Top 100 Contractors in NAICS 8139: Business, Professional, Labor, Political, and Similar Organizations, FY2024

Name: Top 100 Contractors in NAICS 8139: Business, Professional, Labor, Political, and Similar Organizations, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 58% of FY2024 NAICS 8139 contract dollars

Contract obligations: $131,367,177 Net of deobligations, by contracts coded NAICS 8139 or a code under it
Contractors: 420 Parent companies with an obligation
Largest contractor: General Dynamics Corporation $27.9 million, 20.1% 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	General Dynamics Corporation Through General Dynamics Information Technology, Inc. Top agencies DHA (Defense Health Agency) Army (Department of the Army) USAF (Department of the Air Force)	$27,884,376	20.1%	Rank history: not on the FY2021 list, #1 in FY2022, #1 in FY2023 and #1 in FY2025; unchanged since FY2023.
2	Joint Commission On Accreditation of Healthcare Organizations Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$20,148,132	14.5%	Rank history: #1 in FY2021, #2 in FY2022, #2 in FY2023 and #2 in FY2025; unchanged since FY2023.
3	Quality Insights, Inc. Top agencies VA (Department of Veterans Affairs)	$11,186,909	8.1%	Rank history: not on the FY2021–FY2023 lists and #3 in FY2025; new.
4	Nevada System of Higher Education Top agencies Commerce (Department of Commerce)	$5,242,209	3.8%	Rank history: not on the FY2021 list, #33 in FY2022, not on the FY2023 list and #8 in FY2025; returned.
5	Commission On Accreditation of Rehabilitation Facilities Top agencies VA (Department of Veterans Affairs)	$2,947,653	2.1%	Rank history: #4 in FY2021, #16 in FY2022, #16 in FY2023 and #6 in FY2025; up 11 since FY2023.
6	North American Association of Central Cancer Registries Inc. Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$2,911,466	2.1%	Rank history: #6 in FY2021, #7 in FY2022, #6 in FY2023 and #7 in FY2025; unchanged since FY2023.
7	Provider Resources Inc Top agencies VA (Department of Veterans Affairs)	$2,740,663	2.0%	Rank history: #19 in FY2021, #20 in FY2022, #11 in FY2023 and not on the FY2025 list; up 4 since FY2023.
8	National Association for Public Health Statistics and Information Systems, Inc. Top agencies DOS (Department of State) DCSA (Defense Counterintelligence and Security Agency) HHS (Department of Health and Human Services)	$2,654,249	1.9%	Rank history: #9 in FY2021, #15 in FY2022, #15 in FY2023 and #17 in FY2025; up 7 since FY2023.
9	Maximus Federal Services, Inc. Top agencies VA (Department of Veterans Affairs)	$2,173,816	1.6%	Rank history: #42 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
10	Island Peer Review Organization Inc. Top agencies VA (Department of Veterans Affairs)	$2,073,503	1.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
11	Institute of Transportation Engineers, Inc. Top agencies DOT (Department of Transportation)	$2,031,661	1.5%	Rank history: #41 in FY2021, #4 in FY2022, #8 in FY2023 and #18 in FY2025; down 3 since FY2023.
12	Sae International Top agencies DOT (Department of Transportation)	$2,021,007	1.5%	Rank history: #7 in FY2021, #13 in FY2022, #13 in FY2023 and #5 in FY2025; up 1 since FY2023.
13	Cornell University Top agencies Commerce (Department of Commerce)	$1,520,334	1.1%	Rank history: #22 in FY2021, #22 in FY2022, not on the FY2023 list and #9 in FY2025; returned.
14	American Association for the Advancement of Science Top agencies DOS (Department of State) Treasury (Department of the Treasury) HHS (Department of Health and Human Services)	$1,206,923	0.9%	Rank history: #8 in FY2021, #12 in FY2022, #9 in FY2023 and #22 in FY2025; down 5 since FY2023.
15	Capital Factory Properties LLC Top agencies Army (Department of the Army)	$1,200,190	0.9%	Rank history: #26 in FY2021, #28 in FY2022, #20 in FY2023 and #12 in FY2025; up 5 since FY2023.
16	Academy Health Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$1,150,000	0.8%	Rank history: #39 in FY2021, #17 in FY2022, #32 in FY2023 and #33 in FY2025; up 16 since FY2023.
17	XL Associates, Inc. Top agencies USAID (US Agency for International Development)	$1,026,537	0.7%	Rank history: #3 in FY2021, #6 in FY2022, #51 in FY2023 and not on the FY2025 list; up 34 since FY2023.
