Top 100 Contractors in PSC DG01: IT and Telecom – Network Support Services (Labor), FY2021

Name: Top 100 Contractors in PSC DG01: IT and Telecom – Network Support Services (Labor), FY2021
Creator: GovTribe

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

The top 10 won 62% of FY2021 PSC DG01 contract dollars

Contract obligations: $997,320,657 Net of deobligations, by contracts coded PSC DG01
Contractors: 333 Parent companies with an obligation
Largest contractor: Vectrus Systems Corporation $183 million, 16.6% 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	Vectrus Systems Corporation Through V2X Systems LLC Top agencies Army (Department of the Army)	$183,116,285	16.6%	Rank history: #2 in FY2022, #2 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
2	General Dynamics Corporation 4 awardees, including General Dynamics Information Technology, Inc. and General Dynamics Mission Systems, Inc. Top agencies Army (Department of the Army) DISA (Defense Information Systems Agency) Navy (Department of the Navy)	$131,817,145	11.9%	Rank history: #3 in FY2022, #5 in FY2023, #4 in FY2024 and #3 in FY2025; new, not ranked in FY2020.
3	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies DISA (Defense Information Systems Agency) Navy (Department of the Navy)	$125,358,607	11.3%	Rank history: #1 in FY2022, #1 in FY2023, #3 in FY2024 and #4 in FY2025; new, not ranked in FY2020.
4	Perspecta Inc. 2 awardees, including Peraton Enterprise Solutions LLC and Knight Point Systems, LLC Top agencies Navy (Department of the Navy) DISA (Defense Information Systems Agency)	$92,134,197	8.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
5	At&T Inc. 7 awardees, including At&T Enterprises, LLC, Bellsouth Telecommunications, LLC and Att Mobility LLC Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) DOJ (Department of Justice)	$46,618,914	4.2%	Rank history: #11 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
6	Koniag, Inc. 2 awardees, including Tuknik Government Services LLC and Pacarctic, LLC Top agencies SSA (Social Security Administration) DOS (Department of State)	$23,708,486	2.1%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
7	Seneca Global Services LLC Top agencies DOJ (Department of Justice)	$23,492,236	2.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
8	Advanced Technology Systems Inc. Through Salient Crgt, Inc. Top agencies VA (Department of Veterans Affairs)	$21,701,039	2.0%	Rank history: not on the FY2022 list, #11 in FY2023, #9 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
9	Northrop Grumman Corporation 3 awardees, including Northrop Grumman Systems Corporation Top agencies SSA (Social Security Administration) Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$20,167,820	1.8%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
10	Jacobs Engineering Group Inc. Through Amentum Technology, Inc. Top agencies USSOCOM (United States Special Operations Command)	$19,357,955	1.8%	Rank history: #9 in FY2022, #3 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
11	Deloitte LLP Through Deloitte Consulting LLP Top agencies Treasury (Department of the Treasury) HHS (Department of Health and Human Services)	$17,946,922	1.6%	Rank history: #12 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
12	Dell Federal Systems L.P. 2 awardees, including Dell Marketing L.P. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) Army (Department of the Army)	$16,427,529	1.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
13	Tsymmetry Inc. Top agencies DOS (Department of State)	$15,295,475	1.4%	Rank history: #24 in FY2022, #19 in FY2023, #50 in FY2024 and #92 in FY2025; new, not ranked in FY2020.
14	By Light Professional It Services LLC Through Phacil, LLC Top agencies DISA (Defense Information Systems Agency)	$14,605,621	1.3%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
15	On Assignment, Inc. Through ECS Federal, LLC Top agencies DOJ (Department of Justice)	$12,183,672	1.1%	Rank history: not on the FY2022 list, #21 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
16	Science Applications International Corporation 2 awardees Top agencies DOT (Department of Transportation) Navy (Department of the Navy) USAF (Department of the Air Force)	$11,011,835	1.0%	Rank history: #7 in FY2022, #7 in FY2023, #6 in FY2024 and #7 in FY2025; new, not ranked in FY2020.
