Oxurion Receives Transparency Notifications from Atlas Special Opportunities LLC

Regulated Information

Leuven, BELGIUM, Boston, MA, US – September 18, 2023 – 8.00AM CET Oxurion NV (Euronext Brussels: OXUR), a biopharmaceutical company developing next generation standard of care ophthalmic therapies, with clinical stage assets in vascular retinal disorders, today announced that, pursuant to Belgian Transparency legislation¹ it has received transparency notifications as follows:

Oxurion received a first transparency notification on September 14, 2023, from Atlas Special Opportunities, LLC indicating that as of September 7, 2023, it held 106,332,703 shares of the then outstanding 2,551,311,977 shares, and therefore crossed above the threshold (3%) by virtue of the acquisition of voting securities. See Annex 1.

Oxurion received a second transparency notification on September 14, 2023, from Atlas Special Opportunities, LLC indicating that as of September 11, 2023, it held 69,155,581 shares of the then outstanding 2,551,311,977 shares, and therefore crossed below the threshold (3%) by virtue of the sale of voting securities. See Annex 2.

About Oxurion

Oxurion (Euronext Brussels: OXUR) is a biopharmaceutical company developing next generation standard of care ophthalmic therapies, which are designed to improve and better preserve vision in patients with retinal disorders including diabetic macular edema (DME), the leading cause of vision loss in working-age people, as well as other conditions. Oxurion intends to play an important role in the treatment of retinal disorders, including the successful development of THR-149, its novel therapeutic for the treatment of DME. THR-149 is a potent plasma kallikrein inhibitor being developed as a potential new standard of care for the up to 50% of DME patients showing suboptimal response to anti-VEGF therapy. Oxurion is headquartered in Leuven, Belgium, with corporate operations in Boston, MA. More information is available at www.oxurion.com.

Important information about forward-looking statements

Certain statements in this press release may be considered “forward-looking”. Such forward-looking statements are based on current expectations, and, accordingly, entail and are influenced by various risks and uncertainties. The Company therefore cannot provide any assurance that such forward-looking statements will materialize and does not assume any obligation to update or revise any forward-looking statement, whether as a result of new information, future events, or any other reason. Additional information concerning risks and uncertainties affecting the business and other factors that could cause actual results to differ materially from any forward-looking statement is contained in the Company’s Annual Report. This press release does not constitute an offer or invitation for the sale or purchase of securities or assets of Oxurion in any jurisdiction. No securities of Oxurion may be offered or sold within the United States without registration under the U.S. Securities Act of 1933, as amended, or in compliance with an exemption therefrom, and in accordance with any applicable U.S. state securities laws.

For further information please contact:

Oxurion NV Tom Graney Chief Executive Officer Tel: +32 16 75 13 10 tom.graney@oxurion.com Michael Dillen Chief Business Officer Tel: +32 16 75 13 10 michael.dillen@oxurion.com

US Conway Communications Mary T. Conway mtconway@conwaycommsir.com

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1. Article 14, first paragraph, of the Law of 2 May 2007 on disclosure of major holdings.

ANNEX 1

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ANNEX 2

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