Top 100 Department of Health and Human Services Contractors, FY2025

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	General Dynamics Corporation 6 awardees, including General Dynamics Information Technology, Inc. Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services 541330 Engineering Services	$1,055,075,556	3.8%	Rank history: #9 in FY2021, #10 in FY2022, #4 in FY2023 and #4 in FY2024; up 3 since FY2024.
2	Maximus Federal Services, Inc. Top NAICS codes 561422 Telemarketing Bureaus and Other Contact Centers 541611 Administrative Management and General Management Consulting Services 541512 Computer Systems Design Services	$951,209,512	3.4%	Rank history: not on the FY2021–FY2023 lists and #5 in FY2024; up 3 since FY2024.
3	Leidos Holdings, Inc. 11 awardees, including Leidos Biomedical Research Inc., Leidos, Inc. and QTC Medical Services Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541512 Computer Systems Design Services 541519 Other Computer Related Services	$783,861,824	2.8%	Rank history: #3 in FY2021, #3 in FY2022, #2 in FY2023 and #3 in FY2024; unchanged since FY2024.
4	Booz Allen Hamilton Holding Corporation 2 awardees, including Booz Allen Hamilton Inc. Top NAICS codes 541512 Computer Systems Design Services 541990 All Other Professional, Scientific, and Technical Services 541611 Administrative Management and General Management Consulting Services	$638,088,558	2.3%	Rank history: #11 in FY2021, #8 in FY2022, #5 in FY2023 and #6 in FY2024; up 2 since FY2024.
5	Deloitte 3 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services 541519 Other Computer Related Services	$506,536,352	1.8%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; up 2 since FY2024.
6	Palmetto Gba, LLC Top NAICS codes 524114 Direct Health and Medical Insurance Carriers 541990 All Other Professional, Scientific, and Technical Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$362,647,589	1.3%	Rank history: not on the FY2021–FY2024 lists; up 212 since FY2024.
7	McKesson Corporation 7 awardees, including Mckesson Specialty Distribution LLC, Ndchealth Corporation and Mckesson Medical-Surgical Government Solutions LLC Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing 541519 Other Computer Related Services 424210 Drugs and Druggists' Sundries Merchant Wholesalers	$298,558,350	1.1%	Rank history: not on the FY2021–FY2024 lists; new.
8	Accenture Federal Services LLC 2 awardees, including Cognosante MVH LLC Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services 541611 Administrative Management and General Management Consulting Services	$286,256,802	1.0%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2024; up 14 since FY2024.
9	Emergent Biosolutions Inc. 3 awardees, including Emergent Product Development Gaithersburg Inc., Emergent Biosolutions Canada Inc. and Emergent Biodefense Operations Lansing LLC Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing 541711 Research and Development in Biotechnology 325414 Biological Product (except Diagnostic) Manufacturing	$283,825,322	1.0%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2024; up 11 since FY2024.
10	Carahsoft Technology Corp Top NAICS codes 511210 Software Publishers 334111 Electronic Computer Manufacturing 541519 Other Computer Related Services	$280,240,931	1.0%	Rank history: #38 in FY2021, #35 in FY2022, #16 in FY2023 and #13 in FY2024; up 3 since FY2024.
11	Peraton Inc. 3 awardees, including Peraton Enterprise Solutions LLC and Safeguard Services LLC Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services 541990 All Other Professional, Scientific, and Technical Services	$274,070,838	1.0%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2024; up 22 since FY2024.
12	Elevance Health, Inc. Through Wellpoint Federal Solutions, Inc. Top NAICS codes 524114 Direct Health and Medical Insurance Carriers 541512 Computer Systems Design Services 541519 Other Computer Related Services	$261,054,356	0.9%	Rank history: #29 in FY2021, #27 in FY2022, #19 in FY2023 and #32 in FY2024; up 20 since FY2024.
13	ICF International Inc. 4 awardees, including ICF Incorporated, L.L.C. and Semanticbits LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541519 Other Computer Related Services 541512 Computer Systems Design Services	$250,917,938	0.9%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2024; up 2 since FY2024.
