Zag Bio

Drug Delivery · Cambridge, MA · Founded 2022 · Privately Held (backing)

Operator of a therapeutic platform intended to offer precise medicines for immune-mediated diseases. Zag Bio is based in Cambridge, MA and was founded in 2022. Its last reported valuation was $25 million in Jul 2023. It has raised $102 million across 1 recorded round; the latest was an $80 million Series A in Oct 2025.

Last reported valuation
$25.0M
Oct 2026
Priced at
—
Total raised
$102.0M
Last round
Early Stage VC (Series A)
Oct 2025

Who backs Zag Bio?

17 investors
InvestorType
GaingelsVenture capital
Pear (California)Venture capital
Alexandria Venture InvestmentsOther
The EngineOther
ExitfundVenture capital
Polaris PartnersVenture capital
Mission BioCapitalVenture capital
Revelation PartnersVenture capital
Macroscopic Ventures—
Lightspeed VenturesVenture capital
+ 7 more investors · a free account shows the complete list
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Zag Bio investors

17 investors are on record for Zag Bio, including Gaingels, Pear (California), Alexandria Venture Investments and The Engine. By type, the record holds 7 venture capital firms. The Series A in Oct 2025 drew 15 investors.

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