Top 100 Contractors in NAICS 541511: Custom Computer Programming Services, FY2021

Name: Top 100 Contractors in NAICS 541511: Custom Computer Programming Services, FY2021
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 32% of FY2021 NAICS 541511 contract dollars

Contract obligations: $8,753,433,589 Net of deobligations, by contracts coded NAICS 541511
Contractors: 2,075 Parent companies with an obligation
Largest contractor: General Dynamics Corporation $623 million, 6.8% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	General Dynamics Corporation 10 awardees, including Csra LLC, General Dynamics Information Technology, Inc. and General Dynamics Mission Systems, Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$623,089,526	6.8%	Rank history: #2 in FY2022, #2 in FY2023, #1 in FY2024 and #1 in FY2025; up 1 since FY2020.
2	Booz Allen Hamilton Holding Corporation 4 awardees, including Booz Allen Hamilton Inc. and Aquilent, Inc. Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force) NSF (National Science Foundation)	$428,550,200	4.7%	Rank history: #1 in FY2022, #1 in FY2023, #2 in FY2024 and #2 in FY2025; down 1 since FY2020.
3	Lockheed Martin Corporation 9 awardees Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) USSOCOM (United States Special Operations Command)	$411,789,296	4.5%	Rank history: #3 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; unchanged since FY2020.
4	CACI International Inc. 7 awardees, including Caci-Iss, LLC, Caci, Inc. - Federal and Caci Technologies, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$310,630,979	3.4%	Rank history: #5 in FY2022, #4 in FY2023, #29 in FY2024 and #5 in FY2025; up 2 since FY2020.
5	Nippon Telegraph and Telephone Corporation 2 awardees, including NTT Data Federal Services, Inc. and NTT Data Services Federal Government, LLC Top agencies DOJ (Department of Justice) USAID (US Agency for International Development) DOI (Department of the Interior)	$249,106,403	2.7%	Rank history: #4 in FY2022, #12 in FY2023, #78 in FY2024 and not on the FY2025 list; up 2 since FY2020.
6	Leidos Holdings, Inc. 5 awardees, including Leidos, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$247,433,033	2.7%	Rank history: #8 in FY2022, #7 in FY2023, #21 in FY2024 and #42 in FY2025; down 2 since FY2020.
7	Northrop Grumman Corporation 12 awardees, including Northrop Grumman Systems Corporation Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$228,715,903	2.5%	Rank history: #6 in FY2022, #5 in FY2023, #5 in FY2024 and #8 in FY2025; down 2 since FY2020.
8	Nana Regional Corporation Inc 4 awardees, including Sava Workforce Solutions LLC, Tuva LLC and Tuvli LLC Top agencies DOJ (Department of Justice) Army (Department of the Army)	$168,361,252	1.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
9	International Business Machines Corporation 4 awardees Top agencies SSA (Social Security Administration) HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$153,428,204	1.7%	Rank history: #10 in FY2022, #6 in FY2023, #4 in FY2024 and #4 in FY2025; up 4 since FY2020.
10	On Assignment, Inc. 3 awardees, including ECS Federal, LLC, Indrasoft Inc. and Inforeliance LLC Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice) USAF (Department of the Air Force)	$136,095,120	1.5%	Rank history: #9 in FY2022, #11 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
11	RTX Corporation 20 awardees, including Raytheon Company, Solipsys Corporation and RTX BBN Technologies, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) Commerce (Department of Commerce)	$115,431,440	1.3%	Rank history: #12 in FY2022, #14 in FY2023, #27 in FY2024 and #15 in FY2025; up 9 since FY2020.
12	L3Harris Technologies, Inc. 10 awardees, including L3Harris Forcex, Inc., L3 Technologies, Inc. and L3Harris Linchpin Labs, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$102,007,261	1.1%	Rank history: #19 in FY2022, #8 in FY2023, #6 in FY2024 and #16 in FY2025; down 2 since FY2020.
13	Guidehouse Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) DOS (Department of State)	$89,501,018	1.0%	Rank history: #22 in FY2022, #28 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
14	Parsons Corporation 3 awardees, including Polaris Alpha, LLC and Parsons Government Services Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) GSA (General Services Administration)	$86,778,652	1.0%	Rank history: #36 in FY2022, #55 in FY2023, #71 in FY2024 and #50 in FY2025; down 6 since FY2020.
15	Microsoft Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$86,392,923	0.9%	Rank history: #7 in FY2022, #10 in FY2023, #94 in FY2024 and not on the FY2025 list; down 4 since FY2020.
