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Estuary Biotherapeutics Attains $103M Series A

Reported by Vcnewsdaily
Oct 19, 2026· 2 min read
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Key Takeaways
  • • Estuary Biotherapeutics launched with $103 million in total committed financing, including a $93 million Series A led by RA Capital Management.
  • • The Series A drew participation from Deep Track Capital, Biogen New Ventures, UPMC Enterprises, Pivotal bioVenture Partners, the National Kidney Foundation Innovation Fund, and a family office connected to an individual living with autosomal dominant polycystic kidney disease (ADPKD).
  • • 4BIO Capital and GV, which co-led the company's $10 million seed round, also participated in the Series A.
  • • Estuary is developing genetic medicines for patients with serious kidney diseases, based in Menlo Park, California.
Summary
Estuary Biotherapeutics, a biotechnology company developing genetic medicines for patients with serious kidney diseases, announced its launch with $103 million in total committed financing, according to the company's announcement. The package consists of a $93 million Series A round and the earlier $10 million seed financing.

The Series A was led by RA Capital Management. Participants included Deep Track Capital, Biogen New Ventures, UPMC Enterprises, Pivotal bioVenture Partners, the National Kidney Foundation Innovation Fund, and a family office connected to an individual living with autosomal dominant polycystic kidney disease (ADPKD). Seed co-leads 4BIO Capital and GV also joined the Series A.

The mix of specialist life-sciences investors, a corporate venture arm, a patient-advocacy foundation fund, and a family office with a direct ADPKD connection reflects the company's focus on hereditary kidney disease. The company is based in Menlo Park, California.

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Sources

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Vcnewsdaily Estuary Biotherapeutics Attains $103M Series A