Top 100 Contractors in NAICS 5171: Wired and Wireless Telecommunications (except Satellite), FY2021

Name: Top 100 Contractors in NAICS 5171: Wired and Wireless Telecommunications (except Satellite), FY2021
Creator: GovTribe

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

The top 10 won 52% of FY2021 NAICS 5171 contract dollars

Contract obligations: $2,465,997,164 Net of deobligations, by contracts coded NAICS 5171 or a code under it
Contractors: 200 Parent companies with an obligation
Largest contractor: At&T Inc. $584 million, 18.5% 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. 22 awardees, including At&T Enterprises, LLC, At&T Technical Services Company, Inc. and Tyto Government Solutions Inc. Top agencies VA (Department of Veterans Affairs) Treasury (Department of the Treasury) DHS (Department of Homeland Security)	$584,313,539	18.5%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; up 1 since FY2020.
2	Lumen Technologies, Inc. 21 awardees, including Lumen Technologies Government Solutions, Inc., Level 3 Communications, LLC and Centurylink Communications, LLC Top agencies VA (Department of Veterans Affairs) DISA (Defense Information Systems Agency) DOI (Department of the Interior)	$232,212,286	7.4%	Rank history: #3 in FY2022, #3 in FY2023, #3 in FY2024 and #17 in FY2025; up 1 since FY2020.
3	CACI International Inc. 3 awardees, including Caci Nss, LLC and LGS Innovations LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$168,285,047	5.3%	Rank history: #4 in FY2022, #4 in FY2023, #34 in FY2024 and #4 in FY2025; up 3 since FY2020.
4	Verizon Communications Inc. 14 awardees, including Verizon Business Network Services LLC, Verizon Federal Inc. and Verizon Maryland LLC Top agencies Treasury (Department of the Treasury) HHS (Department of Health and Human Services) SSA (Social Security Administration)	$152,726,813	4.8%	Rank history: #2 in FY2022, #2 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
5	Telos Corporation Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$107,013,309	3.4%	Rank history: #9 in FY2022, #17 in FY2023, #40 in FY2024 and #35 in FY2025; up 7 since FY2020.
6	General Dynamics Corporation 3 awardees, including General Dynamics Information Technology, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$105,475,404	3.3%	Rank history: #8 in FY2022, #21 in FY2023, not on the FY2024 list and #6 in FY2025; up 2 since FY2020.
7	SMS Data Products Group Inc. Top agencies USAF (Department of the Air Force)	$95,954,410	3.0%	Rank history: #5 in FY2022, #6 in FY2023, #7 in FY2024 and #28 in FY2025; up 2 since FY2020.
8	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies USAF (Department of the Air Force) NSA (Department of Defense National Security Agency) Navy (Department of the Navy)	$80,254,955	2.5%	Rank history: #6 in FY2022, #5 in FY2023, #4 in FY2024 and #15 in FY2025; up 6 since FY2020.
9	Abacus Technology Corporation Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$60,106,965	1.9%	Rank history: #12 in FY2022, #8 in FY2023, #9 in FY2024 and #27 in FY2025; up 13 since FY2020.
10	Perspecta Inc. Through Peraton Enterprise Solutions LLC Top agencies USAF (Department of the Air Force) ED (Department of Education) Army (Department of the Army)	$59,566,232	1.9%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
11	CDO Technologies Inc. Top agencies USAF (Department of the Air Force)	$50,096,661	1.6%	Rank history: #23 in FY2022, #25 in FY2023, #46 in FY2024 and not on the FY2025 list; up 8 since FY2020.
12	American Systems Corporation Top agencies USAF (Department of the Air Force) GSA (General Services Administration) DHS (Department of Homeland Security)	$48,123,039	1.5%	Rank history: #25 in FY2022, #14 in FY2023, #17 in FY2024 and #89 in FY2025; down 1 since FY2020.
