Celyad Oncology SA

Publication of a transparency notification received from Tolefi SA (Article 14 §1 of the Law of 2 May 2007)

Regulatory News:

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 (the “Transparency Law”), that it received a transparency notification dated November 28, 2023, from Tolefi SA and related persons indicating that they have jointly crossed passively below the 15% threshold, holding 6,568,978 shares, or 14.997 % of the voting rights of the Company as of November 14, 2023.

Content of the Notification:

• Reason of the Notification:
  Threshold crossing passively
  

• Notification by:
  Persons acting in concert
  

• Persons subject to the notification requirement:
  Tolefi SA, Chaussée de Waterloo 1589D, 1180 Uccle
  Serge Goblet
  Isabelle Thoumyre
  Jérôme Goblet
  Jean-Daniel Goblet
  

• Date on which the threshold is crossed:
  November 14, 2023
  

• Threshold that is crossed (in %):
  15
  

• Denominator:
  43,796,947
  

• Notified details:

A) Voting Rights	Previous notification	After the Transaction
	#of voting rights	# of voting rights		% of voting rights
Holders of voting rights		Linked to the securities	Not linked to the securities	Linked to the securities	Not linked to the securities
Tolefi SA	6,504,854	6,504,864	0	14.85%	0.00%
Serge Goblet	56,180	56,180	0	0.13%	0.00%
Isabelle Thoumyre