United States · Who invested in Zag Bio?
Zag Bio's investors include T1D Fund, Lightspeed Venture Partners, Polaris Partners, Pear VC and Sanofi, and 5 more on record. T1D Fund led its latest round.
United States · Series A startup
Who invested in Zag Bio
Funding summaryUpdated 26 Oct 2026
$80Mraised across 1 round since 2025, from 2 sources
- Latest round
- Series A, $80MOct 2025
- Led by
- T1D Fund
- Investors
- 10 (1 led)
The rounds
- Oct 2025Series A$80M
T1D FundLead
Lightspeed Venture Partners
Polaris Partners
Pear VC
Sanofi
AbbVie
Mission BioCapital
KdT Ventures
Boxer Capital
Regeneron Ventures
Reported by Firms' own news pages and 1 other
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Quick answers about Zag Bio
How much has Zag Bio raised?
Zag Bio has raised $80M across 1 round since 2025.
When did Zag Bio last raise?
Zag Bio's most recent round was a Series A of $80M in Oct 2025, led by T1D Fund.
What was Zag Bio's biggest round?
Its most recent round, $80M in Oct 2025, is also its largest on record.
Who backed Zag Bio first?
Zag Bio's first round on record, in Oct 2025, was backed by T1D Fund, Lightspeed Venture Partners and Polaris Partners and 7 others.
What stage is Zag Bio at?
Zag Bio's latest named round is a Series A, in Oct 2025.
Where is Zag Bio based?
Zag Bio is based in the United States.
Who led Zag Bio's rounds?
T1D Fund led the Series A in 2025.
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