Company lists · Data refreshed September 2026

Top 25 Early-stage investment firms based in Boston, United States

Name: Early-stage 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 14, 2026 165 companies tracked

RevenueBase identified 165 early-stage investment firms headquartered in Boston, United States as of September 2026 and tracks 2,105 professional contacts across them, including 839 with verified work emails. New York is the largest hub.

This list covers early-stage 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 14, 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 14, 2026 86% judged on-target in blind review

165Companies

2,105Contacts tracked

839Verified emails

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

Ranked by team size

Top 25 of 165 early-stage investment firms based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to early-stage 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	Battery Ventures	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	51-200	211 contacts →
	Indirect evidence “Battery invests in potentially cutting-edge, category-defining businesses in markets including application software, IT infrastructure technologies, consumer-internet and mobile…” Source: RevenueBase Database · checked Sep 14, 2026
2	Third Rock Ventures	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	51-200	113 contacts →
	Indirect evidence “We discover, launch and build great companies based on bold ideas that meet at the intersection of science, strategy, business and medicine – where transformational science meets…” Source: RevenueBase Database · checked Sep 14, 2026
3	FA Technology Ventures	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	n/a	109 contacts →
	Indirect evidence “FA Technology Ventures is an independent, established venture capital firm.” Source: RevenueBase Database · checked Sep 14, 2026
4	Spectrum Equity	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 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 14, 2026
5	Underscore VC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 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 14, 2026
6	Volition Capital	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	63 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 14, 2026
7	Optum Ventures	Indirect evidence	Boston, United StatesHQ checked Sep 14, 2026	11-50	60 contacts →
	Indirect evidence “At Optum Ventures, we look for exceptional teams with data-driven technologies and services that are poised to deeply disrupt the status quo.” Source: RevenueBase Database · checked Sep 14, 2026
8	Clean Energy Ventures	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	54 contacts →
	Indirect evidence “Clean Energy Ventures is a venture capital firm focused on investing in companies commercializing disruptive advanced energy technologies and business model innovations that can…” Source: RevenueBase Database · checked Sep 14, 2026
9	Glasswing Ventures	Strong evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	45 contacts →
	Strong evidence “Glasswing Ventures is an early stage venture capital firm investing in the next generation of AI and frontier technology startups that are enabling the rise of the intelligent…” Source: RevenueBase Database · checked Sep 14, 2026
10	Copley Equity Partners LLC	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 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 14, 2026
11	Companyon Ventures	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	n/a	41 contacts →
	Indirect evidence “We back just a few fast-moving, founder-led B2B startups each year.” Source: RevenueBase Database · checked Sep 14, 2026
12	M33 Growth	Strong evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	38 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 14, 2026
13	PJC	Strong evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	n/a	38 contacts →
	Strong 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 14, 2026
14	Venture Guides	Strong evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	36 contacts →
	Strong evidence “Venture Guides is an early-stage infrastructure software investment firm with a unique team based approach that has resulted in over 80% of portfolio companies generating positive…” Source: RevenueBase Database · checked Sep 14, 2026
15	Mendoza Ventures	Strong evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	n/a	34 contacts →
	Strong evidence “Firm overview Mendoza Ventures is an early-stage and growth venture fund based in Boston.” Source: RevenueBase Database · checked Sep 14, 2026
16	Elephant	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	27 contacts →
	Indirect evidence “Elephant is a venture capital firm focused on investing in fast-growing, capital-efficient technology companies.” Source: RevenueBase Database · checked Sep 14, 2026
17	Raptor Group	Strong evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	27 contacts →
	Strong 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 14, 2026
18	Omega Funds	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	26 contacts →
	Partial evidence “Omega Funds is a leading international investment firm that creates and invests in life sciences companies that target the world’s most urgent medical needs.” Source: RevenueBase Database · checked Sep 14, 2026
19	Fifth Down Capital	Partial evidence	Boston, United StatesHQ checked Sep 14, 2026	11-50	23 contacts →
	Partial evidence “Fifth Down Capital is an investment firm that invests in private companies and funds.” Source: RevenueBase Database · checked Sep 14, 2026
20	Catalyst Health Ventures	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	23 contacts →
	Indirect evidence “CHV (Catalyst Health Ventures) invests in transformative MedTech companies that are addressing global unmet healthcare needs and have the potential to become the new standard of…” Source: RevenueBase Database · checked Sep 14, 2026
21	Polaris Growth Fund	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	21 contacts →
	Partial evidence “Polaris Growth Fund ("PGF") strives to be a collaborative investment partner to companies with these common characteristics-Founder-owned / bootstrapped -Software / tech-enabled…” Source: RevenueBase Database · checked Sep 14, 2026
22	Equal Opportunity Ventures	Strong evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	21 contacts →
	Strong evidence “EO Ventures invests in early-stage businesses that increase opportunity in America.” Source: RevenueBase Database · checked Sep 14, 2026
23	January Ventures	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	21 contacts →
	Indirect evidence “January Ventures is a VC fund focused on angel/pre-seed in the US & Europe.” Source: RevenueBase Database · checked Sep 14, 2026
24	SSC Venture Partners	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	20 contacts →
	Indirect evidence “SSC Venture Partners is a venture capital fund made up of BC alums who love entrepreneurship and want to see BC alumni and students successfully launch their own companies.” Source: RevenueBase Database · checked Sep 14, 2026
25	Massmutual Ventures	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	15 contacts →
	Indirect evidence “Our Culture: At MMV, we’re a team of fair, dedicated investors and operators who put integrity, collaboration, and teamwork at the forefront of what we do.” Source: RevenueBase Database · checked Sep 14, 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: early-stage 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 early-stage investment firms.
Partial evidence: Its own public description names part of early-stage investment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name early-stage 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 165 early-stage investment firms based in Boston, United States

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

As of Sep 14, 2026

39.9%Verified-email coverage

12.8Average contacts per company

1-10Median size (employees)

410.3%Largest-city concentration · New York

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

124

11-50

51-200

201-500

501-1,000

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 165 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 early-stage 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 “early-stage 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 early-stage 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 early-stage 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, 839 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 14, 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.

Early-stage 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 early-stage 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 early-stage investment firms are there based in Boston, United States?

RevenueBase identified 165 early-stage 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?

Battery Ventures, headquartered in Boston, tops this list with the largest team on record.

Which city has the most early-stage investment firms?

New York leads with 677 headquartered companies, followed by San Francisco (579) and Los Angeles (187).

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 839 verified decision-maker contacts tracked across these 165 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 14, 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.