CYAD Celyad Oncology SA

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the Month of September 2023

Commission File Number: 001-37452

CELYAD ONCOLOGY SA

(Translation of registrant’s name into English)

Rue Edouard Belin 2

1435 Mont-Saint-Guibert, Belgium

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40- F.

Form 20-F  ☒            Form 40-F  ☐

Celyad Oncology SA

Further to the press release on September 7, 2023, on September 15, 2023, Celyad Oncology SA (the “Company”) issued a press release announcing that 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”), it received a rectified notification of transparency dated September 13, 2023 indicating that CFIP CLYD (UK) Limited, an affiliate of Fortress Investment Group LLC, has crossed the statutory threshold of 25%. CFIP CLYD (UK) Limited holds 7,954,808 ordinary shares, with no nominal value per share (“Ordinary Shares”), representing 29.99% of the Company’s Ordinary Shares and 27.53% of voting rights as of September 4, 2023.

A copy of the Company’s press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

The information contained in this Current Report on Form 6-K, including Exhibit 99.1 is hereby incorporated by reference into the Company’s Registration Statements on Forms F-3 (File No. 333-248464) and S-8 (File No. 333- 220737).

EXHIBITS

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Exhibit 99.1

				Press Release - Regulated Information

Publication of a rectified transparency notification received from

Fortress Investment Group LLC

(Article 14 §1 of the Law of 2 May 2007)

Mont-Saint-Guibert, Belgium, September 15, 2023, 10.01 pm CET – regulated information – 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 rectified notification of transparency dated September 13, 2023, indicating that CFIP CLYD (UK) Limited, an affiliate of Fortress Investment Group LLC, has crossed the statutory threshold of 25%, holding 7,954,808 shares i.e. 29.99% of Celyad Oncology’s shares and 27.53% voting rights as of September 4, 2023. This press release replaces the press release dated September 7, 2023.

Content of the Notification:

Acquisition or disposal of voting securities or voting rights

A parent undertaking or a controlling person

Fortress Investment Group LLC—1345 Avenue of the Americas, New York, NY 10105 United States

CFIP CLYD 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

September 4, 2023

25

28,893,101

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		Press Release - Regulated Information

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This transparency notification covers the following transactions:

After both transactions, CFIP CLYD (UK) Limited will hold 7,954,808 shares of Celyad Oncology.

Miscellaneous

https://celyad.com/newsroom/

https://celyad.com/investors/regulated-information/

Any transparency notification must be sent to our Company by email to the attention of Georges Rawadi, Chief Executive Officer (CEO): investors@celyad.com

About Celyad Oncology

Celyad Oncology is a cutting-edge biotechnology company dedicated to pioneering the discovery and advancement of revolutionary technologies for chimeric antigen receptor (CAR) T-cells. Its primary objective is to unlock the potential of its proprietary technology platforms and intellectual property, enabling to be at the forefront of developing next-generation CAR T-cell therapies. By fully leveraging its innovative technology platforms, Celyad Oncology aims to maximize the transformative impact of its candidate CAR T-cell therapies and redefine the future of CAR T-cell treatments. Celyad Oncology is based in Mont-Saint-Guibert, Belgium. For more information, please visit www.celyad.com.

Forward-looking statements

This release may contain forward-looking statements, within the meaning of applicable securities laws, including the Private Securities Litigation Reform Act of 1995, as amended, including, without limitation, statements regarding beliefs about and expectations for the Company’s updated strategic business model, including associated potential benefits, transactions and partnerships, statements regarding the potential value of the Company’s IP, and statements regarding the transparency notification. The words “will,” “believe,” “potential,” “continue,” “target,” “project,” “should” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Any forward-looking statements in this release are based on management’s current expectations and beliefs and are subject to a number of known and unknown risks, uncertainties and important factors which might cause actual events, results, financial condition, performance or achievements of Celyad Oncology to differ materially from those expressed or implied by such forward-looking statements. Such risks and uncertainties include, without limitation, risks related to the material uncertainty about the Company’s ability to continue as a going concern; the Company’s ability to realize the expected benefits of its updated strategic business model; the Company’s ability to develop its IP assets and enter into partnerships with outside parties; the Company’s ability to enforce its patents and other IP rights; the possibility that the Company may infringe on the patents or IP rights of others and be required to defend against patent or other IP rights suits; the possibility that the Company may not successfully defend itself against claims of patent infringement or other IP rights suits, which could result in substantial claims for damages against the Company; the possibility that the Company may become involved in lawsuits to protect or enforce its patents, which could be expensive, time-consuming, and unsuccessful; the Company’s ability to protect its IP rights throughout the world; the potential for patents held by the Company to be found invalid or unenforceable; and other risks identified in Celyad Oncology’s U.S. Securities and Exchange Commission (SEC) filings and reports, including in the latest Annual Report on Form 20-F filed with the SEC and subsequent filings and reports by Celyad Oncology. These forward-looking statements speak only as of the date of publication of this document

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		Press Release - Regulated Information

and Celyad Oncology’s actual results may differ materially from those expressed or implied by these forward-looking statements. Celyad Oncology expressly disclaims any obligation to update any such forward-looking statements in this document to reflect any change in its expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based, unless required by law or regulation.

Celyad Oncology Contacts:

Source: Celyad Oncology SA

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