Series B Funded Biotechnology Startups
The disclosed Series B rounds in this biotechnology slice cluster tightly below $125M, with Osanni Bio at $190M (2026-06-23) as the only deal clearly above…
The disclosed Series B rounds in this biotechnology slice cluster tightly below $125M, with Osanni Bio at $190M (2026-06-23) as the only deal clearly above that ceiling; Windward Bio at $165M (2026-05-04) is the next-largest disclosed amount, and the concentration then continues through multiple $125M-class rounds (SonoThera $125M on 2026-06-10; Ray Therapeutics $125M on 2026-04-21; Diagonal Therapeutics $125M on 2026-01-08). Temporally, the most recent window runs from 2026-07-06 (Kuehnle Agrosystems, undisclosed) back to 2025-11-03 (Enze Kangtai, $14M), and the city pattern leans on hubs repeatedly: Cambridge appears 6 times, while San Diego appears 5 and San Francisco 4 (e.g., City Therapeutics $100M in Cambridge on 2026-06-08; Ray Therapeutics $125M in San Diego on 2026-04-21; Osanni Bio $190M is in Oakland, outside those repeated city counts). Outliers remain visible on both ends of disclosure: the smallest disclosed round is 4baseCare’s $4M (2026-06-11), while four companies are undisclosed across these 50 entries.
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Frequently asked
What does the largest disclosed biotechnology Series B round look like versus the rest of the disclosed set?
Osanni Bio’s $190M (2026-06-23) is the largest disclosed amount and it materially dwarfs the next-largest disclosed round, Windward Bio’s $165M (2026-05-04). The upper band then stacks multiple $125M rounds including SonoThera ($125M on 2026-06-10), Ray Therapeutics ($125M on 2026-04-21), and Diagonal Therapeutics ($125M on 2026-01-08).
Are deals concentrated in a specific geography, or spread out across many cities?
Cambridge is over-represented with 6 appearances in this view (e.g., CREATE Medicines $122M on 2026-05-14; Kytopen undisclosed on 2026-04-07; Triana Biomedicines $120M on 2025-12-03). San Diego also repeats 5 times (e.g., Ray Therapeutics $125M on 2026-04-21; Sidewinder Therapeutics $137M on 2026-04-08), while San Francisco shows 4 entries (e.g., Osanni Bio $190M is in Oakland, but others include SonoThera $125M on 2026-06-10 and Contraline $93M on 2026-06-02 in Charlottesville instead—San Francisco-specific examples include Nura Bio $74M on 2026-06-22).
Which rounds fall closest to the most recent entries in this Series B list?
The newest dated entry is 2026-07-06 (Kuehnle Agrosystems, undisclosed), followed by The Protein Brewery on 2026-06-29 ($21M) and Oblenio Bio on 2026-06-25 ($62M). Several large disclosed rounds are also clustered in June 2026, including Osanni Bio $190M (2026-06-23) and Windward Bio $165M (2026-05-04).
Is there a clear outlier on the low end of disclosed amounts?
Yes. The smallest disclosed Series B amount is 4baseCare’s $4M (2026-06-11). That low-disclosure end contrasts with the concentration around $120M–$190M where the top-ranked disclosed rounds include Osanni Bio $190M (2026-06-23), Windward Bio $165M (2026-05-04), and Triana Biomedicines $120M (2025-12-03).
How often do disclosed amounts go missing in this view, and is that unevenly concentrated near the top or bottom?
Undisclosed amounts appear on 4 of the 50 rows. For example, Kuehnle Agrosystems is undisclosed at 2026-07-06, while AnBogen Therapeutics is undisclosed at 2026-04-13 and Kytopen is undisclosed at 2026-04-07; these undisclosed entries sit alongside both the high-end disclosed deals (e.g., Osanni Bio $190M on 2026-06-23) and the lowest disclosed round (4baseCare $4M on 2026-06-11).
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