18	Texas A&M Transportation Institute Top agencies Commerce (Department of Commerce)	$995,617	0.7%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2025; new.
19	Purdue University Top agencies Commerce (Department of Commerce)	$994,347	0.7%	Rank history: #34 in FY2021, #31 in FY2022, #22 in FY2023 and #19 in FY2025; up 3 since FY2023.
20	Board of Regents of the University of Nebraska Top agencies Commerce (Department of Commerce)	$980,873	0.7%	Rank history: not on the FY2021–FY2023 lists and #14 in FY2025; new.
21	Juice Consulting LLC Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army)	$955,499	0.7%	Rank history: #63 in FY2021, #29 in FY2022, #61 in FY2023 and #50 in FY2025; up 40 since FY2023.
22	The American Society of Human Genetics, Incorporated Top agencies HHS (Department of Health and Human Services)	$944,270	0.7%	Rank history: not on the FY2021 list, #89 in FY2022, #75 in FY2023 and #13 in FY2025; up 53 since FY2023.
23	American Association of State Highway and Transportation Officials Top agencies DOT (Department of Transportation)	$944,078	0.7%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2025; up 81 since FY2023.
24	University of North Carolina At Chapel Hill Top agencies Commerce (Department of Commerce)	$934,161	0.7%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2025; new.
25	American Hospital Association Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$908,389	0.7%	Rank history: #28 in FY2021, #36 in FY2022, #26 in FY2023 and #16 in FY2025; up 1 since FY2023.
26	Rtca Inc. Top agencies DOT (Department of Transportation) NASA (National Aeronautics and Space Administration) DHS (Department of Homeland Security)	$801,544	0.6%	Rank history: #25 in FY2021, #19 in FY2022, #39 in FY2023 and #24 in FY2025; up 13 since FY2023.
27	National Academy of Sciences Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration) DOI (Department of the Interior)	$799,208	0.6%	Rank history: #29 in FY2021, #34 in FY2022, #28 in FY2023 and not on the FY2025 list; up 1 since FY2023.
28	Gartner, Inc. Top agencies DOT (Department of Transportation) NASA (National Aeronautics and Space Administration)	$795,298	0.6%	Rank history: #75 in FY2021, #51 in FY2022, #35 in FY2023 and #67 in FY2025; up 7 since FY2023.
29	Deloitte Through Deloitte Consulting LLP Top agencies DOE (Department of Energy)	$770,863	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
30	John Wiley & Sons Inc. Top agencies Navy (Department of the Navy)	$769,335	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
31	Allen Construction Company Inc Top agencies DOI (Department of the Interior)	$700,841	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
32	National Spectrum Consortium Inc. Top agencies Commerce (Department of Commerce)	$677,539	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
33	Open Geospatial Consortium Inc. Top agencies Commerce (Department of Commerce) DHS (Department of Homeland Security) DOI (Department of the Interior)	$589,000	0.4%	Rank history: #20 in FY2021, #24 in FY2022, #40 in FY2023 and #86 in FY2025; up 7 since FY2023.
34	American College of Medical Toxicology, Inc. Top agencies HHS (Department of Health and Human Services)	$566,500	0.4%	Rank history: not on the FY2021–FY2023 lists and #26 in FY2025; new.
35	Challenge America Top agencies VA (Department of Veterans Affairs)	$557,000	0.4%	Rank history: not on the FY2021 list, #59 in FY2022, not on the FY2023 list and #28 in FY2025; returned.
36	Association of Public Health Laboratories, Inc. (The) Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$545,962	0.4%	Rank history: #15 in FY2021, #10 in FY2022, #47 in FY2023 and not on the FY2025 list; up 11 since FY2023.
37	National Conference of State Legislatures Top agencies DOE (Department of Energy)	$521,977	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
38	American Association of Blood Banks, Inc. Top agencies DHA (Defense Health Agency)	$517,016	0.4%	Rank history: #37 in FY2021, #42 in FY2022, #41 in FY2023 and #30 in FY2025; up 3 since FY2023.
39	American National Standards Institute Incorporated Top agencies Commerce (Department of Commerce) DHS (Department of Homeland Security) USDA (Department of Agriculture)	$495,296	0.4%	Rank history: #91 in FY2021, #74 in FY2022, #44 in FY2023 and #77 in FY2025; up 5 since FY2023.
40	American Psychological Association Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$464,357	0.3%	Rank history: #27 in FY2021, not on the FY2022 list, #33 in FY2023 and #25 in FY2025; down 7 since FY2023.
