The Largest Government Consulting Firms

Updated Oct 19, 2026

In the 12 months to Oct 19, 2026, federal agencies obligated $13.9 billion in consulting contracts. The largest consulting firms were Deloitte ($834.7 million), Guidehouse ($626.7 million) and Booz Allen Hamilton ($514.9 million). The 10 largest took 23%; small businesses won 48%.

Top 100 government consulting firms, last 12 months

1. Deloitte $834.7 million · 6.0%
2. Guidehouse $626.7 million · 4.5%
3. Booz Allen Hamilton $514.9 million · 3.7%
4. LMI Consulting, LLC $339.2 million · 2.4%
5. General Dynamics Corporation $330.1 million · 2.4%
6. Research Triangle Institute $147.3 million · 1.1%
7. ICF Incorporated, L.L.C. $123.0 million · 0.9%
8. Serco Inc $112.2 million · 0.8%
9. Kelly Services, Inc. $104.7 million · 0.8%
10. BCG Federal Corp. $99.0 million · 0.7%
11. SAIC $98.9 million · 0.7%
12. GAP Solutions, Inc. $83.5 million · 0.6%
13. Maximus Federal Services, Inc. $75.2 million · 0.5%
14. National Collegiate Inventors & Innovators Alliance, Inc. $68.3 million · 0.5%
15. Mathematica Inc. $67.8 million · 0.5%
16. Kearney & Company, P.C. $67.4 million · 0.5%
17. Vernadero Group Inc $64.8 million · 0.5%
18. Magellan Federal, Inc. $62.8 million · 0.5%
19. Sapient Government Services, Inc. $62.8 million · 0.5%
20. Acumen LLC $60.3 million · 0.4%
21. Tunnell Consulting Inc $60.0 million · 0.4%
22. System High Corporation $58.7 million · 0.4%
23. Creative IT Solutions LLC $57.6 million · 0.4%
24. Eastern Research Group Inc $53.6 million · 0.4%
25. Empower AI, Inc. $53.4 million · 0.4%
26. Westat, Inc. $53.1 million · 0.4%
27. 360 Patriot Enterprises LLC $49.5 million · 0.4%
28. Gulf South Research Corp $49.3 million · 0.4%
29. Family Health International $49.0 million · 0.4%
30. ADC Ltd NM $47.5 million · 0.3%
31. Vector Resource Inc $46.8 million · 0.3%
32. Project Enhancement Corporation $46.8 million · 0.3%
33. C2C Innovative Solutions, Inc. $46.7 million · 0.3%
34. Jones Lang Lasalle Americas, Inc. $45.9 million · 0.3%
35. Kaiva Strategies, LLC $44.3 million · 0.3%
36. Goldbelt Professional Services, LLC $44.2 million · 0.3%
37. Ernst & Young LLP $43.1 million · 0.3%
38. C2 Alaska, LLC $42.9 million · 0.3%
39. Kadiak LLC $42.9 million · 0.3%
40. Stafford Consulting Company, Inc. $42.6 million · 0.3%
41. Unwin Co $42.2 million · 0.3%
42. Tribility LLC $41.5 million · 0.3%
43. Battelle Memorial Institute $41.4 million · 0.3%
44. Pundir Group, Inc $41.0 million · 0.3%
45. Tetra Tech, Inc. $40.4 million · 0.3%
46. Calibre Systems Inc $40.2 million · 0.3%
47. Titan Alpha LLC $38.7 million · 0.3%
48. Aptive HTG LLC $38.6 million · 0.3%
49. Mckinsey & Company, Inc. Washington D.C. $38.4 million · 0.3%
50. Fedwriters, Inc. $38.3 million · 0.3%
51. American Institutes For Research IN The Behavioral Sciences $38.2 million · 0.3%
52. Axle Informatics, LLC $38.1 million · 0.3%
53. Lockheed Martin Corporation $37.8 million · 0.3%
54. Nakupuna Solutions, LLC $37.6 million · 0.3%
55. Threat TEC, LLC $37.1 million · 0.3%
56. National Opinion Research Center $37.1 million · 0.3%
57. ABT Global LLC $36.8 million · 0.3%
58. Your Recruiting Company, Inc. $36.6 million · 0.3%
59. Parsons Government Services Inc. $36.4 million · 0.3%
60. Skyward Dynamics Information Technology, LLC $36.0 million · 0.3%
61. Censeo Consulting Group, Inc. $35.2 million · 0.3%
