Top 100 Contractors in PSC DH: IT and Telecom – Platform, FY2021

Name: Top 100 Contractors in PSC DH: IT and Telecom – Platform, FY2021
Creator: GovTribe

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

The top 10 won 46% of FY2021 PSC DH contract dollars

Contract obligations: $422,335,117 Net of deobligations, by contracts coded PSC DH or a code under it
Contractors: 387 Parent companies with an obligation
Largest contractor: I3 Federal LLC $48.8 million, 11.1% 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	I3 Federal LLC Top agencies HHS (Department of Health and Human Services)	$48,801,769	11.1%	Rank history: #5 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
2	Northrop Grumman Corporation 2 awardees, including Northrop Grumman Systems Corporation Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$33,892,422	7.7%	Rank history: #4 in FY2022, #12 in FY2023, #15 in FY2024 and #7 in FY2025; new, not ranked in FY2020.
3	Hawaiian Native Corporation Through Aktarius LLC Top agencies Army (Department of the Army)	$22,681,879	5.2%	Rank history: #9 in FY2022, #8 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
4	Sabel Systems Technology Solutions, LLC Top agencies USAF (Department of the Air Force)	$18,651,454	4.3%	Rank history: #10 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
5	Science Applications International Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army) USDA (Department of Agriculture)	$18,368,118	4.2%	Rank history: #2 in FY2022, #20 in FY2023, #21 in FY2024 and #20 in FY2025; new, not ranked in FY2020.
6	Ironclad Technology Services LLC Top agencies DHS (Department of Homeland Security)	$14,302,132	3.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
7	Teletracking Government Services Inc. Top agencies HHS (Department of Health and Human Services)	$13,000,000	3.0%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
8	HP Enterprise Services LLC Through Peraton Enterprise Solutions LLC Top agencies DFAS (Defense Finance and Accounting Service) DHS (Department of Homeland Security)	$10,982,817	2.5%	Rank history: #21 in FY2022, #6 in FY2023, #29 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
9	Microhealth LLC Top agencies DHA (Defense Health Agency) DHS (Department of Homeland Security)	$9,765,958	2.2%	Rank history: #91 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
10	Bixal Solutions Incorporated Top agencies HHS (Department of Health and Human Services)	$9,160,304	2.1%	Rank history: #16 in FY2022, #23 in FY2023, #24 in FY2024 and #22 in FY2025; new, not ranked in FY2020.
11	Maximus Inc. Through Maximus Federal Services, Inc. Top agencies Treasury (Department of the Treasury)	$8,723,831	2.0%	Rank history: #6 in FY2022, #7 in FY2023, #66 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
12	General Dynamics Corporation Through General Dynamics Information Technology Inc. Top agencies CNCS (Corporation for National and Community Service)	$8,475,916	1.9%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
13	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies HHS (Department of Health and Human Services)	$7,879,220	1.8%	Rank history: #78 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
14	Spatial Front Inc. Top agencies Commerce (Department of Commerce)	$7,787,285	1.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
15	Acumen LLC Top agencies HHS (Department of Health and Human Services)	$7,300,450	1.7%	Rank history: #27 in FY2022, #28 in FY2023, #26 in FY2024 and #37 in FY2025; new, not ranked in FY2020.
16	Humanit Solutions LLC Top agencies HHS (Department of Health and Human Services)	$7,210,734	1.6%	Rank history: #15 in FY2022, #31 in FY2023, #91 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
17	Teamstaff Inc. Through Social & Scientific Systems, Inc. Top agencies HHS (Department of Health and Human Services)	$7,186,342	1.6%	Rank history: #22 in FY2022, #27 in FY2023, #35 in FY2024 and #28 in FY2025; new, not ranked in FY2020.
18	Lawelawe Technology Services, Inc. Top agencies Army (Department of the Army)	$6,970,911	1.6%	Rank history: #18 in FY2022, #21 in FY2023, #25 in FY2024 and #23 in FY2025; new, not ranked in FY2020.
19	Palantir USG Inc. Top agencies USAF (Department of the Air Force)	$6,000,000	1.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
20	Reed Elsevier Inc. 4 awardees, including Relx Inc., Lexisnexis Special Services Inc. and Elsevier B.V. Top agencies SSA (Social Security Administration) DOS (Department of State) HHS (Department of Health and Human Services)	$5,938,776	1.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
21	JSI Telecom Inc. Top agencies DOJ (Department of Justice)	$5,757,890	1.3%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