41	National Conference of Bar Examiners	$459,678	0.3%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2023 and #34 in FY2025; up 9 since FY2023.
42	Accreditation Council for Graduate Medical Education Top agencies USUHS (DOD Uniformed Services University of the Health Sciences) DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$436,035	0.3%	Rank history: #51 in FY2021, #56 in FY2022, #42 in FY2023 and #36 in FY2025; unchanged since FY2023.
43	Military Operations Research Society, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$420,000	0.3%	Rank history: #43 in FY2021, #49 in FY2022, #49 in FY2023 and #29 in FY2025; up 6 since FY2023.
44	Accreditation Association for Ambulatory Health Care, Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$414,036	0.3%	Rank history: #32 in FY2021, #26 in FY2022, not on the FY2023 list and #35 in FY2025; up 88 since FY2023.
45	Air Force Sergeants Association Top agencies USAF (Department of the Air Force)	$411,173	0.3%	Rank history: #67 in FY2021, #53 in FY2022, #52 in FY2023 and not on the FY2025 list; up 7 since FY2023.
46	National Association of County and City Health Officials Top agencies DHS (Department of Homeland Security)	$386,919	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 281 since FY2023.
47	Institute of Electrical & Electronics Engineers Inc. Top agencies MDA (DOD Missile Defense Agency) DHS (Department of Homeland Security) DISA (Defense Information Systems Agency)	$363,240	0.3%	Rank history: not on the FY2021–FY2023 lists and #27 in FY2025; new.
48	American College of Surgeons Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$331,422	0.2%	Rank history: #13 in FY2021, #8 in FY2022, #19 in FY2023 and #10 in FY2025; down 29 since FY2023.
49	National Association of School Nurses, Incorporated Top agencies HHS (Department of Health and Human Services)	$323,970	0.2%	Rank history: #44 in FY2021, #50 in FY2022, #48 in FY2023 and not on the FY2025 list; down 1 since FY2023.
50	America Movil Peru Sac Top agencies DOS (Department of State)	$320,789	0.2%	Rank history: not on the FY2021–FY2023 lists and #49 in FY2025; new.
51	National Contract Management Association Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) HHS (Department of Health and Human Services)	$308,986	0.2%	Rank history: #73 in FY2021, #58 in FY2022, #77 in FY2023 and not on the FY2025 list; up 26 since FY2023.
52	The Institute of Electrical and Electronics Engineers Incorp Through Institute of Electrical & Electronics Engineers Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$298,120	0.2%	Rank history: #31 in FY2021, #35 in FY2022, #38 in FY2023 and not on the FY2025 list; down 14 since FY2023.
53	American Medical Informatics Association, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$292,700	0.2%	Rank history: not on the FY2021–FY2022 lists, #60 in FY2023 and #38 in FY2025; up 7 since FY2023.
54	Acog Foundation Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$268,660	0.2%	Rank history: #80 in FY2021, #63 in FY2022, #64 in FY2023 and not on the FY2025 list; up 10 since FY2023.
55	Naval Academy Athletic Association Top agencies Navy (Department of the Navy)	$262,080	0.2%	Rank history: #5 in FY2021, #5 in FY2022, #5 in FY2023 and #4 in FY2025; down 50 since FY2023.
56	The National Registry of Emergency Medical Technicians Inc. Top agencies USAF (Department of the Air Force)	$250,000	0.2%	Rank history: #74 in FY2021, not on the FY2022 list, #55 in FY2023 and #57 in FY2025; down 1 since FY2023.
57	Society for the Advancement of Chicanos and Native Americans In Science Top agencies Commerce (Department of Commerce) USDA (Department of Agriculture) NSF (National Science Foundation)	$249,500	0.2%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2023 and not on the FY2025 list; up 6 since FY2023.
58	Omniair Consortium Inc Top agencies DOT (Department of Transportation)	$248,461	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
59	Vlogic Systems, Inc. Top agencies VA (Department of Veterans Affairs)	$244,498	0.2%	Rank history: #55 in FY2021, #62 in FY2022, #65 in FY2023 and #39 in FY2025; up 6 since FY2023.
60	American College of Emergency Physicians Top agencies HHS (Department of Health and Human Services)	$239,000	0.2%	Rank history: #57 in FY2021, #71 in FY2022, #72 in FY2023 and #46 in FY2025; up 12 since FY2023.
