A CRO (contract research organization) carries out clinical-research work, trial management, monitoring, and data collection, for a drug or device sponsor, and does not manufacture. A CMO (contract manufacturing organization) manufactures a product that has already been developed. A CDMO (contract development and manufacturing organization) does both development and manufacturing. The three differ by scope of service, not by company size.
CRO, CDMO, and CMO at a glance
| CRO | CDMO | CMO | |
|---|---|---|---|
| Core service | Clinical-research work: trial management, monitoring, data collection | Development (formulation, process development, scale-up) plus manufacturing | Manufacturing and production of an already-developed product |
| Develops or formulates the product? | No | Yes | No |
| Manufactures the product? | No | Yes, preclinical through commercial scale | Yes |
| Holds the marketing application / regulatory responsibility? | No, the sponsor does | No, the sponsor does | No, the sponsor does |
| A sponsor typically needs this when | It needs outside clinical-trial execution capacity | It has no in-house formulation or process-development team, or wants one partner across development and manufacturing | Development is already done and it needs production capacity |
What is a CRO (contract research organization)?
A CRO is an independent organization contracted by a drug or device sponsor to carry out clinical-research obligations on its behalf, including trial management, monitoring, and data collection. A CRO does not manufacture the product it runs trials for; manufacturing is a separate function handled by a CMO or CDMO.
Under FDA regulations (21 CFR 312.3), a sponsor may transfer specific trial-related obligations to a CRO, but that transfer does not shift the sponsor's ultimate regulatory responsibility for the trial. The CRO carries out the delegated work; the sponsor remains accountable for it. For how this shapes CRO-specific go-to-market work, see the GTM playbook for CROs.
What is a CMO (contract manufacturing organization)?
A CMO provides outsourced manufacturing and production services for a drug or device product that has already been developed. Its scope is manufacturing only: it does not perform formulation or process-development work. A sponsor with a finished formulation and an established manufacturing process, needing only production capacity, is a CMO's typical customer.
What is a CDMO (contract development and manufacturing organization)?
A CDMO provides outsourced drug development services, formulation, process development, and scale-up, plus manufacturing, spanning preclinical through commercial scale. A CDMO covers everything a CMO covers, and adds the development work that comes before it.
This is a difference in scope of service, not size: a CDMO is not simply a larger CMO. A biotech with no in-house formulation team needs a CDMO, not just a CMO, regardless of how large or small either company is. For how this shapes CDMO-specific go-to-market work, see the GTM playbook for CDMOs.
The key difference between a CDMO and a CMO
The distinguishing question is not how big a services company is, it is whether it offers development work in addition to manufacturing. A CMO manufactures what a sponsor has already developed. A CDMO does the development work first, then manufactures the result. When evaluating which one a sponsor actually needs, the deciding factor is whether the sponsor already has its own formulation and process-development capability in place.