Company lists · Data refreshed September 2026

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

Name: Lower middle market investment 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 28, 2026 143 companies tracked

RevenueBase identified 143 lower middle market investment firms headquartered in Boston, United States as of September 2026 and tracks 7,781 professional contacts across them, including 4,027 with verified work emails. Across the United States, New York is the largest hub for this category (855 companies); Boston has 143.

This list covers lower middle market investment 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 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 28, 2026 86% judged on-target in blind review

143Companies

7,781Contacts tracked

4,027Verified emails

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

Ranked by team size

Top 25 of 143 lower middle market investment firms based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to lower middle market investment 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	Bain Capital	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,068 contacts →
	Partial evidence “Founded in 1984, Bain Capital is one of the world’s leading private investment firms.” Source: RevenueBase Database · checked Sep 28, 2026
2	Advent	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 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 28, 2026
3	TA Associates	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 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 28, 2026
4	PSG	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 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 28, 2026
5	Summit Partners	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 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 28, 2026
6	Capstone Partners	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	51-200	276 contacts →
	Strong evidence “For over 20 years, Capstone Partners has been a trusted advisor to leading middle market companies, offering a fully integrated range of investment banking and financial advisory…” Source: RevenueBase Database · checked Sep 28, 2026
7	Berkshire Partners	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	201-500	255 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 28, 2026
8	Charlesbank Capital Partners	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	51-200	236 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 28, 2026
9	Audax Private Equity	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	201-500	211 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 28, 2026
10	THL Partners	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	51-200	148 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 28, 2026
11	Great Hill Partners	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	51-200	110 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
12	AGC Partners	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	51-200	109 contacts →
	Strong evidence “AGC Partners is a global technology investment bank focused on middle market M&A and growth equity financings for emerging growth companies.” Source: RevenueBase Database · checked Sep 28, 2026
13	Spectrum Equity	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	51-200	94 contacts →
	Indirect evidence “Founded in 1994, Spectrum Equity is a leading growth equity firm with offices in Boston, San Francisco, and London.” Source: RevenueBase Database · checked Sep 28, 2026
14	Highvista Strategies	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	51-200	91 contacts →
	Partial evidence “HighVista Strategies LLC is an employee-owned alternative asset manager that brings investors alpha opportunities in structurally inefficient markets.” Source: RevenueBase Database · checked Sep 28, 2026
15	BV Investment Partners	Partial evidence	Boston, United StatesHQ checked Sep 28, 2026	11-50	72 contacts →
	Partial evidence “BV Investment Partners is one of the oldest and most experienced sector-focused private equity firms in North America.” Source: RevenueBase Database · checked Sep 28, 2026
16	Parthenon Capital	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	11-50	68 contacts →
	Indirect evidence “Parthenon Capital Partners (“Parthenon” or “Parthenon Capital”) is a private equity firm that partners with and invests in management teams and their companies.” Source: RevenueBase Database · checked Sep 28, 2026
17	Provident Healthcare Partners	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	11-50	58 contacts →
	Strong evidence “Provident is the leading investment banking firm specializing in merger and acquisition advisory, strategic planning, and capital formation for middle-market and emerging growth…” Source: RevenueBase Database · checked Sep 28, 2026
18	Copley Equity Partners LLC	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	11-50	42 contacts →
	Partial evidence “Copley Equity Partners is a private investment firm based in Boston, MA, and Denver, CO.” Source: RevenueBase Database · checked Sep 28, 2026
19	Solamere Capital, LLC	Indirect evidence	Boston, United StatesHQ checked Sep 28, 2026	11-50	37 contacts →
	Indirect evidence “Founded in 2008, Solamere is a multi-strategy private equity firm with offices in Boston and New York City.” Source: RevenueBase Database · checked Sep 28, 2026
20	Covington Associates	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	11-50	36 contacts →
	Partial evidence “Covington Associates is an investment banking firm offering advisory services in the areas of M&A, capital raising, strategic advisory, fairness opinions, and valuations to…” Source: RevenueBase Database · checked Sep 28, 2026
21	Conjoin Group	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	201-500	36 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 28, 2026
22	BOWEN	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	11-50	32 contacts →
	Indirect evidence “Bowen partners with growth tech companies to drive value creation within the innovation economy.” Source: RevenueBase Database · checked Sep 28, 2026
23	Union Park Capital	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	n/a	31 contacts →
	Strong evidence “Union Park Capital is a private equity investment firm focused solely on lower middle-market Industrial Technology companies.” Source: RevenueBase Database · checked Sep 28, 2026
24	Pathlight Capital	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	11-50	28 contacts →
	Partial evidence “Pathlight Capital is a private credit investment manager dedicated to meeting the needs of companies that operate across a broad range of industries by providing asset-based loans…” Source: RevenueBase Database · checked Sep 28, 2026
25	Sverica Capital Management	Strong evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	11-50	27 contacts →
	Strong evidence “Sverica Capital Management LP is a leading growth-oriented lower middle market private equity firm with $2.2 billion in aggregate committed capital.” Source: RevenueBase Database · checked Sep 28, 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: lower middle market investment 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 lower middle market investment firms.
Partial evidence: Its own public description names part of lower middle market investment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name lower middle market investment 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 143 lower middle market investment firms based in Boston, United States

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

As of Sep 28, 2026

51.8%Verified-email coverage

54.4Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

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 for Boston, so it is reported there. Company counts and contact totals on this page are exact for Boston, over 143 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 investment 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 Boston, United States whose own description of what they do matches “lower middle market investment 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 lower middle market investment 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 lower middle market investment 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 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, 4,027 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 28, 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 investment 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 lower middle market investment 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 lower middle market investment firms are there based in Boston, United States?

RevenueBase identified 143 lower middle market investment 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 in the United States has the most lower middle market investment firms?

New York leads the United States with 855 headquartered companies, followed by Chicago (276) and Dallas (204). Boston has 143.

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 4,027 verified decision-maker contacts tracked across these 143 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 28, 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.