Top 100 Contractors in PSC R4: Professional Services, Jul 2025–Jun 2026

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 22% of PSC R4 contract dollars from July 2025 through June 2026

Contract obligations
$77,780,930,431 Net of deobligations, by contracts coded PSC R4 or a code under it
Contractors
9,171 Parent companies with an obligation
Largest contractor
Booz Allen Hamilton Holding Corporation $3.36 billion, 4.0% of obligations
Data as of

Contract actions from FPDS (SAM.gov). How the rankings work · Download · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank Contractor Net obligations Share Trend
1
Booz Allen Hamilton Holding Corporation 8 awardees, including Booz Allen Hamilton Inc., Ultra Electronics Advanced Tactical Systems Inc. and IAN Evan & Alexander Corp
Top agencies
$3,363,667,360
2
The Boeing Company 23 awardees, including Boeing Sikorsky Aircraft Support, LLC
Top agencies
$3,039,171,323
3
CACI International Inc. 12 awardees, including Caci, Inc. - Federal, Caci Technologies, LLC and Caci Nss, LLC
Top agencies
$1,861,209,366
4
Science Applications International Corporation 4 awardees, including Forfeiture Support Associates LLC
Top agencies
$1,693,366,527
5
General Dynamics Corporation 25 awardees, including General Dynamics Information Technology, Inc., General Dynamics Land Systems Inc. and General Dynamics Global Force, LLC
Top agencies
$1,665,078,320
6
Lockheed Martin Corporation 31 awardees, including Lockheed Martin Services, LLC
Top agencies
$1,573,024,470
7
Amentum Holdings, Inc. 18 awardees, including Amentum Services, Inc., Amentum Technology, Inc. and JT4 LLC
Top agencies
$1,411,105,958
8
Northrop Grumman Systems Corporation 35 awardees
Top agencies
$1,381,205,990
9
RTX Corporation 76 awardees, including Raytheon Company, Rockwell Collins, Inc. and Raytheon Southeast Asia Systems Company
Top agencies
$1,374,962,160
10
Deloitte 3 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP
Top agencies
$1,341,369,219
11
Leidos Holdings, Inc. 15 awardees, including Leidos, Inc., Dynetics, Inc. and Hanford Mission Integration Solutions, LLC
Top agencies
$1,293,363,368
12
The Aerospace Corporation
Top agencies
$1,257,146,784
13
Savannah River Mission Completion, LLC
Top agencies
$1,168,123,719
14
Huntington Ingalls Industries, Inc. 7 awardees, including HII Mission Technologies Corp, HII Technical Solutions Corporation and HII Fleet Support Group LLC
Top agencies
$1,160,783,843
15
Accenture Federal Services LLC 5 awardees, including Cognosante MVH LLC and Cognosante, LLC
Top agencies
$1,027,889,647
16
Serco Inc 2 awardees
Top agencies
$904,485,650
17
Maximus Federal Services, Inc.
Top agencies
$864,153,546
18
V2X, Inc. 6 awardees, including V2X Aerospace LLC, V2X Systems LLC and Vertex Modernization and Sustainment LLC
Top agencies
$843,852,878
19
Parsons Corporation 7 awardees, including Parsons Government Services Inc., Xator LLC and Altamira Technologies Corp
Top agencies
$824,738,904
20
Guidehouse Inc. 12 awardees, including Peraton Inc., Peraton Enterprise Solutions LLC and Peraton Technology Services Inc.
Top agencies
$807,296,697
21
The Mitre Corporation 2 awardees
Top agencies
$764,890,805
22
Chemonics International, Inc.
Top agencies
$744,735,910
23
BAE Systems 19 awardees, including BAE Systems Information and Electronic Systems Integration Inc., BAE Systems Technology Solutions & Services Inc. and BAE Systems Land and Armaments L.P.
Top agencies
$730,498,926
24
General Atomics Aeronautical Systems, Inc.
Top agencies
$593,461,882
25
L3Harris Technologies, Inc. 28 awardees, including L3Harris Technologies Integrated Systems L.P., L3 Technologies, Inc. and Harris Corporation
Top agencies
$566,772,050
26
Salient Crgt, Inc.
Top agencies
$527,997,648
27
Peraton Inc. 3 awardees, including Safeguard Services LLC and Peraton Enterprise Solutions LLC
Top agencies
$450,999,297
28
Beyond New Horizons, LLC
Top agencies
$435,621,915
29
Odyssey Systems Consulting Group, Ltd.
Top agencies
$424,488,435
30
Arctic Slope Regional Corporation 21 awardees, including Agile Decision Sciences, LLC, Netcentric Technology, LLC and Asrc Federal Technology Solutions, LLC
Top agencies
$418,037,841
31
Smartronix, LLC
Top agencies
$413,655,754
32
LMI Consulting, LLC
Top agencies
$398,128,868
33
ManTech International Corporation 2 awardees, including Mantech Advanced Systems International, Inc. and Unison Software Inc.
Top agencies
$354,137,727
34
Microsoft Corporation 2 awardees
Top agencies
$342,781,417
35
KBR Wyle Services LLC 7 awardees, including KBR Services, LLC
Top agencies
