THIS ANNOUNCEMENT IS NOT AN OFFER FOR SALE OR SUBSCRIPTION OR SOLICITATION TO PURCHASE SHARES IN ANY JURISDICTION.

5 September 2022

Notice of Results and Investor Presentation

HydrogenOne Capital Growth plc ("HydrogenOne" or the "Company"), the first LSE-listed investment fund dedicated to clean hydrogen, announces that its half-year results for the period ended 30 June 2022 (the "Half-Year Results") are expected to be published on Tuesday, 20 September 2022.

Dr JJ Traynor and Richard Hulf, the principals of the Company's Investment Adviser, will provide a live presentation relating to the Half-Year Results via the Investor Meet Company platform on Thursday, 22 September 2022 at 3:00pm British Summer Time (BST).

The presentation is open to all existing and potential shareholders. Questions can be submitted pre-event via your Investor Meet Company dashboard up until 9.00am 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 the Company on the Investor Meet Company platform will automatically be invited.

The Company's LEI is 213800PMTT98U879SF45.

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

About HydrogenOne:

HydrogenOne 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).

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 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.