Top 40 IT companies in Seattle
The 40 most prominent IT companies with a head office in Seattle, ranked by team size, money raised and how many of their people we hold. Every head office is checked against two sources, Crunchbase and the company’s own LinkedIn page, and a company is left out when they disagree.
- Head office: Seattle, WA
- Crunchbase category: Information Technology
- Verified IT companies
- 290
- People working there now
- 15,015
- Data read
The 40 most prominent
40 of 290 · ranked by team size, funding and reach| # | Company | Head office | Team size | Founded | Last round | Profiles we hold |
|---|---|---|---|---|---|---|
| 1 |  Porch Groupporchgroup.com |
Seattle, WA | 1,078 | 2013 | Public | 1,142 |
| 2 |  Aegisaegisgrp.com |
Seattle, WA | 3,199 | 1995 | — | 2,114 |
| 3 |  QA Wolfqawolf.com |
Seattle, WA | 204 | 2019 | Series B | 302 |
| 4 |  Tangotangocard.com |
Seattle, WA | 149 | 2009 | Private equity | 231 |
| 5 |  Chronuschronus.com |
Seattle, WA | 127 | 2007 | Debt | 212 |
| 6 |  Eigen Labseigenlabs.org |
Seattle, WA | 75 | 2021 | Undisclosed | 190 |
| 7 |  SecureW2securew2.com |
Seattle, WA | 138 | 2014 | Private equity | 162 |
| 8 |  Ooklaookla.com |
Seattle, WA | 604 | 2006 | — | 603 |
| 9 |  Leapfrog Technologylftechnology.com |
Seattle, WA | 560 | 2010 | — | 623 |
| 10 |  Yoodliyoodli.ai |
Seattle, WA | 135 | 2021 | Series B | 165 |
| 11 |  Phaidraphaidra.ai |
Seattle, WA | 98 | 2019 | Series B | 123 |
| 12 |  Valantvalant.io |
Seattle, WA | 137 | 2005 | Private equity | 168 |
| 13 |  Ever.greenever.green |
Seattle, WA | 159 | 2021 | Seed | 167 |
| 14 |  Wimmer Solutionswimmersolutions.com |
Seattle, WA | 290 | 2002 | — | 356 |
| 15 |  Concord Technologiesconcord.net |
Seattle, WA | 282 | 2000 | Private equity | 330 |
| 16 |  Milliman MedInsightmedinsight.milliman.com |
Seattle, WA | 287 | 1997 | — | 357 |
| 17 |  Logic20/20logic2020.com |
Seattle, WA | 219 | 2005 | — | 293 |
| 18 |  Inspectifyinspectify.com |
Seattle, WA | 79 | 2019 | Venture round | 100 |
| 19 |  Upleveluplevelteam.com |
Seattle, WA | 65 | 2018 | Series A | 85 |
| 20 | Klirklir.com | Seattle, WA | 87 | 2017 | Series A | 111 |
| 21 |  JeffreyM Consultingjeffreym.com |
Seattle, WA | 163 | 2006 | — | 273 |
| 22 |  Sila Solutions Groupsilasg.com |
Seattle, WA | 193 | 2002 | — | 173 |
| 23 |  Reverba Globalreverba.com |
Seattle, WA | 163 | 2002 | — | 216 |
| 24 |  DomainToolsDomainTools.com |
Seattle, WA | 148 | 2004 | — | 197 |
| 25 |  Integrateintegrate.co |
Seattle, WA | 48 | 2022 | Debt | 64 |
| 26 |  Teleionteleion.com |
Seattle, WA | 143 | 2008 | — | 198 |
| 27 |  H10 Capitalh10capital.com |
Seattle, WA | 134 | 2009 | — | 180 |
| 28 |  IOActiveioactive.com |
Seattle, WA | 135 | 1998 | — | 181 |
| 29 |  Opanga Networksopanga.com |
Seattle, WA | 49 | 2005 | Venture round | 57 |
| 30 |  Digital Fortress Data Centers and Colocationdigital-fortress.com |
Seattle, WA | 59 | 2003 | Private equity | 73 |
| 31 |  DataSunrisedatasunrise.com |
Seattle, WA | 128 | 2015 | — | 133 |
| 32 |  CopilotKitcopilotkit.ai |
Seattle, WA | 45 | 2023 | Series A | 53 |
| 33 |  Rylem Staffingrylem.com |
Seattle, WA | 99 | 2007 | — | 161 |
| 34 |  Preludepreludesecurity.com |
Seattle, WA | 28 | 2020 | Venture round | 57 |
| 35 |  Factalfactal.com |
Seattle, WA | 59 | 2018 | Venture round | 63 |
| 36 |  Outbound AIoutbound.ai |
Seattle, WA | 34 | 2021 | Seed | 50 |
| 37 |  NPF Consultingnpfconsulting.com |
Seattle, WA | 105 | 2000 | — | 107 |
