Typical Series A round size for biotech startups in Boston
Based on 38 Form D filings by Boston biotech issuers at Series A stage, filed Nov 2024 – Sep 2026. Updated monthly. Change any segment to compare.
The numbers
- Median Series A raise: $10.8M
- Middle half of rounds: $5.5M – $28.7M
- Filings in sample: 38
- Rounds under $1M: 3%
- Rounds over $5M: 79%
- Updated Sep 2026
Read this number carefully
Form D undercounts small SAFE rounds and rounds that rely on other exemptions. Treat the median as a ceiling for "typical", not a target.