not on the FY2021–FY2023 lists, #90 in FY2024 and #27 in FY2025; up 30 since Aug 2024–Jul 2025.
27	Mythics Inc. 2 awardees, including Emergent, LLC Top NAICS codes 541519 Other Computer Related Services	$1,792,802	0.8%	Rank history: #16 in FY2021, #20 in FY2022, #32 in FY2023, #35 in FY2024 and #25 in FY2025; up 3 since Aug 2024–Jul 2025.
28	Sault Tribe Government Solutions, LLC Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$1,672,157	0.8%	Rank history: not on the FY2021–FY2024 lists and #69 in FY2025; new, not ranked in Aug 2024–Jul 2025.
29	Regency Consulting Inc Top NAICS codes 541519 Other Computer Related Services	$1,594,562	0.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
30	Oak Ridge Associated Universities, Incorporated Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$1,527,403	0.7%	Rank history: #36 in FY2021, #28 in FY2022, #37 in FY2023, #22 in FY2024 and #34 in FY2025; up 4 since Aug 2024–Jul 2025.
31	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	$1,505,836	0.7%	Rank history: #54 in FY2021, #46 in FY2022, #48 in FY2023, #37 in FY2024 and #51 in FY2025; up 18 since Aug 2024–Jul 2025.
32	Numark Associates, Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 541690 Other Scientific and Technical Consulting Services	$1,422,050	0.7%	Rank history: #56 in FY2021, #75 in FY2022, #31 in FY2023, #51 in FY2024 and #60 in FY2025; up 47 since Aug 2024–Jul 2025.
33	New TECH Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$1,390,603	0.7%	Rank history: #79 in FY2021, #51 in FY2022, #99 in FY2023, #33 in FY2024 and #30 in FY2025; down 5 since Aug 2024–Jul 2025.
34	Information Systems Laboratories Inc. 3 awardees Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$1,385,669	0.7%	Rank history: #17 in FY2021, #19 in FY2022, #11 in FY2023, not on the FY2024 list and #26 in FY2025; new, not ranked in Aug 2024–Jul 2025.
35	Equinix LLC Top NAICS codes 541519 Other Computer Related Services	$1,365,165	0.6%	Rank history: not on the FY2021–FY2023 lists, #100 in FY2024 and #31 in FY2025; up 53 since Aug 2024–Jul 2025.
36	Infinetix Inc. Top NAICS codes 541519 Other Computer Related Services	$1,352,000	0.6%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023, #25 in FY2024 and #52 in FY2025; down 15 since Aug 2024–Jul 2025.
37	G2Sf LLC Top NAICS codes 541513 Computer Facilities Management Services	$1,347,907	0.6%	Rank history: not on the FY2021–FY2024 lists and #33 in FY2025; new, not ranked in Aug 2024–Jul 2025.
38	Arctic Slope Regional Corporation Through Asrc Federal Data Networx, LLC Top NAICS codes 517919 All Other Telecommunications	$1,340,669	0.6%	Rank history: #43 in FY2021, not on the FY2022–FY2023 lists, #52 in FY2024 and #37 in FY2025; up 3 since Aug 2024–Jul 2025.
39	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)	$1,320,927	0.6%	Rank history: #82 in FY2021, #82 in FY2022, #46 in FY2023, #79 in FY2024 and #42 in FY2025; up 16 since Aug 2024–Jul 2025.
40	Software Information Resource Corp Top NAICS codes 541519 Other Computer Related Services	$1,279,959	0.6%	Rank history: not on the FY2021 list, #43 in FY2022, #36 in FY2023, #80 in FY2024 and #39 in FY2025; up 34 since Aug 2024–Jul 2025.
41	Alvarez LLC Top NAICS codes 541519 Other Computer Related Services	$1,274,611	0.6%	Rank history: #71 in FY2021, #63 in FY2022, not on the FY2023–FY2024 lists and #13 in FY2025; down 26 since Aug 2024–Jul 2025.