16	Mantech International Corporation 2 awardees, including Mantech Advanced Systems International, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$74,225,419	0.8%	Rank history: not on the FY2022 list, #50 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
17	Alethix, LLC Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture) USAF (Department of the Air Force)	$71,135,911	0.8%	Rank history: #15 in FY2022, #37 in FY2023, #51 in FY2024 and not on the FY2025 list; up 20 since FY2020.
18	Planned Systems International Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) USAID (US Agency for International Development)	$69,390,955	0.8%	Rank history: #26 in FY2022, #31 in FY2023, #45 in FY2024 and #46 in FY2025; up 7 since FY2020.
19	Decibel Research, Inc. Top agencies MDA (DOD Missile Defense Agency)	$68,378,482	0.7%	Rank history: not on the FY2022–FY2025 lists; up 68 since FY2020.
20	Creative Systems and Consulting L.L.C. Top agencies USDA (Department of Agriculture) Treasury (Department of the Treasury) HHS (Department of Health and Human Services)	$67,436,423	0.7%	Rank history: #99 in FY2022, not on the FY2023 list, #41 in FY2024 and #55 in FY2025; up 48 since FY2020.
21	Synergy Business Innovation & Solutions Inc. Top agencies DHS (Department of Homeland Security)	$63,750,452	0.7%	Rank history: #30 in FY2022, #39 in FY2023, #38 in FY2024 and not on the FY2025 list; up 2 since FY2020.
22	Sapient Corporation Through Sapient Government Services, Inc. Top agencies HHS (Department of Health and Human Services) CPSC (Consumer Product Safety Commission)	$63,261,295	0.7%	Rank history: #18 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
23	Rei Systems, Inc. Top agencies HHS (Department of Health and Human Services) GSA (General Services Administration) DOJ (Department of Justice)	$60,282,509	0.7%	Rank history: not on the FY2022–FY2023 lists, #28 in FY2024 and #34 in FY2025; up 113 since FY2020.
24	Softrams LLC Top agencies HHS (Department of Health and Human Services)	$59,263,152	0.6%	Rank history: #23 in FY2022, #18 in FY2023, #11 in FY2024 and #10 in FY2025; down 5 since FY2020.
25	Spatial Front Inc. Top agencies Commerce (Department of Commerce) USDA (Department of Agriculture) DOT (Department of Transportation)	$53,045,129	0.6%	Rank history: #14 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
26	Karsun Solutions LLC Top agencies DHS (Department of Homeland Security) GSA (General Services Administration)	$49,959,774	0.5%	Rank history: #24 in FY2022, #27 in FY2023, #46 in FY2024 and not on the FY2025 list; down 4 since FY2020.
27	HP Enterprise Services LLC 4 awardees, including Peraton Technology Services Inc., Peraton Inc. and Peraton Enterprise Solutions LLC Top agencies DOS (Department of State) GSA (General Services Administration) USAF (Department of the Air Force)	$49,761,638	0.5%	Rank history: #17 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; up 269 since FY2020.
28	Science Applications International Corporation 7 awardees, including Engility Services, LLC Top agencies Commerce (Department of Commerce) USAF (Department of the Air Force) Treasury (Department of the Treasury)	$48,587,356	0.5%	Rank history: #20 in FY2022, #23 in FY2023, #23 in FY2024 and #18 in FY2025; up 58 since FY2020.
29	Maximus Federal Technology Solutions, LLC Top agencies DHS (Department of Homeland Security) WHS (DOD Washington Headquarters Service) DOE (Department of Energy)	$47,970,870	0.5%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
30	Sabel Systems Technology Solutions, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) WHS (DOD Washington Headquarters Service)	$44,442,760	0.5%	Rank history: #33 in FY2022, #21 in FY2023, #32 in FY2024 and #29 in FY2025; up 71 since FY2020.
31	Securigence LLC Top agencies DARPA (Defense Advanced Research Projects Agency)	$41,472,139	0.5%	Rank history: #13 in FY2022, #16 in FY2023, #9 in FY2024 and #7 in FY2025; new, not ranked in FY2020.
32	Sev1Tech, LLC Top agencies DHS (Department of Homeland Security)	$40,682,972	0.4%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
33	Diversified Technical Services, Inc. Top agencies USAF (Department of the Air Force) DISA (Defense Information Systems Agency)	$40,468,143	0.4%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
34	Slalom, Inc. Top agencies DHS (Department of Homeland Security)	$38,499,204	0.4%	Rank history: #88 in FY2022, #51 in FY2023, #52 in FY2024 and not on the FY2025 list; up 10 since FY2020.