14	Acacia Center for Justice Top NAICS codes 541110 Offices of Lawyers	$238,487,276	0.9%	Rank history: not on the FY2021–FY2023 lists and #14 in FY2024; unchanged since FY2024.
15	Guidehouse Inc. 5 awardees, including Guidehouse Digital LLC and Peraton Technology Services Inc. Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$238,189,513	0.9%	Rank history: not on the FY2021–FY2023 lists and #21 in FY2024; up 6 since FY2024.
16	Noridian Healthcare Solutions, LLC Top NAICS codes 524114 Direct Health and Medical Insurance Carriers 541990 All Other Professional, Scientific, and Technical Services	$236,144,110	0.9%	Rank history: not on the FY2021–FY2023 lists and #19 in FY2024; up 3 since FY2024.
17	Alvogen Group Inc. Through Alvogen, Inc. Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing	$227,679,088	0.8%	Rank history: not on the FY2021–FY2023 lists and #96 in FY2024; up 79 since FY2024.
18	Novitas Solutions, Inc. Top NAICS codes 524114 Direct Health and Medical Insurance Carriers 541990 All Other Professional, Scientific, and Technical Services 524292 Pharmacy Benefit Management and Other Third Party Administration of Insurance and Pension Funds	$227,406,723	0.8%	Rank history: not on the FY2021 list, #44 in FY2022, not on the FY2023 list and #30 in FY2024; up 12 since FY2024.
19	Companion Data Services LLC Top NAICS codes 541512 Computer Systems Design Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$214,491,718	0.8%	Rank history: not on the FY2021–FY2024 lists; new.
20	Serco Inc Top NAICS codes 541512 Computer Systems Design Services	$200,000,000	0.7%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2024; up 5 since FY2024.
21	Research Triangle Institute Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541990 All Other Professional, Scientific, and Technical Services 541690 Other Scientific and Technical Consulting Services	$187,497,123	0.7%	Rank history: #28 in FY2021, #25 in FY2022, #17 in FY2023 and #9 in FY2024; down 12 since FY2024.
22	Sagewind Capital LLC 2 awardees, including Softrams LLC and Tria Federal, LLC Top NAICS codes 541511 Custom Computer Programming Services 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services	$177,166,618	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
23	Jaynes Corporation Top NAICS codes 236220 Commercial and Institutional Building Construction	$172,026,432	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
24	Westat, Inc. 2 awardees, including Insight Policy Research, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541611 Administrative Management and General Management Consulting Services 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$161,168,549	0.6%	Rank history: #27 in FY2021, #22 in FY2022, #29 in FY2023 and #24 in FY2024; unchanged since FY2024.
25	Dell Technologies Inc. 2 awardees, including Dell Federal Systems L.P Top NAICS codes 511210 Software Publishers 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 339113 Surgical Appliance and Supplies Manufacturing	$150,681,998	0.5%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2024; up 10 since FY2024.
26	Axle Informatics, LLC Top NAICS codes 541519 Other Computer Related Services 541690 Other Scientific and Technical Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$150,019,628	0.5%	Rank history: #85 in FY2021, #59 in FY2022, #42 in FY2023 and #45 in FY2024; up 19 since FY2024.
27	Hensel Phelps Construction Co Top NAICS codes 236220 Commercial and Institutional Building Construction	$146,988,284	0.5%	Rank history: not on the FY2021 list, #6 in FY2022, not on the FY2023 list and #28 in FY2024; up 1 since FY2024.
28	Bavarian Nordic A / S Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing	$143,565,504	0.5%	Rank history: #65 in FY2021, #18 in FY2022, #56 in FY2023 and #26 in FY2024; down 2 since FY2024.
29	CGS Administrators, LLC Top NAICS codes 524114 Direct Health and Medical Insurance Carriers	$140,788,480	0.5%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2024; up 25 since FY2024.
30	The Chenega Corporation 14 awardees, including Chenega Enterprise Systems & Solutions, LLC, Chenega Government Mission Solutions, LLC and Chenega Global Protection, LLC Top NAICS codes 561612 Security Guards and Patrol Services 541611 Administrative Management and General Management Consulting Services 561320 Temporary Help Services	$128,954,770	0.5%	Rank history: not on the FY2021–FY2024 lists; up 259 since FY2024.
