Top 100 Contractors in PSC DB10: IT and Telecom – Compute as a Service: Mainframe/Servers, FY2021

Name: Top 100 Contractors in PSC DB10: IT and Telecom – Compute as a Service: Mainframe/Servers, FY2021
Creator: GovTribe

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

The top 10 won 77% of FY2021 PSC DB10 contract dollars

Contract obligations: $164,996,457 Net of deobligations, by contracts coded PSC DB10
Contractors: 150 Parent companies with an obligation
Largest contractor: General Dynamics Corporation $53.3 million, 32.2% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	General Dynamics Corporation 3 awardees, including General Dynamics Information Technology, Inc. and Csra LLC Top agencies Navy (Department of the Navy) DISA (Defense Information Systems Agency) DOS (Department of State)	$53,337,699	32.2%	Rank history: #1 in FY2022, #2 in FY2023, #3 in FY2024 and #7 in FY2025; new, not ranked in FY2020.
2	Govplace, LLC Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$29,640,446	17.9%	Rank history: #3 in FY2022, #4 in FY2023, not on the FY2024 list and #65 in FY2025; new, not ranked in FY2020.
3	International Business Machines Corporation Top agencies RRB (Railroad Retirement Board) DOI (Department of the Interior)	$10,585,249	6.4%	Rank history: #8 in FY2022, #12 in FY2023, #28 in FY2024 and #37 in FY2025; new, not ranked in FY2020.
4	Strategic Communications LLC Top agencies HHS (Department of Health and Human Services)	$8,595,032	5.2%	Rank history: #14 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
5	Thundercat Technology, LLC Top agencies DOS (Department of State) VA (Department of Veterans Affairs) NASA (National Aeronautics and Space Administration)	$7,759,861	4.7%	Rank history: #7 in FY2022, #17 in FY2023, #29 in FY2024 and #12 in FY2025; new, not ranked in FY2020.
6	Chakrabarti Management Consultancy, Inc. Top agencies DHS (Department of Homeland Security)	$3,940,880	2.4%	Rank history: #11 in FY2022, #18 in FY2023, #23 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
7	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top agencies DOI (Department of the Interior)	$3,710,983	2.2%	Rank history: #9 in FY2022, #16 in FY2023, #71 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
8	Vion Corporation Top agencies Navy (Department of the Navy)	$3,455,625	2.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
9	Communications Training Analysis Corporation Top agencies NARA (National Archives and Records Administration)	$3,077,800	1.9%	Rank history: #4 in FY2022, #10 in FY2023, #13 in FY2024 and #13 in FY2025; new, not ranked in FY2020.
10	Ironarch Technology LLC Top agencies VA (Department of Veterans Affairs)	$2,990,052	1.8%	Rank history: #16 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
11	Amazon.com, Inc. Through Amazon Web Services, Inc. Top agencies Navy (Department of the Navy) DOD (Department of Defense) USSOCOM (United States Special Operations Command)	$2,527,756	1.5%	Rank history: #23 in FY2022, #3 in FY2023, #8 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
12	Hitachi, Ltd. 2 awardees, including Hitachi Federal Corporation and Hitachi High-Tech America, Inc. Top agencies EOP (Executive Office of the President) NASA (National Aeronautics and Space Administration)	$2,499,819	1.5%	Rank history: #27 in FY2022, #28 in FY2023, #52 in FY2024 and #45 in FY2025; new, not ranked in FY2020.
13	G2Sf LLC Top agencies DOI (Department of the Interior)	$2,200,266	1.3%	Rank history: not on the FY2022–FY2023 lists, #34 in FY2024 and #22 in FY2025; new, not ranked in FY2020.
14	V3Gate, LLC Top agencies DOJ (Department of Justice) RRB (Railroad Retirement Board)	$1,929,961	1.2%	Rank history: #19 in FY2022, #29 in FY2023, #81 in FY2024 and #84 in FY2025; new, not ranked in FY2020.
15	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies DOL (Department of Labor)	$1,841,464	1.1%	Rank history: #15 in FY2022, #27 in FY2023, #37 in FY2024 and #25 in FY2025; new, not ranked in FY2020.
16	Dell Federal Systems L.P. 2 awardees, including Dell Marketing L.P. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$1,733,073	1.0%	Rank history: #20 in FY2022, #13 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
17	Veteran Information Technologies, LLC Top agencies Navy (Department of the Navy)	$1,700,843	1.0%	Rank history: #73 in FY2022, not on the FY2023–FY2024 lists and #94 in FY2025; new, not ranked in FY2020.
18	Deloitte LLP Through Deloitte & Touche LLP Top agencies DOJ (Department of Justice)	$1,644,000	1.0%	Rank history: #26 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
19	Biospatial, Inc. Top agencies DHS (Department of Homeland Security)	$1,372,500	0.8%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
20	Autonomic Resources LLC Top agencies DOI (Department of the Interior)	$1,261,464	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
