Company lists · Data refreshed September 2026

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

Name: Middle market private equity companies 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 6,222 companies tracked

RevenueBase identified 6,222 middle market private equity companies headquartered in the United States as of September 2026 and tracks 101,822 professional contacts across them, including 48,511 with verified work emails and 44,258 with mobile numbers. New York is the largest hub.

This list covers middle market private equity companies 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, 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

6,222Companies

101,822Contacts tracked

48,511Verified emails

44,258Mobile numbers

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

Ranked by team size

Top 25 of 6,222 middle market private equity companies based in the 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	BrookfieldIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	3,915
	“We are a leading global investment firm that invests as long-term owners on behalf of institutions and individuals worldwide.” Source: company website · checked Sep 5, 2026
2	The Carlyle GroupStrong evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,515
	“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: company website · checked Sep 5, 2026
3	Bain CapitalPartial evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	1,001-5,000	2,068
	“Founded in 1984, Bain Capital is one of the world’s leading private investment firms.” Source: company website · checked Sep 5, 2026
4	TPGIndirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,979
	“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: company website · checked Sep 5, 2026
5	Harbourvest PartnersStrong evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,353
	“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: company website · checked Sep 5, 2026
6	H.I.G. CapitalIndirect evidence	Miami, FL, United StatesHQ checked Sep 5, 2026	501-1,000	1,301
	“H.I.G.” Source: company website · checked Sep 5, 2026
7	Warburg Pincus LLCIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	1,290
	“Warburg Pincus LLC is the pioneer of global growth investing.” Source: company website · checked Sep 5, 2026
8	Golub CapitalStrong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,126
	“Golub Capital is a market-leading, award-winning direct lender and experienced private credit manager.” Source: company website · checked Sep 5, 2026
9	AdventStrong evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	501-1,000	1,025
	“Advent is a leading global private equity investor committed to working in partnership with management teams, entrepreneurs, and founders to help transform businesses.” Source: company website · checked Sep 5, 2026
10	TA AssociatesStrong evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	201-500	881
	“TA is a leading global private equity firm focused on scaling growth in profitable companies.” Source: company website · checked Sep 5, 2026
11	Vista Equity PartnersPartial evidence	Austin, TX, United StatesHQ checked Sep 5, 2026	501-1,000	839
	“Vista Equity Partners (Vista) is a leading global technology investor specializing in software.” Source: company website · checked Sep 5, 2026
12	General AtlanticIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	820
	“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: company website · checked Sep 5, 2026
13	Sixth StreetIndirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	501-1,000	802
	“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: company website · checked Sep 5, 2026
14	ALGERIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	n/a	722
	“Founded in 1964, Alger is recognized as a pioneer of growth-style investment management.” Source: company website · checked Sep 5, 2026
15	Orix Corporation USAIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	613
	“Established in the U.S.” Source: company website · checked Sep 5, 2026
16	Platinum EquityPartial evidence	Beverly Hills, CA, United StatesHQ checked Sep 5, 2026	201-500	577
	“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: company website · checked Sep 5, 2026
17	PSGPartial evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	51-200	513
	“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: company website · checked Sep 5, 2026
18	Summit PartnersPartial evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	51-200	465
	“Summit Partners is a global alternative investment firm with capital dedicated to growth equity, fixed income, and public equity opportunities.” Source: company website · checked Sep 5, 2026
19	NorthlandStrong evidence	Newton, MA, United StatesHQ checked Sep 5, 2026	501-1,000	464
	“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: company website · checked Sep 5, 2026
20	The Riverside CompanyStrong evidence	New York City, NY, United StatesHQ checked Sep 5, 2026	201-500	447
	“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: company website · checked Sep 5, 2026
21	Cd&rIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	385
	“Founded in 1978, CD & R is an investment firm with an investment strategy predicated on building stronger, more profitable businesses.” Source: company website · checked Sep 5, 2026
22	Centerbridge Partners, L.PIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	368
	Source: company website · checked Sep 5, 2026
23	Adams Street PartnersStrong evidence	Chicago, IL, United StatesHQ checked Sep 5, 2026	201-500	367
	“Adams Street Partners is a global investment firm managing a comprehensive suite of private markets investment solutions.” Source: company website · checked Sep 5, 2026
24	CNL Financial GroupPartial evidence	Orlando, FL, United StatesHQ checked Sep 5, 2026	201-500	364
	“CNL Financial Group (CNL) is a leading private investment management firm providing alternative investments opportunities.” Source: company website · checked Sep 5, 2026
25	NEW Mountain CapitalStrong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	346
	“New Mountain Capital (“New Mountain”) is an alternative investment manager with private equity, credit and net lease strategies.” Source: company website · checked Sep 5, 2026

Showing 25 of 6,222 middle market private equity companies based in the United States

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

As of Sep 5, 2026

1-10Median size (employees)

New YorkLargest hub · 911 HQs

44,258Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

4,067

11-50

1,646

51-200

334

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

45,552

31–60

2,737

61–90

90–180

180+

177

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 the 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 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 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, 48,511 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

Frequently asked

How many middle market private equity companies are there based in the United States?

RevenueBase identified 6,222 middle market private equity companies 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?

Brookfield, headquartered in New York, 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 48,511 verified decision-maker contacts tracked across these 6,222 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.