$329,168,795
36
Systems Planning and Analysis, Inc.
Top agencies
$318,869,526
37
Leonardo S.p.A. 7 awardees, including DRS Sustainment Systems, Inc., Laurel Technologies Partnership and DRS Network & Imaging Systems LLC
Top agencies
$314,716,437
38
Torch Technologies Inc.
Top agencies
$310,892,785
39
Acacia Center for Justice
Top agencies
$281,280,919
40
Scientific Research Corporation
Top agencies
$259,156,537
41
The GEO Group, Inc. 2 awardees, including B.i. Incorporated
Top agencies
$241,802,544
42
Intuitive Research and Technology Corporation
Top agencies
$233,099,381
43
Carrington Mortgage Services LLC
Top agencies
$224,463,968
44
Carahsoft Technology Corp
Top agencies
$214,341,409
45
SRC Inc.
Top agencies
$212,962,947
46
Clark Construction LLC Through Clark Construction Group LLC
Top agencies
$212,693,510
47
Family Health International
Top agencies
$203,014,346
48
International Business Machines Corporation 5 awardees
Top agencies
$199,987,330
49
Linquest Corporation
Top agencies
$184,630,265
50
Tetra Tech, Inc. 21 awardees, including LS Technologies LLC, Bluewater Federal Solutions, Inc. and Management Systems International, Inc.
Top agencies
$183,411,937
51
Inter-CON Security Systems Inc.
Top agencies
$182,550,440
52
The Timken Company Through CGI Federal Inc.
Top agencies
$181,362,833
53
BCG Federal Corp.
Top agencies
$177,261,958
54
Bowman Consulting Group Ltd. 2 awardees, including Westland Resources Inc.
Top agencies
$176,988,364
55
Oasis Systems, LLC
Top agencies
$176,958,214
56
BAE Systems Land & Armaments L.P.
Top agencies
$175,479,900
57
Trace Systems, Inc.
Top agencies
$163,258,371
58
Halvik LLC
Top agencies
$162,464,588
59
Johns Hopkins University 3 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC and The Johns Hopkins Health System Corporation
Top agencies
$162,079,962
60
Modern Technology Solutions, Inc.
Top agencies
$157,726,544
61
Noblis, Inc.
Top agencies
$156,356,415
62
Research Triangle Institute
Top agencies
$155,344,686
63
Oshkosh Corporation Through Oshkosh Defense LLC
Top agencies
$153,402,490
64
Kbr, Inc. 3 awardees, including KBR Wyle Services, LLC
Top agencies
$153,067,010
65
Soldierpoint Digital Health, LLC
Top agencies
$146,493,689
66
Path
Top agencies
$135,062,532
67
P E Systems, Inc.
Top agencies
$134,155,374
68
True North Communications Inc.
Top agencies
$133,642,390
69
Applied Research Associates, Inc.
Top agencies
$131,567,192
70
360 Patriot Enterprises LLC
Top agencies
$130,507,377
71
CQ JV, LLC
Top agencies
$129,669,003
72
Sev1Tech, LLC
Top agencies
$128,422,874
73
Cherokee Nation 12 awardees, including Cherokee Nation Strategic Programs, L.L.C., Cherokee Nation Defense Solutions LLC and Cherokee Nation Integrated Health, L.L.C.
Top agencies
$128,097,056
74
ABT Global LLC
Top agencies
$126,164,602
75
Mag DS Corp
Top agencies
$124,999,067
76
Anduril Industries Inc. 3 awardees, including Area-I, LLC
Top agencies
$124,515,694
77
QED Systems LLC
Top agencies
$123,082,658
78
Credence Management Solutions Limited Liability Company
Top agencies
$121,394,504
79
Signature Choice II, LLC
Top agencies
$119,758,352
80
Trax International Corporation
Top agencies
$118,230,298
81
Precise Systems, Inc.
Top agencies
$116,107,026
82
Ameresco Inc. 2 awardees, including Ameresco Select, Inc.
Top agencies
$114,430,381
83
Georgia TECH Applied Research Corp
Top agencies
$113,515,529
84
Consortium Management Group, Inc.
Top agencies
$111,571,492
85
Govcio, LLC
Top agencies
$111,243,170
86
Bwxt Enrichment Operations, LLC
Top agencies
$110,377,952
87
BC Partners LLP Through Gardaworld Federal Services LLC
Top agencies
$108,971,246
88
Asgn Incorporated Through ECS Federal, LLC
Top agencies
$108,423,236
89
Strategic Analysis, Inc.
Top agencies
$108,211,956
90
Securitas Critical Infrastructure Services Inc. Through Paragon Systems Inc.
Top agencies
$106,507,115
91
ICF International Inc. 4 awardees, including ICF Incorporated, L.L.C. and Incentive Technology Group LLC
Top agencies
$104,714,929
92
DCS Corporation
Top agencies
$104,519,767
93
Apogee Engineering, LLC
Top agencies
$104,475,647
94
Bowhead Program Management & Operations, LLC
Top agencies
$104,308,733
95
Credence Dynamo Solutions LLC
Top agencies
$103,667,521
96
Sigmatech Inc.
Top agencies
$102,277,082
97
Westat, Inc. 2 awardees, including Insight Policy Research, Inc.
Top agencies
$100,480,649
98
It Concepts, Inc.
Top agencies
$99,454,506
99
Strategic Resources, Incorporated
Top agencies
$99,398,849
100
CGI Federal Inc. 2 awardees, including Sehlke Consulting LLC
Top agencies
$99,107,861
Show 75 more

