Callio Therapeutics
Multi-payload antibody-drug conjugates
Seattle, United States · Founded 2025 · $187.0M raised
- Headquarters
- Seattle, Washington
- Employees
- 1–10
- Founded
- 2025
- Business Model
- B2B
- Website
- calliotx.com
- Total Funding
- $187.0M
- Last Round
- $187.0M Series AMar 2025
- Rounds
- 1
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
About
Callio Therapeutics is a clinical-stage biotechnology company developing next-generation multi-payload antibody-drug conjugates (ADCs) to improve cancer therapy. Founded in 2025 and headquartered in Seattle and Singapore, the company's lead program CLIO-8221 is a dual-payload ADC targeting HER2-expressing solid tumors that delivers a topoisomerase 1 inhibitor and an ATR inhibitor simultaneously to overcome resistance to existing ADC therapies.
Summary
Callio Therapeutics is a Biotech company based in Seattle, United States, founded in 2025. It has raised $187.0M in total across 1 round, most recently a $187.0M Series A round in Mar 2025.
Tech & App Stack
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Funding History
Mar 2025
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