# 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. Source: https://millionrounds.com/news/monthly/2026-09/sector/biotech (Millionrounds; every figure on the page links to its filing or article) Equity rounds **27** in Biotech, 26 with an amount Raised **$816M** across those rounds Lead named **78%** of rounds say who led Share of the month **8%** of rounds; 2% of the money ## The biggest rounds - [1 **Biossil** Series B · Canada · led by OpenAI Startup Fund **$153M**](https://millionrounds.com/company/biossil) - [2 **Basecamp Research** Series C · United Kingdom · led by S32 **$140M**](https://millionrounds.com/company/basecamp-research) - [3 **BigHat Biosciences** Series C · United States **$75M**](https://millionrounds.com/company/bighat-biosciences) - [4 **OMass Therapeutics** Series C · United Kingdom **$53M**](https://millionrounds.com/company/omass-therapeutics) - [5 C **Caspian Therapeutics** Series A · led by BVF Partners **$50M**](https://millionrounds.com/company/caspian-therapeutics) - [6 **Aptadir Therapeutics** Seed · United Kingdom · led by 4BIO Capital **$46M**](https://millionrounds.com/company/aptadir-therapeutics) - [7 **Evvy** Series B · United States · led by Catalio Capital Management **$40M**](https://millionrounds.com/company/evvy) - [8 **Microbiotica** Series C · United Kingdom · led by British Business Bank **$35M**](https://millionrounds.com/company/microbiotica) - [9 **Kasvu Therapeutics** Series A · Finland · led by Hadean Ventures **$34M**](https://millionrounds.com/company/kasvu-therapeutics) - [10 **Cloverleaf Bio** Seed · led by 4BIO Capital **$33M**](https://millionrounds.com/company/cloverleaf-bio) ## Day by day Equity rounds in Biotech announced each day of September. The busiest day was 2 September, with 4. 1 September 30 September ## 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. [Pre-seed](https://millionrounds.com/benchmarks/pre-seed) *3* **$2.0M** this month **$2.0M** 12 months, all sectors [Seed](https://millionrounds.com/benchmarks/seed/biotech) *9* **$4.0M** this month **$6.7M** 12 months here [Series A](https://millionrounds.com/benchmarks/series-a/biotech) *6* **$20M** this month **$33M** 12 months here [Series B](https://millionrounds.com/benchmarks/series-b/biotech) *4* **$35M** this month **$55M** 12 months here [Series C](https://millionrounds.com/benchmarks/series-c) *5* **$64M** this month **$100M** 12 months, all sectors ## The most active leads Firms that led two or more of the month's rounds in Biotech. - [**4BIO Capital** Aptadir Therapeutics, Cloverleaf Bio *2 led*](https://millionrounds.com/fund/4bio-capital) ## Where - [United Kingdom](https://millionrounds.com/news/monthly/2026-09/united-kingdom) **9** - [United States](https://millionrounds.com/news/monthly/2026-09/united-states) **6** - Spain **2** - [Canada](https://millionrounds.com/news/monthly/2026-09/canada) **2** - [France](https://millionrounds.com/news/monthly/2026-09/france) **1** - Sweden **1** - Finland **1** - Switzerland **1** United Kingdom had the most Biotech rounds this month. ## Against the month - Rounds, Biotech **27** - Rounds, all sectors **357** - Raised, Biotech **$816M** - Raised, all sectors **$39B** [The whole of September 2026](https://millionrounds.com/news/monthly/2026-09) ## Other sectors in September [195 rounds **AI** *→*](https://millionrounds.com/news/monthly/2026-09/sector/ai)[51 rounds **Fintech** *→*](https://millionrounds.com/news/monthly/2026-09/sector/fintech)[39 rounds **Healthcare** *→*](https://millionrounds.com/news/monthly/2026-09/sector/healthcare)[30 rounds **Big Data & Analytics** *→*](https://millionrounds.com/news/monthly/2026-09/sector/big-data)[25 rounds **Robotics** *→*](https://millionrounds.com/news/monthly/2026-09/sector/robotics)[24 rounds **Cybersecurity** *→*](https://millionrounds.com/news/monthly/2026-09/sector/cybersecurity)[23 rounds **Hardware & Electronics** *→*](https://millionrounds.com/news/monthly/2026-09/sector/hardware)[22 rounds **Enterprise Software** *→*](https://millionrounds.com/news/monthly/2026-09/sector/enterprise-software)[21 rounds **Software** *→*](https://millionrounds.com/news/monthly/2026-09/sector/software)[21 rounds **Energy** *→*](https://millionrounds.com/news/monthly/2026-09/sector/energy)[21 rounds **Construction** *→*](https://millionrounds.com/news/monthly/2026-09/sector/construction)[20 rounds **Healthtech** *→*](https://millionrounds.com/news/monthly/2026-09/sector/healthtech)[20 rounds **SaaS** *→*](https://millionrounds.com/news/monthly/2026-09/sector/saas)[19 rounds **Logistics** *→*](https://millionrounds.com/news/monthly/2026-09/sector/logistics)[17 rounds **Manufacturing** *→*](https://millionrounds.com/news/monthly/2026-09/sector/manufacturing)[16 rounds **Cleantech** *→*](https://millionrounds.com/news/monthly/2026-09/sector/cleantech)[14 rounds **Aerospace & Space** *→*](https://millionrounds.com/news/monthly/2026-09/sector/aerospace)[14 rounds **Defence Tech** *→*](https://millionrounds.com/news/monthly/2026-09/sector/defensetech)[13 rounds **Telecoms** *→*](https://millionrounds.com/news/monthly/2026-09/sector/telecom)[13 rounds **Semiconductors** *→*](https://millionrounds.com/news/monthly/2026-09/sector/semiconductors)[13 rounds **Climate Tech** *→*](https://millionrounds.com/news/monthly/2026-09/sector/climate)[11 rounds **Automotive & EVs** *→*](https://millionrounds.com/news/monthly/2026-09/sector/automotive)[10 rounds **Cloud** *→*](https://millionrounds.com/news/monthly/2026-09/sector/cloud) **How this roundup is made** It is written from the rounds we read that month in named articles and filings, by the sectors we file each company under; a company can sit in more than one, so sector roundups overlap. Only equity rounds with a stage count; debt, grants and public companies' raises do not. Each sector with 10 or more equity rounds in a month gets its own roundup. We read more sources every month, so compare medians, not totals. [How we read rounds](https://millionrounds.com/methodology) · [Report a mistake](https://millionrounds.com/corrections)