Company lists · Data refreshed September 2026

Top 25 Upper middle market private equity firms based in New York, United States

Name: Upper middle market private equity firms based in New York, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 958 companies tracked

RevenueBase identified 958 upper middle market private equity firms headquartered in New York, United States as of September 2026 and tracks 35,098 professional contacts across them, including 14,490 with verified work emails. New York is the largest hub.

This list covers upper middle market private equity firms headquartered in New York, 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

958Companies

35,098Contacts tracked

14,490Verified emails

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The 25 largest upper middle market private equity firms based in New York, United States

Ranked by team size

Top 25 of 958 upper middle market private equity firms based in New York, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to upper 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	Brookfield	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
2	Nuveen, A Tiaa Company	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
3	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
4	Golub Capital	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
5	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
6	ALGER	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
7	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
8	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
9	NEW Mountain Capital	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	346 contacts →
	Strong 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
10	W Capital Partners	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	n/a	337 contacts →
	Strong 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
11	Churchill Asset Management	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	260 contacts →
	Indirect evidence “Churchill, an investment-specialist affiliate of Nuveen (the asset manager of TIAA), provides customized financing solutions to U.S.” Source: RevenueBase Database · checked Sep 21, 2026
12	Needham & Company	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	250 contacts →
	Indirect evidence “Needham & Company, LLC is a nationally recognized investment banking and asset management Firm focused solely on growth companies and their investors.” Source: RevenueBase Database · checked Sep 21, 2026
13	Muzinich & CO	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	243 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
14	Coatue Management	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	239 contacts →
	Strong evidence “Building on our heritage in public markets investing, Coatue’s lifecycle investment platform has expanded across public and private markets over the past 25+ years.” Source: RevenueBase Database · checked Sep 21, 2026
15	Baron Capital	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	237 contacts →
	Partial evidence “Baron Capital is an asset management firm focused on delivering growth equity investment solutions.” Source: RevenueBase Database · checked Sep 21, 2026
16	Apogem Capital	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	229 contacts →
	Strong evidence “Apogem Capital is a leading alternatives investment manager with decades of experience investing in the middle market.” Source: RevenueBase Database · checked Sep 21, 2026
17	American Securities	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	220 contacts →
	Indirect evidence “Founded in 1994, American Securities is a leading U.S.” Source: RevenueBase Database · checked Sep 21, 2026
18	Avenue Capital Group	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	218 contacts →
	Indirect evidence “Avenue Capital Group, founded in 1995 by Marc Lasry and Sonia Gardner, is primarily focused on making opportunistic credit and other special situations investments across the…” Source: RevenueBase Database · checked Sep 21, 2026
19	AEA Investors	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	207 contacts →
	Strong evidence “AEA Investors is a leading global alternative investment firm that has partnered with exceptional middle-market businesses for over 55 years.” Source: RevenueBase Database · checked Sep 21, 2026
20	Star Mountain Capital	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	172 contacts →
	Partial evidence “Bringing large market expertise to smaller companies, Star Mountain’s philosophies include a data-driven and systematic approach to investing.” Source: RevenueBase Database · checked Sep 21, 2026
21	Siguler Guff & Company	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	165 contacts →
	Strong evidence “Siguler Guff is a multi-strategy private markets investment firm which, together with its affiliates, has approximately $18.4 billion of assets under management as of December 31…” Source: RevenueBase Database · checked Sep 21, 2026
22	Stripes	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	160 contacts →
	Partial evidence “Based in New York City, Stripes is a leading growth equity firm that invests in branded consumer and enterprise companies.” Source: RevenueBase Database · checked Sep 21, 2026
23	Searchlight Capital Partners	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	150 contacts →
	Partial evidence “Searchlight Capital Partners is a private investment firm that identifies and develops distinctive opportunities for its investors and partner companies.” Source: RevenueBase Database · checked Sep 21, 2026
24	Arsenal Capital Partners	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	142 contacts →
	Strong evidence “Arsenal is a leading private equity firm that specializes in investments in middle-market industrial growth and healthcare companies.” Source: RevenueBase Database · checked Sep 21, 2026
25	Bregal Sagemount	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	142 contacts →
	Partial evidence “Bregal Sagemount is a growth-focused private capital firm with over $11 billion in committed capital.” 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: upper 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 upper middle market private equity firms.
Partial evidence: Its own public description names part of upper 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 upper 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 958 upper middle market private equity firms based in New York, United States

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Upper middle market private equity firms based in New York, United States at a glance

As of Sep 21, 2026

41.3%Verified-email coverage

36.6Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

524

11-50

337

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured across the whole United States list rather than for New York, so it is reported there. Company counts and contact totals on this page are exact for New York, over 958 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 upper 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 New York, United States whose own description of what they do matches “upper 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 upper 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 upper middle market private equity firms, and records with no verified work email. Companies headquartered outside New York 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, 14,490 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.

Upper middle market private equity 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 upper 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 upper middle market private equity firms are there based in New York, United States?

RevenueBase identified 958 upper middle market private equity firms headquartered in New York, 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 upper middle market private equity firms?

New York leads with 958 headquartered companies, followed by Chicago (333) and Dallas (294).

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 14,490 verified decision-maker contacts tracked across these 958 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.

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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.