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
How much has Zag Bio raised?
$102.0Macross 1 recorded rounds · Oct 2025 – Oct 2025

Most recently, Zag Bio raised $80.0M in its Early Stage VC (Series A) (Oct 2025).

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Zag Bio round by round

1 rounds
Oct 2025Early Stage VC (Series A)$80.0M▮
+ 1 more investors · free account

How much has Zag Bio raised?

Zag Bio has raised $102 million in total; 1 of its rounds is on record. The largest on record was an $80 million Series A in Oct 2025.

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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Frequently asked about Zag Bio

How much has Zag Bio raised?
Zag Bio has raised $102.0M in total across 1 recorded funding rounds.
When was Zag Bio's last funding round?
Zag Bio's most recent recorded round was Early Stage VC (Series A) in Oct 2025, raising $80.0M.