Top 100 Department of Health and Human Services Contractors, Aug 2025–Jul 2026

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Leidos Holdings, Inc. 10 awardees, including Leidos Biomedical Research Inc. and Leidos, 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	$1,045,386,814	4.0%	Rank history: #3 in FY2021, #3 in FY2022, #2 in FY2023, #3 in FY2024 and #3 in FY2025; up 2 since Aug 2024–Jul 2025.
2	Maximus Federal Services, Inc. Top NAICS codes 561422 Telemarketing Bureaus and Other Contact Centers 541611 Administrative Management and General Management Consulting Services	$810,849,283	3.1%	Rank history: not on the FY2021–FY2023 lists, #5 in FY2024 and #2 in FY2025; unchanged since Aug 2024–Jul 2025.
3	General Dynamics Corporation 4 awardees, including General Dynamics Information Technology, Inc. and Dynport Vaccine Company LLC Top NAICS codes 541512 Computer Systems Design Services 541511 Custom Computer Programming Services 541330 Engineering Services	$780,565,066	3.0%	Rank history: #9 in FY2021, #10 in FY2022, #4 in FY2023, #4 in FY2024 and #1 in FY2025; down 2 since Aug 2024–Jul 2025.
4	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	$553,130,416	2.1%	Rank history: not on the FY2021–FY2023 lists, #7 in FY2024 and #5 in FY2025; up 1 since Aug 2024–Jul 2025.
5	Booz Allen Hamilton Holding Corporation 3 awardees, including Booz Allen Hamilton 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	$545,789,021	2.1%	Rank history: #11 in FY2021, #8 in FY2022, #5 in FY2023, #6 in FY2024 and #4 in FY2025; down 1 since Aug 2024–Jul 2025.
6	Manhattan Torcon A Joint Venture Top NAICS codes 236220 Commercial and Institutional Building Construction	$491,767,200	1.9%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
7	Carahsoft Technology Corp Top NAICS codes 511210 Software Publishers 541519 Other Computer Related Services 334111 Electronic Computer Manufacturing	$379,207,296	1.4%	Rank history: #38 in FY2021, #35 in FY2022, #16 in FY2023, #13 in FY2024 and #10 in FY2025; up 10 since Aug 2024–Jul 2025.
8	Guidehouse Inc. 9 awardees, including Guidehouse Digital LLC, Peraton Inc. and Peraton Enterprise Solutions LLC Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services 541511 Custom Computer Programming Services	$354,276,080	1.3%	Rank history: not on the FY2021–FY2023 lists, #21 in FY2024 and #15 in FY2025; up 112 since Aug 2024–Jul 2025.
9	Palmetto Gba, LLC Top NAICS codes 524114 Direct Health and Medical Insurance Carriers 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 541990 All Other Professional, Scientific, and Technical Services	$315,168,954	1.2%	Rank history: not on the FY2021–FY2024 lists and #6 in FY2025; up 13 since Aug 2024–Jul 2025.
10	Emergent Biosolutions Inc. 4 awardees, including Emergent Product Development Gaithersburg Inc., Emergent Biosolutions Canada Inc. and Emergent Biodefense Operations Lansing LLC Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing 325414 Biological Product (except Diagnostic) Manufacturing 541711 Research and Development in Biotechnology	$276,510,497	1.1%	Rank history: not on the FY2021–FY2023 lists, #20 in FY2024 and #9 in FY2025; up 10 since Aug 2024–Jul 2025.
11	Noridian Healthcare Solutions, LLC Top NAICS codes 524114 Direct Health and Medical Insurance Carriers 541990 All Other Professional, Scientific, and Technical Services	$275,861,460	1.1%	Rank history: not on the FY2021–FY2023 lists, #19 in FY2024 and #16 in FY2025; up 8 since Aug 2024–Jul 2025.
12	ICF International Inc. 5 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	$251,756,680	1.0%	Rank history: not on the FY2021–FY2023 lists, #15 in FY2024 and #13 in FY2025; down 1 since Aug 2024–Jul 2025.
