Company lists · Data refreshed September 2026

Top 23 Custom synthesis companies based in France

Name: Custom synthesis companies based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 59 companies tracked

RevenueBase identified 59 custom synthesis companies headquartered in France as of September 2026 and tracks 2,132 professional contacts across them, including 825 with verified work emails. Lyon is the largest hub.

This list covers custom synthesis companies headquartered in France, 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 19, 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 19, 2026 86% judged on-target in blind review

59Companies

2,132Contacts tracked

825Verified emails

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The 23 largest custom synthesis companies based in France

Ranked by team size

Top 23 of 59 custom synthesis companies based in France, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to custom synthesis companies: 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	Novasep	Indirect evidence	Lyon, FranceHQ checked Sep 19, 2026	1,001-5,000	396 contacts →
	Indirect evidence “Novasep is a leading provider of services in the field of molecule production and purification for the life science industries, based on an unrivalled pool of specialized and…” Source: RevenueBase Database · checked Sep 19, 2026
2	Minakem	Partial evidence	Minakem, FranceHQ checked Sep 19, 2026	501-1,000	275 contacts →
	Partial evidence “MINAKEM is a fully integrated development partner and commercial manufacturer for pharmaceutical companies- API manufacturing (Innovators/Generics and Highly Potent)- Custom…” Source: RevenueBase Database · checked Sep 19, 2026
3	PMC Isochem	Partial evidence	Vert-le-petit, FranceHQ checked Sep 19, 2026	201-500	144 contacts →
	Partial evidence “PMC Isochem, part of PMC Group International, is a world leader in custom pharmaceutical manufacturing and polymer excipients offering- CDMO for APIs, Intermediates and Excipient…” Source: RevenueBase Database · checked Sep 19, 2026
4	Galien	Indirect evidence	Levallois-perret, FranceHQ checked Sep 19, 2026	501-1,000	131 contacts →
	Indirect evidence “Galien is a CDMO Pharmaceuticals company located in Burgundy, France.” Source: RevenueBase Database · checked Sep 19, 2026
5	Seqens Custom And Specialties	Partial evidence	Écully, FranceHQ checked Sep 19, 2026	1,001-5,000	122 contacts →
	Partial evidence “SEQENS Custom & Specialties is one of Europe’s largest contract manufacturers, combining the speed and agility of a small/medium sized company with the health and safety and…” Source: RevenueBase Database · checked Sep 19, 2026
6	Interor	Indirect evidence	Calais, FranceHQ checked Sep 19, 2026	51-200	97 contacts →
	Indirect evidence “INTEROR SA is a chemicals company based out of Calais, Nord-Pas-de-Calais, France.” Source: RevenueBase Database · checked Sep 19, 2026
7	Seqens Pharmaceutical Solutions	Partial evidence	Écully, FranceHQ checked Sep 19, 2026	1,001-5,000	95 contacts →
	Partial evidence “Mastering a wide range of technologies, Seqens provide their clients with custom manufacturing services as well as a broad portfolio of Active Pharmaceutical Ingredients (APIs) &…” Source: RevenueBase Database · checked Sep 19, 2026
8	Edelris	Partial evidence	Lyon, FranceHQ checked Sep 19, 2026	51-200	66 contacts →
	Partial evidence “EDELRIS is a pioneering company dedicated to the design and chemical synthesis of innovative natural product-like screening Libraries, medicinal chemistry Hit-to-Lead / Lead…” Source: RevenueBase Database · checked Sep 19, 2026
9	Fareva LA Vallee	Indirect evidence	St Germain Laprade, FranceHQ checked Sep 19, 2026	201-500	64 contacts →
	Indirect evidence “FAREVA LA VALLEE is a chemical company based out of ZONE INDUSTRIELLE DE BLAVOZY 928 AV ANTOINE LAURENT DE LAVOISIER, ST GERMAIN LAPRADE, France.” Source: RevenueBase Database · checked Sep 19, 2026
10	LA Mesta Chimie Fine	Partial evidence	Gilette, FranceHQ checked Sep 19, 2026	51-200	53 contacts →
	Partial evidence “Established in South of France in 1971, La Mesta Chimie Fine is a technology driven Custom Manufacturing Organization.” Source: RevenueBase Database · checked Sep 19, 2026
11	Diverchim Cdmo	Indirect evidence	Roissy-en-france, FranceHQ checked Sep 19, 2026	11-50	51 contacts →
	Indirect evidence “Founded in Diverchim is a Small Molecule Drug Substance CDMO that specializes in complex chemistry.” Source: RevenueBase Database · checked Sep 19, 2026
12	Isochem SAS	Indirect evidence	Vert Le Petit, FranceHQ checked Sep 19, 2026	201-500	47 contacts →
	Indirect evidence “Founded in 1974, ISOCHEM is a contract manufacturer and one of the world’s leading suppliers of fine chemicals and active pharmaceutical ingredients.” Source: RevenueBase Database · checked Sep 19, 2026
13	Alsachim SAS	Partial evidence	FranceHQ checked Sep 19, 2026	51-200	40 contacts →
	Partial evidence “Created in 2005, Alsachim is one of the world leaders in the synthesis of stable labeled (13C, 2H, 15N) internal standards, used in Bioanalysis studies, chemicals, building blocks…” Source: RevenueBase Database · checked Sep 19, 2026
14	Orrion Chemicals Orgaform	Indirect evidence	Semoy, FranceHQ checked Sep 19, 2026	11-50	30 contacts →
