Ad hoc announcement pursuant to Art. 53 LR

• Leclanché will be unable to publish its 2024 annual report by 31^st May 2025, the initial extended deadline granted by SIX Exchange Regulation AG (SER) on 29^th April 2025.
• Leclanché has filed on time a request to extend the deadline for publishing its 2024 annual report until 30^th June 2025 but has not yet received the decision by the SER’s Issuers Committee.
• Consequently, the trading of the Leclanché registered shares on SIX Swiss Exchange will be temporary suspended as of 2^nd June 2025 according to art. 57 of the SIX listing rules and as stated in the decision of SER concerning the temporary exemption from the disclosure obligation in connection with the publication and the filing of the 2024 annual report dated 29^th April 2025.
• To reinforce its going concern status through June 2026, the Company has taken or is pursuing the following measures that will allow the publication of its 2024 annual report:
  • Execution of two subordination agreements with key lenders to address the over-indebtedness situation.
  • Active efforts to secure bridge financing of CHF 40 million.
  • Continued collaboration with Pinnacle International Venture Capital Limited on a long-term financing plan of up to CHF 360 million.

 YVERDON-LES-BAINS, Switzerland, 31 May 2025 – Leclanché SA (SIX: LECN), one of the world’s leading energy storage companies, announces that it will be unable to publish its 2024 annual report by 31^st May 2025, the initial extended deadline granted by SIX Exchange Regulation AG (SER) on 29^th April 2025.

Leclanché has submitted a timely second request to the SER for an extension of the deadline to publish its 2024 annual report until 30^th June 2025. However, the decision from the SER’s Issuers Committee is still pending.

As a result, the trading of the Leclanché registered shares on SIX Swiss Exchange will be temporary suspended as of 2^nd June 2025 according to art. 57 of the SIX listing rules and as stated in the decision of SER concerning the temporary exemption from the disclosure obligation in connection with the publication and the filing of the annual report 2024 dated 29^th April 2025.

As previously disclosed, the Company was in a situation of negative equity as of 31^st December 2024 and continues to implement a series of measures with the aim to achieve and maintain a positive equity position and demonstrate its ability to operate as a going concern through at least June 2026.

Key measures taken or underway include:

• Loan Subordination: CHF 40.9 million in loans were subordinated via two agreements signed with creditors on 6 and 13 May 2025, respectively.
• Debt-to-Equity Conversion: CHF 25.4 million of convertible loans were converted into equity in March and April 2025, significantly improving the Company’s capital structure.
• Bridge Financing: The Company is currently arranging a CHF 40 million bridge financing, structured as a convertible loan, with up to CHF 23 million expected to be converted into equity subject to shareholders’ approval at the upcoming Annual General Meeting (AGM).
• Long-Term Strategic Financing: Leclanché continues to work with Pinnacle International Venture Capital Limited on a long-term financing plan of up to CHF 360 million, which will support the production capacity expansion in Germany and strengthen the Company’s working capital.

The combination of these actions aims to strengthen the Company’s balance sheet and ensure long-term sustainability.

Given the ongoing implementation of these initiatives, Leclanché will not be able to publish its 2024 annual report by 31^st May 2025 and remains confident that it will be able to publish its 2024 annual report within the next few days.

For more information, write to info@leclanche.com or visit www.leclanche.com.

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About Leclanché

Leclanché is a world leading provider of low-carbon footprint energy storage solutions based on lithium-ion cell technology. Established in 1909 in Yverdon-les-Bains, Switzerland, Leclanché’s history and heritage is rooted in battery and energy storage innovation. The company’s Swiss culture for precision and quality, together with its production facilities in Germany, make Leclanché the partner of choice for companies seeking the very best in battery performance and who are pioneering positive changes in how energy is produced, distributed and consumed around the world. Leclanché is organised into three business units: energy storage solutions, e-Mobility solutions and specialty battery systems. The company currently employs over 350 people with representative offices in eight countries around the world. Leclanché is listed on the Swiss Stock Exchange (SIX: LECN). SIX Swiss Exchange : ticker symbol LECN | ISIN CH 011 030 311 9

Disclaimer

This press release contains certain forward-looking statements relating to Leclanché’s business, which can be identified by terminology such as “strategic”, “proposes”, “to introduce”, “will”, “planned”, “expected”, “commitment”, “expects”, “set”, “preparing”, “plans”, “estimates”, “aims”, “would”, “potential”, “awaiting”, “estimated”, “proposal”, or similar expressions, or by expressed or implied discussions regarding the ramp up of Leclanché’s production capacity, potential applications for existing products, or regarding potential future revenues from any such products, or potential future sales or earnings of Leclanché or any of its business units. You should not place undue reliance on these statements. Such forward-looking statements reflect the current views of Leclanché regarding future events, and involve known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from any future results, performance or achievements expressed or implied by such statements. There can be no guarantee that Leclanché’s products will achieve any particular revenue levels. Nor can there be any guarantee that Leclanché, or any of the business units, will achieve any particular financial results.

 Media contacts:

Switzerland / Europe: 

Thierry Meyer

T: +41 (0) 79 785 35 81

E-Mail: tme@dynamicsgroup.ch

Germany:

Christoph Miller

T: +49 (0) 711 947 670

E-Mail: leclanche@sympra.de

Investor contacts:

Hubert Angleys / Pierre Blanc

T: +41 (0) 24 424 65 00

E-Mail: invest.leclanche@leclanche.com