13	Analytic Services Inc. Through Advanced Technology International Top NAICS codes 325414 Biological Product (except Diagnostic) Manufacturing 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$247,999,997	0.9%	Rank history: not on the FY2021–FY2022 lists, #1 in FY2023, #1 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
14	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	$231,867,231	0.9%	Rank history: #29 in FY2021, #27 in FY2022, #19 in FY2023, #32 in FY2024 and #12 in FY2025; down 5 since Aug 2024–Jul 2025.
15	Research Triangle Institute Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541990 All Other Professional, Scientific, and Technical Services 541720 Research and Development in the Social Sciences and Humanities	$230,798,940	0.9%	Rank history: #28 in FY2021, #25 in FY2022, #17 in FY2023, #9 in FY2024 and #21 in FY2025; down 2 since Aug 2024–Jul 2025.
16	Albert B. Sabin Vaccine Institute, Inc. (The) Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$223,798,176	0.9%	Rank history: not on the FY2021–FY2024 lists and #66 in FY2025; up 42 since Aug 2024–Jul 2025.
17	Serco Inc Top NAICS codes 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services	$222,219,432	0.8%	Rank history: not on the FY2021–FY2023 lists, #25 in FY2024 and #20 in FY2025; up 6 since Aug 2024–Jul 2025.
18	Companion Data Services LLC Top NAICS codes 541512 Computer Systems Design Services	$218,297,343	0.8%	Rank history: not on the FY2021–FY2024 lists and #19 in FY2025; up 15 since Aug 2024–Jul 2025.
19	Peraton Inc. 3 awardees, including Safeguard Services LLC and Peraton Enterprise Solutions LLC Top NAICS codes 541512 Computer Systems Design Services 541990 All Other Professional, Scientific, and Technical Services 541511 Custom Computer Programming Services	$215,363,883	0.8%	Rank history: not on the FY2021–FY2023 lists, #33 in FY2024 and #11 in FY2025; down 4 since Aug 2024–Jul 2025.
20	McKesson Corporation 11 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	$201,033,281	0.8%	Rank history: #1 in FY2021, #4 in FY2022, #26 in FY2023, #78 in FY2024 and #7 in FY2025; down 12 since Aug 2024–Jul 2025.
21	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) 541910 Marketing Research and Public Opinion Polling 541611 Administrative Management and General Management Consulting Services	$184,508,505	0.7%	Rank history: #27 in FY2021, #22 in FY2022, #29 in FY2023, #24 in FY2024 and #24 in FY2025; up 7 since Aug 2024–Jul 2025.
22	Acacia Center for Justice Top NAICS codes 541110 Offices of Lawyers	$180,807,136	0.7%	Rank history: not on the FY2021–FY2023 lists, #14 in FY2024 and #14 in FY2025; down 6 since Aug 2024–Jul 2025.
23	Jaynes Corporation Top NAICS codes 236220 Commercial and Institutional Building Construction	$173,260,342	0.7%	Rank history: not on the FY2021–FY2024 lists and #23 in FY2025; new, not ranked in Aug 2024–Jul 2025.
24	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	$164,207,210	0.6%	Rank history: not on the FY2021–FY2024 lists and #22 in FY2025; new, not ranked in Aug 2024–Jul 2025.
25	Index Analytics LLC Top NAICS codes 541511 Custom Computer Programming Services 541611 Administrative Management and General Management Consulting Services 541512 Computer Systems Design Services	$154,310,928	0.6%	Rank history: not on the FY2021–FY2023 lists, #60 in FY2024 and #33 in FY2025; up 23 since Aug 2024–Jul 2025.
26	Hensel Phelps Construction Co Top NAICS codes 236220 Commercial and Institutional Building Construction	$149,130,591	0.6%	Rank history: not on the FY2021 list, #6 in FY2022, not on the FY2023 list, #28 in FY2024 and #27 in FY2025; up 3 since Aug 2024–Jul 2025.