13	Sumaria Systems, LLC Top agencies USAF (Department of the Air Force)	$38,229,601	1.2%	Rank history: #28 in FY2022, #26 in FY2023, #44 in FY2024 and #97 in FY2025; up 8 since FY2020.
14	At&T Enterprises, LLC 2 awardees Top agencies Treasury (Department of the Treasury) HUD (Department of Housing and Urban Development) VA (Department of Veterans Affairs)	$37,952,615	1.2%	Rank history: #47 in FY2022, not on the FY2023 list, #10 in FY2024 and #14 in FY2025; down 7 since FY2020.
15	Valdez International Corporation Top agencies USAF (Department of the Air Force)	$37,605,721	1.2%	Rank history: #22 in FY2022, #12 in FY2023, #16 in FY2024 and not on the FY2025 list; up 5 since FY2020.
16	Technica Corporation Top agencies USAF (Department of the Air Force)	$36,529,326	1.2%	Rank history: #16 in FY2022, #13 in FY2023, #38 in FY2024 and not on the FY2025 list; up 1 since FY2020.
17	Granite Telecommunications, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DHA (Defense Health Agency)	$34,620,618	1.1%	Rank history: #20 in FY2022, #27 in FY2023, #21 in FY2024 and #19 in FY2025; up 30 since FY2020.
18	LGS Innovations LLC Top agencies Army (Department of the Army)	$34,599,156	1.1%	Rank history: #33 in FY2022, not on the FY2023 list, #50 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
19	Manhattan Telecommunications Corporation LLC Top agencies SSA (Social Security Administration) Navy (Department of the Navy) USDA (Department of Agriculture)	$33,447,113	1.1%	Rank history: #13 in FY2022, #7 in FY2023, #6 in FY2024 and #8 in FY2025; up 17 since FY2020.
20	Arlington Capital Partners IV, L.P. 3 awardees, including Tyto Athene, LLC, Tyto Government Solutions Inc. and Mutual Telecom Services Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$32,706,942	1.0%	Rank history: #18 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
21	Avaya Federal Solutions Inc. 2 awardees Top agencies SSA (Social Security Administration) Army (Department of the Army)	$28,535,335	0.9%	Rank history: #10 in FY2022, #10 in FY2023, #14 in FY2024 and #11 in FY2025; up 4 since FY2020.
22	Leidos Holdings, Inc. 5 awardees, including Leidos, Inc. Top agencies DISA (Defense Information Systems Agency) Army (Department of the Army) Navy (Department of the Navy)	$26,603,923	0.8%	Rank history: #15 in FY2022 and not on the FY2023–FY2025 lists; down 18 since FY2020.
23	Verizon Business Network Services LLC Top agencies DISA (Defense Information Systems Agency) DOL (Department of Labor) Commerce (Department of Commerce)	$25,473,728	0.8%	Rank history: not on the FY2022–FY2025 lists; up 61 since FY2020.
24	Microtechnologies LLC 2 awardees, including Defined Technologies, LLC Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) DISA (Defense Information Systems Agency)	$23,630,582	0.7%	Rank history: #11 in FY2022, #11 in FY2023, #39 in FY2024 and not on the FY2025 list; down 9 since FY2020.
25	T-Mobile US Inc. Through T-Mobile Secure Federal Operations LLC Top agencies DISA (Defense Information Systems Agency)	$22,179,320	0.7%	Rank history: #32 in FY2022, #33 in FY2023, #18 in FY2024 and not on the FY2025 list; up 48 since FY2020.
26	Core Technologies, LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$21,044,435	0.7%	Rank history: #14 in FY2022, #23 in FY2023, #24 in FY2024 and not on the FY2025 list; up 36 since FY2020.
27	BT North America Inc. 2 awardees, including 22Nd Century Networks, Inc. and British Telecommunications Public Limited Company Top agencies Army (Department of the Army) Navy (Department of the Navy) NMB (National Mediation Board)	$21,026,864	0.7%	Rank history: #37 in FY2022, #54 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
28	Northrop Grumman Corporation 2 awardees, including Northrop Grumman Systems Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$20,223,722	0.6%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; up 3 since FY2020.