17	Technica Corporation Top agencies USAF (Department of the Air Force) DOJ (Department of Justice)	$10,503,904	1.0%	Rank history: #19 in FY2022, #41 in FY2023, #81 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
18	Bering Straits Native Corporation Through Bering Global Solutions, LLC Top agencies OPM (Office of Personnel Management)	$10,150,338	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	Arlington Capital Partners IV, L.P. 3 awardees, including Tyto Athene, LLC, Tyto Government Solutions Inc. and Mutual Telecom Services Inc. Top agencies Navy (Department of the Navy) DOT (Department of Transportation) DOE (Department of Energy)	$9,937,368	0.9%	Rank history: #33 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
20	CACI International Inc. 2 awardees, including Caci, Inc. - Federal and Caci Nss, LLC Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture)	$9,858,339	0.9%	Rank history: #5 in FY2022, #25 in FY2023, #2 in FY2024 and #2 in FY2025; new, not ranked in FY2020.
21	Open San Consulting L.L.C. Top agencies OSD (Office of the Secretary of Defense)	$8,591,026	0.8%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
22	Lumen Technologies, Inc. 4 awardees, including Level 3 Telecom Holdings, LLC, Lumen Technologies Government Solutions, Inc. and Level 3 Communications, LLC Top agencies HHS (Department of Health and Human Services) DCSA (Defense Counterintelligence and Security Agency) DOJ (Department of Justice)	$8,523,870	0.8%	Rank history: #14 in FY2022, #16 in FY2023, #25 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
23	HP Enterprise Services LLC 2 awardees, including Knight Point Systems, LLC Top agencies DISA (Defense Information Systems Agency)	$7,542,713	0.7%	Rank history: #6 in FY2022, #4 in FY2023, #19 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
24	Guidehouse Inc. Top agencies HHS (Department of Health and Human Services)	$7,020,564	0.6%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
25	Telos Corporation Top agencies USAF (Department of the Air Force)	$6,869,302	0.6%	Rank history: not on the FY2022–FY2024 lists and #98 in FY2025; new, not ranked in FY2020.
26	Plateau Software, Inc. Top agencies DLA (Defense Logistics Agency)	$6,428,647	0.6%	Rank history: #26 in FY2022, #43 in FY2023, #77 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
27	Fcn, Inc. Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury) Navy (Department of the Navy)	$6,037,696	0.5%	Rank history: #47 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
28	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$6,004,032	0.5%	Rank history: #15 in FY2022, #23 in FY2023, #30 in FY2024 and #34 in FY2025; new, not ranked in FY2020.
29	Kupono Government Services, LLC Top agencies Army (Department of the Army)	$4,856,211	0.4%	Rank history: #27 in FY2022, #40 in FY2023, #48 in FY2024 and #49 in FY2025; new, not ranked in FY2020.
30	Leader Communications Inc. Top agencies Army (Department of the Army)	$4,817,369	0.4%	Rank history: #17 in FY2022, #24 in FY2023, #37 in FY2024 and #65 in FY2025; new, not ranked in FY2020.
31	Delta Bridge, Inc. Top agencies DOS (Department of State)	$4,774,585	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Logc2 Inc. Top agencies DLA (Defense Logistics Agency)	$4,112,029	0.4%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
33	Vangarde Llc. Top agencies USAF (Department of the Air Force)	$3,744,385	0.3%	Rank history: #55 in FY2022, not on the FY2023 list, #96 in FY2024 and #91 in FY2025; new, not ranked in FY2020.
34	Verizon Business Network Services LLC Top agencies Commerce (Department of Commerce)	$3,587,730	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	SDA Solutions LLC Top agencies Navy (Department of the Navy)	$3,497,132	0.3%	Rank history: #53 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
36	Norseman Inc. Top agencies DISA (Defense Information Systems Agency)	$3,350,236	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
37	CA Inc. Top agencies SSA (Social Security Administration)	$3,221,615	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Idera, Inc. Through Precise Software Solutions, Inc. Top agencies HHS (Department of Health and Human Services)	$2,974,601	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Gstek, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$2,972,456	0.3%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
40	BAE Systems PLC Through BAE Systems Technology Solutions & Services Inc. Top agencies DHS (Department of Homeland Security)	$2,774,427	0.3%	Rank history: #61 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
41	MCS of Tampa, Inc. Top agencies SBA (Small Business Administration) USAF (Department of the Air Force)	$2,741,513	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	CMA Technology Inc. Top agencies DISA (Defense Information Systems Agency)	$2,648,974	0.2%	Rank history: #54 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
43	Transvoyant LLC. Top agencies Army (Department of the Army)	$2,493,843	0.2%	Rank history: #68 in FY2022, #94 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
44	H.i.g. Capital Management Inc. Through Empower AI, Inc. Top agencies Navy (Department of the Navy)	$2,457,445	0.2%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
45	DNI Emerging Technologies, LLC Top agencies HHS (Department of Health and Human Services)	$2,408,001	0.2%	Rank history: #70 in FY2022, #97 in FY2023, #64 in FY2024 and #47 in FY2025; new, not ranked in FY2020.