31	DLH Holdings Corp 3 awardees, including Dlh, LLC, Social & Scientific Systems, Inc. and Danya International LLC Top NAICS codes 541513 Computer Facilities Management Services 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services	$127,933,018	0.5%	Rank history: #86 in FY2021, #89 in FY2022, #57 in FY2023 and #46 in FY2024; up 15 since FY2024.
32	The Mitre Corporation Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541990 All Other Professional, Scientific, and Technical Services	$126,015,301	0.5%	Rank history: #25 in FY2021, #29 in FY2022, #20 in FY2023 and #23 in FY2024; down 9 since FY2024.
33	Index Analytics LLC Top NAICS codes 541511 Custom Computer Programming Services 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services	$115,003,125	0.4%	Rank history: not on the FY2021–FY2023 lists and #60 in FY2024; up 27 since FY2024.
34	Chartwell RX LLC Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing	$114,762,642	0.4%	Rank history: not on the FY2021 list, #45 in FY2022 and not on the FY2023–FY2024 lists; returned.
35	TMF Health Quality Institute 2 awardees, including C2C Innovative Solutions, Inc. Top NAICS codes 541618 Other Management Consulting Services 541611 Administrative Management and General Management Consulting Services	$114,196,598	0.4%	Rank history: not on the FY2021 list, #73 in FY2022 and not on the FY2023–FY2024 lists; returned.
36	National Opinion Research Center Top NAICS codes 541910 Marketing Research and Public Opinion Polling 541720 Research and Development in the Social Sciences and Humanities 541611 Administrative Management and General Management Consulting Services	$113,878,689	0.4%	Rank history: #41 in FY2021, #41 in FY2022, #37 in FY2023 and #40 in FY2024; up 4 since FY2024.
37	Kelly Services, Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541990 All Other Professional, Scientific, and Technical Services 541380 Testing Laboratories and Services	$113,562,865	0.4%	Rank history: not on the FY2021–FY2023 lists and #50 in FY2024; up 13 since FY2024.
38	I3 Federal LLC Top NAICS codes 541519 Other Computer Related Services	$113,355,752	0.4%	Rank history: not on the FY2021–FY2023 lists and #61 in FY2024; up 23 since FY2024.
39	Wisconsin Physicians Service Insurance Corp. Top NAICS codes 524114 Direct Health and Medical Insurance Carriers	$111,964,914	0.4%	Rank history: #66 in FY2021, #61 in FY2022, not on the FY2023 list and #52 in FY2024; up 13 since FY2024.
40	Government of the United States 4 awardees, including DLA Troop Support, Federal Prison Industries, Inc. and General Services Administration Greater Southwest Finance Center (7Bc) Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing 339113 Surgical Appliance and Supplies Manufacturing 337214 Office Furniture (except Wood) Manufacturing	$110,494,601	0.4%	Rank history: #91 in FY2021, #76 in FY2022, #64 in FY2023 and #64 in FY2024; up 24 since FY2024.
41	Mathematica Inc. Top NAICS codes 541720 Research and Development in the Social Sciences and Humanities 541690 Other Scientific and Technical Consulting Services 541611 Administrative Management and General Management Consulting Services	$108,644,509	0.4%	Rank history: #35 in FY2021, #36 in FY2022, #40 in FY2023 and #27 in FY2024; down 14 since FY2024.
42	Sparksoft Corporation 2 awardees Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services 541990 All Other Professional, Scientific, and Technical Services	$106,531,244	0.4%	Rank history: not on the FY2021–FY2023 lists and #68 in FY2024; up 26 since FY2024.
43	Black Canyon Consulting LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541511 Custom Computer Programming Services	$106,130,511	0.4%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023 and #70 in FY2024; up 27 since FY2024.
44	Start2 Group, Inc. Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$105,217,536	0.4%	Rank history: not on the FY2021–FY2024 lists; up 124 since FY2024.
45	Qlarant Integrity Solutions LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$98,267,574	0.4%	Rank history: not on the FY2021–FY2024 lists; up 121 since FY2024.
