Estuary Bio
Estuary Biotherapeutics, Inc.
Estuary Bio is a kidney company working to end autosomal dominant polycystic kidney disease.
estuarybio.com · Menlo Park, CA
Funding event
The round itself, as filedInferred stageSeries B
Sold of offered$40.7M of $104M
Filed2026-10-16
Days since filing2
- Exemption claimed
- Rule 506(b)
- First-ever Form D
- Yes
- Date of first sale
- 2026-07-01
Investors
No investors named: Form D does not list them
Officers on the filing
Names and roles as filed; addresses are never stored- Wayne E. SackettExecutive Officer · Director
- Jacob BauerDirector
- Owen SmithDirector
- Emily MinkowDirector
Health flags
Three flags, each with the raw inputs behind it · as of 2026-10-17UndersubscribedFlagged39.2% sold3.5 months since first sale
Prior raiseNot flaggedPrior raise not known—
AmendedNot flaggedNo amendmentNo D/A on file
Open roles
On the employer's own careers page · checked 2026-10-170
Pre-posting windowNot enough dataShown once this sector and stage have 20 observed lags from filing to first posting.
No open roles foundWe read careers pages daily.
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