FBLG 424B3: Secondary offering

FibroBiologics, Inc.

Filed with the SEC on Jul 16, 2026 · accession 0001193125-26-306114

FBLG filed a 424B3 (prospectus (offering)) with the SEC on Jul 16, 2026. FibroBiologics, Inc. filed a prospectus for the resale of up to 12,530,613 shares of common stock by selling stockholders, including shares issuable upon exercise of warrants from a private placement. The stock moved -0.4% by the first close after the filing.

Summary of the filing

FibroBiologics, Inc. filed a prospectus for the resale of up to 12,530,613 shares of common stock by selling stockholders, including shares issuable upon exercise of warrants from a private placement. The company will not receive proceeds from the resale but may receive up to $6.3 million if warrants are exercised.

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Key details

Maximum shares registered for resale$12.5M

Potential gross proceeds from warrant exercise$6.3M

IssuerFibroBiologics, Inc.

How FBLG stock reacted

Close before

$0.84

Jul 15, 2026

First close after

-0.36%

$0.84

5 trading days

-12.19%

$0.74

Since filing

+11.84%

$0.94

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Frequently asked questions

What did FBLG file with the SEC on Jul 16, 2026?

FBLG filed a 424B3 (Secondary offering). FibroBiologics, Inc. filed a prospectus for the resale of up to 12,530,613 shares of common stock by selling stockholders, including shares issuable upon exercise of warrants from a private placement. The company will not receive proceeds from the resale but may receive up to $6.3 million if warrants are exercised.

What does a secondary offering mean for FBLG stock?

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

How do I read a 424B3?

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 424B3 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did FBLG stock react to this filing?

FBLG closed at $0.84 before the filing and $0.84 on Jul 16, 2026 (-0.36%). Five trading days later: $0.74 (-12.19%).

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