21	Simple Technology Solutions Inc. Through Applied Cloud Technologies LLC Top agencies Treasury (Department of the Treasury)	$1,189,242	0.7%	Rank history: #31 in FY2022, #38 in FY2023, #75 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
22	Netcomm, Inc. Top agencies HHS (Department of Health and Human Services)	$884,423	0.5%	Rank history: #33 in FY2022, #45 in FY2023, #55 in FY2024 and #54 in FY2025; new, not ranked in FY2020.
23	Carahsoft Technology Corp Top agencies DOI (Department of the Interior) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$872,229	0.5%	Rank history: #36 in FY2022, #56 in FY2023, #44 in FY2024 and #21 in FY2025; new, not ranked in FY2020.
24	Smartronix LLC Top agencies DOI (Department of the Interior) HHS (Department of Health and Human Services)	$845,948	0.5%	Rank history: #39 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
25	Thomas Scientific LLC Through Unison Software Inc. Top agencies EPA (Environmental Protection Agency)	$755,348	0.5%	Rank history: #41 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
26	Iron Bow Technologies, LLC Top agencies DOT (Department of Transportation) DOL (Department of Labor) VA (Department of Veterans Affairs)	$712,495	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
27	CDW Corporation Through CDW Government LLC Top agencies DOJ (Department of Justice) DOT (Department of Transportation) DOS (Department of State)	$606,938	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Blue Ivy Partners, LLC Top agencies USAF (Department of the Air Force)	$602,033	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	Bahfed Corp Top agencies DISA (Defense Information Systems Agency)	$563,766	0.3%	Rank history: #48 in FY2022, #79 in FY2023, #91 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
30	New TECH Solutions, Inc. Top agencies NASA (National Aeronautics and Space Administration) HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$560,974	0.3%	Rank history: #6 in FY2022, #6 in FY2023, #12 in FY2024 and #67 in FY2025; new, not ranked in FY2020.
31	DLT Solutions LLC Top agencies Navy (Department of the Navy)	$560,171	0.3%	Rank history: not on the FY2022 list, #99 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
32	Sterling Computers Corporation Top agencies DOJ (Department of Justice) NASA (National Aeronautics and Space Administration)	$467,527	0.3%	Rank history: #34 in FY2022, #40 in FY2023, #84 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
33	DH Technologies, Inc. Top agencies DISA (Defense Information Systems Agency)	$450,000	0.3%	Rank history: #10 in FY2022, #20 in FY2023, #41 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
34	Jasper Solutions Inc. Top agencies USAF (Department of the Air Force)	$434,278	0.3%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
35	Dynamic Systems Inc. Top agencies DOE (Department of Energy) NASA (National Aeronautics and Space Administration)	$357,793	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Hewlett Packard Enterprise Co Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture) Navy (Department of the Navy)	$355,954	0.2%	Rank history: #49 in FY2022, #50 in FY2023, #49 in FY2024 and #43 in FY2025; new, not ranked in FY2020.
37	Nana Regional Corporation Inc Through Affigent, LLC Top agencies USDA (Department of Agriculture)	$331,234	0.2%	Rank history: not on the FY2022 list, #42 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
38	Espy LLC Top agencies DOJ (Department of Justice)	$303,007	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Identiv, Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts)	$286,537	0.2%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
40	Metgreen Solutions Inc. Top agencies DOJ (Department of Justice)	$271,714	0.2%	Rank history: not on the FY2022–FY2023 lists, #68 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
41	Trofholz Technologies, Inc. Top agencies VA (Department of Veterans Affairs)	$254,635	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	Computer Security Solutions, LLC Top agencies DOS (Department of State)	$251,150	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Achieveit Online LLC Top agencies VA (Department of Veterans Affairs)	$237,433	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	Trace3 Government, LLC Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$236,957	0.1%	Rank history: #38 in FY2022, #62 in FY2023, #50 in FY2024 and #47 in FY2025; new, not ranked in FY2020.
45	Software Information Resource Corp. Top agencies Commerce (Department of Commerce) NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$234,011	0.1%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
46	Govsmart, Inc. Top agencies DOI (Department of the Interior) DOL (Department of Labor) DOS (Department of State)	$231,874	0.1%	Rank history: #57 in FY2022, #57 in FY2023, #92 in FY2024 and #59 in FY2025; new, not ranked in FY2020.
