More than a third of the patients your sites screen won't qualify. The average screen-failure rate across trials reached 36.3% (Getz, 2019), and the fix is not more advertising; it's better targeting. That's the job of a clinical trial patient recruitment company: find patients who match your protocol, not patients who click. The right partner shortens your enrollment timeline. The wrong one burns budget on referrals that screen-fail.
Recruitment companies differ on what they do best. Some specialize in a therapeutic area, some run digital advertising, and some add prescreeners, site identification, or patient retention. Below are 15 companies worth evaluating, followed by the questions that separate the right partner from the wrong one.
15 clinical trial patient recruitment companies
- Antidote: Antidote connects sponsors and research sites with informed, engaged patients who want to join a clinical trial. Services include validated referrals, customized outreach plans, and access to a 300+ nonprofit and patient advocacy partner network.
- AutoCruitment: AutoCruitment uses more than 1,500 digital channels to reach patients searching for medical information online, and advertises a three-day setup time.
- BBK Worldwide: With over 30 years in patient recruitment, BBK Worldwide brings deep experience and a large library of whitepapers and ebooks.
- Clariness: In January 2026, Clariness merged with SubjectWell to form one of the largest global recruitment platforms (Clariness, 2026). Its ClinLife patient portal runs in 50+ countries and 35+ languages, and the combined company has delivered 42,000+ randomizations across 400+ indications.
- ClinicalConnection: ClinicalConnection works from a patient database and lists study centers on its site for potential participants to find.
- CSSi: CSSi connects with local patient organizations to find eligible participants as part of its recruitment strategy.
- Curavit: Curavit runs decentralized trials, connecting with patients through telehealth and trial technology platforms.
- Elligo Health Research: Elligo Health Research uses its Elligo Direct approach to make it simple for physicians and their patients to take part in clinical trials.
- Langland: Langland is an advertising agency with clinical trial marketing expertise, blending patient, protocol, disease, and media insights with data and technology for recruitment and retention.
- MMG: MMG brings several decades of experience and positions itself as a team of global recruitment strategists focused on strategy support.
- Praxis: Praxis lets sponsors pick the services they need, from digital advertising to community outreach.
- Science 37: Science 37 runs decentralized, site-less trials through its Metasite model. It became part of telehealth and diagnostics company eMed in 2024 (Science 37, 2024).
- StudyKIK: StudyKIK recruits through Facebook and other social platforms, where patients sign up and get notified when a matching trial opens.
- Trialbee: Trialbee is a global, technology-driven recruitment company. Its vendor-agnostic Honey Platform centralizes recruitment activity across every source and channel, and in 2026 it added AI-powered patient matching (Trialbee, 2026).
- TrialX: Alongside recruitment services, TrialX builds mobile apps for trials.
How to choose a clinical trial recruitment company
The right partner depends on your protocol, budget, and timeline. These questions surface the differences that matter. You can also work through the full list of 15 questions to ask a recruitment company.
- Do you need help choosing trial sites? If site locations aren't set, some companies use data from past trials to pick locations and flag the ones that prove hard to recruit in.
- Do you need proactive support or rescue recruitment? If enrollment has already stalled, choose a company built for speed. If you're planning ahead, choose one that offers strategy across the full trial.
- What budget model fits your trial? Options range from pay-for-performance to a flat fee. Decide how you want to structure payments before you talk to vendors.
- Does the company have an in-house marketing team? An internal team produces ads that stand out in crowded feeds. Ask how they build materials and to see campaigns they've run.
- Does the company know your therapeutic area? A company that has recruited in your space already knows what works there. Ask for case studies with results.
- Does it specialize in your trial phase? Some companies excel with healthy Phase 1 volunteers, others with Phase 4 observational work. Match the company to your phase.
- Has it run international trials? For multi-country sites, look for experience with translated materials and non-US outreach.
- How does it handle ineligible patients? Some keep a database and can match those patients to other trials in your portfolio, so no interested patient is lost.
- What's the lead time to build materials and a strategy? If you're on a deadline, recruitment speed matters. Ask how fast they can start.
- How are patients screened? Some companies build and host a custom prescreener and run phone screening. Decide whether you need that.
- How does it handle weak results? Ask how the company adjusts strategy when recruitment falls behind, because roadblocks are common.
- Do you need retention too? Some companies offer engagement programs, data-collection tools, and site follow-up to keep patients enrolled after you hit your goal.
- What reporting will you get? Ask how often they share recruitment metrics, and request a sample report.
- What's the company's relationship with patients? Patient centricity starts at design. Look for clear, readable patient materials, and ask what feedback patients have given.
- What diversity efforts are built in? Trials should reflect the population. Ask how the company approaches diversity, especially if your condition hits one group harder.
- How does it find patients? Vendors use different methods, listed below. For a rare disease, a company with condition-specific partnerships may reach the right patients faster.
Clinical trial recruitment challenges (and how to solve them)
Challenge: You're getting referrals for patients who aren't eligible.
Solution: Diversify your recruitment approach and tighten prescreening.
The average screen-failure rate across trials reached 36.3%, so more than a third of screened patients never qualify (Getz, 2019). Inaccurate patient data or competition from nearby trials can push that higher, even with a strong site-selection process. Diversifying outreach and prescreening earlier keeps your timeline on track.
Challenge: Your research sites are underperforming.
Solution: Work with a company that has specific, accurate patient data.
Trials keep getting more complex, and many now require specific lab values or markers patients don't know on their own, which raises screen-failure rates. A company with data beyond diagnosis, covering medications, recent bloodwork, and key markers, can flag likely-eligible patients. Antidote's lab-validated referrals add this layer through direct-to-patient lab partnerships.
Challenge: Patients go quiet before they reach your sites.
Solution: Add patient and site follow-up.
Missed messages and screening delays lose interested patients between first contact and randomization. Site teams are already stretched, so follow-up slips. A recruitment partner can run automated follow-ups and rescheduling that move patients forward and cut site time.
Challenge: The patients you find live too far from your sites.
Solution: Offer travel support and adjust targeting.
Visit frequency and symptom burden shape how far patients will travel. If patients live too far out, ask the site or recruitment company to tighten the targeting radius, and consider travel services or reimbursement to keep distant patients engaged.
Challenge: Interest stays low even after outreach.
Solution: Work with a company experienced in your condition.
Patient motivation varies by condition. In an Antidote patient survey, asthma and allergy patients rated payment as a strong factor in deciding to participate. If outreach isn't landing, the messaging may not match what your patients care about. A company with range across conditions builds outreach that resonates.
What recruitment strategies do agencies use?
Finding the right patients usually takes several strategies at once. Most companies combine:
- Digital advertising: Google Ads, Facebook, and other social platforms let recruiters target people by interest and by clinical-trial searches. Website placements reach users based on the pages they visit.
- Traditional advertising: Radio, billboards, and print materials in doctors' offices still reach patients who aren't online.
- Patient databases and registries: Some companies keep a database of interested patients and alert them to local trials, which widens reach and often lowers cost-per-patient versus starting from scratch.
- Partnerships: Ties with nonprofits and community groups reach motivated, qualified patients, especially when those partners hold large email lists.
- Electronic health record (EHR) matching: Health-record mining flags patients whose lab tests and treatments suggest eligibility, and lets physicians alert their own patients, a trusted source that lifts interest.
- Community events: Partners attend local health fairs and promote trials with flyers and other materials.
See how Antidote helps sponsors qualify patients before they reach a site.