46	International Business Machines Corporation Top agencies DISA (Defense Information Systems Agency) HHS (Department of Health and Human Services) NARA (National Archives and Records Administration)	$2,361,561	0.2%	Rank history: #42 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
47	Valkyrie Enterprises, LLC Top agencies USAF (Department of the Air Force)	$2,334,324	0.2%	Rank history: #52 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
48	International Business Sales and Services Corp Top agencies Commerce (Department of Commerce)	$2,215,703	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	Teksynap Corporation Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$2,186,318	0.2%	Rank history: #65 in FY2022, #75 in FY2023, #44 in FY2024 and #35 in FY2025; new, not ranked in FY2020.
50	Allegiance Supply, Inc. Top agencies Navy (Department of the Navy)	$2,180,430	0.2%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
51	Microsoft Corporation Top agencies USAF (Department of the Air Force) DOT (Department of Transportation)	$2,100,282	0.2%	Rank history: #22 in FY2022, #33 in FY2023, #95 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
52	Verizon Communications Inc. 4 awardees, including Verizon Business Network Services LLC, Verizon Federal Inc. and Cellco Partnership Top agencies Commerce (Department of Commerce) Navy (Department of the Navy) DOJ (Department of Justice)	$2,080,438	0.2%	Rank history: #4 in FY2022, #6 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
53	Insight Public Sector Inc. 2 awardees Top agencies Navy (Department of the Navy) RRB (Railroad Retirement Board)	$1,762,732	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Intuitive Information Systems Technologies LLC Top agencies DHS (Department of Homeland Security)	$1,716,997	0.2%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
55	Bristol Bay Native Corporation Through Gc&E Systems Group, LLC Top agencies Army (Department of the Army)	$1,626,638	0.1%	Rank history: #32 in FY2022, #32 in FY2023, #47 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
56	Telecom Italia SPA Through Telecom Italia SPA O TIM S.P.A. Top agencies Navy (Department of the Navy)	$1,624,638	0.1%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
57	Peraton Inc. Through Peraton Enterprise Solutions LLC Top agencies Navy (Department of the Navy)	$1,619,563	0.1%	Rank history: not on the FY2022–FY2023 lists, #1 in FY2024 and #1 in FY2025; new, not ranked in FY2020.
58	Global Com, Inc. Top agencies USDA (Department of Agriculture)	$1,588,549	0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
59	Conceras LLC Top agencies Navy (Department of the Navy)	$1,540,044	0.1%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
60	Nana Regional Corporation Inc 2 awardees, including Tuva LLC and Affigent, LLC Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) Army (Department of the Army)	$1,523,895	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Full Spectrum Operations LLC Top agencies VA (Department of Veterans Affairs)	$1,490,898	0.1%	Rank history: #97 in FY2022, not on the FY2023–FY2024 lists and #55 in FY2025; new, not ranked in FY2020.
62	Digitalibiz, LLC Top agencies Peace Corps	$1,476,784	0.1%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
63	American Systems Corporation Top agencies USAF (Department of the Air Force)	$1,459,122	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Allscripts Healthcare Solutions Inc. Through Veradigm LLC Top agencies HHS (Department of Health and Human Services)	$1,421,518	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Infotrend Incorporated Top agencies HHS (Department of Health and Human Services)	$1,317,705	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Allstream Business US LLC Through Zayo Group LLC Top agencies HHS (Department of Health and Human Services)	$1,206,509	0.1%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
67	Agileana Digital Services Inc. Top agencies FCC (Federal Communications Commission)	$1,203,633	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Huna Totem Corp Through Distributed Computing System Solutions Provider, Inc. Top agencies Commerce (Department of Commerce)	$1,086,847	0.1%	Rank history: #76 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
69	The Centech Group Inc. Top agencies USAF (Department of the Air Force)	$1,065,170	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Motorola Inc Through Motorola Solutions, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$1,064,500	0.1%	Rank history: #96 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
71	Creative Business Solutions, Inc. Top agencies Navy (Department of the Navy) NSF (National Science Foundation)	$1,046,579	0.1%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
72	Perrygo Consulting Group, LLC Top agencies Navy (Department of the Navy)	$1,000,000	0.1%	Rank history: not on the FY2022 list, #62 in FY2023, #67 in FY2024 and #38 in FY2025; new, not ranked in FY2020.