27	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 541519 Other Computer Related Services	$144,504,633	0.6%	Rank history: not on the FY2021–FY2023 lists, #35 in FY2024 and #25 in FY2025; unchanged since Aug 2024–Jul 2025.
28	The Mitre Corporation Top NAICS codes 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$144,305,915	0.5%	Rank history: #25 in FY2021, #29 in FY2022, #20 in FY2023, #23 in FY2024 and #32 in FY2025; down 3 since Aug 2024–Jul 2025.
29	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	$140,135,872	0.5%	Rank history: not on the FY2021 list, #44 in FY2022, not on the FY2023 list, #30 in FY2024 and #18 in FY2025; down 17 since Aug 2024–Jul 2025.
30	The Chenega Corporation 14 awardees, including Chenega Global Protection, LLC, Chenega Government Mission Solutions, LLC and Chenega Enterprise Systems & Solutions, LLC Top NAICS codes 561612 Security Guards and Patrol Services 541611 Administrative Management and General Management Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$138,119,690	0.5%	Rank history: not on the FY2021–FY2024 lists and #30 in FY2025; new, not ranked in Aug 2024–Jul 2025.
31	National Opinion Research Center Top NAICS codes 541720 Research and Development in the Social Sciences and Humanities 541910 Marketing Research and Public Opinion Polling 541611 Administrative Management and General Management Consulting Services	$135,572,753	0.5%	Rank history: #41 in FY2021, #41 in FY2022, #37 in FY2023, #40 in FY2024 and #36 in FY2025; up 14 since Aug 2024–Jul 2025.
32	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	$135,208,084	0.5%	Rank history: #85 in FY2021, #59 in FY2022, #42 in FY2023, #45 in FY2024 and #26 in FY2025; down 1 since Aug 2024–Jul 2025.
33	Mathematica Inc. Top NAICS codes 541720 Research and Development in the Social Sciences and Humanities 541611 Administrative Management and General Management Consulting Services 541990 All Other Professional, Scientific, and Technical Services	$122,959,868	0.5%	Rank history: #35 in FY2021, #36 in FY2022, #40 in FY2023, #27 in FY2024 and #41 in FY2025; up 4 since Aug 2024–Jul 2025.
34	Shionogi & Company Limited Through Shionogi Inc. Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$119,160,688	0.5%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
35	Start2 Group, Inc. Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$117,505,224	0.4%	Rank history: not on the FY2021–FY2024 lists and #44 in FY2025; up 121 since Aug 2024–Jul 2025.
36	CGS Administrators, LLC Top NAICS codes 524114 Direct Health and Medical Insurance Carriers	$115,832,669	0.4%	Rank history: not on the FY2021–FY2023 lists, #54 in FY2024 and #29 in FY2025; up 3 since Aug 2024–Jul 2025.
37	Koniag, Inc. 9 awardees, including Kadiak LLC, Koniag Professional Services, LLC and Koniag Data Solutions LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541512 Computer Systems Design Services 541519 Other Computer Related Services	$113,696,218	0.4%	Rank history: not on the FY2021–FY2024 lists and #46 in FY2025; up 109 since Aug 2024–Jul 2025.
38	Phlow Corp. Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing	$113,641,157	0.4%	Rank history: not on the FY2021 list, #77 in FY2022, not on the FY2023 list, #65 in FY2024 and not on the FY2025 list; up 25 since Aug 2024–Jul 2025.
39	I3 Federal LLC Top NAICS codes 541519 Other Computer Related Services	$113,355,752	0.4%	Rank history: not on the FY2021–FY2023 lists, #61 in FY2024 and #38 in FY2025; up 16 since Aug 2024–Jul 2025.
40	Accenture Federal Services LLC 2 awardees, including Cognosante MVH LLC Top NAICS codes 541511 Custom Computer Programming Services 541512 Computer Systems Design Services 541611 Administrative Management and General Management Consulting Services	$109,726,296	0.4%	Rank history: not on the FY2021–FY2023 lists, #22 in FY2024 and #8 in FY2025; down 22 since Aug 2024–Jul 2025.
