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About
Aaron Leibtag and Steven Aviv started Pentavere in Toronto in 2016. The premise, as Leibtag put it on the TechTO stage in June 2018: about 80% of the health information the system creates is never used, because it sits buried in unstructured text — the progress notes physicians write for themselves, dictated transcriptions, and digitized forms. DARWEN reads that text and outputs row-and-column data, with every clinical feature linked back to international ontologies (SNOMED, ICD, MeSH) and drug dose, route and frequency normalized. Rather than sell a product first, the company embedded itself in a hospital and validated the technology through clinical studies at St. Michael's Hospital in partnership with the Biomedical Zone, with pharmaceutical sponsors funding development through research studies — which is how it grew without venture capital. In the 2018 demo Leibtag described an opioid-disorder study across 85,000 records, extracting 76 unique clinical features including socio-economic factors and notations of double-doctoring that never appear in structured EMR fields. Pentavere later won a Prix Galien award and was a finalist in Newsweek's 2025 AI Impact Awards. HEALWELL AI took a majority position in December 2023 and bought the remaining 49% in July 2025 for roughly $14 million. Leibtag remains co-founder and CEO.
Backers
No venture capital. Leibtag funded development through pharmaceutical-sponsored research studies rather than a VC round (Newsweek, July 2025). HEALWELL AI acquired a majority position, completed December 2023, and exercised its call option on the remaining 49% in July 2025, taking full ownership.
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Quick answers
What is DARWEN AI?
Pentavere's engine for reading unstructured health data. It takes clinical text — progress notes, dictation, scanned forms — and produces structured row-and-column data, coding each clinical feature to SNOMED, ICD or MeSH and normalizing drug dose, route and frequency. The point is to surface patients who are eligible for an approved medication or intervention but not receiving it.
Who owns Pentavere?
HEALWELL AI. It completed the acquisition of a majority position in December 2023, then exercised its call option on the remaining 49% in July 2025 for roughly $14 million. Pentavere still operates under its own name and Aaron Leibtag is still co-founder and CEO.
How was the technology validated?
Inside a hospital rather than in a lab. Pentavere ran validation work at St. Michael's Hospital in partnership with the Biomedical Zone, including an opioid-disorder study across 85,000 records that extracted 76 clinical features. The company has since published peer-reviewed results.