47	Sirsi Corporation Top agencies DTRA (Defense Threat Reduction Agency) NASA (National Aeronautics and Space Administration)	$226,874	0.1%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
48	Alpha Facilities Solutions, LLC Top agencies DODEA (Department of Defense Education Activity)	$216,966	0.1%	Rank history: #70 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
49	Rexel Inc. Through Rexel Usa, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$210,914	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	CA Inc. Top agencies RRB (Railroad Retirement Board)	$195,215	0.1%	Rank history: #46 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
51	Viasat Inc. Top agencies Navy (Department of the Navy)	$192,520	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
52	Clinicomp International Inc. Top agencies VA (Department of Veterans Affairs)	$191,871	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	FS Partners, LLP Top agencies DHS (Department of Homeland Security)	$188,560	0.1%	Rank history: not on the FY2022–FY2023 lists, #38 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
54	Arrow Electronics, Inc. 2 awardees, including Immixtechnology Inc. and EC America, Inc. Top agencies RRB (Railroad Retirement Board) USAF (Department of the Air Force)	$188,174	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Dspace Beta Beteiligungsges. MBH Through Dspace Inc. Top agencies NASA (National Aeronautics and Space Administration)	$182,684	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Providence ST Joseph Health Through Providence Health & Services-Washington Top agencies HHS (Department of Health and Human Services)	$166,478	0.1%	Rank history: #58 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
57	CACI International Inc. Through Caci Nss, LLC Top agencies NARA (National Archives and Records Administration)	$159,873	0.1%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
58	Blue TECH Inc. Top agencies DHS (Department of Homeland Security) NASA (National Aeronautics and Space Administration)	$153,024	0.1%	Rank history: #51 in FY2022, #78 in FY2023, #64 in FY2024 and #61 in FY2025; new, not ranked in FY2020.
59	Regan Technologies Corp Top agencies DOJ (Department of Justice)	$151,336	0.1%	Rank history: #21 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
60	Disys Solutions, Inc. Top agencies NASA (National Aeronautics and Space Administration) DHA (Defense Health Agency) DOT (Department of Transportation)	$139,643	0.1%	Rank history: #95 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
61	Alvarez LLC Top agencies DISA (Defense Information Systems Agency)	$136,674	0.1%	Rank history: #55 in FY2022, #70 in FY2023, #88 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
62	Enterprise Technology Solutions, Inc. Top agencies RRB (Railroad Retirement Board) NASA (National Aeronautics and Space Administration) DOE (Department of Energy)	$125,051	0.1%	Rank history: #52 in FY2022, #85 in FY2023, #69 in FY2024 and #93 in FY2025; new, not ranked in FY2020.
63	Red River Technology LLC Top agencies CFTC (Commodity Futures Trading Commission)	$122,309	0.1%	Rank history: #44 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
64	Wildflower International, Ltd. Top agencies Army (Department of the Army)	$119,932	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Minburn Technology Group, LLC Top agencies DFAS (Defense Finance and Accounting Service)	$109,359	0.1%	Rank history: #22 in FY2022, #23 in FY2023, #17 in FY2024 and #19 in FY2025; new, not ranked in FY2020.
66	Alliance Technology Group, LLC Top agencies Treasury (Department of the Treasury)	$107,918	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	MVP Network Consulting LLC Top agencies Army (Department of the Army)	$105,999	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Avnet Inc. Top agencies NASA (National Aeronautics and Space Administration)	$93,625	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Kpaul Properties LLC Top agencies Navy (Department of the Navy)	$92,744	0.1%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
70	DS Government Solutions Corp Top agencies NASA (National Aeronautics and Space Administration)	$91,759	0.1%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
71	Colossal Contracting LLC Top agencies RRB (Railroad Retirement Board) DOI (Department of the Interior)	$82,275	<0.1%	Rank history: #85 in FY2022, not on the FY2023 list, #58 in FY2024 and #40 in FY2025; new, not ranked in FY2020.
72	Unicom Global Inc. Through Unicom Systems Inc. Top agencies HHS (Department of Health and Human Services)	$77,098	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Mythics, LLC Through Emergent, LLC Top agencies DOE (Department of Energy)	$73,010	<0.1%	Rank history: #53 in FY2022, #81 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