41	Sapient Government Services Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541511 Custom Computer Programming Services	$107,465,676	0.4%	Rank history: not on the FY2021–FY2024 lists and #56 in FY2025; up 84 since Aug 2024–Jul 2025.
42	Wisconsin Physicians Service Insurance Corp. Top NAICS codes 524114 Direct Health and Medical Insurance Carriers	$102,590,905	0.4%	Rank history: #66 in FY2021, #61 in FY2022, not on the FY2023 list, #52 in FY2024 and #39 in FY2025; up 2 since Aug 2024–Jul 2025.
43	UnitedHealth Group Incorporated 8 awardees, including The Lewin Group, Inc., Optumserve Health Services, Inc. and Optumserve Technology Services, Inc. Top NAICS codes 541720 Research and Development in the Social Sciences and Humanities 541611 Administrative Management and General Management Consulting Services 621498 All Other Outpatient Care Centers	$95,619,386	0.4%	Rank history: #30 in FY2021, #31 in FY2022, #58 in FY2023, #43 in FY2024 and #78 in FY2025; up 36 since Aug 2024–Jul 2025.
44	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	$94,716,737	0.4%	Rank history: not on the FY2021–FY2024 lists and #58 in FY2025; up 31 since Aug 2024–Jul 2025.
45	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	$94,522,065	0.4%	Rank history: not on the FY2021–FY2023 lists, #50 in FY2024 and #37 in FY2025; down 2 since Aug 2024–Jul 2025.
46	Battelle Memorial Institute 3 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	$94,010,409	0.4%	Rank history: #84 in FY2021, not on the FY2022 list, #99 in FY2023, #93 in FY2024 and #48 in FY2025; up 23 since Aug 2024–Jul 2025.
47	Sparksoft Corporation 2 awardees Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services	$90,569,696	0.3%	Rank history: not on the FY2021–FY2023 lists, #68 in FY2024 and #42 in FY2025; down 9 since Aug 2024–Jul 2025.
48	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	$89,544,793	0.3%	Rank history: #70 in FY2021, not on the FY2022–FY2023 lists, #79 in FY2024 and #55 in FY2025; up 26 since Aug 2024–Jul 2025.
49	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 541611 Administrative Management and General Management Consulting Services	$88,356,149	0.3%	Rank history: #73 in FY2021, #74 in FY2022, #68 in FY2023, #56 in FY2024 and #47 in FY2025; unchanged since Aug 2024–Jul 2025.
50	Acumen LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541720 Research and Development in the Social Sciences and Humanities 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$87,647,841	0.3%	Rank history: #53 in FY2021, #64 in FY2022, #63 in FY2023, #53 in FY2024 and #54 in FY2025; up 7 since Aug 2024–Jul 2025.
51	DLH Holdings Corp 2 awardees, including Dlh, LLC and Social & Scientific Systems, Inc. Top NAICS codes 541512 Computer Systems Design Services 541513 Computer Facilities Management Services 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)	$85,609,634	0.3%	Rank history: #86 in FY2021, #89 in FY2022, #57 in FY2023, #46 in FY2024 and #31 in FY2025; down 1 since Aug 2024–Jul 2025.
52	True North Communications Inc. Top NAICS codes 541810 Advertising Agencies	$82,487,878	0.3%	Rank history: not on the FY2021–FY2023 lists, #73 in FY2024 and #88 in FY2025; down 17 since Aug 2024–Jul 2025.
53	Securitas Critical Infrastructure Services Inc. Through Paragon Systems Inc. Top NAICS codes 561612 Security Guards and Patrol Services	$79,336,360	0.3%	Rank history: not on the FY2021–FY2024 lists and #68 in FY2025; up 66 since Aug 2024–Jul 2025.
54	Qlarant Integrity Solutions LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services	$77,552,442	0.3%	Rank history: not on the FY2021–FY2024 lists and #45 in FY2025; down 8 since Aug 2024–Jul 2025.