29	EPS Corporation Top agencies USAF (Department of the Air Force) SSA (Social Security Administration) DHS (Department of Homeland Security)	$20,200,837	0.6%	Rank history: #35 in FY2022, #39 in FY2023, #58 in FY2024 and #45 in FY2025; down 11 since FY2020.
30	HP Enterprise Services LLC 4 awardees, including Peraton Enterprise Solutions LLC, Peraton Government Communications Inc. and Peraton Inc. Top agencies ED (Department of Education) DISA (Defense Information Systems Agency) Army (Department of the Army)	$20,105,897	0.6%	Rank history: #21 in FY2022, #9 in FY2023, #25 in FY2024 and not on the FY2025 list; up 30 since FY2020.
31	Valkyrie Enterprises, LLC 2 awardees Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$18,545,258	0.6%	Rank history: #30 in FY2022, #16 in FY2023, #41 in FY2024 and not on the FY2025 list; down 4 since FY2020.
32	Bristol Bay Native Corporation Through Gc&E Systems Group, LLC Top agencies Army (Department of the Army)	$15,718,232	0.5%	Rank history: #27 in FY2022, #15 in FY2023, #22 in FY2024 and not on the FY2025 list; up 19 since FY2020.
33	Amentum Services, Inc. Top agencies Army (Department of the Army) DISA (Defense Information Systems Agency)	$14,622,171	0.5%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
34	Smartronix LLC 2 awardees Top agencies USAF (Department of the Air Force)	$12,871,531	0.4%	Rank history: #53 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
35	Global Telecom & Technology Inc. 3 awardees, including GTT Americas, LLC and GTT Global Telecom Government Services, LLC Top agencies DISA (Defense Information Systems Agency) USAF (Department of the Air Force) DHA (Defense Health Agency)	$12,209,625	0.4%	Rank history: #24 in FY2022, #34 in FY2023, #28 in FY2024 and not on the FY2025 list; down 11 since FY2020.
36	Intelligent Decisions LLC Through Applied Insight, LLC Top agencies USAF (Department of the Air Force)	$12,132,483	0.4%	Rank history: #44 in FY2022, #44 in FY2023, #55 in FY2024 and not on the FY2025 list; up 17 since FY2020.
37	A & T Systems, Inc. Top agencies Army (Department of the Army) Commerce (Department of Commerce)	$11,054,076	0.4%	Rank history: #38 in FY2022, #24 in FY2023, #35 in FY2024 and not on the FY2025 list; up 4 since FY2020.
38	Gstek, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$9,411,301	0.3%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
39	The Centech Group Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$8,972,514	0.3%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
40	Lumen Technologies Government Solutions, Inc. 2 awardees Top agencies VA (Department of Veterans Affairs) FEC (Federal Election Commission) USITC (International Trade Commission)	$7,473,706	0.2%	Rank history: #7 in FY2022, #41 in FY2023, #5 in FY2024 and #3 in FY2025; down 12 since FY2020.
41	Futron, Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior) DLA (Defense Logistics Agency)	$6,476,129	0.2%	Rank history: #39 in FY2022, #37 in FY2023, #45 in FY2024 and #47 in FY2025; up 27 since FY2020.
42	International Business Machines Corporation 2 awardees Top agencies Army (Department of the Army)	$6,414,024	0.2%	Rank history: not on the FY2022–FY2025 lists; down 29 since FY2020.
43	Dinocrates Group LLC Through Global Management Systems, Inc. Top agencies Army (Department of the Army)	$5,670,196	0.2%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; up 31 since FY2020.
44	Leader Communications Inc. Top agencies Army (Department of the Army)	$5,119,245	0.2%	Rank history: #29 in FY2022, #20 in FY2023, #20 in FY2024 and #62 in FY2025; up 76 since FY2020.
