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ZBIO 424B5: Secondary offering

Zenas BioPharma

Filed with the SEC on · accession 0001104659-26-123876

ZBIO filed a 424B5 (prospectus (offering)) with the SEC on Nov 6, 2026. Zenas BioPharma filed a 424B5 prospectus supplement under its existing S-3 shelf registration, indicating a securities offering. The stock moved +9.0% by the first close after the filing.

Summary of the filing

Zenas BioPharma filed a 424B5 prospectus supplement under its existing S-3 shelf registration, indicating a securities offering. The filing is a fee exhibit submission and does not disclose specific offering terms.

For details, click here →How to read a 424B5 →

Key details

IssuerZenas BioPharma, Inc.

How ZBIO stock reacted

Close before

$25.93

Nov 5, 2026

First close after

+8.99%

$28.26

5 trading days

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Since filing

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Frequently asked questions

What did ZBIO file with the SEC on Nov 6, 2026?

ZBIO filed a 424B5 (Secondary offering). Zenas BioPharma filed a 424B5 prospectus supplement under its existing S-3 shelf registration, indicating a securities offering. The filing is a fee exhibit submission and does not disclose specific offering terms.

What does a secondary offering mean for ZBIO stock?

New shares dilute existing holders and are often sold at a discount to the market price.

How do I read a 424B5?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 424B5 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did ZBIO stock react to this filing?

ZBIO closed at $25.93 before the filing and $28.26 on Nov 6, 2026 (+8.99%).

Other ZBIO SEC filings

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