35	The Boeing Company 8 awardees, including Tapestry Solutions, Inc., Jeppesen Foreflight, Inc. and Millennium Space Systems, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$37,911,523	0.4%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
36	Ad Hoc LLC Top agencies HHS (Department of Health and Human Services) OPM (Office of Personnel Management)	$37,718,692	0.4%	Rank history: #40 in FY2022, #54 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
37	ICF International, Inc. 2 awardees, including ICF Incorporated, L.L.C. and Incentive Technology Group LLC Top agencies HHS (Department of Health and Human Services) SSA (Social Security Administration) GSA (General Services Administration)	$35,352,822	0.4%	Rank history: #16 in FY2022, #13 in FY2023, #92 in FY2024 and not on the FY2025 list; up 32 since FY2020.
38	J.r. Reingold & Associates, Inc. Top agencies VA (Department of Veterans Affairs) ED (Department of Education) DHA (Defense Health Agency)	$35,184,876	0.4%	Rank history: #93 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
39	Directviz Solutions, LLC Top agencies DOS (Department of State) Navy (Department of the Navy) GSA (General Services Administration)	$34,178,663	0.4%	Rank history: not on the FY2022–FY2024 lists and #77 in FY2025; up 134 since FY2020.
40	Icr, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DARPA (Defense Advanced Research Projects Agency)	$32,515,694	0.4%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; up 371 since FY2020.
41	Revolutional, LLC Top agencies USDA (Department of Agriculture) CFPB (Consumer Financial Protection Bureau) Commerce (Department of Commerce)	$32,484,359	0.4%	Rank history: #62 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
42	Remedybiz, Inc. Top agencies HHS (Department of Health and Human Services)	$32,244,133	0.4%	Rank history: #59 in FY2022, #82 in FY2023, #76 in FY2024 and not on the FY2025 list; up 22 since FY2020.
43	Pyramid Systems, Inc. Top agencies HUD (Department of Housing and Urban Development)	$31,699,708	0.3%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
44	Oddball, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$31,660,794	0.3%	Rank history: #39 in FY2022, #32 in FY2023, #20 in FY2024 and #25 in FY2025; up 13 since FY2020.
45	Mi Technical Solutions, Inc. Top agencies Navy (Department of the Navy)	$31,063,812	0.3%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; up 35 since FY2020.
46	Ventera LLC Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) DHS (Department of Homeland Security)	$29,598,865	0.3%	Rank history: #61 in FY2022, not on the FY2023 list, #79 in FY2024 and not on the FY2025 list; down 1 since FY2020.
47	Deloitte LLP 2 awardees, including Deloitte Consulting LLP and Deloitte & Touche LLP Top agencies Navy (Department of the Navy) ED (Department of Education) OSD (Office of the Secretary of Defense)	$28,801,408	0.3%	Rank history: #83 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; up 47 since FY2020.
48	Nava PBC Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$28,755,519	0.3%	Rank history: #54 in FY2022, #45 in FY2023, #25 in FY2024 and #23 in FY2025; down 10 since FY2020.
49	Flexion Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior) GSA (General Services Administration)	$28,498,976	0.3%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; up 3 since FY2020.
50	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior) Army (Department of the Army)	$28,199,709	0.3%	Rank history: #70 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; up 269 since FY2020.
51	Datum Software, Inc. Top agencies USAF (Department of the Air Force)	$28,008,517	0.3%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
52	Macaulay-Brown Inc. Through Enlighten It Consulting LLC Top agencies USAF (Department of the Air Force) DISA (Defense Information Systems Agency)	$27,287,597	0.3%	Rank history: #41 in FY2022, #49 in FY2023 and not on the FY2024–FY2025 lists; up 182 since FY2020.
53	Ready Computing Inc. Top agencies VA (Department of Veterans Affairs)	$26,678,756	0.3%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
54	Accenture Federal Services LLC 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) NARA (National Archives and Records Administration)	$26,561,749	0.3%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; down 26 since FY2020.
55	Array Information Technology Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$25,980,450	0.3%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
56	Applied Enterprise Management Corporation Top agencies ED (Department of Education) Smithsonian (Smithsonian Institution)	$25,857,738	0.3%	Rank history: #63 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
57	Koniag, Inc. 4 awardees, including Arlluk Technology Solutions LLC, Koniag Technology Solutions Inc. and Eagle Harbor Solutions LLC Top agencies DISA (Defense Information Systems Agency) USDA (Department of Agriculture) DOS (Department of State)	$25,319,664	0.3%	Rank history: #31 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; down 17 since FY2020.
