Top 100 Contractors in PSC DD01: IT and Telecom – Service Delivery Support Services: ITSM, Operations Center, Project/PM (Labor), FY2021

Name: Top 100 Contractors in PSC DD01: IT and Telecom – Service Delivery Support Services: ITSM, Operations Center, Project/PM (Labor), FY2021
Creator: GovTribe

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

The top 10 won 49% of FY2021 PSC DD01 contract dollars

Contract obligations: $918,951,724 Net of deobligations, by contracts coded PSC DD01
Contractors: 460 Parent companies with an obligation
Largest contractor: At&T Inc. $143 million, 15.0% 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	At&T Inc. 11 awardees, including At&T Enterprises, LLC, Att Mobility LLC and At&T Mobility National Accounts LLC Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation) DISA (Defense Information Systems Agency)	$142,512,648	15.0%	Rank history: #1 in FY2022, #7 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
2	Leonardo S.p.A. Through Global Enterprise Solutions, Inc. Top agencies USSOCOM (United States Special Operations Command) Army (Department of the Army) Navy (Department of the Navy)	$110,452,283	11.6%	Rank history: #33 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
3	General Dynamics Corporation 2 awardees, including General Dynamics Information Technology, Inc. and General Dynamics Mission Systems, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$78,310,794	8.2%	Rank history: #2 in FY2022, #4 in FY2023, #2 in FY2024 and #1 in FY2025; new, not ranked in FY2020.
4	Four Points Technology, L.L.C. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$22,504,064	2.4%	Rank history: #22 in FY2022, #12 in FY2023, #36 in FY2024 and #77 in FY2025; new, not ranked in FY2020.
5	Deloitte LLP Through Deloitte Consulting LLP Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$22,096,602	2.3%	Rank history: #98 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
6	Change Healthcare Technologies LLC 2 awardees, including Change Healthcare Holdings, Inc. Top agencies VA (Department of Veterans Affairs)	$19,767,009	2.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
7	HP Enterprise Services LLC 4 awardees, including Peraton Enterprise Solutions LLC, Peraton Technology Services Inc. and Onsolve LLC Top agencies DHRA (Defense Human Resources Activity) DISA (Defense Information Systems Agency) Army (Department of the Army)	$19,456,919	2.0%	Rank history: #7 in FY2022, #9 in FY2023, #82 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
8	Qbase, LLC Top agencies OSD (Office of the Secretary of Defense)	$17,733,704	1.9%	Rank history: #17 in FY2022, #23 in FY2023, #23 in FY2024 and #23 in FY2025; new, not ranked in FY2020.
9	Creative It Solutions LLC Top agencies DCAA (Defense Contract Audit Agency)	$16,790,096	1.8%	Rank history: #15 in FY2022, #24 in FY2023, #19 in FY2024 and #20 in FY2025; new, not ranked in FY2020.
10	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies FTC (Federal Trade Commission) NRC (Nuclear Regulatory Commission)	$16,464,000	1.7%	Rank history: #5 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; new, not ranked in FY2020.
11	CACI International Inc. 2 awardees, including Caci Nss, LLC and Caci Enterprise Solutions, LLC Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$15,946,898	1.7%	Rank history: #11 in FY2022, #18 in FY2023, not on the FY2024 list and #18 in FY2025; new, not ranked in FY2020.
12	Lumen Technologies, Inc. 3 awardees, including Lumen Technologies Government Solutions, Inc. and Level 3 Communications, LLC Top agencies VA (Department of Veterans Affairs) OPM (Office of Personnel Management) USAF (Department of the Air Force)	$14,457,326	1.5%	Rank history: #78 in FY2022, #2 in FY2023, #12 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
13	C4 Planning Solutions, LLC Top agencies Navy (Department of the Navy)	$14,265,493	1.5%	Rank history: #16 in FY2022, #20 in FY2023, #17 in FY2024 and #17 in FY2025; new, not ranked in FY2020.
