Company lists · Data refreshed September 2026

Top 25 Private investment companies based in the United States

Name: Private investment 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 20, 2026 4,523 companies tracked

RevenueBase identified 4,523 private investment companies headquartered in the United States as of September 2026 and tracks 80,508 professional contacts across them, including 37,579 with verified work emails. New York is the largest hub.

This list covers private investment 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 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 20, 2026 86% judged on-target in blind review

4,523Companies

80,508Contacts tracked

37,579Verified emails

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The 25 largest private investment companies based in the United States

Ranked by team size

Top 25 of 4,523 private investment companies based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to private investment companies: 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	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	3,915 contacts →
	Partial 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 20, 2026
2	The Carlyle Group	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 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 20, 2026
3	Bain Capital	Strong evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,068 contacts →
	Strong evidence “Founded in 1984, Bain Capital is one of the world’s leading private investment firms.” Source: RevenueBase Database · checked Sep 20, 2026
4	Lincoln International	Strong evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,489 contacts →
	Strong evidence “Lincoln International, Inc.(NYSE: LCLN) is a trusted investment banking advisor to business owners and senior executives of leading private equity firms and their portfolio…” Source: RevenueBase Database · checked Sep 20, 2026
5	Harbourvest Partners	Partial evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,353 contacts →
	Partial 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 20, 2026
6	H.I.G. Capital	Indirect evidence	Miami, FL, United StatesHQ checked Sep 20, 2026	501-1,000	1,301 contacts →
	Indirect evidence “H.I.G.” Source: RevenueBase Database · checked Sep 20, 2026
7	Warburg Pincus LLC	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	501-1,000	1,290 contacts →
	Indirect evidence “Warburg Pincus LLC is the pioneer of global growth investing.” Source: RevenueBase Database · checked Sep 20, 2026
8	Golub Capital	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 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 20, 2026
9	Advent	Partial evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	501-1,000	1,025 contacts →
	Partial 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 20, 2026
10	Nassau Street Partners	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	n/a	904 contacts →
	Indirect evidence “Nassau Street Partners is an independent capital advisory firm focused on mergers and acquisitions, capital markets advisory, and strategic financial solutions for early-stage and…” Source: RevenueBase Database · checked Sep 20, 2026
11	TA Associates	Partial evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	201-500	881 contacts →
	Partial evidence “TA is a leading global private equity firm focused on scaling growth in profitable companies.” Source: RevenueBase Database · checked Sep 20, 2026
12	Vista Equity Partners	Indirect evidence	Austin, TX, United StatesHQ checked Sep 20, 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 20, 2026
13	General Atlantic	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 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 20, 2026
14	PSG	Indirect evidence	Boston, MA, United StatesHQ checked Sep 20, 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 20, 2026
15	BDT & MSD Partners	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	201-500	504 contacts →
	Indirect evidence “BDT & MSD Partners is a merchant bank serving founders, family business owners, and long-term strategic investors.” Source: RevenueBase Database · checked Sep 20, 2026
16	Summit Partners	Partial evidence	Boston, MA, United StatesHQ checked Sep 20, 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 20, 2026
17	The Riverside Company	Strong evidence	New York City, NY, United StatesHQ checked Sep 20, 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 20, 2026
18	Cd&r	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	51-200	385 contacts →
	Partial 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 20, 2026
19	Adams Street Partners	Strong evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	201-500	367 contacts →
	Strong evidence “Adams Street Partners is a global investment firm managing a comprehensive suite of private markets investment solutions.” Source: RevenueBase Database · checked Sep 20, 2026
20	W Capital Partners	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	n/a	337 contacts →
	Partial 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 20, 2026
21	Shore Capital Partners	Partial evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	327 contacts →
	Partial 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 20, 2026
22	Geller	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	51-200	310 contacts →
	Partial evidence “Geller provides financial services and strategic advisory to private companies and not-for-profit organizations.” Source: RevenueBase Database · checked Sep 20, 2026
23	Thoma Bravo	Partial evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	201-500	309 contacts →
	Partial 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 20, 2026
24	AMG	Partial evidence	West Palm Beach, FL, United StatesHQ checked Sep 20, 2026	201-500	297 contacts →
	Partial evidence “AMG is a leading partner to independent investment management firms globally.” Source: RevenueBase Database · checked Sep 20, 2026
25	Alpine Investors	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 20, 2026	51-200	278 contacts →
	Partial evidence “Alpine Investors is a people-driven private equity firm that invests in software and services businesses.” Source: RevenueBase Database · checked Sep 20, 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: private investment companies. 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 private investment companies.
Partial evidence: Its own public description names part of private investment companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name private investment companies. 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 4,523 private investment companies based in the United States

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Private investment companies based in the United States at a glance

As of Sep 20, 2026

46.7%Verified-email coverage

17.8Average contacts per company

1-10Median size (employees)

16.8%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

2,926

11-50

1,248

51-200

251

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 4,523 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 private investment companies, 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 “private investment companies”. 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 private investment companies), 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 private investment 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 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, 37,579 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 20, 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.

Private investment companies 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 private investment companies, 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 private investment companies are there based in the United States?

RevenueBase identified 4,523 private investment 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 private investment companies?

New York leads with 759 headquartered companies, followed by Chicago (222) and Los Angeles (173).

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 37,579 verified decision-maker contacts tracked across these 4,523 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 20, 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.