Company lists · Data refreshed September 2026

Top 25 Middle market pe firms based in the United States

Name: Middle market pe 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 21, 2026 5,030 companies tracked

RevenueBase identified 5,030 middle market pe firms headquartered in the United States as of September 2026 and tracks 82,147 professional contacts across them, including 39,595 with verified work emails. New York is the largest hub.

This list covers middle market pe 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 21, 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 21, 2026 86% judged on-target in blind review

5,030Companies

82,147Contacts tracked

39,595Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest middle market pe firms based in the United States

Ranked by team size

Top 25 of 5,030 middle market pe firms based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to middle market pe 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	The Carlyle Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,515 contacts →
	Indirect 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 21, 2026
2	Bain Capital	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,068 contacts →
	Indirect evidence “Founded in 1984, Bain Capital is one of the world’s leading private investment firms.” Source: RevenueBase Database · checked Sep 21, 2026
3	H.I.G. Capital	Indirect evidence	Miami, FL, United StatesHQ checked Sep 21, 2026	501-1,000	1,301 contacts →
	Indirect evidence “H.I.G.” Source: RevenueBase Database · checked Sep 21, 2026
4	Warburg Pincus LLC	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	1,290 contacts →
	Indirect evidence “Warburg Pincus LLC is the pioneer of global growth investing.” Source: RevenueBase Database · checked Sep 21, 2026
5	Golub Capital	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,126 contacts →
	Partial evidence “Golub Capital is a market-leading, award-winning direct lender and experienced private credit manager.” Source: RevenueBase Database · checked Sep 21, 2026
6	Advent	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	501-1,000	1,025 contacts →
	Indirect 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 21, 2026
7	TA Associates	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	201-500	881 contacts →
	Indirect evidence “TA is a leading global private equity firm focused on scaling growth in profitable companies.” Source: RevenueBase Database · checked Sep 21, 2026
8	Vista Equity Partners	Indirect evidence	Austin, TX, United StatesHQ checked Sep 21, 2026	501-1,000	839 contacts →
	Indirect evidence “Vista Equity Partners (Vista) is a leading global technology investor specializing in software.” Source: RevenueBase Database · checked Sep 21, 2026
9	General Atlantic	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
10	Orix Corporation USA	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1,001-5,000	613 contacts →
	Indirect evidence “Established in the U.S.” Source: RevenueBase Database · checked Sep 21, 2026
11	PSG	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	51-200	513 contacts →
	Indirect 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 21, 2026
12	Summit Partners	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	51-200	465 contacts →
	Indirect 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 21, 2026
13	The Riverside Company	Partial evidence	New York City, NY, United StatesHQ checked Sep 21, 2026	201-500	447 contacts →
	Partial 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 21, 2026
14	Cd&r	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
15	Centerbridge Partners, L.P	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	368 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
16	Adams Street Partners	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	367 contacts →
	Partial evidence “Adams Street Partners is a global investment firm managing a comprehensive suite of private markets investment solutions.” Source: RevenueBase Database · checked Sep 21, 2026
17	NEW Mountain Capital	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	346 contacts →
	Indirect evidence “New Mountain Capital (“New Mountain”) is an alternative investment manager with private equity, credit and net lease strategies.” Source: RevenueBase Database · checked Sep 21, 2026
18	Midcap Financial	Strong evidence	Bethesda, MD, United StatesHQ checked Sep 21, 2026	201-500	339 contacts →
	Strong evidence “MidCap Financial is a middle-market focused, specialty finance firm that provides senior debt solutions to companies across all industries.” Source: RevenueBase Database · checked Sep 21, 2026
19	W Capital Partners	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	n/a	337 contacts →
	Indirect evidence “W Capital Partners is a private equity firm that provides secondary liquidity to shareholders in private businesses and growth capital for those companies.” Source: RevenueBase Database · checked Sep 21, 2026
20	Shore Capital Partners	Strong evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	51-200	327 contacts →
	Strong evidence “Shore Capital, a Chicago-based private equity firm with an office in Nashville, is an investor in lower-middle market companies in the Healthcare, Food and Beverage, Business…” Source: RevenueBase Database · checked Sep 21, 2026
21	Monroe Capital LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	325 contacts →
	Partial evidence “Monroe Capital LLC (“Monroe”) is a premier asset management firm specializing in private credit markets across various strategies, including direct lending, technology finance…” Source: RevenueBase Database · checked Sep 21, 2026
22	Thoma Bravo	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	309 contacts →
	Indirect evidence “Thoma Bravo is the world’s largest software-focused investment firm, with more than $172 billion in assets under management as of March 31, 2026.” Source: RevenueBase Database · checked Sep 21, 2026
23	AMG	Indirect evidence	West Palm Beach, FL, United StatesHQ checked Sep 21, 2026	201-500	297 contacts →
	Indirect evidence “AMG is a leading partner to independent investment management firms globally.” Source: RevenueBase Database · checked Sep 21, 2026
24	Alpine Investors	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	51-200	278 contacts →
	Indirect evidence “Alpine Investors is a people-driven private equity firm that invests in software and services businesses.” Source: RevenueBase Database · checked Sep 21, 2026
25	HGGC	Indirect evidence	Palo Alto, CA, United StatesHQ checked Sep 21, 2026	51-200	272 contacts →
	Indirect evidence “Since 2007, we’ve specialized in transforming good businesses into great companies through our differentiated approach to partnership investing.” Source: RevenueBase Database · checked Sep 21, 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 pe 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 pe firms.
Partial evidence: Its own public description names part of middle market pe 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 pe 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 5,030 middle market pe firms based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 39,595 reachable decision-makers.

Free signup · no credit card

View the full list →

Middle market pe firms based in the United States at a glance

As of Sep 21, 2026

48.2%Verified-email coverage

16.3Average contacts per company

1-10Median size (employees)

15.1%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

3,284

11-50

1,341

51-200

277

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 5,030 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 pe 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 pe 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 pe 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 pe 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, 39,595 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 21, 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 pe 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 pe 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 pe firms are there based in the United States?

RevenueBase identified 5,030 middle market pe 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?

The Carlyle Group, headquartered in Washington, tops this list with the largest team on record.

Which city has the most middle market pe firms?

New York leads with 758 headquartered companies, followed by Chicago (273) and Dallas (224).

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 39,595 verified decision-maker contacts tracked across these 5,030 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 21, 2026.

Ready to reach these companies? Verified emails and direct dials for all 5,030 middle market pe firms based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Middle market pe firms by geography

Browse the directory

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.