42	Translation Excellence Inc. Top NAICS codes 541930 Translation and Interpretation Services	$1,177,976	0.6%	Rank history: #99 in FY2021, #45 in FY2022, #50 in FY2023, #40 in FY2024 and #29 in FY2025; down 9 since Aug 2024–Jul 2025.
43	SD Solutions LLC Top NAICS codes 541618 Other Management Consulting Services	$1,160,276	0.5%	Rank history: #39 in FY2021, #81 in FY2022, #33 in FY2023, #46 in FY2024 and #40 in FY2025; down 6 since Aug 2024–Jul 2025.
44	Data Systems Analysts Inc. 2 awardees, including Project Performance Company, LLC Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services	$1,122,100	0.5%	Rank history: #42 in FY2021, #33 in FY2022, #38 in FY2023, #99 in FY2024 and #55 in FY2025; new, not ranked in Aug 2024–Jul 2025.
45	Sikich CPA LLC Top NAICS codes 541219 Other Accounting Services	$1,069,356	0.5%	Rank history: not on the FY2021–FY2024 lists and #35 in FY2025; down 9 since Aug 2024–Jul 2025.
46	ICF International Inc. 2 awardees, including ICF Incorporated, L.L.C. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541611 Administrative Management and General Management Consulting Services	$995,851	0.5%	Rank history: not on the FY2021–FY2023 lists, #43 in FY2024 and #66 in FY2025; down 17 since Aug 2024–Jul 2025.
47	Thundercat Technology LLC Top NAICS codes 541519 Other Computer Related Services	$992,616	0.5%	Rank history: not on the FY2021–FY2022 lists, #42 in FY2023, #30 in FY2024 and #43 in FY2025; down 2 since Aug 2024–Jul 2025.
48	V3Gate, LLC Top NAICS codes 541519 Other Computer Related Services	$946,260	0.4%	Rank history: not on the FY2021 list, #73 in FY2022, #58 in FY2023, #47 in FY2024 and #47 in FY2025; down 10 since Aug 2024–Jul 2025.
49	August Schell Enterprises, Inc. Top NAICS codes 541519 Other Computer Related Services	$943,809	0.4%	Rank history: #87 in FY2021, not on the FY2022 list, #95 in FY2023, #67 in FY2024 and #45 in FY2025; up 27 since Aug 2024–Jul 2025.
50	Tyson Project Management Group LLC Top NAICS codes 561210 Facilities Support Services	$911,000	0.4%	Rank history: not on the FY2021 list, #86 in FY2022, #83 in FY2023, #54 in FY2024 and #70 in FY2025; up 30 since Aug 2024–Jul 2025.
51	Business Management Associates Inc. Top NAICS codes 541612 Human Resources Consulting Services 541519 Other Computer Related Services	$904,811	0.4%	Rank history: #32 in FY2021, #30 in FY2022, #29 in FY2023, #87 in FY2024 and #36 in FY2025; down 26 since Aug 2024–Jul 2025.
52	Bahfed Corp Top NAICS codes 541519 Other Computer Related Services	$862,051	0.4%	Rank history: #44 in FY2021, not on the FY2022 list, #44 in FY2023, #31 in FY2024 and #48 in FY2025; down 12 since Aug 2024–Jul 2025.
53	Washington Metropolitan Area Transit Authority Top NAICS codes 485111 Mixed Mode Transit Systems	$834,000	0.4%	Rank history: not on the FY2021–FY2024 lists and #38 in FY2025; up 39 since Aug 2024–Jul 2025.
54	OCT Consulting LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$830,849	0.4%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023, #82 in FY2024 and #46 in FY2025; down 11 since Aug 2024–Jul 2025.
55	Kikiktagruk Inupiat Corp Through Midnight Sun Technologies LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$818,831	0.4%	Rank history: #64 in FY2021, #48 in FY2022, #45 in FY2023, not on the FY2024 list and #49 in FY2025; up 10 since Aug 2024–Jul 2025.
