Company lists · Data refreshed September 2026

Top 23 Private equity portfolio companies based in Seattle, United States

RevenueBase identified 42 private equity portfolio companies headquartered in Seattle, United States as of September 2026 and tracks 169 professional contacts across them, including 78 with verified work emails. New York is the largest hub.

This list covers private equity portfolio 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
42Companies
169Contacts tracked
78Verified emails
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The 23 largest private equity portfolio companies based in Seattle, United States

Ranked by team size
Top 23 of 42 private equity portfolio 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 private equity portfolio 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.
#CompanyHeadquartersEmployeesContacts
1
Rainier PartnersStrong evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5029

“Rainier Partners is a private equity firm rooted in the Pacific Northwest that invests in businesses in the lower middle market, primarily in the Western US and Canada.”

Source: company website · checked Sep 5, 2026
2
Pike Street CapitalStrong evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-1012

“Based in Seattle, Pike Street Capital is a private equity firm focused on lower middle market growth buyouts.”

Source: company website · checked Sep 5, 2026
3
Manzanita CapitalIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 202611-5012

“Manzanita Capital invests in entrepreneurs and emerging brands who are poised to enter new markets.”

Source: company website · checked Sep 5, 2026
4
Columbia River PartnersStrong evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-108

“Columbia River Partners (CRP) is a private investment firm integrating private equity, venture capital and special situations.”

Source: company website · checked Sep 5, 2026
5Seattle, WA, United StatesHQ checked Sep 5, 20261-108

“Archon Capital Management LLC ("Archon") was established in 2004 by Constantinos Christofilis as a privately held investment firm.”

Source: company website · checked Sep 5, 2026
6
Techstrat LTDIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-105

“At TechStrat we help entrepreneurs, CEOs and shareholders grow and fund technology businesses.”

Source: company website · checked Sep 5, 2026
7
Zenith Growth PartnersIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-105

“Zenith Growth Partners was established to find, acquire, and grow an outstanding business for the long term.”

Source: company website · checked Sep 5, 2026
8
Montlake CapitalStrong evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-105

“Montlake Capital is a Pacific Northwest-based private equity firm with extensive investing and operating experience.”

Source: company website · checked Sep 5, 2026
9
Skylight CapitalIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-105

“Based in Seattle, Washington, Skylight Capital was formed to invest in or acquire companies in the Western U.S.”

Source: company website · checked Sep 5, 2026
10
Frontbridge CapitalPartial evidence
Seattle, United StatesHQ checked Sep 5, 20261-104

“Frontbridge Capital (“FBC”) is a private investment and advisory firm serving growth-stage companies in the innovation economy, primarily in the technology, media, and…”

Source: company website · checked Sep 5, 2026
11
Westward PartnersPartial evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-104

“Westward Partners is a private investment firm focused on producing attractive long-term returns through alternative asset investments.”

Source: company website · checked Sep 5, 2026
12Seattle, WA, United StatesHQ checked Sep 5, 20261-103

“Ranch Creek Partners is a private equity investment firm focused principally on acquiring control equity positions in public and private companies in the middle market.”

Source: company website · checked Sep 5, 2026
13
Gaudium CapitalStrong evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-103

“Gaudium Capital was founded in 2018 with a focus on private equity in the technology sector.”

Source: company website · checked Sep 5, 2026
14Seattle, WA, United StatesHQ checked Sep 5, 20261-103

“Evergreen Pacific Partners is a $700 million private equity firm with a focus on investing in outstanding middle market businesses.”

Source: company website · checked Sep 5, 2026
15
DUE West PartnersPartial evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-102

“Due West Partners is a private investment firm focused on long-term value creation through much more than capital.”

Source: company website · checked Sep 5, 2026
16
Shipyard Cascade CapitalStrong evidence
Seattle, United StatesHQ checked Sep 5, 202611-502

“Shipyard Cascade Capital is a privately-held investment firm, managing a portfolio of direct investments as well as partnerships with many leading investment managers.”

Source: company website · checked Sep 5, 2026
17
CuriousIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-102

“Curious is a long term holding company and investment firm that buys and grows software companies with empathy.”

Source: company website · checked Sep 5, 2026
18
Dreamward GroupIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-102

“Investment firm”

Source: company website · checked Sep 5, 2026
19
Ackerley Partners LLCStrong evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-101

“Ackerley Partners LLC is a venture capital & private equity company based out of Seattle, Washington, United States.”

Source: company website · checked Sep 5, 2026
20
General PacificIndirect evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-101

“Long-term growth capital partner helping field-service operators scale”

Source: company website · checked Sep 5, 2026
21
Graham Street Capital, LLCIndirect evidence
Seattle, United StatesHQ checked Sep 5, 20261-101

“Graham Street Capital seeks to acquire and actively manage small to mid-sized businesses in the Pacific Northwest.”

Source: company website · checked Sep 5, 2026
22
Eschaton CapitalPartial evidence
Seattle, WA, United StatesHQ checked Sep 5, 20261-101

“Eschaton Capital is a private investment firm based in Seattle.”

Source: company website · checked Sep 5, 2026
23
KAM CapitalIndirect evidence
Seattle, United StatesHQ checked Sep 5, 20261-101

“We are looking to acquire accounting and bookkeeping firms in the US (Washington/Oregon) with revenue between $1.2M -$5M.”

Source: company website · checked Sep 5, 2026

Showing 23 of 42 private equity portfolio companies based in Seattle, United States

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Private equity portfolio companies based in Seattle, United States at a glance

As of Sep 5, 2026
1-10Median size (employees)
New YorkLargest hub · 913 HQs
Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
34
11-50
8

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 42 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 private equity portfolio 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 “private equity portfolio 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 private equity portfolio 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, 78 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.

Private equity portfolio companies by metro in the United States

Frequently asked

How many private equity portfolio companies are there based in Seattle, United States?

RevenueBase identified 42 private equity portfolio 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?

Rainier Partners, headquartered in Seattle, tops this list with the largest team on record.

Which city has the most private equity portfolio companies?

New York leads with 913 headquartered companies, followed by Chicago (289) and San Francisco (230).

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 78 verified decision-maker contacts tracked across these 42 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.