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HTOO 424B3: Secondary offering

Fusion Fuel Green PLC

Filed with the SEC on · accession 0001493152-26-043811

HTOO filed a 424B3 (prospectus (offering)) with the SEC on Sep 23, 2026. Fusion Fuel Green PLC filed a prospectus for the resale of up to 4,993,249 Class A ordinary shares by selling shareholders, including shares issued in connection with the acquisition of Royal Uranium Inc. and shares issued to investors in an August 2026 securities purchase agreement. The stock moved +12.1% by the first close after the filing.

Summary of the filing

Fusion Fuel Green PLC filed a prospectus for the resale of up to 4,993,249 Class A ordinary shares by selling shareholders, including shares issued in connection with the acquisition of Royal Uranium Inc. and shares issued to investors in an August 2026 securities purchase agreement. The company will not receive proceeds from the resale but may receive up to approximately $2.1 million if warrants are exercised.

For details, click here →How to read a 424B3 →

Key details

Maximum shares offered for resaleshares 5.0M
Potential gross proceeds from warrant exercise$2.1M
IssuerFusion Fuel Green PLC
Acquired companyRoyal Uranium Inc.

How HTOO stock reacted

Close before

$1.99

Sep 22, 2026

First close after

+12.06%

$2.23

5 trading days

+5.03%

$2.09

Since filing

-32.66%

$1.34

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Frequently asked questions

What did HTOO file with the SEC on Sep 23, 2026?

HTOO filed a 424B3 (Secondary offering). Fusion Fuel Green PLC filed a prospectus for the resale of up to 4,993,249 Class A ordinary shares by selling shareholders, including shares issued in connection with the acquisition of Royal Uranium Inc. and shares issued to investors in an August 2026 securities purchase agreement. The company will not receive proceeds from the resale but may receive up to approximately $2.1 million if warrants are exercised.

What does a secondary offering mean for HTOO 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 HTOO stock react to this filing?

HTOO closed at $1.99 before the filing and $2.23 on Sep 23, 2026 (+12.06%). Five trading days later: $2.09 (+5.03%).

Other HTOO SEC filings

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