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Company lists · Data refreshed September 2026

Top 25 Private equity portfolio companies based in Boston, United States

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 180 companies tracked

RevenueBase identified 180 private equity portfolio companies headquartered in Boston, United States as of September 2026 and tracks 7,741 professional contacts across them, including 4,012 with verified work emails. New York is the largest hub.

This list covers private equity portfolio companies 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 5, 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 5, 2026 86% judged on-target in blind review
180Companies
7,741Contacts tracked
4,012Verified emails
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The 25 largest private equity portfolio companies based in Boston, United States

Ranked by team size
Top 25 of 180 private equity portfolio companies based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names private equity portfolio companies: 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.
#CompanyHeadquartersEmployeesContacts
1
Bain CapitalPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 20261,001-5,0002,068

“Founded in 1984, Bain Capital is one of the world’s leading private investment firms.”

Source: company website · checked Sep 5, 2026
2
AdventStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 2026501-1,0001,025

“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 5, 2026
3
TA AssociatesStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 2026201-500881

“TA is a leading global private equity firm focused on scaling growth in profitable companies.”

Source: company website · checked Sep 5, 2026
4
PSGPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-200513

“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 5, 2026
5
Summit PartnersPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-200465

“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 5, 2026
6
Berkshire PartnersStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 2026201-500255

“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 5, 2026
7
Charlesbank Capital PartnersPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-200236

“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 5, 2026
8
Audax Private EquityStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 2026201-500211

“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 5, 2026
9
THL PartnersStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-200148

“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 5, 2026
10
Great Hill PartnersStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-200110

“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 5, 2026
11
Spectrum EquityPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-20094

“Founded in 1994, Spectrum Equity is a leading growth equity firm with offices in Boston, San Francisco, and London.”

Source: company website · checked Sep 5, 2026
12
BV Investment PartnersStrong evidence
Boston, United StatesHQ checked Sep 5, 202611-5072

“BV Investment Partners is one of the oldest and most experienced sector-focused private equity firms in North America.”

Source: company website · checked Sep 5, 2026
13
Parthenon CapitalStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5068

“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 5, 2026
14
Silversmith Capital PartnersPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-20063

“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 5, 2026
15
Volition CapitalPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5063

“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 5, 2026
16
BaypineStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5061

“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 5, 2026
17
Cove Hill PartnersStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-20053

“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 5, 2026
18
OpenviewIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5047

“OpenView is a venture capital firm on a mission to change the way the world works.”

Source: company website · checked Sep 5, 2026
19
Ampersand Capital PartnersStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5045

“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 5, 2026
20
Copley Equity Partners LLCStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5042

“Copley Equity Partners is a private investment firm based in Boston, MA, and Denver, CO.”

Source: company website · checked Sep 5, 2026
21
M33 GrowthIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5038

“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 5, 2026
22
Solamere Capital, LLCStrong evidence
Boston, United StatesHQ checked Sep 5, 202611-5037

“Founded in 2008, Solamere is a multi-strategy private equity firm with offices in Boston and New York City.”

Source: company website · checked Sep 5, 2026
23
Conjoin GroupStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 2026201-50036

“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 5, 2026
24
Riverside PartnersStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5032

“Founded in 1989, Riverside Partners is a Boston-based middle market private equity firm currently investing Riverside Fund VI, L.P.”

Source: company website · checked Sep 5, 2026
25
Union Park CapitalStrong evidence
Boston, MA, United StatesHQ checked Sep 5, 2026n/a31

“Union Park Capital is a private equity investment firm focused solely on lower middle-market Industrial Technology companies.”

Source: company website · checked Sep 5, 2026

Showing 25 of 180 private equity portfolio companies based in Boston, United States

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Private equity portfolio companies based in Boston, United States at a glance

As of Sep 5, 2026
1-10Median size (employees)
New YorkLargest hub · 913 HQs
Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
115
11-50
48
51-200
10
201-500
4
501-1,000
2
1,001-5,000
1

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 180 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 equity portfolio companies, 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 “private equity portfolio companies”. 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 private equity portfolio companies, 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, 4,012 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 5, 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 equity portfolio companies by metro in the United States

Frequently asked

How many private equity portfolio companies are there based in Boston, United States?

RevenueBase identified 180 private equity portfolio companies 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 private equity portfolio companies?

New York leads with 913 headquartered companies, followed by Chicago (289) and San Francisco (230).

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 4,012 verified decision-maker contacts tracked across these 180 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 5, 2026.

Ready to reach these companies? Verified emails and direct dials for all 180 private equity portfolio companies based in Boston, United States. Start with a free account, no credit card.

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Related lists

Browse: Companies home · Private equity portfolio companies in United States · All United States lists · All Private equity portfolio companies lists · New lists

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.

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