56	Advanced Computer Concepts, Inc. Top NAICS codes 541519 Other Computer Related Services	$815,897	0.4%	Rank history: #52 in FY2021, not on the FY2022–FY2024 lists and #64 in FY2025; new, not ranked in Aug 2024–Jul 2025.
57	R I Solutions, LLC Top NAICS codes 541519 Other Computer Related Services	$796,565	0.4%	Rank history: not on the FY2021 list, #40 in FY2022, #25 in FY2023, #17 in FY2024 and #32 in FY2025; down 38 since Aug 2024–Jul 2025.
58	Avyance LLC Top NAICS codes 611710 Educational Support Services	$750,326	0.4%	Rank history: not on the FY2021–FY2023 lists, #86 in FY2024 and #58 in FY2025; down 5 since Aug 2024–Jul 2025.
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)	$661,517	0.3%	Rank history: not on the FY2021–FY2023 lists, #62 in FY2024 and #59 in FY2025; up 90 since Aug 2024–Jul 2025.
60	LPS Aqiwo 8A JV LLC Top NAICS codes 541512 Computer Systems Design Services	$606,459	0.3%	Rank history: not on the FY2021–FY2024 lists and #87 in FY2025; up 13 since Aug 2024–Jul 2025.
61	Synopsys, Inc. Through Ansys Inc. Top NAICS codes 513210 Software Publishers	$587,991	0.3%	Rank history: not on the FY2021–FY2024 lists and #61 in FY2025; new, not ranked in Aug 2024–Jul 2025.
62	AFG Group Inc. Top NAICS codes 541330 Engineering Services	$583,098	0.3%	Rank history: not on the FY2021 list, #77 in FY2022 and not on the FY2023–FY2025 lists; up 56 since Aug 2024–Jul 2025.
63	The Educe Group Inc. Top NAICS codes 541511 Custom Computer Programming Services	$581,800	0.3%	Rank history: not on the FY2021–FY2024 lists and #83 in FY2025; new, not ranked in Aug 2024–Jul 2025.
64	Union5 LLC Top NAICS codes 541519 Other Computer Related Services	$559,500	0.3%	Rank history: not on the FY2021–FY2024 lists and #53 in FY2025; up 3 since Aug 2024–Jul 2025.
65	Clark Baty Associates Inc. Top NAICS codes 541512 Computer Systems Design Services	$544,748	0.3%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2023, #44 in FY2024 and #41 in FY2025; down 30 since Aug 2024–Jul 2025.
66	Code Plus, Inc. Top NAICS codes 541511 Custom Computer Programming Services	$503,054	0.2%	Rank history: #48 in FY2021, #32 in FY2022, #35 in FY2023, #41 in FY2024 and #72 in FY2025; up 33 since Aug 2024–Jul 2025.
67	Cape Fox Corporation 2 awardees, including Eagle Health, LLC and Wolf Lake Services, LLC Top NAICS codes 621498 All Other Outpatient Care Centers 621493 Freestanding Ambulatory Surgical and Emergency Centers	$498,425	0.2%	Rank history: #34 in FY2021, not on the FY2022–FY2023 lists, #69 in FY2024 and #62 in FY2025; up 23 since Aug 2024–Jul 2025.
68	Institute of Nuclear Power Operations, Inc. Top NAICS codes 541330 Engineering Services	$484,951	0.2%	Rank history: #73 in FY2021, #70 in FY2022, #79 in FY2023, #50 in FY2024 and not on the FY2025 list; up 74 since Aug 2024–Jul 2025.
69	Energy Research Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541712 Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)	$483,979	0.2%	Rank history: not on the FY2021 list, #66 in FY2022, #28 in FY2023, #34 in FY2024 and #98 in FY2025; down 11 since Aug 2024–Jul 2025.
70	Capital Brand Group LLC Top NAICS codes 561730 Landscaping Services	$458,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #74 in FY2025; up 33 since Aug 2024–Jul 2025.