| 38 |  Kaitokaito.ai |
Seattle, WA | 43 | 2022 | Venture round | 58 |
| 39 |  Pendulumpendulumintel.com |
Seattle, WA | 49 | 2021 | Seed | 70 |
| 40 | Shiftboardshiftboard.com | Seattle, WA | 31 | 2008 | Debt | 62 |
Whitepages
Abett
Archbright250 more verified IT companies in Seattle are in Generect, with the 15,015 people who work at them: names, roles and verified work emails.
Open the full list in Generect Book a demoFree trial, no credit card. Seattle and IT arrive as filters, ready to narrow by role and seniority.
How this list is built
Two sources must agree
Crunchbase files 1,325 IT companies under a Seattle head office. We match each one to its LinkedIn page by domain and keep it only if LinkedIn does not contradict the city or the country: 74 were left out because LinkedIn puts the head office in another city, 16 because it names another country, 8 because the names do not match.
Ranked by substance
The order combines team size on LinkedIn, money raised and how many of the company’s people we hold. It is not a popularity score, and nobody pays to be listed. 378 companies with fewer than five people were left out, and so were 2 that now belong to an acquirer, so one employer is not counted twice.
Every number has a date
Each company’s LinkedIn page was read within the last 180 days; 68 with an older read were left out rather than shown with stale numbers. This page was built from data read on .
Questions about IT companies in Seattle
What are the largest IT companies in Seattle?
Of the companies on this list, the largest by team size on LinkedIn are Aegis (3,199), Porch Group (1,078), Ookla (604), Leapfrog Technology (560) and Wimmer Solutions (290). Among those founded in the last ten years, the largest are QA Wolf, Ever.green, Yoodli, Phaidra and Klir.
What are the top IT startups in Seattle?
Among companies on this list founded in 2020 or later, the largest by team size on LinkedIn are Ever.green (159), Yoodli (135), Eigen Labs (75), Pendulum (49), Integrate (48) and CopilotKit (45).
Which IT companies are headquartered in Seattle?
The most prominent are Porch Group, Aegis, QA Wolf, Tango, Chronus, Eigen Labs, SecureW2, Ookla, Leapfrog Technology and Yoodli. This page lists the top 40; Crunchbase files 1,325 IT companies with a Seattle head office, and 290 of them pass our checks.
How many IT companies are there in Seattle?
Crunchbase files 1,325 companies with a Seattle head office under its Information Technology category. 290 of them pass our checks: a LinkedIn page that agrees on the city and the country, at least five people, and a company profile read in the last 180 days.
Which Seattle IT companies in this list are the newest?
By founding year: CopilotKit (2023), Integrate (2022), Kaito (2022), Eigen Labs (2021), Yoodli (2021) and Ever.green (2021).
How is this list ranked?
By a combined score of team size on LinkedIn, total money raised and how many of the company's people we hold. Every list in the directory uses this order. It is not a popularity vote and nobody pays to be on it.
How do I find contacts at these companies?
Generect holds 15,015 people working at these 290 companies now. Open the list in Generect to filter them by role, seniority and location and to get verified work emails. This page publishes company data only, no personal contact details.
When was this list last updated?
It was built from data read on 21 Oct 2026. The date at the top of the page changes every time the list is rebuilt.