61	National Alliance of State Pharmacy Associations Top agencies HHS (Department of Health and Human Services)	$229,035	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
62	Ceati International Inc. Top agencies DOI (Department of the Interior) DOE (Department of Energy) DHS (Department of Homeland Security)	$220,555	0.2%	Rank history: #58 in FY2021, #66 in FY2022, #66 in FY2023 and #40 in FY2025; up 4 since FY2023.
63	International Association of Firefighters Top agencies DHS (Department of Homeland Security)	$218,239	0.2%	Rank history: #70 in FY2021, #73 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
64	PQA Inc. Top agencies HHS (Department of Health and Human Services)	$214,200	0.2%	Rank history: #64 in FY2021, #68 in FY2022, #70 in FY2023 and not on the FY2025 list; up 6 since FY2023.
65	University Corporation for Advanced Internet Development Top agencies Commerce (Department of Commerce) DOI (Department of the Interior) NSF (National Science Foundation)	$203,898	0.1%	Rank history: #66 in FY2021, #98 in FY2022, #83 in FY2023 and #54 in FY2025; up 18 since FY2023.
66	University of California, Davis Top agencies EPA (Environmental Protection Agency)	$200,000	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
67	The Association of State and Territorial Health Officials Top agencies HHS (Department of Health and Human Services)	$200,000	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
68	Cabell Publishing Co Top agencies USDA (Department of Agriculture)	$196,630	0.1%	Rank history: #40 in FY2021, not on the FY2022–FY2023 lists and #45 in FY2025; returned.
69	American Association for Laboratory Accreditation, Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$195,859	0.1%	Rank history: #95 in FY2021, #91 in FY2022, #92 in FY2023 and #42 in FY2025; up 23 since FY2023.
70	Mgma-Acmpe Top agencies VA (Department of Veterans Affairs)	$195,700	0.1%	Rank history: #89 in FY2021, #80 in FY2022, #78 in FY2023 and #43 in FY2025; up 8 since FY2023.
71	Global Leadership Exchange, Inc. Top agencies HHS (Department of Health and Human Services)	$190,000	0.1%	Rank history: #97 in FY2021, #92 in FY2022, not on the FY2023 list and #48 in FY2025; up 32 since FY2023.
72	American Medical Association Top agencies VA (Department of Veterans Affairs) SSA (Social Security Administration)	$188,226	0.1%	Rank history: not on the FY2021 list, #93 in FY2022, not on the FY2023 list and #52 in FY2025; up 273 since FY2023.
73	American Society of Health-System Pharmacists Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$186,075	0.1%	Rank history: #79 in FY2021, #82 in FY2022, #74 in FY2023 and #51 in FY2025; up 1 since FY2023.
74	International Electrical Testing Association Top agencies Army (Department of the Army)	$184,166	0.1%	Rank history: not on the FY2021 list, #95 in FY2022, #87 in FY2023 and #62 in FY2025; up 13 since FY2023.
75	Global Carbon Capture and Storage Institute Ltd Top agencies DOE (Department of Energy)	$180,000	0.1%	Rank history: not on the FY2021 list, #75 in FY2022, #79 in FY2023 and #56 in FY2025; up 4 since FY2023.
76	American Indian Science and Engineering Society Top agencies NSF (National Science Foundation) NASA (National Aeronautics and Space Administration) EPA (Environmental Protection Agency)	$180,000	0.1%	Rank history: not on the FY2021 list, #99 in FY2022, #97 in FY2023 and not on the FY2025 list; up 21 since FY2023.
77	Daniel Lennart Jorgen Eriksson Top agencies DOS (Department of State)	$172,664	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
78	Partnership for Public Service Inc Top agencies DHRA (Defense Human Resources Activity) Treasury (Department of the Treasury) NASA (National Aeronautics and Space Administration)	$171,597	0.1%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023 and not on the FY2025 list; up 16 since FY2023.
79	Bi4You Top agencies DOJ (Department of Justice)	$170,000	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
80	American Academy of Family Physicians Top agencies Navy (Department of the Navy)	$156,434	0.1%	Rank history: #85 in FY2021, not on the FY2022 list, #82 in FY2023 and not on the FY2025 list; up 2 since FY2023.
81	RMG and Associates Top agencies Treasury (Department of the Treasury)	$155,999	0.1%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2023 and #60 in FY2025; down 24 since FY2023.
82	OASIS Open Top agencies DOJ (Department of Justice) DOT (Department of Transportation) Commerce (Department of Commerce)	$155,938	0.1%	Rank history: not on the FY2021–FY2023 lists and #41 in FY2025; new.