71	Bristol Bay Native Corporation Through Eagle Integrated Services, LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$445,249	0.2%	Rank history: not on the FY2021–FY2024 lists and #56 in FY2025; new, not ranked in Aug 2024–Jul 2025.
72	Centeva LLC Top NAICS codes 541519 Other Computer Related Services 541611 Administrative Management and General Management Consulting Services	$434,220	0.2%	Rank history: not on the FY2021–FY2025 lists; up 78 since Aug 2024–Jul 2025.
73	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 and #71 in FY2025; new, not ranked in Aug 2024–Jul 2025.
74	Universal Parking and Transportation LLC Top NAICS codes 812930 Parking Lots and Garages	$393,394	0.2%	Rank history: not on the FY2021–FY2024 lists and #85 in FY2025; up 21 since Aug 2024–Jul 2025.
75	Forensic Drug & Alcohol Testing LLC Top NAICS codes 621999 All Other Miscellaneous Ambulatory Health Care Services	$380,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #82 in FY2025; up 46 since Aug 2024–Jul 2025.
76	Accessagility LLC Top NAICS codes 541519 Other Computer Related Services	$372,563	0.2%	Rank history: not on the FY2021–FY2024 lists and #76 in FY2025; up 49 since Aug 2024–Jul 2025.
77	Hellmuth, Obata & Kassabaum, Inc. Top NAICS codes 541310 Architectural Services	$347,882	0.2%	Rank history: not on the FY2021–FY2023 lists, #61 in FY2024 and #20 in FY2025; down 55 since Aug 2024–Jul 2025.
78	Clason Point Partners Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$333,798	0.2%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023, not on the FY2024 list and #88 in FY2025; down 1 since Aug 2024–Jul 2025.
79	Aspen Systems, Inc. Top NAICS codes 811212 Computer and Office Machine Repair and Maintenance	$327,391	0.2%	Rank history: not on the FY2021–FY2023 lists, #92 in FY2024 and not on the FY2025 list; down 1 since Aug 2024–Jul 2025.
80	Redhawk It Solutions, LLC Top NAICS codes 541519 Other Computer Related Services	$310,657	0.1%	Rank history: not on the FY2021 list, #64 in FY2022, #62 in FY2023, #89 in FY2024 and not on the FY2025 list; up 6 since Aug 2024–Jul 2025.
81	Sterling Computers Corporation Top NAICS codes 334111 Electronic Computer Manufacturing 541519 Other Computer Related Services	$310,331	0.1%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
82	The Building People LLC Top NAICS codes 541511 Custom Computer Programming Services	$286,000	0.1%	Rank history: not on the FY2021–FY2022 lists, #41 in FY2023 and not on the FY2024–FY2025 lists; up 42 since Aug 2024–Jul 2025.
83	Architechture Solutions LLC Top NAICS codes 541519 Other Computer Related Services	$285,575	0.1%	Rank history: not on the FY2021–FY2024 lists and #93 in FY2025; up 14 since Aug 2024–Jul 2025.
84	Colossal Contracting LLC Top NAICS codes 541519 Other Computer Related Services	$277,168	0.1%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023, not on the FY2024 list and #84 in FY2025; up 137 since Aug 2024–Jul 2025.
85	Aquila Fitness Consulting Systems Ltd Top NAICS codes 713940 Fitness and Recreational Sports Centers	$272,875	0.1%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023, not on the FY2024 list and #81 in FY2025; up 21 since Aug 2024–Jul 2025.
86	Standard-Blazar, LLC Top NAICS codes 541519 Other Computer Related Services	$265,880	0.1%	Rank history: not on the FY2021–FY2023 lists, #56 in FY2024 and #90 in FY2025; down 38 since Aug 2024–Jul 2025.
87	S C & A Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541620 Environmental Consulting Services	$258,629	0.1%	Rank history: #72 in FY2021, not on the FY2022–FY2024 lists and #54 in FY2025; down 45 since Aug 2024–Jul 2025.
