Company lists · Data refreshed September 2026

Top 23 Upper middle market private equity firms based in Stamford, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 30 companies tracked

RevenueBase identified 30 upper middle market private equity firms headquartered in Stamford, United States as of September 2026 and tracks 447 professional contacts across them, including 277 with verified work emails. New York is the largest hub.

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

30Companies

447Contacts tracked

277Verified emails

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

The 23 largest upper middle market private equity firms based in Stamford, United States

Ranked by team size

Top 23 of 30 upper middle market private equity firms based in Stamford, 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	First Reserve	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	51-200	79 contacts →
	Strong evidence “Founded in 1983, First Reserve is a leading global private equity firm investing across energy, utility, and industrial markets.” Source: RevenueBase Database · checked Sep 21, 2026
2	OAK HC FT	Partial evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	54 contacts →
	Partial evidence “Oak HC/FT is a venture and growth equity firm investing in companies driving transformation in healthcare and fintech, two uniquely complementary and high-growth sectors.” Source: RevenueBase Database · checked Sep 21, 2026
3	MC Credit Partners LP	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	39 contacts →
	Strong evidence “MC Credit Partners LP ("MCCP") offers creative and comprehensive financing solutions to middle market companies.” Source: RevenueBase Database · checked Sep 21, 2026
4	Clearview Capital, L.P	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	38 contacts →
	Strong evidence “Founded in Clearview Capital is a private investment firm specializing in the acquisition and recapitalization of lower-middle market companies in North America.” Source: RevenueBase Database · checked Sep 21, 2026
5	Avesi Partners	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	30 contacts →
	Strong evidence “Avesi Partners is a private equity group that provides the expertise and resources to empower businesses to attain their full vision with confidence.” Source: RevenueBase Database · checked Sep 21, 2026
6	Gainline Capital Partners	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	1-10	26 contacts →
	Strong evidence “Gainline Capital Partners is a private equity firm that invests in U.S.” Source: RevenueBase Database · checked Sep 21, 2026
7	Olympus Partners	Indirect evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	23 contacts →
	Indirect evidence “Founded in 1988, Olympus manages over $12.0 billion on behalf of corporate pension plans, public retirement systems, university endowment funds, and the executives of Olympus'…” Source: RevenueBase Database · checked Sep 21, 2026
8	Brookside Capital Partners	Indirect evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	17 contacts →
	Indirect evidence “Brookside Capital Partners has invested over $1.5 billion across five funds since its founding in 2001.” Source: RevenueBase Database · checked Sep 21, 2026
9	Brooks, Houghton & Company, INC	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	17 contacts →
	Strong evidence “Brooks, Houghton & Company, Inc.("BHC") is a merchant banking firm dedicated to providing investment banking services and direct investment to middle market private and public…” Source: RevenueBase Database · checked Sep 21, 2026
10	Longrange Capital	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	17 contacts →
	Strong evidence “Founded in 2019, LongRange Capital was formed to take a longer-term perspective to investing and to build stronger and better middle market businesses through a company-focused…” Source: RevenueBase Database · checked Sep 21, 2026
11	Hamilton Robinson Capital Partners	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	1-10	15 contacts →
	Strong evidence “Hamilton Robinson Capital Partners is a lower-middle market private equity firm focused on making control investments in North American-based commercial service, distribution…” Source: RevenueBase Database · checked Sep 21, 2026
12	Cohen Private Ventures, LLC	Partial evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	1-10	13 contacts →
	Partial evidence “Cohen Private Ventures invests long-term capital, primarily in direct private investments and other opportunistic transactions, on behalf of Steven A.” Source: RevenueBase Database · checked Sep 21, 2026
13	Garmark Partners	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	12 contacts →
	Strong evidence “Founded in 1997, GarMark Partners is one of the longest-tenured managers of private junior debt and structured equity capital in North America, with approximately $1.3 billion of…” Source: RevenueBase Database · checked Sep 21, 2026
14	Broadview Real Estate Partners	Indirect evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	1-10	8 contacts →
	Indirect evidence “Broadview Real Estate Partners is an opportunistic real estate investment business deploying capital primarily through real estate operating companies.” Source: RevenueBase Database · checked Sep 21, 2026
15	Drum Capital Management, LLC	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	8 contacts →
	Strong evidence “Drum Capital Management is a specialized investment management firm dedicated to deep value lower middle market investment opportunities, including special situations, turnaround…” Source: RevenueBase Database · checked Sep 21, 2026
16	Brookside Equity Partners	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	1-10	6 contacts →
	Strong evidence “With roots dating back 40 years, Brookside Equity Partners makes strategic private equity investments in middle-market companies.” Source: RevenueBase Database · checked Sep 21, 2026
17	Waypoint Capital Partners	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	6 contacts →
	Strong evidence “WayPoint is an operationally focused private equity firm purpose-built for the lower middle market with a family office heritage.” Source: RevenueBase Database · checked Sep 21, 2026
18	Compass Partners Capital, LLC	Indirect evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	5 contacts →
	Indirect evidence “Compass Partners brings elite experience and focus to help companies seize 21st century opportunities.” Source: RevenueBase Database · checked Sep 21, 2026
19	Z2 Investment Management, LP	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Strong evidence “Z2 is an SEC-registered alternative investment management company focused on non-sponsored, low to middle market direct lending.” Source: RevenueBase Database · checked Sep 21, 2026
20	Small Business Community Capital Sbcc	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	5 contacts →
	Strong evidence “Small Business Community Capital II (SBCC), is a private equity and private debt impact fund that invests in small and lower middle market companies through customized capital…” Source: RevenueBase Database · checked Sep 21, 2026
21	The Cathay Funds	Indirect evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	4 contacts →
	Indirect evidence “The Cathay family of funds, managed by New China Capital Management, consists of five funds dedicated to direct investment in China with total invested capital of US$800 million.” Source: RevenueBase Database · checked Sep 21, 2026
22	Roar Capital	Strong evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	3 contacts →
	Strong evidence “Roar Capital focuses on lower middle market public and private opportunities.” Source: RevenueBase Database · checked Sep 21, 2026
23	Centripetal Capital Partners	Indirect evidence	Stamford, CT, United StatesHQ checked Sep 21, 2026	11-50	1 contacts →
	Indirect evidence “Centricap is a multi-stage venture capital firm with an innovative fund structure that provides greater flexibility and opportunity for limited partners than a traditional fund.” 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 23 of 30 upper middle market private equity firms based in Stamford, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 277 reachable decision-makers.

Free signup · no credit card

View the full list →

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

As of Sep 21, 2026

62.0%Verified-email coverage

14.9Average contacts per company

11-50Median size (employees)

3193.3%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Email recency for this list is measured across the whole United States list rather than for Stamford, so it is reported there. Company counts and contact totals on this page are exact for Stamford, over 30 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 Stamford, 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 Stamford 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, 277 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 Stamford, United States?

RevenueBase identified 30 upper middle market private equity firms headquartered in Stamford, 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?

First Reserve, headquartered in Stamford, 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 277 verified decision-maker contacts tracked across these 30 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 30 upper middle market private equity firms based in Stamford, United States. Start with a free account, no credit card.

Download this list →

Related lists

Upper middle market private equity 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.