45	Btas Inc. Top agencies USAF (Department of the Air Force)	$3,796,962	0.1%	Rank history: #45 in FY2022, #49 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
46	STG Group, Inc. Through STG LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$3,619,994	0.1%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
47	Cordev Corporation Top agencies Army (Department of the Army)	$3,585,268	0.1%	Rank history: #57 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
48	By Light Professional It Services LLC Top agencies DISA (Defense Information Systems Agency) Army (Department of the Army)	$3,173,459	0.1%	Rank history: #48 in FY2022, #40 in FY2023, #63 in FY2024 and #46 in FY2025; up 4 since FY2020.
49	Vision Technologies Inc. 2 awardees Top agencies SEC (Securities and Exchange Commission) NARA (National Archives and Records Administration)	$3,060,917	0.1%	Rank history: #52 in FY2022, #19 in FY2023, #96 in FY2024 and not on the FY2025 list; up 18 since FY2020.
50	Ooredoo Q.S.C Through Ooredoo Q.p.s.c Top agencies DISA (Defense Information Systems Agency)	$2,900,965	0.1%	Rank history: not on the FY2022–FY2025 lists; up 40 since FY2020.
51	Allstream Business US LLC 3 awardees, including Zayo Group LLC, 360 Networks (USA) Inc. and Electric Lightwave LLC Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) Smithsonian (Smithsonian Institution)	$2,838,532	0.1%	Rank history: #41 in FY2022, #35 in FY2023, #56 in FY2024 and not on the FY2025 list; up 86 since FY2020.
52	Gc&E Systems Group, LLC Top agencies Army (Department of the Army)	$2,641,457	0.1%	Rank history: not on the FY2022–FY2023 lists, #53 in FY2024 and #44 in FY2025; down 19 since FY2020.
53	Tyto Athene, LLC 2 awardees, including Tyto Government Solutions Inc. Top agencies USAF (Department of the Air Force)	$2,602,955	0.1%	Rank history: #36 in FY2022, #46 in FY2023, #64 in FY2024 and #81 in FY2025; up 8 since FY2020.
54	RTX Corporation Through Raytheon Company Top agencies USAF (Department of the Air Force)	$2,602,056	0.1%	Rank history: #49 in FY2022, #42 in FY2023, #67 in FY2024 and #90 in FY2025; up 70 since FY2020.
55	Vector Resources Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior) DHS (Department of Homeland Security)	$2,561,511	0.1%	Rank history: #51 in FY2022 and not on the FY2023–FY2025 lists; up 22 since FY2020.
56	ACS Messaging, Inc. Top agencies GSA (General Services Administration)	$2,500,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Strategic Resources, Incorporated Top agencies Army (Department of the Army)	$2,253,002	0.1%	Rank history: #43 in FY2022, #28 in FY2023, #33 in FY2024 and #69 in FY2025; down 14 since FY2020.
58	Cavalier Telephone L.L.C. 5 awardees, including Windstream Communications, LLC and Paetec Communications, LLC Top agencies DISA (Defense Information Systems Agency) DHA (Defense Health Agency) Navy (Department of the Navy)	$2,178,968	0.1%	Rank history: #62 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
59	Applied Insight, LLC Top agencies USAF (Department of the Air Force)	$2,080,578	0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; up 10 since FY2020.
60	Sos International LLC Top agencies Army (Department of the Army)	$1,700,849	0.1%	Rank history: #42 in FY2022, #45 in FY2023, #47 in FY2024 and #68 in FY2025; new, not ranked in FY2020.
61	At&T Technical Services Company, Inc. Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$1,573,256	<0.1%	Rank history: not on the FY2022–FY2023 lists, #8 in FY2024 and #9 in FY2025; down 2 since FY2020.
62	Ka'ala Systems Technology Corporation Top agencies USAF (Department of the Air Force)	$1,450,148	<0.1%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; up 30 since FY2020.
63	MCI Communications Services LLC Top agencies DOI (Department of the Interior) Navy (Department of the Navy) DODEA (Department of Defense Education Activity)	$1,413,007	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 23 since FY2020.
