Company lists · Data refreshed September 2026

Top 25 Co-investment firms based in Boston, United States

Name: Co-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 27, 2026 148 companies tracked

RevenueBase identified 148 co-investment firms headquartered in Boston, United States as of September 2026 and tracks 6,580 professional contacts across them, including 3,827 with verified work emails. Across the United States, New York is the largest hub for this category (945 companies); Boston has 148.

This list covers co-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 27, 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 27, 2026 86% judged on-target in blind review

148Companies

6,580Contacts tracked

3,827Verified emails

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The 25 largest co-investment firms based in Boston, United States

Ranked by team size

Top 25 of 148 co-investment firms based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to co-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 27, 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 27, 2026
2	Harbourvest Partners	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,353 contacts →
	Indirect 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 27, 2026
3	TA Associates	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 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 27, 2026
4	Arrowstreet Capital, Limited Partnership	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	501-1,000	546 contacts →
	Indirect evidence “Founded in Arrowstreet Capital is an independent private partnership based in Boston, Massachusetts.” Source: RevenueBase Database · checked Sep 27, 2026
5	Charlesbank Capital Partners	Partial evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	51-200	236 contacts →
	Partial 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 27, 2026
6	Spectrum Equity	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 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 27, 2026
7	Highvista Strategies	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	51-200	91 contacts →
	Indirect 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 27, 2026
8	Underscore VC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	75 contacts →
	Indirect evidence “Underscore VC is a Boston-based venture capital firm backing bold B2B software entrepreneurs at pre-Seed and Seed.” Source: RevenueBase Database · checked Sep 27, 2026
9	Parthenon Capital	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 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 27, 2026
10	Monument Group	Partial evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	59 contacts →
	Partial evidence “Monument Group is a leading global independent full-service capital advisory and fundraising partner in alternative investments with offices in the U.S, Europe and Asia.” Source: RevenueBase Database · checked Sep 27, 2026
11	Cove Hill Partners	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	51-200	53 contacts →
	Indirect evidence “Cove Hill Partners is a private equity firm focused on partnering with outstanding management teams to build market-leading technology and consumer companies.” Source: RevenueBase Database · checked Sep 27, 2026
12	Copley Equity Partners LLC	Strong evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	42 contacts →
	Strong evidence “Copley Equity Partners is a private investment firm based in Boston, MA, and Denver, CO.” Source: RevenueBase Database · checked Sep 27, 2026
13	PJC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	n/a	38 contacts →
	Indirect evidence “PJC is an early-stage venture capital firm focused on investing in, supporting, and building relationships with entrepreneurs who are creating the future.” Source: RevenueBase Database · checked Sep 27, 2026
14	Solamere Capital, LLC	Indirect evidence	Boston, United StatesHQ checked Sep 27, 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 27, 2026
15	Conjoin Group	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 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 27, 2026
16	Abrams Capital	Partial evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	32 contacts →
	Partial evidence “Abrams Capital is a Boston-based investment firm founded in by David Abrams.” Source: RevenueBase Database · checked Sep 27, 2026
17	Yellow Wood Partners, LLC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	31 contacts →
	Indirect evidence “Yellow Wood Partners invests exclusively in the consumer industry.” Source: RevenueBase Database · checked Sep 27, 2026
18	Raptor Group	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	27 contacts →
	Indirect evidence “At The Raptor Group, we source and invest in companies across various stages and asset classes, ranging from early stage to both private and public equity to funds.” Source: RevenueBase Database · checked Sep 27, 2026
19	Digital Fuel Capital	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	26 contacts →
	Indirect evidence “We are passionate about digital marketing: the marriage of science and art, the ability to test and innovate rapidly and the opportunities to serve distinct consumer interests and…” Source: RevenueBase Database · checked Sep 27, 2026
20	Ethos Capital	Partial evidence	Boston, United StatesHQ checked Sep 27, 2026	11-50	25 contacts →
	Partial evidence “Ethos Capital is an operations-focused investment firm that partners with information service companies.” Source: RevenueBase Database · checked Sep 27, 2026
21	Glouston Capital Partners	Partial evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	25 contacts →
	Partial evidence “Glouston Capital Partners is a 100% employee-owned private equity investment specialist with more than 30 years of dedicated experience and over $3.4 billion in committed capital…” Source: RevenueBase Database · checked Sep 27, 2026
22	GFI Partners	Partial evidence	Boston, United StatesHQ checked Sep 27, 2026	11-50	25 contacts →
	Partial evidence “GFI Partners is a diversified investment firm specializing in real estate development, private equity, and venture capital.” Source: RevenueBase Database · checked Sep 27, 2026
23	Nonantum Capital Partners	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	24 contacts →
	Indirect evidence “Nonantum Capital Partners is a private equity firm led by a group of experienced private equity and management executives, formed in 2018 as a spin-out from Charlesbank Capital…” Source: RevenueBase Database · checked Sep 27, 2026
24	Atreides Management, LP	Partial evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	24 contacts →
	Partial evidence “Atreides Management, LP is a Boston-based investment manager focused on technology and consumer sectors, managing assets across a range of strategies that invest primarily in…” Source: RevenueBase Database · checked Sep 27, 2026
25	BPEA	Indirect evidence	Boston, MA, United StatesHQ checked Sep 27, 2026	11-50	23 contacts →
	Indirect evidence “Private equity firm located in Boston, MA.” Source: RevenueBase Database · checked Sep 27, 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: co-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 co-investment firms.
Partial evidence: Its own public description names part of co-investment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name co-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 148 co-investment firms based in Boston, United States

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Co-investment firms based in Boston, United States at a glance

As of Sep 27, 2026

58.2%Verified-email coverage

44.5Average contacts per company

1-10Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

103

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 148 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 co-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 “co-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 co-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 co-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, 3,827 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 27, 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.

Co-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 co-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 co-investment firms are there based in Boston, United States?

RevenueBase identified 148 co-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 co-investment firms?

New York leads the United States with 945 headquartered companies, followed by San Francisco (268) and Chicago (250). Boston has 148.

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 3,827 verified decision-maker contacts tracked across these 148 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 27, 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.