22	Accenture Federal Services LLC 2 awardees, including ASM Research, LLC Top agencies DHRA (Defense Human Resources Activity) USDA (Department of Agriculture)	$5,499,884	1.3%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
23	Seneca Holdings LLC Through Executive Protection Systems LLC Top agencies DOJ (Department of Justice)	$4,218,300	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
24	Arrow Alliance Industries, LLC Top agencies DOI (Department of the Interior)	$3,961,989	0.9%	Rank history: #24 in FY2022, #34 in FY2023, #68 in FY2024 and #38 in FY2025; new, not ranked in FY2020.
25	The Outfit Inc. Top agencies Army (Department of the Army)	$3,611,025	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
26	Advanced Technology Systems Inc. Through Guident Technologies, Inc. Top agencies DOT (Department of Transportation)	$3,437,272	0.8%	Rank history: #71 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
27	Sierra7, Inc. Top agencies VA (Department of Veterans Affairs)	$3,329,829	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Deloitte LLP Through Deloitte Consulting LLP Top agencies SSA (Social Security Administration)	$3,199,575	0.7%	Rank history: #14 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
29	Palantir Technologies Inc. Through Palantir USG Inc. Top agencies USAF (Department of the Air Force)	$3,000,000	0.7%	Rank history: #8 in FY2022, #4 in FY2023, #11 in FY2024 and #11 in FY2025; new, not ranked in FY2020.
30	Revolutional, LLC Top agencies USDA (Department of Agriculture)	$2,990,944	0.7%	Rank history: #47 in FY2022, not on the FY2023–FY2024 lists and #58 in FY2025; new, not ranked in FY2020.
31	Satsyil Corp Top agencies NARA (National Archives and Records Administration)	$2,982,790	0.7%	Rank history: #45 in FY2022, #36 in FY2023, #55 in FY2024 and #66 in FY2025; new, not ranked in FY2020.
32	Allogy LLC Top agencies DHA (Defense Health Agency)	$2,884,457	0.7%	Rank history: #49 in FY2022, not on the FY2023 list, #67 in FY2024 and #53 in FY2025; new, not ranked in FY2020.
33	Chickasaw Nation Through CNI Global Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$2,839,661	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Dnanexus, Inc. Top agencies HHS (Department of Health and Human Services)	$2,797,823	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Versatech Inc. Top agencies HHS (Department of Health and Human Services)	$2,654,474	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Executive Information Systems, L.L.C. Top agencies HHS (Department of Health and Human Services)	$2,649,609	0.6%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
37	T1 Construction LLC Top agencies USAF (Department of the Air Force)	$2,636,711	0.6%	Rank history: not on the FY2022 list, #82 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
38	New TECH Solutions, Inc. Top agencies SBA (Small Business Administration) USUHS (DOD Uniformed Services University of the Health Sciences) DISA (Defense Information Systems Agency)	$2,599,923	0.6%	Rank history: not on the FY2022 list, #98 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
39	Healthverity Inc. Top agencies HHS (Department of Health and Human Services)	$2,556,000	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	Nana Regional Corporation Inc 2 awardees, including Affigent, LLC and Tuva LLC Top agencies HHS (Department of Health and Human Services) DISA (Defense Information Systems Agency) Treasury (Department of the Treasury)	$2,540,332	0.6%	Rank history: #55 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
41	Regenstrief Institute Inc. Top agencies HHS (Department of Health and Human Services)	$2,368,493	0.5%	Rank history: #33 in FY2022, #67 in FY2023, #59 in FY2024 and #32 in FY2025; new, not ranked in FY2020.
42	Nexgen Technologies Inc. Top agencies DOI (Department of the Interior)	$2,343,384	0.5%	Rank history: #59 in FY2022, #60 in FY2023, #62 in FY2024 and #72 in FY2025; new, not ranked in FY2020.
43	Alaska Native Government Services LLC Through Copper River Information Technology, LLC Top agencies HHS (Department of Health and Human Services)	$2,291,773	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies DHA (Defense Health Agency) Navy (Department of the Navy)	$2,115,793	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
45	International Business Machines Corporation Top agencies USDA (Department of Agriculture) RRB (Railroad Retirement Board) Army (Department of the Army)	$2,103,066	0.5%	Rank history: #44 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; new, not ranked in FY2020.
46	Sohum Systems LLC Top agencies DOT (Department of Transportation)	$2,070,317	0.5%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
47	Digital Science & Research Solutions Inc. Top agencies Navy (Department of the Navy)	$1,997,647	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
