Company lists · Data refreshed September 2026

Top 25 Middle market private equity firms based in the United States

Name: Middle market private equity firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 6,444 companies tracked

RevenueBase identified 6,444 middle market private equity firms headquartered in the United States as of September 2026 and tracks 113,361 professional contacts across them, including 54,741 with verified work emails and 49,034 with mobile numbers. New York is the largest hub.

This list covers middle market private equity firms headquartered in the 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 5, 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 5, 2026 86% judged on-target in blind review

6,444Companies

113,361Contacts tracked

54,741Verified emails

49,034Mobile numbers

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The 25 largest middle market private equity firms based in the United States

Ranked by team size

Top 25 of 6,444 middle market private equity firms based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. RevenueBase Smart Search rates how each company's information relates to middle market private equity 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	Ares Management	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 5, 2026	1,001-5,000	3,975 contacts →
	Indirect evidence “Ares Management Corporation (NYSE: ARES) is a leading global alternative investment manager offering clients complementary primary and secondary investment solutions across the…” Source: RevenueBase Database · checked Sep 5, 2026
2	Brookfield	Indirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	3,915 contacts →
	Indirect evidence “We are a leading global investment firm that invests as long-term owners on behalf of institutions and individuals worldwide.” Source: RevenueBase Database · checked Sep 5, 2026
3	Nuveen, A Tiaa Company	Partial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,940 contacts →
	Partial evidence “Nuveen is a global investment leader, managing public and private assets for clients around the world and on behalf of TIAA, our parent company and one of the world’s largest…” Source: RevenueBase Database · checked Sep 5, 2026
4	The Carlyle Group	Strong evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,515 contacts →
	Strong evidence “Carlyle (NASDAQ: CG) is a global investment firm with deep industry expertise that deploys private capital across three business segments: Global Private Equity, Global Credit…” Source: RevenueBase Database · checked Sep 5, 2026
5	Bain Capital	Partial evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,068 contacts →
	Partial evidence “Founded in 1984, Bain Capital is one of the world’s leading private investment firms.” Source: RevenueBase Database · checked Sep 5, 2026
6	TPG	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,979 contacts →
	Indirect 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 5, 2026
7	Harbourvest Partners	Strong evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,353 contacts →
	Strong evidence “HarbourVest is an independent, global private markets firm with over 43 years of experience and $161 billion assets under management as of December 31, 2025.” Source: RevenueBase Database · checked Sep 5, 2026
8	H.I.G. Capital	Indirect evidence	Miami, FL, United StatesHQ checked Sep 5, 2026	501-1,000	1,301 contacts →
	Indirect evidence “H.I.G.” Source: RevenueBase Database · checked Sep 5, 2026
9	Warburg Pincus LLC	Indirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	1,290 contacts →
	Indirect evidence “Warburg Pincus LLC is the pioneer of global growth investing.” Source: RevenueBase Database · checked Sep 5, 2026
10	Golub Capital	Strong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,126 contacts →
	Strong evidence “Golub Capital is a market-leading, award-winning direct lender and experienced private credit manager.” Source: RevenueBase Database · checked Sep 5, 2026
11	Advent	Strong evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	501-1,000	1,025 contacts →
	Strong evidence “Advent is a leading global private equity investor committed to working in partnership with management teams, entrepreneurs, and founders to help transform businesses.” Source: RevenueBase Database · checked Sep 5, 2026
12	TA Associates	Strong evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	201-500	881 contacts →
	Strong evidence “TA is a leading global private equity firm focused on scaling growth in profitable companies.” Source: RevenueBase Database · checked Sep 5, 2026
13	Vista Equity Partners	Partial evidence	Austin, TX, United StatesHQ checked Sep 5, 2026	501-1,000	839 contacts →
	Partial evidence “Vista Equity Partners (Vista) is a leading global technology investor specializing in software.” Source: RevenueBase Database · checked Sep 5, 2026
14	General Atlantic	Indirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	820 contacts →
	Indirect evidence “General Atlantic is a leading global investor with more than four and a half decades of experience providing capital and strategic support to over 830 companies throughout its…” Source: RevenueBase Database · checked Sep 5, 2026
15	Sixth Street	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	501-1,000	802 contacts →
	Indirect 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 5, 2026