14	Blue TECH Inc. Top agencies Commerce (Department of Commerce) DHS (Department of Homeland Security)	$14,067,137	1.5%	Rank history: #10 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
15	Bristol Bay Native Corporation Through Glacier Technologies LLC Top agencies USDA (Department of Agriculture)	$12,637,360	1.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
16	Verizon Communications Inc. 5 awardees, including Verizon Business Network Services LLC, MCI Communications Services LLC and Cellco Partnership Top agencies DISA (Defense Information Systems Agency) Army (Department of the Army) VA (Department of Veterans Affairs)	$12,259,252	1.3%	Rank history: #6 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
17	Accenture Federal Services LLC 2 awardees Top agencies Treasury (Department of the Treasury) DOI (Department of the Interior) USDA (Department of Agriculture)	$10,086,653	1.1%	Rank history: #30 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
18	Thundercat Technology, LLC Top agencies Commerce (Department of Commerce) DHS (Department of Homeland Security) DOL (Department of Labor)	$9,888,232	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	Vista Defense Technologies, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$8,975,012	0.9%	Rank history: #18 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
20	Whirlwind Technologies LLC Top agencies Commerce (Department of Commerce)	$8,849,074	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
21	At&T Enterprises, LLC Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy)	$8,431,478	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
22	Booz Allen Hamilton Holding Corporation 2 awardees, including Booz Allen Hamilton Inc. and Middle Bay Solutions II, LLC Top agencies Navy (Department of the Navy) HHS (Department of Health and Human Services) DLA (Defense Logistics Agency)	$7,653,858	0.8%	Rank history: #4 in FY2022, #10 in FY2023, #9 in FY2024 and #5 in FY2025; new, not ranked in FY2020.
23	Motorola Inc Through Motorola Solutions, Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security)	$7,419,887	0.8%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
24	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top agencies Commerce (Department of Commerce) DHS (Department of Homeland Security)	$7,393,416	0.8%	Rank history: #26 in FY2022, #32 in FY2023, #56 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
25	Iron Vine Security LLC Top agencies Commerce (Department of Commerce)	$7,365,054	0.8%	Rank history: #12 in FY2022, not on the FY2023 list, #14 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
26	Microhealth LLC Top agencies HHS (Department of Health and Human Services)	$7,258,275	0.8%	Rank history: #34 in FY2022, #25 in FY2023, #18 in FY2024 and #25 in FY2025; new, not ranked in FY2020.
27	Telos Corporation Top agencies USSOCOM (United States Special Operations Command)	$6,992,581	0.7%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
28	Alethix, LLC Top agencies DHS (Department of Homeland Security)	$6,460,615	0.7%	Rank history: #21 in FY2022, #29 in FY2023, #21 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
29	Quantrum LLC Top agencies USAF (Department of the Air Force)	$6,344,922	0.7%	Rank history: #61 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
30	Information Technology Strategies, Inc. Top agencies DLA (Defense Logistics Agency)	$5,985,418	0.6%	Rank history: #59 in FY2022, #99 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
31	New River Systems Corporation Top agencies DLA (Defense Logistics Agency)	$5,982,101	0.6%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
32	TCG Inc. Top agencies MCC (Millennium Challenge Corporation) Treasury (Department of the Treasury)	$5,942,415	0.6%	Rank history: #29 in FY2022, #45 in FY2023, #39 in FY2024 and #66 in FY2025; new, not ranked in FY2020.
33	Teksynap Corporation Top agencies DTRA (Defense Threat Reduction Agency) DOJ (Department of Justice)	$5,897,003	0.6%	Rank history: #44 in FY2022, #33 in FY2023, #40 in FY2024 and #43 in FY2025; new, not ranked in FY2020.
34	KVH Industries Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$5,829,585	0.6%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
35	Science Applications International Corporation 2 awardees Top agencies Commerce (Department of Commerce) DOT (Department of Transportation)	$5,548,309	0.6%	Rank history: #20 in FY2022, #5 in FY2023, #4 in FY2024 and #3 in FY2025; new, not ranked in FY2020.
36	Mantech International Corporation Through Mantech Advanced Systems International, Inc. Top agencies DHS (Department of Homeland Security)	$5,181,621	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
37	Govsmart, Inc. Top agencies SBA (Small Business Administration) Commerce (Department of Commerce) NASA (National Aeronautics and Space Administration)	$5,024,634	0.5%	Rank history: #63 in FY2022, #63 in FY2023, #89 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
38	Computer World Services, Corp. Top agencies Treasury (Department of the Treasury) DHS (Department of Homeland Security)	$4,683,786	0.5%	Rank history: #48 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
39	Validatek-Citi, LLC Top agencies DHS (Department of Homeland Security)	$4,437,377	0.5%	Rank history: #50 in FY2022, #56 in FY2023, #59 in FY2024 and #92 in FY2025; new, not ranked in FY2020.
