Belgium - Celyad Oncology SA (Euronext: CYAD) ('Celyad Oncology' or the 'Company') today announced, in accordance with Article 14 of the Belgian Law of 2 May 2007 regarding the publication of major shareholdings in issuers whose securities are admitted to trading on a regulated market, that it received a transparency notification dated September 8, 2023, from Tolefi SA and related persons indicating that they have jointly crossed the 20% threshold, holding 6,568,978 shares, or 22.74% of the voting rights of the Company as of September 4, 2023.

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