Typical seed round size for biotech startups in the US
Based on 394 Form D filings by United States biotech issuers at seed stage, filed Oct 2024 – Sep 2026. Updated monthly. Change any segment to compare.
The numbers
- Median seed raise: $2M
- Middle half of rounds: $800k – $4.2M
- Filings in sample: 394
- Rounds under $1M: 29%
- Rounds over $5M: 18%
- 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.
Compare segments
Biotech · Seed · Boston ($4.2M)
Biotech · Seed · Bay Area ($3.8M)