Company lists · Data refreshed September 2026

Top 23 Immunotherapy developers based in Waltham, United States

Name: Immunotherapy developers based in Waltham, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 26 companies tracked

RevenueBase identified 26 immunotherapy developers headquartered in Waltham, United States as of September 2026 and tracks 1,611 professional contacts across them, including 1,141 with verified work emails. San Diego is the largest hub.

This list covers immunotherapy developers headquartered in Waltham, 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 20, 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 20, 2026 86% judged on-target in blind review

26Companies

1,611Contacts tracked

1,141Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 23 largest immunotherapy developers based in Waltham, United States

Ranked by team size

Top 23 of 26 immunotherapy developers based in Waltham, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to immunotherapy developers: 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	Viridian Therapeutics, INC	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	201-500	282 contacts →
	Indirect evidence “Viridian is a biopharmaceutical company focused on engineering and developing potential best-in-class medicines for patients with serious and rare diseases.” Source: RevenueBase Database · checked Sep 20, 2026
2	Tscan Therapeutics	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	190 contacts →
	Indirect evidence “TScan is dedicated to creating life-changing T cell therapies for patients by unleashing the untapped potential of the human immune system.” Source: RevenueBase Database · checked Sep 20, 2026
3	Zenas Biopharma	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	159 contacts →
	Indirect evidence “Zenas is a clinical-stage global biopharmaceutical company committed to becoming a leader in the development and commercialization of transformative therapies for patients living…” Source: RevenueBase Database · checked Sep 20, 2026
4	Visterra INC	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	146 contacts →
	Indirect evidence “Visterra is a clinical stage biotechnology company committed to developing innovative antibody-based therapies for the treatment of patients with kidney diseases and other…” Source: RevenueBase Database · checked Sep 20, 2026
5	Spyre Therapeutics	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	96 contacts →
	Indirect evidence “Spyre Therapeutics is a clinical-stage biotechnology company that aims to create next-generation inflammatory bowel disease (IBD) and other immune-mediated disease products by…” Source: RevenueBase Database · checked Sep 20, 2026
6	Dragonfly Therapeutics, INC	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	95 contacts →
	Indirect evidence “Dragonfly Therapeutics is a clinical-stage biopharmaceutical company committed to discovering, developing and commercializing therapies that use its novel multispecific antibody…” Source: RevenueBase Database · checked Sep 20, 2026
7	Xilio Therapeutics, INC	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	89 contacts →
	Indirect evidence “Xilio is a Waltham, Massachusetts-based clinical-stage biopharmaceutical company focused on defeating cancer.” Source: RevenueBase Database · checked Sep 20, 2026
8	Upstream BIO	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	62 contacts →
	Indirect evidence “We are advancing verekitug, a clinical-stage monoclonal antibody targeting an upstream driver of inflammatory response.” Source: RevenueBase Database · checked Sep 20, 2026
9	Mural Oncology	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	57 contacts →
	Indirect evidence “We know that drug development is both an art and a science.” Source: RevenueBase Database · checked Sep 20, 2026
10	Paragon Therapeutics, INC	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	53 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
11	Mustang BIO	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	n/a	52 contacts →
	Indirect evidence “Mustang Bio, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
12	Orionis Biosciences	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	50 contacts →
	Indirect evidence “Orionis Biosciences is a life sciences company pioneering technological innovation in genome-scale drug discovery and tunable molecular design of novel therapeutic drug modalities.” Source: RevenueBase Database · checked Sep 20, 2026
13	Crescent Biopharma	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	48 contacts →
	Indirect evidence “Crescent Biopharma’s vision is to build a world leading oncology company bringing the next wave of therapies for cancer patients.” Source: RevenueBase Database · checked Sep 20, 2026
14	Mythic Therapeutics, INC	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	39 contacts →
	Indirect evidence “Mythic Therapeutics is a product-platform company that is pioneering a powerful new approach to improving the effectiveness of antibody-drug conjugates (ADCs) and other…” Source: RevenueBase Database · checked Sep 20, 2026
15	Dynamicure Biotechnology	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	29 contacts →
	Indirect evidence “Driven by science and passionate about advancing patient care, DynamiCure is translating breakthrough insights on immuno-normalization into a pipeline of innovative antibody…” Source: RevenueBase Database · checked Sep 20, 2026
16	Allovir	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	51-200	29 contacts →
	Indirect evidence “AlloVir, formerly ViraCyte, was founded in 2013 and is the leader in the development of novel cell therapies with a focus on restoring natural immunity against life-threatening…” Source: RevenueBase Database · checked Sep 20, 2026
17	Immunitas Therapeutics	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	29 contacts →
	Indirect evidence “Immunitas is committed to discovering and developing novel, differentiated therapeutics for patients with cancer and autoimmune diseases.” Source: RevenueBase Database · checked Sep 20, 2026
18	Q32 BIO INC	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	27 contacts →
	Indirect evidence “Q32 Bio is a clinical stage biotechnology company whose science targets potent regulators of the adaptive immune system to re-balance immunity and is focused on developing…” Source: RevenueBase Database · checked Sep 20, 2026
19	Palleon Pharmaceuticals	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Palleon Pharmaceuticals is the leading biotechnology company focused on developing Glyco-Immune Checkpoint inhibitors to treat cancer.” Source: RevenueBase Database · checked Sep 20, 2026
20	Checkpoint Therapeutics INC	Partial evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	17 contacts →
	Partial evidence “Checkpoint Therapeutics is revolutionizing the way novel treatments for cancer patients are developed.” Source: RevenueBase Database · checked Sep 20, 2026
21	Cugene INC	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “Cugene is a clinical-stage biotechnology company focused on developing next-generation precision immunology and oncology medicines that harness specific immune cells to treat…” Source: RevenueBase Database · checked Sep 20, 2026
22	Minerva Biotechnologies	Partial evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	14 contacts →
	Partial evidence “Minerva Biotechnologies is a clinical stage biopharmaceutical company focused on developing immunotherapies for solid tumor cancers and cellular therapies for regenerative…” Source: RevenueBase Database · checked Sep 20, 2026
23	Immuneid	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 20, 2026	11-50	5 contacts →
	Indirect evidence “Enabling precision immunology” Source: RevenueBase Database · checked Sep 20, 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: immunotherapy developers. 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 immunotherapy developers.
Partial evidence: Its own public description names part of immunotherapy developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name immunotherapy developers. 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 23 of 26 immunotherapy developers based in Waltham, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,141 reachable decision-makers.