88	Enterprise Technology Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$255,619	0.1%	Rank history: #49 in FY2021, #50 in FY2022, #53 in FY2023, #94 in FY2024 and #91 in FY2025; up 6 since Aug 2024–Jul 2025.
89	Chainbridge Solutions Incorporated Top NAICS codes 541511 Custom Computer Programming Services	$249,590	0.1%	Rank history: #51 in FY2021, #59 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; up 28 since Aug 2024–Jul 2025.
90	Price Modern LLC Top NAICS codes 337214 Office Furniture (except Wood) Manufacturing	$243,267	0.1%	Rank history: #22 in FY2021, #44 in FY2022, #69 in FY2023, #60 in FY2024 and not on the FY2025 list; down 36 since Aug 2024–Jul 2025.
91	Schindler Elevator Corporation Top NAICS codes 811310 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance	$243,241	0.1%	Rank history: not on the FY2021–FY2024 lists and #95 in FY2025; up 10 since Aug 2024–Jul 2025.
92	H.e.p. Construction, Inc. Top NAICS codes 561210 Facilities Support Services	$242,000	0.1%	Rank history: not on the FY2021–FY2024 lists and #96 in FY2025; up 13 since Aug 2024–Jul 2025.
93	Countertrade Products, Inc. Top NAICS codes 541519 Other Computer Related Services	$239,330	0.1%	Rank history: not on the FY2021–FY2022 lists, #93 in FY2023, not on the FY2024 list and #86 in FY2025; up 84 since Aug 2024–Jul 2025.
94	Otis Elevator Company Top NAICS codes 811310 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance	$234,444	0.1%	Rank history: not on the FY2021–FY2025 lists; up 14 since Aug 2024–Jul 2025.
95	Afm, LLC Top NAICS codes 519190 All Other Information Services	$229,000	0.1%	Rank history: #90 in FY2021, #69 in FY2022, not on the FY2023 list, #78 in FY2024 and #78 in FY2025; down 10 since Aug 2024–Jul 2025.
96	BDR Solutions, LLC Top NAICS codes 541618 Other Management Consulting Services	$227,000	0.1%	Rank history: not on the FY2021–FY2025 lists; up 15 since Aug 2024–Jul 2025.
97	Consovoy Mccarthy, PLLC Top NAICS codes 541199 All Other Legal Services	$226,714	0.1%	Rank history: not on the FY2021–FY2024 lists and #92 in FY2025; new, not ranked in Aug 2024–Jul 2025.
98	Koniag, Inc. Through Koniag Management Solutions LLC Top NAICS codes 541519 Other Computer Related Services	$223,558	0.1%	Rank history: not on the FY2021–FY2024 lists and #57 in FY2025; new, not ranked in Aug 2024–Jul 2025.
99	Skillsoft (Us) LLC Top NAICS codes 511210 Software Publishers	$214,311	0.1%	Rank history: not on the FY2021–FY2025 lists; up 14 since Aug 2024–Jul 2025.
100	Assyst Inc. Top NAICS codes 541519 Other Computer Related Services	$208,637	0.1%	Rank history: not on the FY2021–FY2023 lists, #95 in FY2024 and #75 in FY2025; down 43 since Aug 2024–Jul 2025.

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100 of 210 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 $212 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Aug 2024–Jul 2025. "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.
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 Aug 2025–Jul 2026?

1. Teksynap Corporation ($42.4M), 2. Leidos Holdings, Inc. ($12.1M), 3. Astrion Group, LLC ($11.9M), 4. The Timken Company ($9.96M), 5. MCP Computer Products Inc. ($6.9M), 6. Dell Technologies Inc. ($5.81M), 7. Nve, Inc. ($5.59M), 8. ManTech International Corporation ($3.92M), 9. Aegis.Net Inc ($3.8M), 10. Northramp LLC ($3.48M).

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