83	National Council for Prescription Drug Programs Inc. Top agencies HHS (Department of Health and Human Services) DOL (Department of Labor)	$153,039	0.1%	Rank history: #60 in FY2021, #69 in FY2022, #86 in FY2023 and #59 in FY2025; up 3 since FY2023.
84	Object Management Group Inc. Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration) Commerce (Department of Commerce)	$151,050	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 30 since FY2023.
85	Organisation for Economic Cooperation and Development Top agencies NASA (National Aeronautics and Space Administration)	$150,000	0.1%	Rank history: #96 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
86	Council of Chief State School Officers, Incorporated Top agencies DOI (Department of the Interior)	$145,000	0.1%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2025; new.
87	National Commission On Correctional Health Care Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security)	$144,666	0.1%	Rank history: not on the FY2021–FY2023 lists and #92 in FY2025; up 58 since FY2023.
88	Association of Small Business Development Centers Top agencies SBA (Small Business Administration)	$144,600	0.1%	Rank history: not on the FY2021 list, #88 in FY2022, #90 in FY2023 and not on the FY2025 list; up 2 since FY2023.
89	Information Technology Industry Council Inc. Top agencies Commerce (Department of Commerce) DISA (Defense Information Systems Agency)	$144,258	0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2025; up 12 since FY2023.
90	Alliance for Telecommunications Industry Solutions Inc. Top agencies Commerce (Department of Commerce) OSD (Office of the Secretary of Defense) DOT (Department of Transportation)	$143,475	0.1%	Rank history: #82 in FY2021, #97 in FY2022, #96 in FY2023 and #53 in FY2025; up 6 since FY2023.
91	National Strength & Conditioning Association Top agencies USAF (Department of the Air Force)	$131,640	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
92	Gregory Stephens Top agencies Treasury (Department of the Treasury)	$130,670	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 54 since FY2023.
93	Healthcare Information and Management Systems Society Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services) SSA (Social Security Administration)	$127,550	0.1%	Rank history: #48 in FY2021, #67 in FY2022, #68 in FY2023 and #61 in FY2025; down 25 since FY2023.
94	Association of Research Libraries Top agencies Smithsonian (Smithsonian Institution) USDA (Department of Agriculture) HHS (Department of Health and Human Services)	$125,012	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 30 since FY2023.
95	American Society for Radiation Oncology Top agencies VA (Department of Veterans Affairs)	$123,500	0.1%	Rank history: #100 in FY2021, not on the FY2022 list, #89 in FY2023 and #55 in FY2025; down 6 since FY2023.
96	Alaska Native Procurement Solutions LLC Top agencies DOI (Department of the Interior)	$122,889	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
97	American Nurses Credentialing Center, Inc. A / K / A American Nurses Credentialing Center Top agencies VA (Department of Veterans Affairs)	$117,928	0.1%	Rank history: not on the FY2021–FY2023 lists and #95 in FY2025; new.
98	Standards Coordinating Body for Gene Cell & Regenerative Medicines Top agencies Commerce (Department of Commerce)	$115,472	0.1%	Rank history: #45 in FY2021, #54 in FY2022, #62 in FY2023 and not on the FY2025 list; down 36 since FY2023.
99	University of Maryland, College Park Top agencies Commerce (Department of Commerce)	$115,000	0.1%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2025; new.
100	National Cancer Registrars Association Top agencies HHS (Department of Health and Human Services)	$108,750	0.1%	Rank history: not on the FY2021 list, #87 in FY2022, #91 in FY2023 and #68 in FY2025; down 9 since FY2023.

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100 of 420 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 8139

Code	Net obligations	Largest contractor
81392 Professional Organizations	$124,392,573	General Dynamics Corporation
81391 Business Associations	$5,320,933	American Hospital Association
81399 Other Similar Organizations (except Business, Professional, Labor, and Political Organizations)	$1,353,451	Challenge America

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 $139 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 NAICS 8139 contractors in FY2024?

1. General Dynamics Corporation ($27.9M), 2. Joint Commission On Accreditation of Healthcare Organizations ($20.1M), 3. Quality Insights, Inc. ($11.2M), 4. Nevada System of Higher Education ($5.24M), 5. Commission On Accreditation of Rehabilitation Facilities ($2.95M), 6. North American Association of Central Cancer Registries Inc. ($2.91M), 7. Provider Resources Inc ($2.74M), 8. National Association for Public Health Statistics and Information Systems, Inc. ($2.65M), 9. Maximus Federal Services, Inc. ($2.17M), 10. Island Peer Review Organization Inc. ($2.07M).

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