Company lists · Data refreshed September 2026
Top 25 Rare disease drug developers worldwide
RevenueBase identified 869 rare disease drug developers worldwide as of September 2026 and tracks 115,951 professional contacts across them, including 42,222 with verified work emails. The United States is the largest market and London the largest hub.
This list covers rare disease drug developers worldwide, 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 21, 2026. Country and city lists for rare disease drug developers follow the table.
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.
The 25 largest rare disease drug developers worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 26,637 contacts → | ||||
Indirect evidence “At Johnson & Johnson Innovative Medicine, we innovate with purpose, to lead where medicine is going.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 17,217 contacts → | ||||
Indirect evidence “About Genentech We're passionate about finding solutions for people facing the world's most difficult-to-treat conditions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 16,043 contacts → | ||||
Indirect evidence “At Regeneron we believe that when the right idea finds the right team, powerful change is possible.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 6,136 contacts → | ||||
Strong evidence “Alexion, AstraZeneca Rare Disease is focused on pioneering new possibilities for the rare disease community.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 3,943 contacts → | ||||
Indirect evidence “Founded in 1997, BioMarin is a global biotechnology company dedicated to transforming lives through genetic discovery.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 3,644 contacts → | ||||
Strong evidence “Chiesi is a research-oriented international biopharmaceutical group that develops and markets innovative therapeutic solutions in respiratory health, rare diseases, and specialty…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 3,593 contacts → | ||||
Indirect evidence “Jazz Pharmaceuticals plc (Nasdaq: JAZZ), is a global biopharmaceutical company whose purpose is to innovate to transform the lives of patients and their families.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 2,789 contacts → | ||||
Indirect evidence “Recordati has been at the forefront of life-enhancing and life-changing medicines for 100 years.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,556 contacts → | ||||
Indirect evidence “Leading with purpose.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1,512 contacts → | ||||
Partial evidence “Insmed is a people-rst global biopharmaceutical company striving to deliver rst- and best-in-class therapies to transform the lives of patients facing serious diseases.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 1,212 contacts → | ||||
Strong evidence “PTC is a patient-centered biopharmaceutical company focused on discovering, developing & commercializing medicine for children and adults living with rare and serious disease.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 1,054 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 1,043 contacts → | ||||
Indirect evidence “CTI Clinical Trial and Consulting Services is a global, privately held, research service organization, delivering a complete spectrum of clinical trial and consulting services…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 1,019 contacts → | ||||
Indirect evidence “Bial is a family-owned company with a rich history of over 100 years, dedicated to patient welfare, with products available in more than 50 countries.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 976 contacts → | ||||
Strong evidence “Pharming Group is a global biopharmaceutical company dedicated to transforming the lives of patients with rare, debilitating, and life-threatening diseases.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 837 contacts → | ||||
Indirect evidence “We exist to bring transformative medicines to people living with genetic conditions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 657 contacts → | ||||
Partial evidence “Arrowhead Pharmaceuticals is a clinical stage, Nasdaq listed (ticker ARWR) company developing medicines that treat intractable diseases by silencing the genes that cause them.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 625 contacts → | ||||
Indirect evidence “ANI Pharmaceuticals, Inc.(Nasdaq: ANIP) is a diversified biopharmaceutical company committed to its mission of “Serving Patients, Improving Lives" by developing, manufacturing…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 603 contacts → | ||||
Strong evidence “Agios is a commercial-stage biopharmaceutical company dedicated to redefining the future of rare disease treatment.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 582 contacts → | ||||
Strong evidence “PANTHERx Rare makes rare disease care more hyper-personalized and less overwhelming by focusing relentlessly on each patient and each therapy.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 548 contacts → | ||||
Indirect evidence “At AMAG, aiming higher is in our DNA.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 491 contacts → | ||||
Strong evidence “Our mission is to identify, develop and deliver life-changing therapies to people living with rare disease.#InRareForLife Community Guidelines…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 411 contacts → | ||||
Strong evidence “Rhythm Pharmaceuticals is a global, commercial-stage biopharmaceutical company focused on transforming the lives of patients with rare neuroendocrine diseases by rapidly advancing…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 409 contacts → | ||||
Strong evidence “LifeArc® is a self-funded medical research organisation with one clear purpose – transforming the lives of people living with rare diseases and drug-resistant infections.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 395 contacts → | ||||
Indirect evidence “Upsher‑Smith is the commercial arm of the Bora Group, focused on developing, marketing, and distributing pharmaceutical products that make a real difference for patients.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
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: rare disease drug 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 rare disease drug developers.
- Partial evidence
- Its own public description names part of rare disease drug developers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name rare disease drug 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 25 of 869 rare disease drug developers worldwide
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 42,222 reachable decision-makers.
Free signup · no credit card
Rare disease drug developers worldwide at a glance
As of Sep 21, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 rare disease drug 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.
- Coverage
- Every country. Country and city lists for rare disease drug developers are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “rare disease drug 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 rare disease drug 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 rare disease drug developers, and records with no verified work email.
- 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, 42,222 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 21, 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.
Rare disease drug developers by location
4 lists · largest firstEvery Rare disease drug developers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 rare disease drug 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 rare disease drug developers are there worldwide?
RevenueBase identified 869 rare disease drug developers worldwide 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?
Johnson & Johnson Innovative Medicine, headquartered in Titusville, tops this list with the largest team on record.
Which country has the most rare disease drug developers?
The United States leads with 295 companies, followed by India (40) and the United Kingdom (40). Every rare disease drug developers list by country and city is linked on this page.
Which city has the most rare disease drug developers?
London leads with 15 headquartered companies, followed by San Diego (14) and Boston (13).
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 42,222 verified decision-maker contacts tracked across these 869 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 21, 2026.
Ready to reach these companies? Verified emails and direct dials for all 869 rare disease drug developers worldwide. Start with a free account, no credit card.
Download this list →Related lists
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.