Free signup · no credit card

View the full list →

Immunotherapy developers based in Waltham, United States at a glance

As of Sep 20, 2026

70.8%Verified-email coverage

62.0Average contacts per company

11-50Median size (employees)

492.3%Largest-city concentration · San Diego

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than for Waltham, so it is reported there. Company counts and contact totals on this page are exact for Waltham, over 26 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 immunotherapy developers, 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 Waltham, United States whose own description of what they do matches “immunotherapy developers”. 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 immunotherapy developers), 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 immunotherapy developers, and records with no verified work email. Companies headquartered outside Waltham 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, 1,141 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 20, 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.

Immunotherapy developers by metro in the United States

Immunotherapy developers in San Diego128
Immunotherapy developers in Cambridge117
Immunotherapy developers in Boston80
Immunotherapy developers in New York66
Immunotherapy developers in South San Francisco56
Immunotherapy developers in San Francisco49
Immunotherapy developers in Seattle44
Immunotherapy developers in Houston41
Immunotherapy developers in Los Angeles32
Immunotherapy developers in Philadelphia32
Immunotherapy developers in Waltham26

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 immunotherapy developers, 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 immunotherapy developers are there based in Waltham, United States?

RevenueBase identified 26 immunotherapy developers headquartered in Waltham, 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?

Viridian Therapeutics, INC, headquartered in Waltham, tops this list with the largest team on record.

Which city has the most immunotherapy developers?

San Diego leads with 128 headquartered companies, followed by Cambridge (117) and Boston (80).

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 1,141 verified decision-maker contacts tracked across these 26 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 20, 2026.

Ready to reach these companies? Verified emails and direct dials for all 26 immunotherapy developers based in Waltham, United States. Start with a free account, no credit card.

Download this list →

Related lists

Immunotherapy developers by geography

Browse the directory

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.