We’re different,
in a good way.

About O4 +

Open. Original.
Obsessive. On your side.

Why Choose O4 +

Trusted by the

Explore +

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

We have developed a highly effective infrastructure and methodologies for performing full service observational studies that will surpass your expectations. We are experts in branding studies, increasing engagement and harnessing this positivity with our innovative approaches to deliver exceptional performance.

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On and Off Site Management Support

We create an energy around each study, empowering and motivating site teams to focus on recruitment and retention. We can place our own, fully managed Clinical Research Coordinators on-site, to focus exclusively on your study .

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Clinical Trial Design and Management

We support and guide you to develop and optimise your concept, providing full service clinical trial delivery and early access to our senior team. We use our expertise to simplify the process and make it more efficient and effective for all stakeholders.

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Functional Support

We support our clients at all stages of drug or medical device development and commercialisation. We offer customised services for the specific tasks required to manage and complete the study life cycle. We give you the support you need to deliver high quality research, on time and on budget.

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Trusted by the Trusted

We are working directly with top 20 pharma, biotech and consumer health companies. Here’s what our clients are saying about us.

O4 are very professional, work to a high quality standard and are cost‑competitive. They very successfully re‑invigorated our trial using innovative solutions. Delightful and commendable clinical research partners.

Senior Manager, Dermal Laboratories

O4 is a very engaged partner to work with, responsive to our needs and quick to provide pragmatic thoughtful solutions.

Clinical Research Director, MSD

O4 provide the highest level of professionalism and have continually tailored their work packages to meet our needs.
We have needed a flexible partner. O4 has met this brief and continue to be a perfect fit for our organisation.

Senior Manager, Bayer

Open. Original.
Obsessive. On your side.

Unique values underpin our success,
giving us an unparalleled sector position.

Why Choose O4 +

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.

About O4 +

Get in Touch

When you contact O4, you come in on the top floor, with early access to our senior management team.

Contact +