The research landscape.
The busiest research sites in the United States are academic medical centers and cancer institutes; not pharmaceutical companies. These institutions run the trials, enroll the patients, and generate the evidence.
The twenty institutions below currently host the most trials actively recruiting at a U.S. site. Together they form the landscape our tools are built for: large hospital systems with deep pipelines, where sponsor teams, coordinators, and reviewers need a shared, governed record of the work.
Ranked by the number of trials actively recruiting at a US site, per whichtrial.com (ClinicalTrials.gov lead-sponsor data), checked September 2026. Counts change as trials open and close, so only the ranking is shown. Pharmaceutical sponsors and the VA research network are excluded; the remaining twenty institutions are ranked on the same metric.
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