55	Seqirus Inc. Top NAICS codes 236210 Industrial Building Construction 325414 Biological Product (except Diagnostic) Manufacturing	$76,723,363	0.3%	Rank history: not on the FY2021–FY2023 lists, #12 in FY2024 and #53 in FY2025; down 41 since Aug 2024–Jul 2025.
56	Every Cure Inc.	$76,045,600	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
57	Chickasaw Nation 9 awardees, including Chickasaw Service Solutions, LLC, Chickasaw Federal Health, LLC and Chickasaw Business Solutions, LLC Top NAICS codes 541519 Other Computer Related Services 541611 Administrative Management and General Management Consulting Services 541512 Computer Systems Design Services	$75,531,324	0.3%	Rank history: not on the FY2021–FY2024 lists and #63 in FY2025; new, not ranked in Aug 2024–Jul 2025.
58	Basilea Pharmaceutica AG Through Basilea Pharmaceutica International Ltd, Allschwil Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$74,027,460	0.3%	Rank history: not on the FY2021–FY2024 lists and #72 in FY2025; up 24 since Aug 2024–Jul 2025.
59	First Coast Service Options Inc. Top NAICS codes 524114 Direct Health and Medical Insurance Carriers	$72,077,368	0.3%	Rank history: not on the FY2021–FY2022 lists, #98 in FY2023, #74 in FY2024 and #71 in FY2025; up 19 since Aug 2024–Jul 2025.
60	Government of the United States 5 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 337211 Wood Office Furniture Manufacturing	$71,622,348	0.3%	Rank history: #91 in FY2021, #76 in FY2022, #64 in FY2023, #64 in FY2024 and #40 in FY2025; down 18 since Aug 2024–Jul 2025.
61	Performant Financial Corporation Through Performant Recovery, Inc. Top NAICS codes 561440 Collection Agencies 541611 Administrative Management and General Management Consulting Services	$69,742,480	0.3%	Rank history: not on the FY2021–FY2024 lists and #87 in FY2025; up 48 since Aug 2024–Jul 2025.
62	Charles River Laboratories International Inc. 3 awardees, including Charles River Laboratories, Inc. and Charles River Discovery Research Services UK Limited Top NAICS codes 561210 Facilities Support Services 541940 Veterinary Services 112990 All Other Animal Production	$69,415,372	0.3%	Rank history: not on the FY2021–FY2024 lists and #67 in FY2025; up 28 since Aug 2024–Jul 2025.
63	Four Points Technology, L.L.C. Top NAICS codes 541519 Other Computer Related Services 513210 Software Publishers 532490 Other Commercial and Industrial Machinery and Equipment Rental and Leasing	$67,325,159	0.3%	Rank history: not on the FY2021–FY2024 lists and #76 in FY2025; up 9 since Aug 2024–Jul 2025.
64	Kpmg LLP Top NAICS codes 541211 Offices of Certified Public Accountants	$66,772,323	0.3%	Rank history: not on the FY2021–FY2025 lists; up 96 since Aug 2024–Jul 2025.
65	Hendall Inc. Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 541611 Administrative Management and General Management Consulting Services 541690 Other Scientific and Technical Consulting Services	$66,005,146	0.3%	Rank history: not on the FY2021–FY2025 lists; up 316 since Aug 2024–Jul 2025.
66	American Institutes for Research In the Behavioral Sciences Top NAICS codes 541720 Research and Development in the Social Sciences and Humanities 541611 Administrative Management and General Management Consulting Services 541690 Other Scientific and Technical Consulting Services	$64,571,545	0.2%	Rank history: not on the FY2021–FY2023 lists, #77 in FY2024 and #99 in FY2025; up 22 since Aug 2024–Jul 2025.
67	Nana Regional Corporation, Inc. 8 awardees, including Affigent, LLC, Akima Data Management LLC and Akima Secure Technologies, LLC Top NAICS codes 541519 Other Computer Related Services 541513 Computer Facilities Management Services 561210 Facilities Support Services	$63,593,798	0.2%	Rank history: not on the FY2021–FY2024 lists and #98 in FY2025; up 172 since Aug 2024–Jul 2025.
