Company lists · Data refreshed September 2026

Top 25 Managed IT services companies based in Seattle, United States

Name: Managed IT services companies based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 61 companies tracked

RevenueBase identified 61 managed IT services companies headquartered in Seattle, United States as of September 2026 and tracks 423 professional contacts across them, including 165 with verified work emails. New York is the largest hub.

This list covers managed IT services companies headquartered in Seattle, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

61Companies

423Contacts tracked

165Verified emails

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The 25 largest managed IT services companies based in Seattle, United States

Ranked by team size

Top 25 of 61 managed IT services companies based in Seattle, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names managed IT services companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Seitel Systems, INCIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	45
	“We provide network, server, desktop, and cloud services that include system design, implementation, and support.” Source: company website · checked Sep 5, 2026
2	Greene ISIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	35
	“Full service Information Technology Consulting and Outsourcing for Your Business Greene IS specializes in providing comprehensive computer networking solutions to the small and…” Source: company website · checked Sep 5, 2026
3	Dynamic ComputingIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	24
	“Dynamic Computing helps companies and organizations in Seattle and across the Puget Sound region achieve their goals through technology.” Source: company website · checked Sep 5, 2026
4	Fusion TechnologiesStrong evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	23
	“Fusion Technologies is a growing IT consulting, managed service provider.” Source: company website · checked Sep 5, 2026
5	Sentry ComputingPartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	22
	“Sentry Computing builds smart IT solutions that keep your day-to-day operations running smoothly.” Source: company website · checked Sep 5, 2026
6	Swat SystemsIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	20
	“SWAT Systems is now Convergence Networks!” Source: company website · checked Sep 5, 2026
7	Olive GooseIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	16
	“Olive + Goose is an agile, quality-focused company, trusted by small and large businesses alike.” Source: company website · checked Sep 5, 2026
8	InterplayPartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	1-10	15
	“Interplay IT is a trusted, Seattle-based IT partner specializing in Architecture, Engineering, Construction, and Mission-Driven Nonprofits.” Source: company website · checked Sep 5, 2026
9	CG Tech ServicesIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	1-10	15
	“Need reliable tech solutions that help your business thrive?” Source: company website · checked Sep 5, 2026
10	DPE SystemsIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	12
	“DPE Systems, Inc.” Source: company website · checked Sep 5, 2026
11	Executech SeattleStrong evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	201-500	11
	“Executech is an award-winning, managed IT services provider.” Source: company website · checked Sep 5, 2026
12	Black Label ITIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	10
	“We help our clients unleash the power of their network and stop settling for substandard productivity.” Source: company website · checked Sep 5, 2026
13	Forge Technology AdvisorsPartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	7
	“Forge Technology Advisors provides a customized suite of IT and Telecommunications consulting services-including Cybersecurity, SASE, UCaaS, CCaaS, and Networking-tailored to meet…” Source: company website · checked Sep 5, 2026
14	Yavar IT Solutions And ServicesPartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	7
	“Yavar offers Information Technology (IT) services and support to small–medium sized businesses.” Source: company website · checked Sep 5, 2026
15	Logix ConsultingStrong evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	7
	“Our goal is to provide reliable managed IT services to keep your business networks and computers running smoothly at reasonable prices.” Source: company website · checked Sep 5, 2026
16	ZEN TechworksIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	1-10	6
	“Zen Techworks was founded with the goal to help businesses and individuals get the most out of their information technology.” Source: company website · checked Sep 5, 2026
17	Applied Technology ConsultingIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	1-10	6
	“Applied Technology Consulting is an information technology and services company based in Seattle, WA.” Source: company website · checked Sep 5, 2026
18	Digital Seattle, INCStrong evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	51-200	5
	“Intelligent Technical Solutions is your trusted business partner for all your Cybersecurity, Managed and Co-managed IT support, Risk & Compliance, Data Analytics, and Consulting…” Source: company website · checked Sep 5, 2026
19	VertiancePartial evidence	Seattle, United StatesHQ checked Sep 5, 2026	1-10	4
	“Trusted IT support, strategy, and cybersecurity for small businesses.” Source: company website · checked Sep 5, 2026
20	Right Brain Tech SupportIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	11-50	4
	“Right Brain Tech Support is a Seattle based company aiming to make your life, and job easier.” Source: company website · checked Sep 5, 2026
21	Salmon BAY TechnologyPartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	1-10	3
	“Salmon Bay Technology delivers simple, manageable and affordable information technology services designed to enhance the performance of small to medium sized businesses.” Source: company website · checked Sep 5, 2026
22	PC TherapistStrong evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	1-10	3
	“PC Therapist is your premiere computer and network specialist providing on-call network administration, managed IT services, and outsourced Chief Technology Officer / Chief…” Source: company website · checked Sep 5, 2026
23	Network Support GroupPartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	1-10	3
	“Network Support Group offers complete IT support, scalable to utilize our clients' in-house IT skills/knowledge.” Source: company website · checked Sep 5, 2026
24	Vcto SecureIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	1-10	3
	“VCTO Secure empowers clients by Making I.T.” Source: company website · checked Sep 5, 2026
25	Plantech Solutions, INCStrong evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	1-10	2
	“PlanTech Solutions is a Seattle based IT company that provides managed services for small to medium sized businesses.” Source: company website · checked Sep 5, 2026

Showing 25 of 61 managed IT services companies based in Seattle, United States

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Managed IT services companies based in Seattle, United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

New YorkLargest hub · 352 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 61 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among managed IT services companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Seattle, United States whose own description of what they do matches “managed IT services companies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among managed IT services companies, and records with no verified work email. Companies headquartered outside Seattle are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 165 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 5, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Managed IT services companies by metro in the United States

Frequently asked

How many managed IT services companies are there based in Seattle, United States?

RevenueBase identified 61 managed IT services companies headquartered in Seattle, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Seitel Systems, INC, headquartered in Seattle, tops this list with the largest team on record.

Which city has the most managed IT services companies?

New York leads with 352 headquartered companies, followed by Houston (242) and Chicago (153).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 165 verified decision-maker contacts tracked across these 61 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.