64	Netcom Technologies Inc. Top agencies DOJ (Department of Justice)	$1,396,331	<0.1%	Rank history: #60 in FY2022, not on the FY2023–FY2024 lists and #100 in FY2025; new, not ranked in FY2020.
65	Kddi Corporation Top agencies Navy (Department of the Navy)	$1,300,129	<0.1%	Rank history: #55 in FY2022, #65 in FY2023, #82 in FY2024 and #61 in FY2025; up 22 since FY2020.
66	Cox Enterprises, Inc. 11 awardees, including Cox California Telcom, LLC, Cox Virginia Telcom, L.l.c and Cox Florida Telcom LP Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force) DISA (Defense Information Systems Agency)	$1,268,308	<0.1%	Rank history: #67 in FY2022, #58 in FY2023, #88 in FY2024 and not on the FY2025 list; up 23 since FY2020.
67	Bahrain Telecommunications Co Mpany (Batelco) Top agencies Navy (Department of the Navy) DISA (Defense Information Systems Agency)	$1,092,430	<0.1%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
68	National Capitol Contracting LLC 13 awardees, including Comcast Business Communications, LLC, Comcast of Carolina, LLC and Comcast of Virginia, LLC Top agencies DOE (Department of Energy) NRC (Nuclear Regulatory Commission) VA (Department of Veterans Affairs)	$1,074,791	<0.1%	Rank history: #50 in FY2022, #36 in FY2023, #76 in FY2024 and not on the FY2025 list; up 28 since FY2020.
69	Leidos, Inc. Top agencies Army (Department of the Army)	$1,006,882	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
70	Time Warner Cable Enterprises LLC 7 awardees, including Charter Communications Operating, LLC and Time Warner Cable Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) VA (Department of Veterans Affairs)	$951,141	<0.1%	Rank history: #79 in FY2022, #55 in FY2023, #65 in FY2024 and not on the FY2025 list; up 25 since FY2020.
71	Global Management Systems, Inc. Top agencies Army (Department of the Army)	$928,579	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
72	American Operations Corporation Through AOC Connect, LLC Top agencies DISA (Defense Information Systems Agency)	$768,611	<0.1%	Rank history: #40 in FY2022, #52 in FY2023, #100 in FY2024 and not on the FY2025 list; up 42 since FY2020.
73	Mainstream IP Solutions, Inc. Top agencies USAF (Department of the Air Force)	$715,356	<0.1%	Rank history: #61 in FY2022, #91 in FY2023, #90 in FY2024 and #72 in FY2025; up 15 since FY2020.
74	Chugach Alaska Corporation Through Chugach Information Technology LLC Top agencies Navy (Department of the Navy)	$569,428	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 31 since FY2020.
75	Southern Light LLC Top agencies DISA (Defense Information Systems Agency)	$534,510	<0.1%	Rank history: #66 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; up 90 since FY2020.
76	Level 3 Telecom Holdings, LLC Top agencies DOS (Department of State)	$532,457	<0.1%	Rank history: not on the FY2022 list, #48 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
77	Ukpeagvik Inupiat Corpor Through Bowhead Operations & Maintenance Solutions LLC Top agencies USAF (Department of the Air Force)	$376,476	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
78	Deutsche Telekom Business Solutions GMBH Through T-Systems International GMBH Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army) DHA (Defense Health Agency)	$366,917	<0.1%	Rank history: #58 in FY2022, not on the FY2023–FY2024 lists and #26 in FY2025; up 23 since FY2020.
79	Zayo Group LLC Top agencies DOI (Department of the Interior)	$360,000	<0.1%	Rank history: not on the FY2022–FY2023 lists, #62 in FY2024 and not on the FY2025 list; down 13 since FY2020.
80	Pacific Northwest Gigapop Top agencies Commerce (Department of Commerce)	$343,397	<0.1%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; up 27 since FY2020.
