Company lists · Data refreshed September 2026

Top 25 Lower middle market private equity firms based in Boston, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 183 companies tracked

RevenueBase identified 183 lower middle market private equity firms headquartered in Boston, United States as of September 2026 and tracks 7,849 professional contacts across them, including 4,069 with verified work emails. New York is the largest hub.

This list covers lower middle market private equity firms headquartered in Boston, 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 4, 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 4, 2026 86% judged on-target in blind review

183Companies

7,849Contacts tracked

4,069Verified emails

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The 25 largest lower middle market private equity firms based in Boston, United States

Ranked by team size

Top 25 of 183 lower middle market private equity firms based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names lower middle market private equity firms: 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	Bain CapitalPartial evidence	Boston, MA, United StatesHQ checked Sep 4, 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 4, 2026
2	AdventStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 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 4, 2026
3	TA AssociatesStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	201-500	881
	“TA is a leading global private equity firm focused on scaling growth in profitable companies.” Source: company website · checked Sep 4, 2026
4	PSGPartial evidence	Boston, MA, United StatesHQ checked Sep 4, 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 4, 2026
5	Summit PartnersPartial evidence	Boston, MA, United StatesHQ checked Sep 4, 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 4, 2026
6	Berkshire PartnersStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	201-500	255
	“Berkshire Partners is a 100% employee-owned, multi-sector specialist investor in private and public equity, with a focus on North American-based, middle-market companies.” Source: company website · checked Sep 4, 2026
7	Charlesbank Capital PartnersStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	51-200	236
	“Based in Boston and New York City, Charlesbank is a leading middle-market private investment firm with $21.5 billion in assets under management as of 3/31/2026.” Source: company website · checked Sep 4, 2026
8	Audax Private EquityStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	201-500	211
	“Headquartered in Boston, with offices in San Francisco, New York, London and Hong Kong, Audax Private Equity is a leading private equity platform focused on investing across the…” Source: company website · checked Sep 4, 2026
9	THL PartnersStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	51-200	148
	“THL Partners is a Boston-based private equity firm investing in middle-market growth companies in three industry groups: Financial Technology & Services, Healthcare, and…” Source: company website · checked Sep 4, 2026
10	Great Hill PartnersStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	51-200	110
	“Founded in 1998, Great Hill Partners is a private equity firm targeting investments of $100 million to $750 million in high-growth companies across the software, financial…” Source: company website · checked Sep 4, 2026
11	Spectrum EquityPartial evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	51-200	94
	“Founded in 1994, Spectrum Equity is a leading growth equity firm with offices in Boston, San Francisco, and London.” Source: company website · checked Sep 4, 2026
12	Highvista StrategiesPartial evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	51-200	91
	“HighVista Strategies LLC is an employee-owned alternative asset manager that brings investors alpha opportunities in structurally inefficient markets.” Source: company website · checked Sep 4, 2026
13	BV Investment PartnersStrong evidence	Boston, United StatesHQ checked Sep 4, 2026	11-50	72
	“BV Investment Partners is one of the oldest and most experienced sector-focused private equity firms in North America.” Source: company website · checked Sep 4, 2026
14	Parthenon CapitalStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	11-50	68
	“Parthenon Capital Partners (“Parthenon” or “Parthenon Capital”) is a private equity firm that partners with and invests in management teams and their companies.” Source: company website · checked Sep 4, 2026
15	Silversmith Capital PartnersPartial evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	51-200	63
	“Founded in 2015, Silversmith Capital Partners is a Boston-based growth equity firm with over $5 billion in capital under management.” Source: company website · checked Sep 4, 2026
16	Volition CapitalPartial evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	11-50	63
	“Volition Capital is a growth equity firm established in 2010 that focuses on investing in high-growth, founder-owned technology businesses across the U.S.” Source: company website · checked Sep 4, 2026
17	BaypinePartial evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	11-50	61
	“BayPine is a private investment firm that seeks to create lasting value for the firm's investors, portfolio companies and communities in which they operate by driving innovation…” Source: company website · checked Sep 4, 2026
18	Cove Hill PartnersStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	51-200	53
	“Cove Hill Partners is a private equity firm focused on partnering with outstanding management teams to build market-leading technology and consumer companies.” Source: company website · checked Sep 4, 2026
19	Ampersand Capital PartnersStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	11-50	45
	“Founded in 1988, Ampersand is a middle-market private equity firm with $3 billion of assets under management dedicated to growth-oriented investments in the healthcare sector.” Source: company website · checked Sep 4, 2026
20	Copley Equity Partners LLCStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	11-50	42
	“Copley Equity Partners is a private investment firm based in Boston, MA, and Denver, CO.” Source: company website · checked Sep 4, 2026
21	NEW Boston FundStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	51-200	41
	“Founded in 1993, New Boston is a real estate investment management firm based in Boston, MA that manages over 1.2 billion dollars in private equity capital on behalf of high net…” Source: company website · checked Sep 4, 2026
22	M33 GrowthIndirect evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	11-50	38
	“M33 Growth is a venture and growth stage investment firm that seeks to partner with founders and CEOs to rapidly scale their companies and break through as industry leaders.” Source: company website · checked Sep 4, 2026
23	Solamere Capital, LLCStrong evidence	Boston, United StatesHQ checked Sep 4, 2026	11-50	37
	“Founded in 2008, Solamere is a multi-strategy private equity firm with offices in Boston and New York City.” Source: company website · checked Sep 4, 2026
24	Conjoin GroupStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	201-500	36
	“The ConJoin Group aligns with Venture Capital and Private Equity firms by investing our own capital,$250M in committed funds, and delivering a suite of services designed to…” Source: company website · checked Sep 4, 2026
25	ArtemisStrong evidence	Boston, MA, United StatesHQ checked Sep 4, 2026	11-50	32
	“Artemis Capital Partners is a Boston-based private equity firm focused on acquiring and growing differentiated industrial technology companies.” Source: company website · checked Sep 4, 2026

Showing 25 of 183 lower middle market private equity firms based in Boston, United States

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Lower middle market private equity firms based in Boston, United States at a glance

As of Sep 4, 2026

1-10Median size (employees)

New YorkLargest hub · 933 HQs

Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

107

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Boston, over 183 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 lower middle market private equity firms, 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 Boston, United States whose own description of what they do matches “lower middle market private equity firms”. 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 lower middle market private equity firms, and records with no verified work email. Companies headquartered outside Boston 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, 4,069 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 4, 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.

Lower middle market private equity firms by metro in the United States

Frequently asked

How many lower middle market private equity firms are there based in Boston, United States?

RevenueBase identified 183 lower middle market private equity firms headquartered in Boston, 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?

Bain Capital, headquartered in Boston, tops this list with the largest team on record.

Which city has the most lower middle market private equity firms?

New York leads with 933 headquartered companies, followed by Chicago (321) and Dallas (286).

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 4,069 verified decision-maker contacts tracked across these 183 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 4, 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.