12 Patient Recruitment Companies Operating in the United States in 2026

The United States remains the largest single market for clinical trial patient recruitment, with a mix of digital platforms, physician networks, call centers, and site organizations all competing to get qualified participants in front of trial teams. A patient recruitment provider based in the U.S. deals with a fragmented healthcare system, state-by-state variation in how patients access care, and a research infrastructure spread across thousands of independent sites — conditions that have shaped a wide range of recruitment models. For Sponsors and CROs running U.S.-based or U.S.-inclusive studies, understanding which trial recruitment service fits a given protocol's population and geography can shorten the path from study start-up to first patient enrolled.

The companies below, presented in no particular order, are all based in the United States and support recruitment and retention there. Between them they cover digital advertising and AI-driven EHR matching, physician- and nurse-led outreach, investigator site networks, and participant-support technology that manages payments, travel, and communication once someone has enrolled.

ClinicalConnection

Established in 1998, ClinicalConnection maintains a searchable database of clinical trials that the company states reaches a membership of more than one million people actively seeking trial participation. When a research site, sponsor, or CRO posts a study, it becomes visible to that user base, and the company layers on targeted email and SMS campaigns to reach people who match a trial's criteria. Headquartered in Needham, Massachusetts, ClinicalConnection also offers digital marketing and web development support to research sites.

OneStudyTeam

A member of the Reify Health portfolio, OneStudyTeam provides the cloud-based StudyTeam platform that brings research site recruitment and enrollment workflows online for sites, sponsors, and other trial stakeholders. The company states the platform is used across more than 10,000 research sites in over 100 countries, giving sponsors visibility into recruitment activity across channels while helping site staff pre-screen and enroll patients. Based in Boston, Massachusetts, OneStudyTeam also operates alongside Care Access, a fellow Reify Health business focused on decentralized trial delivery.

Elite Research Network

Rather than recruiting patients directly, Elite Research Network coordinates a group of investigative sites across the United States, centralizing business development, feasibility, and study start-up on their behalf. The company states its use of a central IRB and dedicated regulatory specialists keeps start-up regulatory document turnaround to five days or less at member sites, and it offers these services to sponsors and CROs at no direct cost, since it draws support from the investigator sites in its network instead. Founded in 2004, Elite Research Network is based in Mount Pleasant, South Carolina.

Mural Health Technologies

Mural Health's Mural Link platform focuses on the participant side of a clinical trial, managing payments, travel coordination, and site communication after someone has enrolled. The company states it invented the ClinCard, an early participant payment technology, in 2008, and Mural Link now offers more than ten fee-free payment methods along with cross-border payment options for global studies. Based in Berwyn, Pennsylvania and founded in 2021, Mural Health works with CROs including ICON on its participant management and payments technology.

TrialWire

Built on Salesforce Health Cloud, TrialWire uses AI and algorithms to identify people who are actively searching online for information related to their condition and connect them with relevant studies. The company states it can begin recruitment efforts within 24 hours of a study going live and operates on a pay-per-enrolled-patient model, with study dashboards that give sponsors, CROs, and site coordinators real-time, role-based visibility into referral and screening progress. Founded in 2001, TrialWire is based in San Francisco, California, and describes its RapidRescue offering as built specifically to support stalled trials.

Ripple Science

Now operating under the name EnrollNow, Ripple Science provides a HIPAA-compliant software platform that sites, CROs, and sponsors use to manage patient engagement from first contact through study completion. The company states its platform has supported more than 700 clinical trials involving over 240,000 participants across six countries, and it has been adopted by academic research centers including Johns Hopkins University and the University of Michigan. Founded in 2016, the company is based in Ann Arbor, Michigan.

Praxis Communications

Praxis Communications operates as the patient recruitment division of Crowley Webb, a Buffalo, New York advertising agency with more than three decades of marketing experience, and channels that agency background into recruitment campaign creative and data analytics. The company states it has run thousands of recruitment campaigns since opening in 2002, drawing on therapeutic-area experience and historical program data to build targeted outreach for each study. Praxis is based in Buffalo, New York.

Effectus Clinical Trial Recruitment

Effectus Clinical Trial Recruitment recruits through a network of contracted treating physicians, who identify and pre-screen their own patients for a study before Effectus coordinates the handoff to a trial site. The company states this health-care-provider-based approach draws on more than 20 years of recruitment experience, and it separately maintains a network of principal investigators for sponsors evaluating site selection. Effectus is now based in Nashville, Tennessee.

BEKHealth

BEKHealth's AI-powered platform reads both structured and unstructured data from electronic medical records to identify patients who meet a study's inclusion and exclusion criteria, an approach the company states captures more trial-relevant detail than structured EMR fields alone. The company states its BEKnetwork spans more than 30 million patients across roughly 200 research sites, giving sponsors and site networks a way to check feasibility against real patient populations before committing to a protocol. Founded in 2020, BEKHealth is based in Kent, Connecticut.

CenExel Clinical Research

CenExel operates a nationwide network of Centers of Excellence — company-owned research sites organized around specific therapeutic focuses such as psychiatry, neurology, pain, and vaccines. The company states the network has grown to 18 Centers of Excellence, each staffed by its own principal investigators and research teams, giving sponsors a single point of contact across multiple U.S. metro areas. Founded in 2018 and based in Atlanta, Georgia, CenExel has grown in part through acquiring independent research sites and folding them into its network.

Serva Health

Serva Health staffs its patient engagement work with registered nurses rather than general call-center agents, running its nurse-led outreach through the company's own ServaCore technology platform. The company states ServaCore is a SOC 2 Type II–audited system built in-house, combining CRM, telephony, and real-time reporting tools that track a patient's status from first outreach through site referral. Founded in 2009, Serva Health is based in Mount Laurel Township, New Jersey.

Vibrent Health

Since 2017, Vibrent Health has served as the Participant Technology Systems Center for the NIH's All of Us Research Program, building the recruitment, consent, and engagement technology behind a research effort that the company states has enrolled more than 356,000 participants to date. Its Digital Health Solutions Platform extends the same recruitment and engagement tools to other academic centers, life sciences companies, and public health registries. Founded in 2012, Vibrent Health is based in Fairfax, Virginia.

Explore the full Patient Recruitment landscape

The companies above represent a portion of a much larger field.

Diligent's platform includes over 730 Patient Recruitment Vendors, many with Vendor qualification data available on demand. Book a demo to explore Diligent's full vendor discovery database.

This article is intended as an informational overview of vendors operating in this space. Inclusion on this list does not constitute an endorsement, recommendation, or qualification by Diligent.