68	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)	$63,398,009	0.2%	Rank history: #61 in FY2021, #85 in FY2022, #10 in FY2023, #86 in FY2024 and #73 in FY2025; up 3 since Aug 2024–Jul 2025.
69	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	$61,925,013	0.2%	Rank history: not on the FY2021–FY2023 lists, #36 in FY2024 and #75 in FY2025; down 39 since Aug 2024–Jul 2025.
70	Verizon 7 awardees, including Verizon Business Network Services LLC, Cellco Partnership and Navajo Communications Co., Inc. Top NAICS codes 517110 Wired Telecommunications Carriers 517312 Wireless Telecommunications Carriers (except Satellite) 517111 Wired Telecommunications Carriers	$60,318,327	0.2%	Rank history: not on the FY2021–FY2023 lists, #58 in FY2024 and #60 in FY2025; down 19 since Aug 2024–Jul 2025.
71	Amgen USA Inc Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$59,988,840	0.2%	Rank history: not on the FY2021–FY2023 lists, #42 in FY2024 and #51 in FY2025; down 50 since Aug 2024–Jul 2025.
72	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	$59,145,735	0.2%	Rank history: not on the FY2021–FY2024 lists and #77 in FY2025; up 24 since Aug 2024–Jul 2025.
73	Esimplicity Inc. Top NAICS codes 541512 Computer Systems Design Services	$58,600,251	0.2%	Rank history: not on the FY2021–FY2023 lists, #75 in FY2024 and #59 in FY2025; down 20 since Aug 2024–Jul 2025.
74	Agiliti Health Inc Top NAICS codes 811210 Electronic and Precision Equipment Repair and Maintenance 339113 Surgical Appliance and Supplies Manufacturing 811219 Other Electronic and Precision Equipment Repair and Maintenance	$56,995,081	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
75	Digital Management LLC Top NAICS codes 541519 Other Computer Related Services 541512 Computer Systems Design Services	$56,837,627	0.2%	Rank history: not on the FY2021–FY2025 lists; up 96 since Aug 2024–Jul 2025.
76	Four Seasons Environmental Inc. Top NAICS codes 561210 Facilities Support Services	$56,741,250	0.2%	Rank history: not on the FY2021–FY2024 lists and #84 in FY2025; up 41 since Aug 2024–Jul 2025.
77	Science Applications International Corporation Top NAICS codes 541512 Computer Systems Design Services	$56,029,172	0.2%	Rank history: not on the FY2021–FY2024 lists and #79 in FY2025; up 23 since Aug 2024–Jul 2025.
78	STG International, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services 621999 All Other Miscellaneous Ambulatory Health Care Services	$55,939,215	0.2%	Rank history: not on the FY2021–FY2025 lists; up 188 since Aug 2024–Jul 2025.
79	New TECH Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services 334111 Electronic Computer Manufacturing 334118 Computer Terminal and Other Computer Peripheral Equipment Manufacturing	$55,691,802	0.2%	Rank history: not on the FY2021–FY2022 lists, #97 in FY2023, #89 in FY2024 and #74 in FY2025; up 7 since Aug 2024–Jul 2025.
80	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, #83 in FY2024 and #81 in FY2025; new, not ranked in Aug 2024–Jul 2025.
81	Roche Holdings Inc. 5 awardees, including Genentech Usa, Inc., Hoffmann-La Roche Inc. and Roche Diagnostics Corporation Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing 541711 Research and Development in Biotechnology 334516 Analytical Laboratory Instrument Manufacturing	$55,007,614	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
82	Vets Synergetic Group LLC Top NAICS codes 541990 All Other Professional, Scientific, and Technical Services 541519 Other Computer Related Services 541512 Computer Systems Design Services	$54,413,331	0.2%	Rank history: not on the FY2021–FY2025 lists; up 132 since Aug 2024–Jul 2025.
83	Iron Vine Security LLC Top NAICS codes 541519 Other Computer Related Services	$53,367,039	0.2%	Rank history: not on the FY2021–FY2025 lists; up 49 since Aug 2024–Jul 2025.
