Update: Notice of Webcast

LEI: 213800PMTT98U879SF45

30 April 2025

HydrogenOne Capital Growth plc)

('HydrogenOne' or the 'Company')

Update: Notice of Webcast

HydrogenOne Capital Growth ('HydrogenOne' or the 'Company'), the first London-listed fund investing in clean hydrogen for a positive environmental impact, announced results for the year ended 31 December 2024 on Wednesday 30 April 2025.

There will be a live presentation open to all existing and potential shareholders and analysts via the Investor Meet Company platform, today at 1pm. This will be the sole webcast today. The presentation will be hosted by Richard Hulf and Dr JJ Traynor, Managing Partners of the Company's investment adviser, HydrogenOne Capital LLP. Questions can be submitted pre-event via your Investor Meet Company dashboard up until 9am the day before the meeting or at any time during the live presentation.

Investors can sign up to Investor Meet Company for free and add to meet HydrogenOne via:

https://www.investormeetcompany.com/hydrogenone-capital-growth-plc/register-investor

Investors who already follow HydrogenOne on the Investor Meet Company platform will automatically be invited.

- Ends -

Notes

For further information, please visit www.hydrogenone.com or contact:

About HydrogenOne:

HydrogenOne is the first London-listed hydrogen fund investing in clean hydrogen for a positive environmental impact. The Company was launched in 2021 with an investment objective to deliver an attractive level of capital growth by investing in a diversified portfolio of hydrogen and complementary hydrogen focussed assets. INEOS Energy is a strategic investor in HydrogenOne. The Company is listed on the London Stock Exchange's main market (ticker code: HGEN). The Company is an Article 9 climate impact fund with an ESG policy integrated in investment decisions and asset monitoring.

IMPORTANT NOTICE

This announcement does not constitute an offer to sell, or the solicitation of an offer to acquire or subscribe for, shares in the Company in any jurisdiction. The distribution of this announcement outside the UK may be restricted by law. No action has been taken by the Company that would permit possession of this announcement in any jurisdiction outside the UK where action for that purpose is required. Persons outside the UK who come into possession of this announcement should inform themselves about the distribution of this announcement in their particular jurisdiction.

This announcement contains (or may contain) certain forward-looking statements with respect to certain of the Company's plans and/or the plans of one or more of its investee companies or projects and their respective current goals and expectations relating to their respective future financial condition and performance and which involve a number of risks and uncertainties. The Company cautions readers that no forward- looking statement is a guarantee of future performance and that actual results could differ materially from those contained in the forward- looking statements.

This announcement contains inside information for the purposes of Article 7 of Regulation (EU) No 596/2014, as it forms part of UK domestic law ("MAR"). Upon publication of this announcement, the inside information is now considered to be in the public domain for the purposes of MAR. The person responsible for arranging the release of this announcement on behalf of the Company is HydrogenOne. HydrogenOne (FRN: 954060) is an appointed representative of Thornbridge Investment Management LLP (FRN: 713859) which is authorised and regulated by the Financial Conduct Authority.