46	Koniag, Inc. 9 awardees, including Kadiak LLC, Koniag Professional Services, LLC and Koniag Data Solutions LLC Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services 541519 Other Computer Related Services	$95,357,638	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
47	The Emmes Company, LLC 2 awardees, including Essex Management LLC Top NAICS codes 541713 Research and Development in Nanotechnology 541690 Other Scientific and Technical Consulting Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$94,458,901	0.3%	Rank history: #73 in FY2021, #74 in FY2022, #68 in FY2023 and #56 in FY2024; up 9 since FY2024.
48	Battelle Memorial Institute 2 awardees Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology) 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541618 Other Management Consulting Services	$93,205,993	0.3%	Rank history: #84 in FY2021, not on the FY2022 list, #99 in FY2023 and #93 in FY2024; up 45 since FY2024.
49	Health Services Advisory Group, Inc. Top NAICS codes 541618 Other Management Consulting Services 541690 Other Scientific and Technical Consulting Services 541611 Administrative Management and General Management Consulting Services	$92,954,764	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
50	Superior Health Quality Alliance Inc. Top NAICS codes 541618 Other Management Consulting Services	$91,742,738	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
51	Amgen USA Inc Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$89,932,937	0.3%	Rank history: not on the FY2021–FY2023 lists and #42 in FY2024; down 9 since FY2024.
52	Fresenius Kabi, LLC Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing	$86,235,507	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
53	Seqirus Inc. Top NAICS codes 236210 Industrial Building Construction 325414 Biological Product (except Diagnostic) Manufacturing	$86,157,162	0.3%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2024; down 41 since FY2024.
54	Acumen LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541720 Research and Development in the Social Sciences and Humanities 541690 Other Scientific and Technical Consulting Services	$83,244,346	0.3%	Rank history: #53 in FY2021, #64 in FY2022, #63 in FY2023 and #53 in FY2024; down 1 since FY2024.
55	Rei Systems, Inc. 2 awardees, including Adg-Rei Technology Ventures, LLC Top NAICS codes 541511 Custom Computer Programming Services 541519 Other Computer Related Services 541512 Computer Systems Design Services	$81,235,622	0.3%	Rank history: #70 in FY2021, not on the FY2022–FY2023 lists and #79 in FY2024; up 24 since FY2024.
56	Sapient Government Services Inc. Top NAICS codes 541511 Custom Computer Programming Services 541611 Administrative Management and General Management Consulting Services	$80,439,429	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
57	Nava PBC Top NAICS codes 541511 Custom Computer Programming Services	$79,965,828	0.3%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2024; up 23 since FY2024.
58	Icahn School of Medicine At Mount Sinai Top NAICS codes 621498 All Other Outpatient Care Centers 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 923120 Administration of Public Health Programs	$79,625,668	0.3%	Rank history: not on the FY2021–FY2024 lists; up 184 since FY2024.
59	Esimplicity Inc. Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services	$78,351,189	0.3%	Rank history: not on the FY2021–FY2023 lists and #75 in FY2024; up 16 since FY2024.
60	Verizon 2 awardees, including Verizon Business Network Services LLC and Cellco Partnership Top NAICS codes 517110 Wired Telecommunications Carriers 517312 Wireless Telecommunications Carriers (except Satellite)	$78,313,709	0.3%	Rank history: not on the FY2021–FY2023 lists and #58 in FY2024; down 2 since FY2024.
61	CGI Federal Inc. Top NAICS codes 541519 Other Computer Related Services 541512 Computer Systems Design Services	$78,038,514	0.3%	Rank history: not on the FY2021–FY2024 lists; up 50 since FY2024.
62	Health Quality Innovators Top NAICS codes 541618 Other Management Consulting Services	$76,635,445	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
63	Chickasaw Nation 10 awardees, including Chickasaw Business Solutions, LLC, Chickasaw Strategic Pointe, LLC and Chickasaw Service Solutions, LLC Top NAICS codes 541519 Other Computer Related Services 541611 Administrative Management and General Management Consulting Services 541512 Computer Systems Design Services	$75,779,625	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
64	Exelan Pharmaceuticals Inc. Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing	$74,055,616	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
65	Telligen, Inc. Top NAICS codes 541618 Other Management Consulting Services	$72,943,053	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
66	Albert B. Sabin Vaccine Institute, Inc. (The) Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$70,386,301	0.3%	Rank history: not on the FY2021–FY2024 lists; up 208 since FY2024.
