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26 October 20266 min read

AI Investors in Seattle (2026): Who Is Backing Early-Stage Startups

The firms backing early-stage AI startups across Seattle and King County in 2026, what they invest, and the deals behind each one.

Investors backing early-stage AI startups in Seattle in 2026 include Madrona, FUSE, Flying Fish Partners, AI House, Ascend, Founders' Co-op and Trilogy Equity Partners, from pre-seed to Series A.

Researched and written by Zeeshan Ali at Platvix. Checked on 24 October 2026.

TL;DR

  • Who writes the first cheque in Seattle? Ascend invests at pre-seed from $250,000 to $750,000, and AI House from $100,000 to $1m.
  • Who leads a round here? Madrona, FUSE, Flying Fish Partners, AI House and Trilogy Equity Partners have each led or co-led a King County AI round in the past two years, and Founders' Co-op led an AI pre-seed in July 2026.
  • Is there an AI-only investor in the city? Flying Fish Partners invests in AI and machine learning companies, and AI House backs applied AI founders.

Early-stage AI investors in Seattle

Madrona

A Seattle firm that invests from incubation and seed through Series A, with applied AI running through its current funds.

FUSE

A Bellevue firm that backs Pacific Northwest software and AI-enabled companies from day one onwards.

Flying Fish Partners

A Seattle firm that invests in artificial intelligence and machine learning companies.

AI House

A Seattle incubator and pre-seed fund for applied AI founders, which round announcements through mid-2026 still name as AI2 Incubator.

Ascend

A Seattle pre-seed firm that aims to write the first cheque into a company.

Founders' Co-op

A Seattle firm that backs technical teams before there is a product or any revenue.

Trilogy Equity Partners

A Bellevue firm, run by former operators, that concentrates on seed rounds close to home.

Also worth knowing

Pioneer Square Labs runs a startup studio in Seattle together with PSL Ventures, which invests in early-stage companies.

Other support in the region

The CoMotion Innovation Gap Fund gives University of Washington teams grants of up to $75,000 from an annual pool of more than $1m, and it is funded by CoMotion, the Washington Research Foundation, the Population Health Initiative and donors. Applications are usually due in the first week of September and the last week of February, and the Fall 2026 cycle has closed.

FAQ

Which Seattle investors back AI and nothing else?

Flying Fish Partners invests in AI and machine learning companies at pre-seed and seed, and AI House offers pre-seed capital for applied AI founders. Madrona, FUSE, Ascend, Founders' Co-op and Trilogy all invest widely, with a lot of AI in recent rounds.

I am spinning a company out of the University of Washington. Where do I start?

CoMotion handles UW-assigned intellectual property and runs the Innovation Gap Fund for teams that are still pre-company. On the investment side, Pack Ventures backs campus teams and alumni, and it was in Accipiter Biosciences' seed round.

How were these investors chosen?

Each one has a dated investment in King County in the last 24 months, invests at pre-seed, seed or Series A, has made a new investment since April 2025 and either states an AI focus or has done an AI deal in the last 24 months. This guide uses King County, so Bellevue, Kirkland and Redmond count as Seattle while Tacoma and Everett do not, and there are more qualifying firms here than a guide can carry, so the final seven are a judgement about what is useful to an early-stage founder.

How do I find which Seattle investors fit my startup?

Platvix is an investment intelligence platform for founders. It helps you through your fundraising journey, from analysing your pitch deck to finding the right capital for your startup, including VC firms, angels, accelerators and grants.

Where to go from here

Find the Seattle investors most likely to back you

Start with the funds that have already written cheques into King County AI companies at your stage.

Start your investor research →

Tags

  • Investors
  • AI Startups
  • US Fundraising
  • Pre-seed
  • venture-capital

About the author

Zeeshan Ali, Co-Founder

Co-founder at Platvix, building an investment intelligence platform and the ecosystem around it so founders become investment-ready faster and VCs make stronger decisions. I focus on operations, partnerships, and community building, turning strategy into execution through programmes, processes, and founder support.