84	Public Health Vaccines LLC Top NAICS codes 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$52,936,200	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
85	Island Peer Review Organization Inc. Top NAICS codes 541618 Other Management Consulting Services	$52,401,394	0.2%	Rank history: not on the FY2021–FY2025 lists; up 65 since Aug 2024–Jul 2025.
86	Thundercat Technology LLC Top NAICS codes 541519 Other Computer Related Services 519290 Web Search Portals and All Other Information Services	$52,373,833	0.2%	Rank history: not on the FY2021–FY2025 lists; up 55 since Aug 2024–Jul 2025.
87	Exelon Corporation 4 awardees, including Potomac Electric Power Co and Baltimore Gas and Electric Company Top NAICS codes 221118 Other Electric Power Generation 221122 Electric Power Distribution	$52,201,661	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
88	IPG Dxtra, Inc. Top NAICS codes 541810 Advertising Agencies 541613 Marketing Consulting Services	$51,863,371	0.2%	Rank history: not on the FY2021–FY2025 lists; up 79 since Aug 2024–Jul 2025.
89	Black Canyon Consulting LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services 541511 Custom Computer Programming Services	$51,822,686	0.2%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2023, #70 in FY2024 and #43 in FY2025; down 53 since Aug 2024–Jul 2025.
90	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 and #85 in FY2025; new, not ranked in Aug 2024–Jul 2025.
91	TMF Health Quality Institute 2 awardees, including C2C Innovative Solutions, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$51,225,185	0.2%	Rank history: not on the FY2021 list, #73 in FY2022, not on the FY2023–FY2024 lists and #35 in FY2025; down 24 since Aug 2024–Jul 2025.
92	Nava PBC Top NAICS codes 541511 Custom Computer Programming Services	$50,780,872	0.2%	Rank history: not on the FY2021–FY2023 lists, #80 in FY2024 and #57 in FY2025; down 33 since Aug 2024–Jul 2025.
93	Flexion Inc. Top NAICS codes 541511 Custom Computer Programming Services	$50,557,989	0.2%	Rank history: not on the FY2021–FY2025 lists; up 65 since Aug 2024–Jul 2025.
94	Partner Therapeutics, Inc. Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing	$49,999,198	0.2%	Rank history: not on the FY2021–FY2025 lists; down 26 since Aug 2024–Jul 2025.
95	NTT Data Services Federal Government, LLC Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services 541611 Administrative Management and General Management Consulting Services	$49,496,808	0.2%	Rank history: not on the FY2021–FY2024 lists and #93 in FY2025; up 44 since Aug 2024–Jul 2025.
96	A Square Group LLC Top NAICS codes 541512 Computer Systems Design Services	$48,827,303	0.2%	Rank history: not on the FY2021–FY2023 lists, #94 in FY2024 and #92 in FY2025; up 15 since Aug 2024–Jul 2025.
97	CGI Federal Inc. Top NAICS codes 541519 Other Computer Related Services 541512 Computer Systems Design Services	$48,778,534	0.2%	Rank history: not on the FY2021–FY2024 lists and #61 in FY2025; down 36 since Aug 2024–Jul 2025.
98	The Whiting-Turner Contracting Company Top NAICS codes 236220 Commercial and Institutional Building Construction	$48,664,062	0.2%	Rank history: not on the FY2021–FY2022 lists, #85 in FY2023, #87 in FY2024 and #90 in FY2025; down 14 since Aug 2024–Jul 2025.
99	Tunnell Consulting Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$47,175,197	0.2%	Rank history: not on the FY2021–FY2023 lists, #82 in FY2024 and #94 in FY2025; down 12 since Aug 2024–Jul 2025.
100	Rafa Laboratories Ltd Top NAICS codes 325412 Pharmaceutical Preparation Manufacturing 541714 Research and Development in Biotechnology (except Nanobiotechnology)	$46,830,630	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.

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 $26.3 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.
• 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