48	Four Points Technology, L.L.C. Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration)	$1,984,356	0.5%	Rank history: #1 in FY2022, #3 in FY2023, #5 in FY2024 and #61 in FY2025; new, not ranked in FY2020.
49	Computer World Services, Corp. Top agencies HHS (Department of Health and Human Services)	$1,885,317	0.4%	Rank history: #70 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
50	The Boeing Company Top agencies DCMA (Defense Contract Management Agency)	$1,668,989	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
51	Perspecta Inc. Through Peraton Enterprise Solutions LLC Top agencies DFAS (Defense Finance and Accounting Service)	$1,550,633	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
52	The Informatics Applications Group, Inc. Top agencies Army (Department of the Army)	$1,432,774	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	D7, LLC Top agencies USAF (Department of the Air Force)	$1,377,417	0.3%	Rank history: #66 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
54	Riva Solutions Inc. Top agencies USDA (Department of Agriculture)	$1,347,168	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Braingu LLC Top agencies USAF (Department of the Air Force)	$1,286,000	0.3%	Rank history: #42 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
56	Bam Technologies LLC Top agencies USAF (Department of the Air Force)	$1,257,024	0.3%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
57	Systems Integration & Development Inc. Top agencies DOL (Department of Labor)	$1,189,290	0.3%	Rank history: not on the FY2022 list, #78 in FY2023, #93 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
58	Reli Group Inc. Top agencies DHS (Department of Homeland Security)	$1,113,968	0.3%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
59	The Chenega Corporation Through Chenega Healthcare Services LLC Top agencies NRC (Nuclear Regulatory Commission)	$1,082,705	0.2%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
60	Koniag, Inc. Through Arlluk Technology Solutions LLC Top agencies HHS (Department of Health and Human Services)	$1,071,922	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Concurrent Real-Time Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,026,493	0.2%	Rank history: not on the FY2022 list, #86 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
62	Carahsoft Technology Corp Top agencies DOL (Department of Labor) USAF (Department of the Air Force) Peace Corps	$1,024,226	0.2%	Rank history: #3 in FY2022, #2 in FY2023, #2 in FY2024 and #4 in FY2025; new, not ranked in FY2020.
63	Creative Systems and Consulting L.L.C. Top agencies USDA (Department of Agriculture)	$1,005,504	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	RTX Corporation Through Nightwing Technologies, LLC Top agencies USAF (Department of the Air Force)	$1,000,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Label Insight, Inc. Top agencies HHS (Department of Health and Human Services)	$999,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Rainbow Data Systems, Inc. Top agencies DCMA (Defense Contract Management Agency)	$944,768	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	Alexander & Tom, Inc. Top agencies Treasury (Department of the Treasury)	$931,560	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Pen-Link, Ltd Top agencies DOJ (Department of Justice)	$902,613	0.2%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
69	CA Inc. Top agencies SSA (Social Security Administration)	$880,807	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Communications Training Analysis Corporation Top agencies CPSC (Consumer Product Safety Commission)	$870,122	0.2%	Rank history: #97 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
71	Accelus LLC Top agencies Army (Department of the Army)	$840,924	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Dell Federal Systems L.P. 2 awardees, including Dell Marketing L.P. Top agencies HHS (Department of Health and Human Services) Smithsonian (Smithsonian Institution) Navy (Department of the Navy)	$834,967	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	V3Gate, LLC Top agencies DOJ (Department of Justice)	$823,544	0.2%	Rank history: not on the FY2022 list, #73 in FY2023, #64 in FY2024 and #13 in FY2025; new, not ranked in FY2020.
74	Tsymmetry Inc. Top agencies DHS (Department of Homeland Security)	$754,699	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Gartner, Inc. Top agencies DOE (Department of Energy) NTSB (National Transportation Safety Board) DHS (Department of Homeland Security)	$739,447	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Insight Public Sector Inc. 2 awardees Top agencies OPM (Office of Personnel Management) EXIM (Export Import Bank of the US) EPA (Environmental Protection Agency)	$729,591	0.2%	Rank history: not on the FY2022 list, #55 in FY2023, #61 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
