Result of Retail Offer & Subscription

THIS ANNOUNCEMENT DOES NOT CONSTITUTE AN OFFER FOR SALE OR SUBSCRIPTION OF ANY SECURITIES IN INVINITY ENERGY SYSTEMS PLC.

Invinity Energy Systems plc

("Invinity" or the "Company")

Result of Retail Offer & Subscription

Aggregate Fundraising of £25 million

Restoration of Trading

Notification of Transactions by Directors

Further to the announcements on Tuesday 20 October 2026 regarding the Subscription and Retail Offer, Invinity Energy Systems plc (AIM: IES), a global leader in vanadium flow battery technology, is pleased to announce the results of the Retail Offer and the final level of the Subscription.

The Company has conditionally raised gross proceeds of £2.8 million pursuant to the Retail Offer. Accordingly, the Company will issue a total of 28,023,635 Retail Offer Shares at the Issue Price pursuant to the terms of the Retail Offer.

Pursuant to the rights under the Subscription Agreement, and as described in the Launch Announcement, the Company confirms that the conditional Subscription with NWF has increased to approximately £12.2 million and therefore the Company will issue a total of 121,976,365 Subscription Shares.

As previously announced, the Company has also conditionally raised gross proceeds of £10 million through the Placing and will therefore issue 100,000,000 Placing Shares.

Accordingly, the aggregate gross proceeds of the Fundraising will be £25 million, comprising of 250,000,000 Fundraising Shares.

The Placing, Subscription and Retail Offer are conditional upon, inter alia, the passing of certain resolutions to be put to shareholders of the Company at a General Meeting to be held on 11 November 2026. A circular containing the Notice of General Meeting is expected to be dispatched to shareholders in the coming days and a separate announcement will be made in that regard.

Applications have been made for the Placing Shares, Subscription Shares and Retail Offer Shares to be admitted to trading on AIM ("Admission"). Subject to the resolutions being passed at the General Meeting, Admission is expected to become effective on or around 12 November 2026.

Capital Access Window & Restoration of Trading

As detailed in the Company's announcement of 19 October 2026 titled “Proposed Fundraise and Capital Access Window”, the Company entered a Capital Access Window with effect from 7.30 a.m. on 19 October 2026 in connection with the Fundraise.

Following the announcement of the results of the Retail Offer and the Subscription, the Capital Access Window has now closed and trading in the Company's existing Ordinary Shares is expected to resume at 7:30 a.m. today.

PDMR Dealings

Neil O’Brien and Adam Howard, being Directors of the Company, subscribed for New Ordinary Shares as part of the Placing and Retail Offer. Further details of these transactions are set out in the PDMR notifications below.

Neil O’Brien, Non-Executive Chair of Invinity, said:

"Invinity stands at a moment of real opportunity. The challenges of transitioning from technology pioneer to commercially scaling business are well understood, but I have never been more confident in the Company's potential: its technology is proven, product costs are falling and demand for Invinity's products continues to grow as transport, heating, industry and power grids become ever more electrified.

"It has been a privilege to chair Invinity since its inception. I am immensely proud of the team and have the utmost admiration for all they have achieved. I am confident that, with Volker as Chair and Jonathan leading the executive team, Invinity will remain focused on building a business that delivers long-term value for shareholders."

Oliver Holbourn, Chief Executive Officer of National Wealth Fund, said:

“As it scales, Invinity’s vanadium flow technology will play an ever more important role in strengthening the UK’s energy security and unlocking more home-grown clean power – that’s why we are pleased to deepen our support for the Company. Our cornerstone investment has mobilised the funding Invinity needs to back British manufacturing in Scotland, commercialise its technology and transform itself into a global exporter of UK tech.”

Other than where defined, capitalised terms used in this announcement have the meanings given to them in the announcement released at 7.00 a.m. on Tuesday 20 October 2026 (the “Launch Announcement”).