16	ALGER	Indirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	n/a	722 contacts →
	Indirect evidence “Founded in 1964, Alger is recognized as a pioneer of growth-style investment management.” Source: RevenueBase Database · checked Sep 5, 2026
17	Orix Corporation USA	Indirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	613 contacts →
	Indirect evidence “Established in the U.S.” Source: RevenueBase Database · checked Sep 5, 2026
18	Carlson	Indirect evidence	Minnetonka, MN, United StatesHQ checked Sep 5, 2026	n/a	604 contacts →
	Indirect evidence “Carlson's roots are set in 1938, when Curtis L.” Source: RevenueBase Database · checked Sep 5, 2026
19	Platinum Equity	Partial evidence	Beverly Hills, CA, United StatesHQ checked Sep 5, 2026	201-500	577 contacts →
	Partial evidence “Founded in 1995 by Tom Gores, Platinum Equity is a global investment firm with approximately ~$48 billion of assets under management and a portfolio of approximately 60 operating…” Source: RevenueBase Database · checked Sep 5, 2026
20	Hunt Companies, INC	Indirect evidence	El Paso, TX, United StatesHQ checked Sep 5, 2026	1,001-5,000	543 contacts →
	Indirect evidence “Hunt Companies is a family-owned principal investment firm founded in 1947, based in El Paso, TX, with interests in the real estate, infrastructure, and financial services sectors.” Source: RevenueBase Database · checked Sep 5, 2026
21	PSG	Partial evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	51-200	513 contacts →
	Partial evidence “PSG is a growth equity firm that partners with software and technology-enabled services companies to help them navigate transformational growth, capitalize on strategic…” Source: RevenueBase Database · checked Sep 5, 2026
22	Summit Partners	Partial evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	51-200	465 contacts →
	Partial evidence “Summit Partners is a global alternative investment firm with capital dedicated to growth equity, fixed income, and public equity opportunities.” Source: RevenueBase Database · checked Sep 5, 2026
23	Northland	Strong evidence	Newton, MA, United StatesHQ checked Sep 5, 2026	501-1,000	464 contacts →
	Strong evidence “Northland is a real estate private equity firm with $8 billion of assets under management, including more than residential units and 1.3 million square feet of commercial space…” Source: RevenueBase Database · checked Sep 5, 2026
24	The Riverside Company	Strong evidence	New York City, NY, United StatesHQ checked Sep 5, 2026	201-500	447 contacts →
	Strong evidence “The Riverside Company is a global investment firm focused on being one of the leading private capital options for business owners and employees at the smaller end of the middle…” Source: RevenueBase Database · checked Sep 5, 2026
25	Cd&r	Indirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	385 contacts →
	Indirect evidence “Founded in 1978, CD & R is an investment firm with an investment strategy predicated on building stronger, more profitable businesses.” Source: RevenueBase Database · checked Sep 5, 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: middle market private equity 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 middle market private equity firms.
Partial evidence: Its own public description names part of middle market private equity firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name middle market private equity 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 6,444 middle market private equity firms based in the United States

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Middle market private equity firms based in the United States at a glance

As of Sep 5, 2026

48.3%Verified-email coverage

43.3%Mobile-number coverage

17.6Average contacts per company

1-10Median size (employees)

14.7%Largest-city concentration · New York

Sep 5, 2026Page data refreshed

Companies by employee count

1-10

4,198

11-50

1,717

51-200

355

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

51,3620–30

3,11631–60

2861–90

2090–180

215180+

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 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 the United States whose own description of what they do matches “middle market private equity 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 middle market private equity 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 middle market private equity firms, and records with no verified work email. Companies headquartered outside United States 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, 54,741 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 firms by metro

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 middle market private equity 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 middle market private equity firms are there based in the United States?

RevenueBase identified 6,444 middle market private equity firms headquartered in the 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?

Ares Management, headquartered in Los Angeles, tops this list with the largest team on record.

Which city has the most middle market private equity firms?

New York leads with 945 headquartered companies, followed by Chicago (319) and Dallas (285).

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 54,741 verified decision-maker contacts tracked across these 6,444 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 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.