THIS PRESS RELEASE IS RESTRICTED AND IS NOT FOR RELEASE, DISTRIBUTION OR PUBLICATION, WHETHER DIRECTLY OR INDIRECTLY AND WHETHER IN WHOLE OR IN PART, INTO OR IN THE UNITED STATES OF AMERICA, AUSTRALIA, JAPAN OR IN ANY OTHER JURISDICTION IN VIOLATION OF THE RELEVANT LAWS OF SUCH JURISDICTION.

ADVERTISEMENT. This announcement is an advertisement relating to the intention of the Company to proceed with the Offering and the admission to listing and trading of the Rights, the Offer Shares and the Additional Shares (each as defined below) (the Admission). This announcement does not constitute a prospectus. This announcement is for information purposes only and does not constitute, or form part of, an offer by, or invitation by or on behalf of, the Company or any representative of the Company to purchase any securities, or an offer to sell or issue, or the solicitation to buy, securities by any person in any jurisdiction where to do so would constitute a violation of the applicable laws or regulations of such jurisdiction. Further details about the Offering are included in the prospectus for the purposes of the Admission and is approved as such under the respective regulation by the Netherlands Authority for the Financial Markets (Stichting Autoriteit Financiële Markten, the AFM) on 27 October 2026 and available as of today (the Prospectus). The Prospectus has been published and made available at no cost through the website of the Company (https://newsroom.avantium.com/rights-offering-2026), subject to securities law restrictions in certain jurisdictions. Potential investors should read the Prospectus before making an investment decision in order to fully understand the potential risks and rewards associated with the decision to invest in the Rights, the Offer Shares or the Additional Shares. The approval of the Prospectus by the AFM should not be understood as an endorsement of the quality of the Rights, the Offer Shares or the Additional Shares.

AMSTERDAM, 27 October 2026, 08:15 hrs CET – Avantium N.V. (the “Company”, “Avantium” or the “Group”) today announces the launch of a capital increase by means of a fully committed and underwritten rights offering, for an amount of €55.45 million. The Offering is intended to remedy Avantium’s working capital shortfall, fund the ramp-up and commercialization of the FDCA Flagship Plant, and support Avantium’s transition into an industrial and commercial company focused on FDCA and PEF production and YXY^® Technology licensing.

• 4 for 3 rights offering of 33,608,956 ordinary shares at an Issue Price of €1.65 per Offer Share

• Irrevocable shareholder commitments and cornerstone investments of €13.41 million in total, including commitments from long-term shareholders INNL Publiek-Private Product Structurering B.V. (PPPS), for the account and risk of the State of the Netherlands, represented by the Minister of Climate and Green Growth (minister van Klimaat en Groene Groei), Pieter Kooi Holding B.V., Navitas B.V. and a new investor, in total representing c. 24.2% of the Offering

• The balance of the Offering has been fully underwritten for an aggregate amount of c. €42.04 million (the “Underwriting”)

• The Issue Price represents a discount of 42.7% to the theoretical ex-rights price based on the closing price of €4.52 on Euronext Amsterdam on 26 October 2026

• Ex-rights Date: 28 October 2026

• Rights trading period: from 9:00 CET on 28 October 2026 to 17:36 CET on 6 November 2026

• Record Time: 17:40 CET on 29 October 2026

• Exercise Period: from 9:00 CET on 28 October 2026 to 17:45 CET on 10 November 2026

Tom van Aken, Chief Executive Officer of Avantium, commented: “Following the successful production of the first FDCA at our FDCA Flagship Plant, we are entering an exciting new phase. This achievement marks an important step in our transition into a company focused on the production and global commercialization of FDCA and PEF. We are now producing additional FDCA, completing qualification activities and preparing for the first commercial deliveries under existing offtake agreements, expected toward the end of 2026. The successful production of FDCA at commercial scale represents an important step in the validation of our proprietary YXY^® Technology and supports our licensing strategy for future FDCA and PEF production facilities. We have secured 23 offtake agreements for material to be produced at our FDCA Flagship Plant and 17 capacity reservation agreements representing more than 150 kilotonnes of potential annual production capacity from future licensed facilities, while advancing licensing discussions with prospective partners around the world.

The fully committed and underwritten circa €55 million rights offering that we announce today is intended to support the ramp-up of our Flagship Plant, strengthen our commercial and licensing activities and provide the funding needed to execute our growth strategy. The Offering will also strengthen our balance sheet and address the Company’s identified funding requirements as we continue the transition towards commercial operations. Together with the proposed €20 million loan from the NOM (the Investment and Development Agency for the Northern Netherlands), which would provide the Company with additional financial headroom, the Offering forms an important part of our broader financing plan and supports our ambition to build a leading global business around FDCA, PEF and YXY^® Technology. We are grateful for the continued support of our shareholders, public partners and other stakeholders. Their commitment reflects a shared belief in the potential of FDCA and PEF to transform the plastics industry. We welcome both existing and new investors who share our ambition to create substantial value by bringing renewable and circular materials to market.”

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For more information:

Media:
Caroline van Reedt Dortland, Director Communications
+31-20-5860110 / +31-613400179
mediarelations@avantium.com

Investor Relations:
Aarne Luten, Director Investor Relations
+31-625687714
ir@avantium.com