Company lists · Data refreshed September 2026

Top 25 Lower middle market investment firms based in San Francisco, United States

Name: Lower middle market investment firms based in San Francisco, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 125 companies tracked

RevenueBase identified 125 lower middle market investment firms headquartered in San Francisco, United States as of September 2026 and tracks 5,274 professional contacts across them, including 2,864 with verified work emails. Across the United States, New York is the largest hub for this category (855 companies); San Francisco has 125.

This list covers lower middle market investment firms headquartered in San Francisco, 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

125Companies

5,274Contacts tracked

2,864Verified emails

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The 25 largest lower middle market investment firms based in San Francisco, United States

Ranked by team size

Top 25 of 125 lower middle market investment firms based in San Francisco, United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to lower middle market investment firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	TPG	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,979 contacts →
	Partial evidence “TPG (Nasdaq: TPG) is a leading global alternative asset management firm, founded in San Francisco in 1992, with $306 billion of assets under management and investment and…” Source: RevenueBase Database · checked Sep 28, 2026
2	Sixth Street	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	802 contacts →
	Partial evidence “Sixth Street is a global investment firm with over $135 billion in assets under management and committed capital.* The firm uses its long-term flexible capital, data-enabled…” Source: RevenueBase Database · checked Sep 28, 2026
3	Hellman & Friedman	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	220 contacts →
	Partial evidence “Founded in 1984, Hellman & Friedman (H&F) is one of the most experienced private equity investment firms operating today.” Source: RevenueBase Database · checked Sep 28, 2026
4	Gryphon Investors	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	211 contacts →
	Strong evidence “Gryphon Investors is a leading middle-market private investment firm focused on building and growing profitable, market-leading companies in the Business Services, Consumer…” Source: RevenueBase Database · checked Sep 28, 2026
5	FTV Capital	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	135 contacts →
	Partial evidence “FTV Capital is a growth equity investment firm that has raised over $10.2 billion to invest in high-growth companies offering a range of innovative solutions in financial…” Source: RevenueBase Database · checked Sep 28, 2026
6	Golden Gate Capital	Partial evidence	San Francisco, United StatesHQ checked Sep 28, 2026	51-200	126 contacts →
	Partial evidence “Golden Gate Capital is a San Francisco-based private equity investment firm with approximately $20 billion in cumulative committed capital.” Source: RevenueBase Database · checked Sep 28, 2026
7	US Capital	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	112 contacts →
	Strong evidence “Founded in 1998, US Capital Global offers a range of advanced financial solutions, including debt, equity, and investment products customized for middle-market enterprises and…” Source: RevenueBase Database · checked Sep 28, 2026
8	Turn River Capital	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	106 contacts →
	Indirect evidence “Turn/River Capital is a private equity firm that applies a proprietary growth engineering strategy to investing, partnering with software businesses to accelerate growth and build…” Source: RevenueBase Database · checked Sep 28, 2026
9	JH Partners	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	96 contacts →
	Partial evidence “JH Partners, LLC ("JH Partners" or "JHP") is a San Francisco-based private equity firm focused on building sustainable, long-term equity value in consumer and marketing-driven…” Source: RevenueBase Database · checked Sep 28, 2026
10	Vector Capital Management	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	89 contacts →
	Partial evidence “Vector Capital is a leading, San Francisco-based global private equity and credit investment firm focused on transformative investments in technology and technology-enabled…” Source: RevenueBase Database · checked Sep 28, 2026
11	Dragoneer Investment Group	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	85 contacts →
	Partial evidence “Dragoneer is a growth-oriented investment firm with over $35 billion in assets under management.” Source: RevenueBase Database · checked Sep 28, 2026
12	Genstar Capital	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	84 contacts →
	Strong evidence “Genstar Capital is a leading middle-market private equity firm, investing in high quality companies for over 30 years.” Source: RevenueBase Database · checked Sep 28, 2026
13	White OAK Global Advisors	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	201-500	84 contacts →
	Strong evidence “White Oak Global Advisors, LLC is a leading alternative debt manager specializing in originating and providing financing solutions to support small and middle market enterprises.” Source: RevenueBase Database · checked Sep 28, 2026
14	Atel Capital Group	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	56 contacts →
	Indirect evidence “For half a century, ATEL Capital Group has financed the companies transforming our economy-deploying capital to more than businesses globally.” Source: RevenueBase Database · checked Sep 28, 2026
15	Meritage Group LP	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	47 contacts →
	Partial evidence “Meritage Group LP is a fundamentally oriented investment firm backed by evergreen, flexible capital.” Source: RevenueBase Database · checked Sep 28, 2026
