We are working directly with top 20 pharma, biotech and consumer health companies. Here’s what our clients are saying about us.
O4 is a CRO built like no other.
Not for the sake of being different.
For the sake of being better.
We are a UK and Ireland based, Clinical Research and Site Management Organisation, providing novel, intelligent Clinical Research Solutions proven to deliver studies like yours, on time and within budget. We focus on concept development, branding, patient recruitment and full service delivery of late phase clinical trials and non-interventional/real-world evidence studies.
Offering peerless flexibility, we also integrate seamlessly with your teams when delivering functional services for global studies or providing bespoke, on and off-site support.
Our Services
Real World Evidence Studies
On and Off Site Management Support
Clinical Trial Design and Management
Functional Support
Trusted by the Trusted
Open. Original.
Obsessive. On your side.
Unique values underpin our success,
giving us an unparalleled sector position.
Partnership with pace and purpose
Our expert project teams deliver creative, collaborative solutions that empower our clients to focus on decision making and strategy. We listen to you carefully, so our study designs and research support solutions are tailored to your unique requirements and engineered to provide optimum efficiency.
Get in Touch
When you contact O4, you come in on the top floor, with early access to our senior management team.