40	NA Alii Consulting & Sales LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DISA (Defense Information Systems Agency)	$4,406,787	0.5%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
41	Reveal Global Consulting LLC Top agencies Commerce (Department of Commerce)	$4,397,000	0.5%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
42	A1M Solutions, Inc. Top agencies HHS (Department of Health and Human Services)	$4,274,421	0.4%	Rank history: #69 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
43	Carahsoft Technology Corp Top agencies Commerce (Department of Commerce) USAF (Department of the Air Force) DOI (Department of the Interior)	$4,236,876	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	New TECH Solutions, Inc. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) DOJ (Department of Justice)	$4,003,819	0.4%	Rank history: not on the FY2022–FY2023 lists, #66 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
45	Unisys Corporation Top agencies DHS (Department of Homeland Security)	$4,000,824	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	Lumen Technologies Government Solutions, Inc. Top agencies VA (Department of Veterans Affairs)	$4,000,000	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	Technology, Automation & Management, Inc. Top agencies DMEA (Defense Microelectronics Activity)	$3,989,313	0.4%	Rank history: #55 in FY2022, not on the FY2023 list, #58 in FY2024 and #51 in FY2025; new, not ranked in FY2020.
48	Siemens Aktiengesellschaft Through Siemens Government Technologies Inc. Top agencies Navy (Department of the Navy)	$3,860,325	0.4%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
49	B 3 Group, LLC Top agencies VA (Department of Veterans Affairs)	$3,775,392	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Chags Health Information Technology, LLC Top agencies HHS (Department of Health and Human Services)	$3,671,235	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	Tiber Creek Consulting Inc. Top agencies Army (Department of the Army)	$3,642,402	0.4%	Rank history: #62 in FY2022, #76 in FY2023, #78 in FY2024 and #67 in FY2025; new, not ranked in FY2020.
52	Zeva Incorporated Top agencies DHS (Department of Homeland Security)	$3,442,354	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Dell Federal Systems L.P. Top agencies Commerce (Department of Commerce)	$3,231,914	0.3%	Rank history: #91 in FY2022, #28 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
54	Koniag, Inc. Through Eagle Harbor Solutions LLC Top agencies DOJ (Department of Justice) DHA (Defense Health Agency) Army (Department of the Army)	$3,204,844	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Excella, LLC Top agencies DHS (Department of Homeland Security)	$3,149,140	0.3%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
56	Fcn, Inc. Top agencies DISA (Defense Information Systems Agency) Commerce (Department of Commerce) Navy (Department of the Navy)	$3,109,147	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Feditc, LLC Top agencies Army (Department of the Army) USSOCOM (United States Special Operations Command)	$3,097,331	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	Agile Defense, LLC Top agencies Army (Department of the Army)	$3,057,347	0.3%	Rank history: #51 in FY2022, #84 in FY2023, not on the FY2024 list and #41 in FY2025; new, not ranked in FY2020.
59	Northrop Grumman Corporation 3 awardees, including Northrop Grumman Systems Corporation Top agencies HUD (Department of Housing and Urban Development) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$2,932,489	0.3%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
60	The Chenega Corporation Through Chenega Agile Real-Time Solutions LLC Top agencies USAF (Department of the Air Force)	$2,875,686	0.3%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
61	The Gemini 3 Group, Inc. Top agencies Navy (Department of the Navy)	$2,770,219	0.3%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
62	Stratos Government Services, Inc. Through Inmarsat Government, Inc. Top agencies DHS (Department of Homeland Security)	$2,749,045	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	World Services LLC Top agencies OPM (Office of Personnel Management)	$2,699,685	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Datacard Corporation Through Entrust, Inc. Top agencies GSA (General Services Administration)	$2,670,000	0.3%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
65	Valkyrie Enterprises, LLC Top agencies USAF (Department of the Air Force)	$2,500,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	International Business Machines Corporation Top agencies Navy (Department of the Navy) Commerce (Department of Commerce)	$2,490,293	0.3%	Rank history: #70 in FY2022, #72 in FY2023, #71 in FY2024 and #50 in FY2025; new, not ranked in FY2020.
67	Environmental Systems Research Institute, Inc. Top agencies Commerce (Department of Commerce) DHS (Department of Homeland Security)	$2,315,965	0.2%	Rank history: #96 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
68	Coforma LLC Top agencies OPM (Office of Personnel Management)	$2,174,915	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Tacg, LLC Top agencies USAF (Department of the Air Force)	$2,154,474	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Mettle Solutions LLC Top agencies HHS (Department of Health and Human Services)	$1,978,341	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	VET Advisor LLC Through Three Wire Systems, LLC Top agencies VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$1,957,631	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Perspecta Inc. Through Peraton Technology Services Inc. Top agencies DISA (Defense Information Systems Agency)	$1,955,990	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Minburn Technology Group, LLC Top agencies VA (Department of Veterans Affairs)	$1,950,029	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Soft TECH Consulting, Inc. Top agencies DHS (Department of Homeland Security)	$1,880,296	0.2%	Rank history: not on the FY2022 list, #31 in FY2023, #31 in FY2024 and #39 in FY2025; new, not ranked in FY2020.