62. Wits Solutions Inc. $34.7 million · 0.2%
63. Prometheus Federal Services LLC $34.3 million · 0.2%
64. Management Science And Innovation, LLC $34.0 million · 0.2%
65. Tria Federal, LLC $33.8 million · 0.2%
66. Agile4Vets LLC $33.7 million · 0.2%
67. Saliense Consulting LLC $33.6 million · 0.2%
68. Trilogy Federal, LLC $33.3 million · 0.2%
69. Palantir USG Inc $33.3 million · 0.2%
70. Lynker Corporation $33.3 million · 0.2%
71. Tatitlek Federal Services LLC $33.0 million · 0.2%
72. Harvard Pilgrim Health Care, Inc. $32.9 million · 0.2%
73. Island Peer Review Organization Inc $32.7 million · 0.2%
74. Titan-Auxo, LLC $32.2 million · 0.2%
75. Noblis, Inc. $31.9 million · 0.2%
76. V2X Aerospace LLC $31.1 million · 0.2%
77. Accenture Federal Services $31.0 million · 0.2%
78. Mantech Advanced Systems International, Inc. $30.9 million · 0.2%
79. United Network For Organ Sharing $30.9 million · 0.2%
80. Xtreme Solutions Inc $30.6 million · 0.2%
81. Sancorp Consulting, LLC $30.4 million · 0.2%
82. JBS International, Inc. $29.4 million · 0.2%
83. Colsa Corp $29.3 million · 0.2%
84. Bixal Solutions Incorporated $29.3 million · 0.2%
85. Celerity Government Solutions LLC $29.2 million · 0.2%
86. Credence Management Solutions Limited Liability Company $29.0 million · 0.2%
87. Huron Consulting Services LLC $28.9 million · 0.2%
88. Goldpath Communications JV LLC $28.7 million · 0.2%
89. S C & A Inc $28.5 million · 0.2%
90. Michael Stapleton Associates, Ltd. $28.3 million · 0.2%
91. Analytic Services Inc. $27.5 million · 0.2%
92. Think-Highpoint JV, LLC $27.4 million · 0.2%
93. PAE Government Services, Inc. $27.2 million · 0.2%
94. Valletta Industries, Inc. $26.9 million · 0.2%
95. Intelliware Systems Inc $26.9 million · 0.2%
96. Systems Planning And Analysis, Inc. $26.5 million · 0.2%
97. Essex Management LLC $26.3 million · 0.2%
98. The Cadmus Group LLC $26.1 million · 0.2%
99. ECO & Associates, Inc. $26.1 million · 0.2%
100. National Academy Of Sciences $25.9 million · 0.2%

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By trade

• Administrative Management and General Management Consulting Services $9.7 billion in 12 months · 65 open now
• Other Scientific and Technical Consulting Services $1.9 billion in 12 months · 13 open now
• Environmental Consulting Services $1.1 billion in 12 months · 13 open now
• Human Resources Consulting Services $753.4 million in 12 months · 3 open now
• Other Management Consulting Services $261.1 million in 12 months · 2 open now
• Marketing Consulting Services $159.3 million in 12 months · 1 open now

How this list is made

From USAspending.gov's public award data, read Oct 19, 2026: contract obligations in the last 12 months under the trade (NAICS) codes for consulting. A company's registrations under its own name are added together, and the divisions of the largest groups count under the group (Electric Boat under General Dynamics, Raytheon under RTX). Obligations include changes to older contracts. Updated every week. See also the 100 largest government contractors across all agencies.

Questions

Who are the largest government consulting firms?

Deloitte ($834.7 million), Guidehouse ($626.7 million) and Booz Allen Hamilton ($514.9 million), by contract obligations in the 12 months to Oct 19, 2026.

How much goes to small businesses?

$6.7 billion, 48% of $13.9 billion, by USAspending.gov's business-size tags.