58	Halvik LLC Top agencies DOT (Department of Transportation) Commerce (Department of Commerce) DOS (Department of State)	$24,773,282	0.3%	Rank history: #45 in FY2022, #56 in FY2023, #57 in FY2024 and #48 in FY2025; up 31 since FY2020.
59	Pluribus Digital, Inc. Top agencies DHS (Department of Homeland Security)	$24,535,904	0.3%	Rank history: #52 in FY2022, #63 in FY2023, #96 in FY2024 and #80 in FY2025; up 18 since FY2020.
60	Idera, Inc. Through Precise Software Solutions, Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$23,756,161	0.3%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; up 40 since FY2020.
61	Highrise Consulting Inc. Top agencies HHS (Department of Health and Human Services)	$23,631,467	0.3%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; down 30 since FY2020.
62	Reston Consulting Group, Inc. Top agencies Treasury (Department of the Treasury) Commerce (Department of Commerce)	$23,513,763	0.3%	Rank history: #55 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
63	Frontier Technology Inc. Top agencies USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service) Navy (Department of the Navy)	$23,319,321	0.3%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; down 42 since FY2020.
64	Sehlke Consulting LLC Top agencies Navy (Department of the Navy)	$23,045,806	0.3%	Rank history: #37 in FY2022, #33 in FY2023, #44 in FY2024 and not on the FY2025 list; up 69 since FY2020.
65	Ardent Management Consulting, LLC Top agencies DHS (Department of Homeland Security) SSA (Social Security Administration) DOT (Department of Transportation)	$22,946,533	0.3%	Rank history: #86 in FY2022, #70 in FY2023, #63 in FY2024 and not on the FY2025 list; unchanged since FY2020.
66	Utah State University Through Utah State University Space Dynamics Laboratory Top agencies USAF (Department of the Air Force)	$22,936,975	0.3%	Rank history: #50 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; up 19 since FY2020.
67	SRA International Inc. Through General Dynamics Information Technology, Inc. Top agencies Navy (Department of the Navy)	$22,619,797	0.2%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
68	ACE Info Solutions LLC 2 awardees, including Guidehouse Digital LLC Top agencies USDA (Department of Agriculture)	$22,299,035	0.2%	Rank history: #85 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 56 since FY2020.
69	Dynanet Corporation Top agencies DCSA (Defense Counterintelligence and Security Agency) HHS (Department of Health and Human Services)	$21,744,460	0.2%	Rank history: not on the FY2022 list, #84 in FY2023, not on the FY2024 list and #79 in FY2025; up 106 since FY2020.
70	Definitive Logic Corporation Top agencies USAF (Department of the Air Force)	$21,700,757	0.2%	Rank history: not on the FY2022–FY2025 lists; up 251 since FY2020.
71	Tetra Tech, Inc. Through Segue Technologies, Inc. Top agencies USAF (Department of the Air Force) DOI (Department of the Interior)	$21,460,985	0.2%	Rank history: #78 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 32 since FY2020.
72	Innovasystems International LLC Top agencies Navy (Department of the Navy) DHRA (Defense Human Resources Activity)	$21,418,467	0.2%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
73	Omni Fed LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHA (Defense Health Agency)	$21,207,447	0.2%	Rank history: #29 in FY2022, #26 in FY2023, #24 in FY2024 and #28 in FY2025; up 148 since FY2020.
74	Creative It Solutions LLC Top agencies DISA (Defense Information Systems Agency) USAF (Department of the Air Force) Army (Department of the Army)	$21,096,176	0.2%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; down 15 since FY2020.
75	Perspecta Inc. 3 awardees, including Peraton Technology Services Inc. and Peraton Enterprise Solutions LLC Top agencies USAF (Department of the Air Force) GSA (General Services Administration) DISA (Defense Information Systems Agency)	$21,046,351	0.2%	Rank history: not on the FY2022–FY2025 lists; down 42 since FY2020.
76	Epigen Technology Corp. Top agencies DLA (Defense Logistics Agency)	$20,703,528	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	Revacomm Inc. Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force) Navy (Department of the Navy)	$20,605,366	0.2%	Rank history: #34 in FY2022, #48 in FY2023 and not on the FY2024–FY2025 lists; up 74 since FY2020.
78	Arctic Slope Mission Services LLC Top agencies DOJ (Department of Justice) USDA (Department of Agriculture)	$20,460,740	0.2%	Rank history: #65 in FY2022, #86 in FY2023, #95 in FY2024 and not on the FY2025 list; down 7 since FY2020.
79	Assured Information Security, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$20,398,724	0.2%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
80	Broadleaf, Inc. Top agencies Army (Department of the Army) DISA (Defense Information Systems Agency)	$19,699,117	0.2%	Rank history: not on the FY2022–FY2025 lists; down 27 since FY2020.
