Fusion Fuel Green PLC

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 20-F

(Mark one)

OR

For the fiscal year ended December 31,2025

OR

For the transition period from __________ to _________

OR

Date of event requiring this shell company report __________

Commission file number001-39789

Fusion Fuel Green PLC

(Exact name of the Registrant as specified in its charter)

Not Applicable

(Translation of Registrant’s name into English)

(Jurisdiction of incorporation or organization)

9 Pembroke Street Upper

Dublin, D02 KR83

(Address of principal executive offices)

Frederico Figueira de Chaves, Chief Executive Officer, Interim

Chief Financial Officer, and Chief Strategy Officer

9 Pembroke Street Upper

Dublin D02 KR83

Tel:+353 1 961 9350

(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)

Securities registered or to be registered pursuant to Section 12(b) of the Act:

Securities registered or to be registered pursuant to Section 12(g) of the Act:

None

(Title of Class)

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act:

None

(Title of Class)

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report:2,288,291 Class A Ordinary Shares with a nominal value of $0.0035 each as of December 31, 2025.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

Note – Checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 from their obligations under those Sections.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or an emerging growth company. See definition of “large accelerated filer,” “accelerated filer,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act.☐

† The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.☒

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☒

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

(APPLICABLE ONLY TO ISSUERS INVOLVED IN BANKRUPTCY PROCEEDINGS DURING THE PAST FIVE YEARS)

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Sections 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.

FUSION FUEL GREEN PLC

Annual Report on Form 20-F

Year Ended December 31, 2025

TABLE OF CONTENTS

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CERTAIN INFORMATION

As used in this Annual Report on Form 20-F (this “Annual Report”), unless otherwise indicated or the context otherwise requires, references to:

iii

Unless otherwise stated, in this Annual Report, references to “dollars” and “$” are to the legal currency of the United States (“U.S.”), and all references to “euros” and “€” are to the legal currency of the European Union (“EU”). Our reporting currency and our functional currency is euros.

Unless otherwise stated, the translations from U.S. dollars to euros in this Annual Report were made at a rate of $1.1736 to €1.00, which was the historical rate set forth in the H.10 statistical release of the U.S. Federal Reserve Board as of December 31, 2025. On April 24, 2026, the noon buying rate for converting euro to dollars was $1.1718 per €1.00. No representation is made that the euro or U.S. dollar amounts referred to in this Annual Report could have been or could be converted into U.S. dollars or euros, as the case may be, at any particular rate or at all. Any discrepancies in any table between totals and sums of the amounts listed are due to rounding.

The audited consolidated financial statements and notes thereto as of and for fiscal years ended 2025, 2024 and 2023 included elsewhere in this Annual Report have been prepared in accordance with International Financial Reporting Standards (“IFRS”). Our fiscal year end is December 31.

Unless otherwise noted, the share and per share information in this report have been adjusted to give effect to the one-for-thirty-five (1-for-35) share consolidation of the Class A Ordinary Shares, which became legally effective at 5:00 PM Eastern Time on July 11, 2025.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report contains or may contain forward-looking statements as defined in Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), that involve significant risks and uncertainties. All statements other than statements of historical facts are forward-looking statements. These forward-looking statements include information about our possible or assumed future results of operations or our performance. These statements involve known and unknown risks, uncertainties and other factors, including those listed under Item 3.D. “Risk Factors,” Item 5.A. “Operating Results,” and elsewhere in this Annual Report that may cause our actual results, performance or achievements to be materially different from those expressed or implied by the forward-looking statements.

In some cases, these forward-looking statements can be identified by words and phrases such as “may,” “will,” “believes,” “expects,” “anticipates,” “estimates,” “projects,” “intends,” “should,” “seeks,” “future,” “continue,” “plan,” “target,” “predict,” “potential,” or the negative form of these words and phrases or other comparable expressions. The forward-looking statements included in this Annual Report relate to, among other things:

The forward-looking statements contained in this Annual Report speak only as of the date of this Annual Report or, if obtained from third-party studies or reports, the date of the corresponding study or report, and are expressly qualified in their entirety by the cautionary statements in this Annual Report. Since we operate in an emerging and evolving environment and new risk factors and uncertainties emerge from time to time, you should not rely upon forward-looking statements as predictions of future events. Except as otherwise required by the securities laws of the United States, we undertake no obligation to update or revise any forward-looking statements to reflect events or circumstances after the date of this Annual Report or to reflect the occurrence of unanticipated events.

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PART I