74	Architechture Solutions LLC Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$71,685	<0.1%	Rank history: #68 in FY2022, #88 in FY2023, #97 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
75	4 Star Technologies, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$71,319	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Interoperable Systems Group LLC Top agencies Navy (Department of the Navy)	$68,661	<0.1%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
77	August Schell Enterprises, Inc. Top agencies Navy (Department of the Navy)	$68,378	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Westwind Computer Products, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$66,003	<0.1%	Rank history: #75 in FY2022, #94 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
79	Lyme Computer Systems, Inc. Top agencies DOE (Department of Energy) DOJ (Department of Justice) Army (Department of the Army)	$62,816	<0.1%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
80	Certent, Inc. Top agencies DISA (Defense Information Systems Agency)	$62,551	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	N-Ovation Technology Group LLC Top agencies DHA (Defense Health Agency)	$59,840	<0.1%	Rank history: #86 in FY2022, not on the FY2023–FY2024 lists and #98 in FY2025; new, not ranked in FY2020.
82	Norseman Inc. Top agencies Navy (Department of the Navy)	$58,819	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Fcn, Inc. Top agencies DOJ (Department of Justice) NASA (National Aeronautics and Space Administration) DOS (Department of State)	$58,336	<0.1%	Rank history: #17 in FY2022, #33 in FY2023, #51 in FY2024 and #64 in FY2025; new, not ranked in FY2020.
84	Meridian It Inc. Top agencies DOT (Department of Transportation)	$52,715	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Istor Solutions LLC Top agencies HHS (Department of Health and Human Services)	$51,921	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Aberdeen LLC Top agencies Navy (Department of the Navy)	$49,892	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Federal Resources Corporation Top agencies NASA (National Aeronautics and Space Administration)	$48,990	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Tyler Federal, LLC Top agencies DOS (Department of State)	$48,252	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Frontier Communications Corporation Through Navajo Communications Co., Inc. Top agencies DOI (Department of the Interior)	$48,218	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Innovative Collaboration Inc. Top agencies DHA (Defense Health Agency)	$47,919	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Cadapult, Limited Top agencies FCC (Federal Communications Commission)	$44,500	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Coverttrack Group Inc. Top agencies DOJ (Department of Justice)	$40,500	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Countertrade Products, Inc. Top agencies RRB (Railroad Retirement Board)	$39,802	<0.1%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
94	6Branches Inc. Top agencies Treasury (Department of the Treasury)	$39,600	<0.1%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
95	Orbcomm, Inc. Top agencies DHS (Department of Homeland Security)	$37,500	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Aurora Systems Consulting Inc. Top agencies NASA (National Aeronautics and Space Administration) Commerce (Department of Commerce)	$37,473	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Paragon Micro Inc. Top agencies HHS (Department of Health and Human Services)	$35,549	<0.1%	Rank history: not on the FY2022 list, #98 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
98	Accessagility LLC Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$33,390	<0.1%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
99	KT Corporation Top agencies USAF (Department of the Air Force)	$32,016	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Panamerica Computers, Inc. 2 awardees Top agencies NASA (National Aeronautics and Space Administration)	$31,660	<0.1%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.

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100 of 150 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 $166 million 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 PSC DB10 contractors in FY2021?

1. General Dynamics Corporation ($53.3M), 2. Govplace, LLC ($29.6M), 3. International Business Machines Corporation ($10.6M), 4. Strategic Communications LLC ($8.6M), 5. Thundercat Technology, LLC ($7.76M), 6. Chakrabarti Management Consultancy, Inc. ($3.94M), 7. CGI Technologies and Solutions Inc. ($3.71M), 8. Vion Corporation ($3.46M), 9. Communications Training Analysis Corporation ($3.08M), 10. Ironarch Technology LLC ($2.99M).

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