67	Charles River Laboratories International Inc. Through Charles River Laboratories, Inc. Top NAICS codes 561210 Facilities Support Services 541940 Veterinary Services 112990 All Other Animal Production	$69,865,089	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
68	Securitas Critical Infrastructure Services Inc. Through Paragon Systems Inc. Top NAICS codes 561612 Security Guards and Patrol Services	$69,540,129	0.3%	Rank history: not on the FY2021–FY2024 lists; up 157 since FY2024.
69	Medline Industries, LP Top NAICS codes 339112 Surgical and Medical Instrument Manufacturing 423450 Medical, Dental, and Hospital Equipment and Supplies Merchant Wholesalers 339113 Surgical Appliance and Supplies Manufacturing	$69,351,356	0.2%	Rank history: not on the FY2021–FY2024 lists; up 71 since FY2024.
70	Reli Group Inc. 2 awardees, including Data Quality Science, LLC Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services 541720 Research and Development in the Social Sciences and Humanities	$67,893,485	0.2%	Rank history: #96 in FY2021, #92 in FY2022 and not on the FY2023–FY2024 lists; up 104 since FY2024.
71	First Coast Service Options Inc. Top NAICS codes 524114 Direct Health and Medical Insurance Carriers	$66,085,523	0.2%	Rank history: not on the FY2021–FY2022 lists, #98 in FY2023 and #74 in FY2024; up 3 since FY2024.
72	Basilea Pharmaceutica AG Through Basilea Pharmaceutica International Ltd, Allschwil Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$63,700,481	0.2%	Rank history: not on the FY2021–FY2024 lists; up 129 since FY2024.
73	Technical Resources International, Inc. Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$63,059,092	0.2%	Rank history: #61 in FY2021, #85 in FY2022, #10 in FY2023 and #86 in FY2024; up 13 since FY2024.
74	New TECH Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services 334111 Electronic Computer Manufacturing 513210 Software Publishers	$62,388,024	0.2%	Rank history: not on the FY2021–FY2022 lists, #97 in FY2023 and #89 in FY2024; up 15 since FY2024.
75	Merck & Co. Inc. 2 awardees, including Cidara Therapeutics Inc. and Merck Sharp & Dohme LLC Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology) 325412 Pharmaceutical Preparation Manufacturing 493120 Refrigerated Warehousing and Storage	$61,927,626	0.2%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2024; down 39 since FY2024.
76	Four Points Technology, L.L.C. Top NAICS codes 541519 Other Computer Related Services 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers 513210 Software Publishers	$60,516,518	0.2%	Rank history: not on the FY2021–FY2024 lists; up 26 since FY2024.
77	Gap Solutions, Inc. Top NAICS codes 541690 Other Scientific and Technical Consulting Services 541990 All Other Professional, Scientific, and Technical Services 541611 Administrative Management and General Management Consulting Services	$60,210,426	0.2%	Rank history: not on the FY2021–FY2024 lists; up 39 since FY2024.
78	UnitedHealth Group Incorporated 7 awardees, including The Lewin Group, Inc., Optumserve Technology Services, Inc. and Optumserve Health Services, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 621498 All Other Outpatient Care Centers 541720 Research and Development in the Social Sciences and Humanities	$59,847,345	0.2%	Rank history: #30 in FY2021, #31 in FY2022, #58 in FY2023 and #43 in FY2024; down 35 since FY2024.
79	Science Applications International Corporation Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services	$59,139,475	0.2%	Rank history: not on the FY2021–FY2024 lists; up 231 since FY2024.
80	Sanofi Pasteur Inc. Through Sanofi Vaccines US Inc. Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology) 325414 Biological Product (except Diagnostic) Manufacturing 493120 Refrigerated Warehousing and Storage	$55,503,874	0.2%	Rank history: not on the FY2021–FY2024 lists; up 45 since FY2024.