75	Zartek Solutions LLC Top agencies Treasury (Department of the Treasury)	$1,833,220	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Mythics, LLC Through Emergent, LLC Top agencies Commerce (Department of Commerce) USITC (International Trade Commission)	$1,827,867	0.2%	Rank history: #25 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
77	Prometheus Computing, LLC Top agencies Commerce (Department of Commerce)	$1,731,330	0.2%	Rank history: #73 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
78	T-Mobile US Inc. 2 awardees, including Sprint Communications Co LP and T-Mobile Usa, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DOJ (Department of Justice)	$1,679,696	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	DLT Solutions LLC Top agencies Commerce (Department of Commerce) Navy (Department of the Navy)	$1,659,315	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Dakota Consulting Incorporated Top agencies Commerce (Department of Commerce)	$1,613,209	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Logc2 Inc. Top agencies DLA (Defense Logistics Agency)	$1,561,936	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Kci-Acuity, LLC Top agencies HHS (Department of Health and Human Services)	$1,497,040	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Health Care Service Corporation, A Mutual Legal Reserve Company Through Availity, L.L.C. Top agencies VA (Department of Veterans Affairs)	$1,411,054	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Infapro Corporation Top agencies DHS (Department of Homeland Security)	$1,410,236	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	PBG Consulting, LLC Top agencies USDA (Department of Agriculture)	$1,393,717	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Electrosoft Services, LLC Top agencies DLA (Defense Logistics Agency)	$1,381,162	0.1%	Rank history: #54 in FY2022, #30 in FY2023, #29 in FY2024 and #21 in FY2025; new, not ranked in FY2020.
87	Attainx Inc. Top agencies USDA (Department of Agriculture)	$1,365,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Dynamic Systems Inc. Top agencies Commerce (Department of Commerce) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$1,330,599	0.1%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
89	I B Logistics LLC Top agencies USAF (Department of the Air Force)	$1,325,603	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Kizano Corp. Top agencies HUD (Department of Housing and Urban Development)	$1,316,992	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Nana Regional Corporation Inc 2 awardees, including Rivertech LLC and Affigent, LLC Top agencies DHS (Department of Homeland Security) Commerce (Department of Commerce) Army (Department of the Army)	$1,316,895	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Ipkeys Technologies LLC Top agencies DLA (Defense Logistics Agency)	$1,303,202	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	TM3 Solutions, Inc. Top agencies USDA (Department of Agriculture)	$1,258,388	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Omni Fed LLC Top agencies USAF (Department of the Air Force)	$1,253,269	0.1%	Rank history: #68 in FY2022, #47 in FY2023, #49 in FY2024 and #15 in FY2025; new, not ranked in FY2020.
95	Full Spectrum Operations LLC Top agencies USAF (Department of the Air Force)	$1,253,269	0.1%	Rank history: not on the FY2022–FY2024 lists and #59 in FY2025; new, not ranked in FY2020.
96	Sterling Computers Corporation Top agencies Commerce (Department of Commerce) DOL (Department of Labor) HHS (Department of Health and Human Services)	$1,243,674	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Nolij Consulting LLC Top agencies HHS (Department of Health and Human Services)	$1,240,372	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Allstream Business US LLC Through Zayo Group LLC Top agencies HHS (Department of Health and Human Services)	$1,217,430	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Emprise Corporation Top agencies Commerce (Department of Commerce)	$1,129,860	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Phoenix Oversight Group LLC Top agencies USDA (Department of Agriculture)	$1,115,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 460 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 $953 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 DD01 contractors in FY2021?

1. At&T Inc. ($143M), 2. Leonardo S.p.A. ($110M), 3. General Dynamics Corporation ($78.3M), 4. Four Points Technology, L.L.C. ($22.5M), 5. Deloitte LLP ($22.1M), 6. Change Healthcare Technologies LLC ($19.8M), 7. HP Enterprise Services LLC ($19.5M), 8. Qbase, LLC ($17.7M), 9. Creative It Solutions LLC ($16.8M), 10. Leidos Holdings, Inc. ($16.5M).

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