Monthly roundup · Biotech · September 2026
Biotech startup funding, September 2026: Biossil's $153M Series B leads 27 rounds
We read 27 equity rounds in Biotech announced in September 2026, raising $816M between them: 8% of all the rounds we read that month and 2% of the money. The largest was Biossil's $153M Series B, led by OpenAI Startup Fund. The median seed round was $4.0M, against $6.7M over the last twelve months in Biotech; at Series A it was $20M. 4BIO Capital led the most rounds, with 2.
The biggest rounds
- 1
BiossilSeries B · Canada · led by OpenAI Startup Fund$153M - 2
Basecamp ResearchSeries C · United Kingdom · led by S32$140M - 3
BigHat BiosciencesSeries C · United States$75M - 4
OMass TherapeuticsSeries C · United Kingdom$53M - 5CCaspian TherapeuticsSeries A · led by BVF Partners$50M
- 6
Aptadir TherapeuticsSeed · United Kingdom · led by 4BIO Capital$46M - 7
EvvySeries B · United States · led by Catalio Capital Management$40M - 8
MicrobioticaSeries C · United Kingdom · led by British Business Bank$35M - 9
Kasvu TherapeuticsSeries A · Finland · led by Hadean Ventures$34M - 10
Cloverleaf BioSeed · led by 4BIO Capital$33M
Canada · led by OpenAI Startup Fund
United Kingdom · led by S32
United States
Finland · led by Hadean VenturesDay by day
Equity rounds in Biotech announced each day of September. The busiest day was 2 September, with 4.
By stage, against the year
Each stage's median this month beside its twelve-month median: the sector's own where we hold enough rounds for a benchmark, otherwise the one across all sectors.
The most active leads
Firms that led two or more of the month's rounds in Biotech.
Where
- United Kingdom9
- United States6
- Spain2
- Canada2
- France1
- Sweden1
- Finland1
- Switzerland1
Spain
Sweden
SwitzerlandUnited Kingdom had the most Biotech rounds this month.
Against the month
- Rounds, Biotech27
- Rounds, all sectors357
- Raised, Biotech$816M
- Raised, all sectors$39B