81	Nighthawk Biosciences, Inc. Through Elusys Therapeutics Inc. Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing	$55,273,060	0.2%	Rank history: not on the FY2021–FY2023 lists and #83 in FY2024; up 2 since FY2024.
82	American Electric Power Company, Inc. 2 awardees, including AEP Energy Inc. Top NAICS codes 221112 Fossil Fuel Electric Power Generation 221122 Electric Power Distribution	$54,137,162	0.2%	Rank history: not on the FY2021–FY2024 lists; up 66 since FY2024.
83	Siga Technologies, Inc. Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$53,123,168	0.2%	Rank history: #51 in FY2021, not on the FY2022 list, #50 in FY2023 and #51 in FY2024; down 32 since FY2024.
84	Four Seasons Environmental Inc. Top NAICS codes 561210 Facilities Support Services	$51,913,119	0.2%	Rank history: not on the FY2021–FY2024 lists; up 39 since FY2024.
85	Clark Construction Group LLC Top NAICS codes 236220 Commercial and Institutional Building Construction	$51,477,000	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
86	Porter Novelli Public Services Inc. Top NAICS codes 541810 Advertising Agencies 541613 Marketing Consulting Services	$51,433,495	0.2%	Rank history: not on the FY2021–FY2023 lists and #76 in FY2024; down 10 since FY2024.
87	Performant Financial Corporation Through Performant Recovery, Inc. Top NAICS codes 561440 Collection Agencies 541611 Administrative Management and General Management Consulting Services	$51,257,062	0.2%	Rank history: not on the FY2021–FY2024 lists; up 102 since FY2024.
88	True North Communications Inc. Top NAICS codes 541810 Advertising Agencies	$51,153,846	0.2%	Rank history: not on the FY2021–FY2023 lists and #73 in FY2024; down 15 since FY2024.
89	Asgn Incorporated 2 awardees, including ECS Federal, LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 541330 Engineering Services	$50,003,035	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
90	The Whiting-Turner Contracting Company Top NAICS codes 236220 Commercial and Institutional Building Construction	$49,912,622	0.2%	Rank history: not on the FY2021–FY2022 lists, #85 in FY2023 and #87 in FY2024; down 3 since FY2024.
91	Dynanet Corporation Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services	$49,293,582	0.2%	Rank history: not on the FY2021–FY2024 lists; up 279 since FY2024.
92	A Square Group LLC Top NAICS codes 541512 Computer Systems Design Services	$48,826,462	0.2%	Rank history: not on the FY2021–FY2023 lists and #94 in FY2024; up 2 since FY2024.
93	NTT Data Services Federal Government, LLC Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services	$48,761,095	0.2%	Rank history: not on the FY2021–FY2024 lists; up 153 since FY2024.
94	Tunnell Consulting Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$47,959,730	0.2%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2024; down 12 since FY2024.
95	Mapp Biopharmaceutical, Inc. Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$47,939,332	0.2%	Rank history: not on the FY2021 list, #32 in FY2022 and not on the FY2023–FY2024 lists; returned.
96	Altitude Technologies Inc. Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing	$47,794,832	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
97	Data Computer Corporation of America Top NAICS codes 541519 Other Computer Related Services 541512 Computer Systems Design Services	$47,780,487	0.2%	Rank history: not on the FY2021–FY2024 lists; up 147 since FY2024.
98	Nana Regional Corporation, Inc. 7 awardees, including Affigent, LLC, Akima Secure Technologies, LLC and Akima Data Management LLC Top NAICS codes 541519 Other Computer Related Services 541513 Computer Facilities Management Services 541512 Computer Systems Design Services	$46,478,780	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
99	American Institutes for Research In the Behavioral Sciences Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541720 Research and Development in the Social Sciences and Humanities 541690 Other Scientific and Technical Consulting Services	$46,292,292	0.2%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2024; down 22 since FY2024.
100	Kaiva Strategies, LLC 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	$46,021,002	0.2%	Rank history: not on the FY2021–FY2024 lists; up 102 since FY2024.

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 $27.8 billion 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.
• 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