Company lists · Data refreshed September 2026

Top 25 Middle market private equity companies based in San Diego, United States

Name: Middle market private equity companies based in San Diego, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 48 companies tracked

RevenueBase identified 48 middle market private equity companies headquartered in San Diego, United States as of September 2026 and tracks 320 professional contacts across them, including 147 with verified work emails. New York is the largest hub.

This list covers middle market private equity companies headquartered in San Diego, 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

48Companies

320Contacts tracked

147Verified emails

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The 25 largest middle market private equity companies based in San Diego, United States

Ranked by team size

Top 25 of 48 middle market private equity companies based in San Diego, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names middle market private equity 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	Neos PartnersStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	11-50	64
	“Neos Partners is a middle-market investment firm focused on second-order investing in the energy transition and critical infrastructure sectors.” Source: company website · checked Sep 5, 2026
2	Seaside Equity PartnersStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	11-50	28
	“Based in San Diego, Seaside Equity Partners is a growth-oriented and operationally focused private equity firm that seeks to provide capital, resources and strategic support to…” Source: company website · checked Sep 5, 2026
3	Interwest CapitalPartial evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	11-50	19
	“Interwest Capital is a privately-held firm founded in early 2003 by executives with diversified backgrounds and extensive knowledge in the real estate and financial industries.” Source: company website · checked Sep 5, 2026
4	Allied HOA PartnersIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	15
	“Welcome to Allied HOA Partners.” Source: company website · checked Sep 5, 2026
5	Castle Creek CapitalIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	11-50	14
	“Castle Creek is an alternative asset management firm focused on the community banking industry.” Source: company website · checked Sep 5, 2026
6	Cypress Ascendant Holdings, LLCPartial evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	14
	“Cypress Ascendant is a highly diversified, small market, boutique investment group.” Source: company website · checked Sep 5, 2026
7	Accord Asset PartnersStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	11-50	13
	“Accord is a San Diego, CA based private equity firm focused on partnering with management teams and founders to seek to create value and transformative growth.” Source: company website · checked Sep 5, 2026
8	Shoreline Partners, LLCStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	13
	“Shoreline Partners is a Mergers and Acquisitions Advisory firm serving private owners of lower middle market businesses.” Source: company website · checked Sep 5, 2026
9	Gateway Partners, INCStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	11-50	9
	“Gateway Partners, Inc.("GPI") is a specialized buy-side mergers and acquisitions firm serving the middle market.” Source: company website · checked Sep 5, 2026
10	LLJ Ventures, LLCIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	7
	“LLJ VENTURES, LLC is a company based out of 401 B ST STE 920, SAN DIEGO, California, United States.” Source: company website · checked Sep 5, 2026
11	TVC CapitalPartial evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	7
	“TVC Capital is an operator-led growth equity firm focused on investments in and acquisitions of software companies.” Source: company website · checked Sep 5, 2026
12	Verde Equity PartnersStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	5
	“Verde Equity Partners is a private equity firm specializing in control buyouts of lower middle-market businesses and property services investments in the Western U.S.” Source: company website · checked Sep 5, 2026
13	Persient LLCIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	5
	“At Persient, M&A is our singular focus.” Source: company website · checked Sep 5, 2026
14	CapitalsphereStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	11-50	5
	“CapitalSphere helps middle market business owners meet private equity investors with the right resources to help their companies grow.” Source: company website · checked Sep 5, 2026
15	Sunset Coast PartnersStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	4
	“Sunset Coast Partners is an independent sponsor firm focused on acquisitions in the lower middle market.” Source: company website · checked Sep 5, 2026
16	Validex Global InvestingIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	4
	“We invest at the inflection point of accelerating growth, at every stage of a company's evolution.” Source: company website · checked Sep 5, 2026
17	Valuestreet Equity PartnersStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	2
	“ValueStreet is a private equity firm investing in quality small businesses, generating between $500k-$2M in annual cash flow, with the potential to grow indefinitely in the future.” Source: company website · checked Sep 5, 2026
18	Carib VenturesIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	2
	“CaribVentures is a family owned investment and operating fund committed to building exceptional companies primarily in the SaaS, artificial intelligence, digital media and B2B…” Source: company website · checked Sep 5, 2026
19	Cloudbreak CapitalStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	11-50	1
	“Cloudbreak Capital is a global private equity firm, serving clients in several areas including technology, real estate, energy, healthcare, business services, manufacturing…” Source: company website · checked Sep 5, 2026
20	Binary-HelixStrong evidence	San Diego, United StatesHQ checked Sep 5, 2026	1-10	1
	“Binary-Helix is a leading global investment firm specializing in creating long-term value for our clients via an array of alternative asset classes in private equity, real estate…” Source: company website · checked Sep 5, 2026
21	Circle Square CapitalIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	1
	“Founders of companies don’t fit into perfect circles or squares.” Source: company website · checked Sep 5, 2026
22	Zeal PartnersIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	1
	“Zeal Partners was founded to acquire and grow a single, high quality company.” Source: company website · checked Sep 5, 2026
23	Arrow UP Partners, LLCStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	1
	“Arrow Up Partners to was established to address the growing number of baby boomers who are interested in selling their middle market business and looking for high multiples upon…” Source: company website · checked Sep 5, 2026
24	Fidalgo PartnersIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	1
	“Named after the picturesque Fidalgo Island, where our family journey began, we are a husband-and-wife team who embarked on the entrepreneurial path together.” Source: company website · checked Sep 5, 2026
25	Morpho Capital PartnersStrong evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	1-10	1
	“Morpho Capital is a private equity investments firm focused on supporting scalable and sustainable businesses in the lower middle-market that have a proven businesses model and…” Source: company website · checked Sep 5, 2026

Showing 25 of 48 middle market private equity companies based in San Diego, United States

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Middle market private equity companies based in San Diego, United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

New YorkLargest hub · 911 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

11-50

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 San Diego, over 48 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 middle market private equity 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 San Diego, United States whose own description of what they do matches “middle market private equity 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 middle market private equity companies, and records with no verified work email. Companies headquartered outside San Diego 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, 147 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.

Middle market private equity companies by metro in the United States

Frequently asked

How many middle market private equity companies are there based in San Diego, United States?

RevenueBase identified 48 middle market private equity companies headquartered in San Diego, 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?

Neos Partners, headquartered in San Diego, tops this list with the largest team on record.

Which city has the most middle market private equity companies?

New York leads with 911 headquartered companies, followed by Chicago (317) and Dallas (276).

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 147 verified decision-maker contacts tracked across these 48 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.