77	Costar Group, Inc. Through Costar Realty Information, Inc. Top agencies HUD (Department of Housing and Urban Development) GSA (General Services Administration) Commerce (Department of Commerce)	$699,134	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Presidio Government Solutions LLC Top agencies DOJ (Department of Justice)	$654,653	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	Dynamic Systems Inc. Top agencies DISA (Defense Information Systems Agency) DOJ (Department of Justice) MSPB (Merit Systems Protection Board)	$643,238	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Trillion Technology Solutions Inc. Top agencies Commerce (Department of Commerce)	$607,195	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Clinicomp International Inc. Top agencies VA (Department of Veterans Affairs)	$604,944	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Softek Enterprises LLC Top agencies DOL (Department of Labor)	$596,023	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	3RD Eye Technologies LLC Top agencies DOJ (Department of Justice)	$590,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Situation Awareness Systems LLC Top agencies DOI (Department of the Interior)	$547,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	President and Fellows of Harvard College Through Harvard Business School Publishing Corporation Top agencies OSD (Office of the Secretary of Defense)	$527,008	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Oil Price Information Service LLC Through IHS Global Inc. Top agencies DOT (Department of Transportation) SSA (Social Security Administration) DOE (Department of Energy)	$511,409	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Definitive Logic Corporation Top agencies DOL (Department of Labor)	$504,531	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Appddictionstudio Limited Liability Company Top agencies USAF (Department of the Air Force)	$503,277	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Dologic Inc. Top agencies USDA (Department of Agriculture)	$496,705	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	DLT Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$494,802	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Ebsco Industries Inc. 3 awardees Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army) USITC (International Trade Commission)	$490,696	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Vae, Inc. Top agencies DISA (Defense Information Systems Agency)	$475,721	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Advanced Computer Concepts, Inc. Top agencies DISA (Defense Information Systems Agency)	$474,412	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	CDW Corporation Through CDW Government LLC Top agencies USUHS (DOD Uniformed Services University of the Health Sciences) DOJ (Department of Justice)	$473,926	0.1%	Rank history: #89 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
95	R. S. Means Company LLC 2 awardees, including The Gordian Group, Inc. and Accruent LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$469,514	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Yudrio Inc. Top agencies Treasury (Department of the Treasury)	$451,950	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Sirius Computer Solutions, LLC 2 awardees, including Sirius Federal LLC Top agencies DOI (Department of the Interior) DOJ (Department of Justice)	$425,960	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Brittingham Software Design Inc. Top agencies USAF (Department of the Air Force)	$425,030	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Virtuvia LLC Top agencies Army (Department of the Army)	$401,500	0.1%	Rank history: not on the FY2022–FY2023 lists, #96 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
100	Technology Trends Group, LLC Top agencies HHS (Department of Health and Human Services)	$400,104	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 387 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC DH

Code	Net obligations	Largest contractor
DH01 IT and Telecom – Platform Support Services: Database, Mainframe, Middleware (Labor)	$280,858,460	Northrop Grumman Corporation
DH10 IT and Telecom – Platform as a Service: Database, Mainframe, Middleware	$141,476,657	I3 Federal LLC

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 $438 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 DH contractors in FY2021?

1. I3 Federal LLC ($48.8M), 2. Northrop Grumman Corporation ($33.9M), 3. Hawaiian Native Corporation ($22.7M), 4. Sabel Systems Technology Solutions, LLC ($18.7M), 5. Science Applications International Corporation ($18.4M), 6. Ironclad Technology Services LLC ($14.3M), 7. Teletracking Government Services Inc. ($13M), 8. HP Enterprise Services LLC ($11M), 9. Microhealth LLC ($9.77M), 10. Bixal Solutions Incorporated ($9.16M).

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