81	Paradyme Solutions, LLC Top agencies Commerce (Department of Commerce)	$19,524,876	0.2%	Rank history: not on the FY2022–FY2025 lists; up 71 since FY2020.
82	Tripoint Solutions, LLC Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) DFAS (Defense Finance and Accounting Service)	$19,328,724	0.2%	Rank history: not on the FY2022–FY2025 lists; up 45 since FY2020.
83	Humanit Solutions LLC Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$18,980,565	0.2%	Rank history: #48 in FY2022, #87 in FY2023, not on the FY2024 list and #94 in FY2025; up 10 since FY2020.
84	Dsfederal, Inc. Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$18,594,537	0.2%	Rank history: not on the FY2022–FY2025 lists; up 41 since FY2020.
85	Concept Solutions LLC Top agencies DOT (Department of Transportation)	$18,429,467	0.2%	Rank history: #67 in FY2022, #41 in FY2023, #43 in FY2024 and #44 in FY2025; down 34 since FY2020.
86	TCG Inc. Top agencies EOP (Executive Office of the President) GSA (General Services Administration) Treasury (Department of the Treasury)	$18,019,592	0.2%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; down 30 since FY2020.
87	Nimbus Consulting LLC Top agencies HHS (Department of Health and Human Services)	$17,899,427	0.2%	Rank history: not on the FY2022–FY2025 lists; up 23 since FY2020.
88	Fearless Solutions, LLC Top agencies HHS (Department of Health and Human Services) OSD (Office of the Secretary of Defense) GSA (General Services Administration)	$17,646,876	0.2%	Rank history: #35 in FY2022, #43 in FY2023, #36 in FY2024 and not on the FY2025 list; up 10 since FY2020.
89	Quiet Professionals, LLC Top agencies USSOCOM (United States Special Operations Command) DHS (Department of Homeland Security) DOS (Department of State)	$17,621,032	0.2%	Rank history: not on the FY2022–FY2023 lists, #99 in FY2024 and #96 in FY2025; up 76 since FY2020.
90	PCI Professional Services, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$17,612,349	0.2%	Rank history: #87 in FY2022, #65 in FY2023, #98 in FY2024 and not on the FY2025 list; up 5 since FY2020.
91	Network Designs, Inc. Top agencies DOT (Department of Transportation)	$17,035,541	0.2%	Rank history: not on the FY2022–FY2025 lists; down 24 since FY2020.
92	Chenega Professional & Technical Services LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency) DOE (Department of Energy)	$16,938,876	0.2%	Rank history: #80 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
93	Artel LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$16,481,937	0.2%	Rank history: not on the FY2022–FY2025 lists; down 67 since FY2020.
94	PTC Inc. Top agencies Navy (Department of the Navy)	$16,258,751	0.2%	Rank history: not on the FY2022–FY2025 lists; up 120 since FY2020.
95	Techflow, Inc. Top agencies DHS (Department of Homeland Security) GSA (General Services Administration)	$16,041,590	0.2%	Rank history: not on the FY2022–FY2025 lists; up 72 since FY2020.
96	Medical Science & Computing, LLC Top agencies HHS (Department of Health and Human Services)	$15,986,169	0.2%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
97	Riva Solutions Inc. Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$15,737,329	0.2%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
98	LS Technologies LLC Top agencies DOT (Department of Transportation)	$15,718,718	0.2%	Rank history: not on the FY2022–FY2025 lists; up 36 since FY2020.
99	Communications Resource Inc. Top agencies DOS (Department of State)	$15,624,572	0.2%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; down 15 since FY2020.
100	BAE Systems PLC 3 awardees, including BAE Systems Information and Electronic Systems Integration Inc. and BAE Systems Technology Solutions & Services Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$15,456,330	0.2%	Rank history: not on the FY2022–FY2025 lists; down 51 since FY2020.

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100 of 2,075 contractors listed here. See the rest on GovTribe.

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 $9.13 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.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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 541511 contractors in FY2021?

1. General Dynamics Corporation ($623M), 2. Booz Allen Hamilton Holding Corporation ($429M), 3. Lockheed Martin Corporation ($412M), 4. CACI International Inc. ($311M), 5. Nippon Telegraph and Telephone Corporation ($249M), 6. Leidos Holdings, Inc. ($247M), 7. Northrop Grumman Corporation ($229M), 8. Nana Regional Corporation Inc ($168M), 9. International Business Machines Corporation ($153M), 10. On Assignment, Inc. ($136M).

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