73	Tnda Technologies Inc. Top agencies Army (Department of the Army)	$997,909	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Carahsoft Technology Corp Top agencies Commerce (Department of Commerce) Navy (Department of the Navy) DOL (Department of Labor)	$977,964	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	The Mitre Corporation Top agencies DHS (Department of Homeland Security)	$957,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	SPN Solutions Inc. Top agencies Navy (Department of the Navy)	$930,200	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	22Nd Century Technologies, Inc. Top agencies DLA (Defense Logistics Agency)	$904,212	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Netizen Corporation Top agencies Army (Department of the Army)	$852,559	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	JFL Consulting, LLC Top agencies Navy (Department of the Navy)	$840,320	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Epoch Concepts LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$812,908	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Telefonica, SA Through Telefonica De Espana Sau Top agencies Navy (Department of the Navy)	$807,650	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	CDW Corporation Through CDW Government LLC Top agencies USAF (Department of the Air Force)	$804,078	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Remedy Technological Services, LP Top agencies Army (Department of the Army)	$792,502	0.1%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
84	C & C International Computers & Consultants, Inc. Top agencies DHS (Department of Homeland Security)	$767,663	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Itfrastructure, Inc. Top agencies USAGM (US Agency for Global Media)	$758,230	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Cynergy Professional Systems LLC Top agencies DOT (Department of Transportation) DOE (Department of Energy) VA (Department of Veterans Affairs)	$744,651	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	ICF International, Inc. Through Incentive Technology Group LLC Top agencies GSA (General Services Administration)	$714,795	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Healtheway, Inc. Top agencies VA (Department of Veterans Affairs)	$650,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Alvarez LLC Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) NASA (National Aeronautics and Space Administration)	$630,686	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Medtel Services, LLC Top agencies DOJ (Department of Justice)	$615,338	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Westwind Computer Products, Inc. Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services)	$598,187	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Fedstore Corporation Top agencies VA (Department of Veterans Affairs)	$592,099	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	EPS Corporation Top agencies USAF (Department of the Air Force) SSA (Social Security Administration)	$581,992	0.1%	Rank history: not on the FY2022–FY2024 lists and #100 in FY2025; new, not ranked in FY2020.
94	RTX Corporation Through Arinc Incorporated Top agencies DOT (Department of Transportation) USAF (Department of the Air Force) Army (Department of the Army)	$576,797	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Gc&E Federal, LLC Top agencies Army (Department of the Army)	$523,772	<0.1%	Rank history: #64 in FY2022, not on the FY2023–FY2024 lists and #72 in FY2025; new, not ranked in FY2020.
96	Nova-Dine LLC Through North Stone LLC Top agencies DHA (Defense Health Agency)	$502,418	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	ICS Nett Inc. Top agencies DOJ (Department of Justice)	$502,284	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	G-Star Telecom, Inc. Top agencies Treasury (Department of the Treasury)	$499,883	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Corp Ten International Through DTC Communications, Inc. Top agencies DOJ (Department of Justice)	$499,482	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Cherokee Nation Through Cherokee Federal Solutions, L.L.C. Top agencies USAF (Department of the Air Force)	$498,879	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 333 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 $1.11 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 PSC DG01 contractors in FY2021?

1. Vectrus Systems Corporation ($183M), 2. General Dynamics Corporation ($132M), 3. Leidos Holdings, Inc. ($125M), 4. Perspecta Inc. ($92.1M), 5. At&T Inc. ($46.6M), 6. Koniag, Inc. ($23.7M), 7. Seneca Global Services LLC ($23.5M), 8. Advanced Technology Systems Inc. ($21.7M), 9. Northrop Grumman Corporation ($20.2M), 10. Jacobs Engineering Group Inc. ($19.4M).

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