Zag Bio
Targeting the thymus to treat autoimmunity
Cambridge, United States · Founded 2022 · $80.0M raised
- Headquarters
- Cambridge, Massachusetts
- Employees
- 11–50
- Founded
- 2022
- Business Model
- B2B
- Website
- zagbio.com
- Total Funding
- $80.0M
- Last Round
- $80.0M Series AOct 2025
- Rounds
- 1
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
About
Zag Bio develops thymus-targeted medicines intended to treat and prevent autoimmune diseases by restoring central immune tolerance. Its bifunctional antibodies deliver self-antigens to antigen-presenting cells in the thymus, engaging the natural process that trains immune cells to recognize and tolerate self and halting or preventing autoimmune attacks. The company's pipeline includes ZAG-101 for Type 1 diabetes as well as discovery programs for other autoimmune diseases.
Summary
Zag Bio is a Biotech company based in Cambridge, United States, founded in 2022. It has raised $80.0M in total across 1 round, most recently a $80.0M Series A round in Oct 2025. Investors include Polaris Partners, JDRF T1D Fund and AbbVie Ventures.
Tech & App Stack
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Funding History
Oct 2025
Investors
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