81	The Texas Lone Star Network, L.L.C. Top agencies DISA (Defense Information Systems Agency)	$342,340	<0.1%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
82	Artel LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$337,483	<0.1%	Rank history: #34 in FY2022, #77 in FY2023, #13 in FY2024 and not on the FY2025 list; down 32 since FY2020.
83	Clarity Communications Group LLC Top agencies DISA (Defense Information Systems Agency) Navy (Department of the Navy)	$327,018	<0.1%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; up 58 since FY2020.
84	Al Pacific Limited Est. for Electrical Contracting Top agencies Army (Department of the Army)	$294,773	<0.1%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 43 since FY2020.
85	GTT Americas, LLC Top agencies DISA (Defense Information Systems Agency)	$287,407	<0.1%	Rank history: #65 in FY2022, not on the FY2023 list, #91 in FY2024 and not on the FY2025 list; down 36 since FY2020.
86	South Dakota Network, LLC Top agencies DISA (Defense Information Systems Agency)	$211,560	<0.1%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; up 70 since FY2020.
87	Telecom Italia SPA 2 awardees Top agencies DISA (Defense Information Systems Agency) DHA (Defense Health Agency) USAF (Department of the Air Force)	$207,201	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.
88	Worldnet Telecommunications LLC Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy)	$198,874	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 70 since FY2020.
89	R. S. Means Company LLC Through The Gordian Group, Inc. Top agencies Army (Department of the Army)	$196,107	<0.1%	Rank history: #69 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
90	University of Hawaii Systems Through University of Hawaii Top agencies Commerce (Department of Commerce)	$183,878	<0.1%	Rank history: #77 in FY2022, #90 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
91	The Chenega Corporation Through Chenega Logistics, LLC Top agencies Navy (Department of the Navy)	$142,323	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 52 since FY2020.
92	Communication Technologies, Inc. Top agencies DHA (Defense Health Agency) DISA (Defense Information Systems Agency) DMA (Defense Media Activity)	$128,274	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 111 since FY2020.
93	Telefonica, SA Through Telefonica De Espana Sau Top agencies DISA (Defense Information Systems Agency) Navy (Department of the Navy)	$122,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
94	MDU Enterprises Inc Through Allbridge LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) DOI (Department of the Interior)	$101,328	<0.1%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; up 54 since FY2020.
95	Xtera Inc. Top agencies DISA (Defense Information Systems Agency)	$92,643	<0.1%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
96	Arvig Enterprises Inc. Through East Otter Tail Telephone Company Top agencies HHS (Department of Health and Human Services)	$89,177	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	RCN Telecom Services, LLC Top agencies National Gallery of Art DOJ (Department of Justice)	$89,086	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 60 since FY2020.
98	Peraton Government Communications Inc. Top agencies Navy (Department of the Navy)	$81,767	<0.1%	Rank history: not on the FY2022–FY2023 lists, #68 in FY2024 and #31 in FY2025; new, not ranked in FY2020.
99	Caci-Iss, LLC Top agencies Army (Department of the Army)	$77,265	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 33 since FY2020.
100	Spectrum Partners LLC Top agencies DISA (Defense Information Systems Agency)	$76,438	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 200 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 5171

Code	Net obligations	Largest contractor
51711 Wired and Wireless Telecommunications Carriers (except Satellite)	$2,465,997,164	At&T Inc.
517110 Wired Telecommunications Carriers	$2,465,997,164	At&T Inc.

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 $3.15 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 5171 contractors in FY2021?

1. At&T Inc. ($584M), 2. Lumen Technologies, Inc. ($232M), 3. CACI International Inc. ($168M), 4. Verizon Communications Inc. ($153M), 5. Telos Corporation ($107M), 6. General Dynamics Corporation ($105M), 7. SMS Data Products Group Inc. ($96M), 8. Booz Allen Hamilton Holding Corporation ($80.3M), 9. Abacus Technology Corporation ($60.1M), 10. Perspecta Inc. ($59.6M).

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