Zag Bio
PrivateLast Round
Series A
Oct 28, 2025
Total Funding Raised
$80M
Momentum
Top 25%
of companies Caplight tracks
Company Overview
Zag Bio operates in Healthcare & Life Sciences and is based in Cambridge, Massachusetts. Its latest recorded funding round was a Series A round in October 2025.
Zag Bio is a biotechnology company that develops thymus-targeted medicines for autoimmune diseases.
Sector
Healthcare & Life Sciences
Verticals
Biotechnology, Drug Discovery, Clinical Trials
Business Model
B2B
Customer Profile
Revenue Share, Government Contracts
AI Layer
Non-AI
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Zag Bio Comparables
Compare Zag Bio with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Quell Therapeutics | 78% | |
| COUR Pharmaceuticals | 77% | |
| Parvus Therapeutics Inc. | 77% |
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Zag Bio Funding Rounds
Historical fundraising activity
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Key People
Founding team and executive leadership
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Zag Bio Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Boxer Capital | Series A |
| Codon Capital | Series A |
| Gaingels | Series A |
| Pear VC | Series A |
| AbbVie Ventures | Series A |
| Alexandria Venture Investments | Series A |
| Sanofi Ventures | Series A |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Aug 21, 2026
Monthly visitors grew 43% MoM, from 475 to 679.
- Jul 28, 2026
Monthly visitors grew 73% MoM.
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Zag Bio Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
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Frequently Asked Questions
Common questions about Zag Bio's valuation, stock price, and market status.
Is Zag Bio a public or private company?
Zag Bio is a private company.
What is the current stock price of Zag Bio?
Zag Bio is a private company, so its shares have no public market price. Caplight tracks Zag Bio's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Zag Bio worth (valuation)?
Valuation information for Zag Bio is not publicly available.
Can I buy Zag Bio stock?
Zag Bio shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Zag Bio's last funding round?
Zag Bio's most recent funding round was Series A on October 28, 2025.
Who are the main investors in Zag Bio?
Key investors in Zag Bio include JDRF, Polaris Partners.
Will Zag Bio IPO soon?
No public IPO plans have been announced for Zag Bio.
How can I track Zag Bio secondary market activity?
Caplight tracks bids, offers, and trades in Zag Bio's shares on secondary markets.