100 of 9,171 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC R4

Code Net obligations Largest contractor
R425 Engineering and Technical Services $33,766,704,680 Northrop Grumman Systems Corporation
R499 Other Professional Services $27,466,581,215 The Boeing Company
R408 Program Management/Support Services $9,883,464,880 Booz Allen Hamilton Holding Corporation
R423 Intelligence Services $1,131,302,685 Smartronix, LLC
R430 Support – Professional: Physical Security and Badging $998,999,141 Inter-CON Security Systems Inc.
R418 Legal Services $702,920,705 Acacia Center for Justice
R410 Support – Professional: Program Evaluation/Review/Development $629,994,683 Booz Allen Hamilton Holding Corporation
R426 Communications Services $552,141,941 True North Communications Inc.
R431 Support – Professional: Human Resources $356,781,269 Deloitte
R405 Operations Research and Quantitative Analysis Services $301,709,713 Human Resources Research Organization (Humrro)
R429 Support – Professional: Emergency Response/Disaster Planning/Preparedness Support $292,438,429 Life Science Logistics LLC
R422 Market Research and Public Opinion Services (includes telephone and field interviews, focus testing, and surveys) $219,974,621 Westat, Inc.
R411 Real Property Appraisals Services (SIC 6531) $204,006,085 Bowman Consulting Group Ltd.
R412 Simulation $188,452,046 CAE Inc.
R424 Expert Witness $170,281,866 Georgia TECH Applied Research Corp
R416 Veterinary/Animal Care Services $135,234,105 JS Technology, Inc.
R497 Personal Services Contracts $131,992,084 Iron Vine Security LLC
R427 Weather Reporting/Observation Services $117,767,741 Vero Technical Support Inc
R406 Policy Review/Development Services $90,594,418 Intelligent Technology, LLC
R401 Personal Care Services (includes such services as barber and beauty shop, shoe repairs, tailoring, etc.) $52,872,942 Family Endeavors, Inc.
R420 Support – Professional: Certifications and Accreditations (Other Than Education or Information Technology C&A) $49,813,911 Joint Commission On Accreditation of Healthcare Organizations
R402 Real Estate Brokerage Services $38,478,806 Vendor Resource Management, Inc.
R404 Land Surveys, Cadastral Services (non-construction) $15,278,449 Woolpert, Inc.
R428 Industrial Hygienics $10,552,940 Dgi-Ati II LLC

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 $83.3 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. 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 Jul 2024–Jun 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 PSC R4 contractors in Jul 2025–Jun 2026?

1. Booz Allen Hamilton Holding Corporation ($3.36B), 2. The Boeing Company ($3.04B), 3. CACI International Inc. ($1.86B), 4. Science Applications International Corporation ($1.69B), 5. General Dynamics Corporation ($1.67B), 6. Lockheed Martin Corporation ($1.57B), 7. Amentum Holdings, Inc. ($1.41B), 8. Northrop Grumman Systems Corporation ($1.38B), 9. RTX Corporation ($1.37B), 10. Deloitte ($1.34B).

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