	Indirect evidence “With over 50 years’ experience in the formulation chemistry, OCO aims to be a leader in each of the businesses it serves.” Source: RevenueBase Database · checked Sep 19, 2026
15	Norchim	Indirect evidence	St Leu D Esserent, FranceHQ checked Sep 19, 2026	11-50	25 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
16	Palchem	Indirect evidence	Angres, FranceHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “Située à 200 km au nord de Paris, PALCHEM est une société indépendante qui propose ses services de chimie fine et de synthèse à façon dans des délais très courts.” Source: RevenueBase Database · checked Sep 19, 2026
17	Oxeltis	Indirect evidence	Montpellier Cedex 4, FranceHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “OXELTIS is an independent medchem oriented service company managed by former researchers from Idenix Pharmaceuticals and located in Montpellier - France.” Source: RevenueBase Database · checked Sep 19, 2026
18	Cortecnet	Indirect evidence	Les Ulis, FranceHQ checked Sep 19, 2026	11-50	18 contacts →
	Indirect evidence “Thanks to constant innovation over the years, CortecNet has become recognized world-wide as a stable-isotopes driven company able to supply any type of uniformly or selectively…” Source: RevenueBase Database · checked Sep 19, 2026
19	Genepep - Peptide	Indirect evidence	Saint Jean De Vedas, FranceHQ checked Sep 19, 2026	1-10	14 contacts →
	Indirect evidence “PEPTIDES, PEPTIDE LIBRARIES AND PROTEINS Innovative chemistry for therapeutic, diagnostic and cosmetic applications GENEPEP is a CRO company (with CIR agreement) focused on…” Source: RevenueBase Database · checked Sep 19, 2026
20	Atlanchim Pharma	Strong evidence	Saint-herblain Cedex, FranceHQ checked Sep 19, 2026	11-50	8 contacts →
	Strong evidence “ATLANCHIM PHARMA is a chemistry-based CRO (Contract Research Organization) conducting confidential custom synthesis of complex molecules tailored to customer specifications.” Source: RevenueBase Database · checked Sep 19, 2026
21	Rtmolecule	Strong evidence	Poitiers, FranceHQ checked Sep 19, 2026	1-10	4 contacts →
	Strong evidence “Founded at Poitiers (France) in 2003,@rtMolecule is a private incorporated company.@rtMolecule specializes in custom synthesis of organic molecules and provides the following…” Source: RevenueBase Database · checked Sep 19, 2026
22	Novecal	Partial evidence	Orsay, FranceHQ checked Sep 19, 2026	1-10	3 contacts →
	Partial evidence “NOVECAL proposes R&D&I services in various fields of chemistry- Organic chemistry: synthesis, purification, analysis and characterization- Catalysis: screening and optimization…” Source: RevenueBase Database · checked Sep 19, 2026
23	R&h Discovery	Indirect evidence	Grabels, FranceHQ checked Sep 19, 2026	1-10	1 contacts →
	Indirect evidence “R&H Discovery est un laboratoire pharmaceutique proposant son expertise en synthèse et découverte de nouvelles molécules candidats médicaments.” Source: RevenueBase Database · checked Sep 19, 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: custom synthesis companies. 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 custom synthesis companies.
Partial evidence: Its own public description names part of custom synthesis companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom synthesis companies. 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 59 custom synthesis companies based in France

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Custom synthesis companies based in France at a glance

As of Sep 19, 2026

38.7%Verified-email coverage

36.1Average contacts per company

11-50Median size (employees)

5.1%Largest-city concentration · Lyon

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for France, so it is reported there. Company counts and contact totals on this page are exact for France, over 59 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 custom synthesis companies, 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 France whose own description of what they do matches “custom synthesis companies”. 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 custom synthesis companies), 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 custom synthesis companies, and records with no verified work email. Companies headquartered outside France 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, 825 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 19, 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.

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 custom synthesis companies, 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 custom synthesis companies are there based in France?

RevenueBase identified 59 custom synthesis companies headquartered in France 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?

Novasep, headquartered in Lyon, tops this list with the largest team on record.

Which city has the most custom synthesis companies?

Lyon leads with 3 headquartered companies, followed by Paris (3) and Ecully (2).

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 825 verified decision-maker contacts tracked across these 59 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 19, 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.