Celyad Oncology SA

Publication of a Transparency Notification Received From Fortress Investment Group LLC

Regulatory News:

Celyad Oncology SA (Euronext: CYAD) (“Celyad Oncology” or the “Company”) (Brussels:CYAD) (Paris:CYAD) (NASDAQ:CYAD) today announces, 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 notification of transparency dated December 19, 2023, indicating that CFIP CLYD (UK) Limited, an affiliate of Fortress Investment Group LLC, has crossed the statutory threshold of 55%, holding 29,358,654 voting rights, i.e. 58.37 % of Celyad Oncology’s voting rights.

Content of the Notification:

• Reason of the Notification:
  Passive crossing of a threshold

• Notification by:
  A parent undertaking or a controlling person

• Persons subject to the notification requirement:
  Fortress Investment Group LLC - 1345 Avenue of the Americas, New York, NY 10105 United States
  CFIP CLYD (UK) Limited - 7 Clarges Street, 4th Floor, London W1J 8AE, United Kingdom

• Date on which the threshold is crossed:
  December 8, 2023

• Threshold that is crossed (in %):
  55

• Denominator:
  50,296,947

• 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 t the securities	Linked to the securities	Not linked to the securities
Fortress Investment Group LLC	0	0	0	0.00 %	0.00 %
CFIP CLYD (UK) Limited	22,858,654	29,358,654	0	58.37%	0.00 %
Subtotal