16	Pinegrove Venture Partners	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	47 contacts →
	Partial evidence “Pinegrove is a venture investment platform designed to deliver tailored solutions for fund managers, founders, and limited partners in the venture capital ecosystem.” Source: RevenueBase Database · checked Sep 28, 2026
17	Banneker Partners	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	44 contacts →
	Indirect evidence “Founded in 2016, Banneker is dedicated to empowering management teams on their journey to build exceptional software companies.” Source: RevenueBase Database · checked Sep 28, 2026
18	Main Post Partners	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	33 contacts →
	Partial evidence “Main Post Partners is a private equity investment firm focused on investing $50 – $250+ million in high-growth companies across the consumer value chain.” Source: RevenueBase Database · checked Sep 28, 2026
19	Calera Capital	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	33 contacts →
	Strong evidence “Founded in 1991, Calera Capital has invested over $5 billion of equity capital in the middle market, predominantly in founder, family, and management-owned businesses across a…” Source: RevenueBase Database · checked Sep 28, 2026
20	Tree Line Capital Partners	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	32 contacts →
	Strong evidence “Tree Line Capital Partners is a private credit asset management firm focused on direct lending to the lower middle-market.” Source: RevenueBase Database · checked Sep 28, 2026
21	True Wind	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	32 contacts →
	Partial evidence “True Wind is an investment firm that helps technology businesses transform industries.” Source: RevenueBase Database · checked Sep 28, 2026
22	Industrial Growth Partners	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	30 contacts →
	Strong evidence “IGP is a San Francisco-based specialist private investment partnership focused exclusively on acquiring middle-market industrial businesses.” Source: RevenueBase Database · checked Sep 28, 2026
23	BAY Grove	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	29 contacts →
	Indirect evidence “Bay Grove was formed in late 2007 by Kevin Marchetti and Adam Forste and joined in 2011 by Dave Brandes.” Source: RevenueBase Database · checked Sep 28, 2026
24	Knox Lane	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	28 contacts →
	Strong evidence “Knox Lane is a San Francisco-based middle-market investment firm, comprised of investors and operators from blue-chip backgrounds that have a long history of working together…” Source: RevenueBase Database · checked Sep 28, 2026
25	Headlands Capital	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	11-50	28 contacts →
	Partial evidence “Headlands Capital is a boutique investment firm with more than $750 million in AUM, headquartered in San Francisco, with offices in New York, London and Bangalore.” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: lower middle market investment firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names lower middle market investment firms.
Partial evidence: Its own public description names part of lower middle market investment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name lower middle market investment firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 125 lower middle market investment firms based in San Francisco, United States

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Lower middle market investment firms based in San Francisco, United States at a glance

As of Sep 28, 2026

54.3%Verified-email coverage

42.2Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for San Francisco, so it is reported there. Company counts and contact totals on this page are exact for San Francisco, over 125 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 lower middle market investment firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search 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 Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in San Francisco, United States whose own description of what they do matches “lower middle market investment firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names lower middle market investment firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among lower middle market investment firms, and records with no verified work email. Companies headquartered outside San Francisco 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 its RevenueBase Smart Search 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, 2,864 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 28, 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.

Lower middle market investment firms by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names lower middle market investment firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many lower middle market investment firms are there based in San Francisco, United States?

RevenueBase identified 125 lower middle market investment firms headquartered in San Francisco, 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?

TPG, headquartered in San Francisco, tops this list with the largest team on record.

Which city in the United States has the most lower middle market investment firms?

New York leads the United States with 855 headquartered companies, followed by Chicago (276) and Dallas (204). San Francisco has 125.

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 2,864 verified decision-maker contacts tracked across these 125 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 28, 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 Smart Search, 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.