AAPG 6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington,D.C. 20549

Form6-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 March 2026

Commission File Number: 002-023311

ASCENTAGE PHARMA GROUP INTERNATIONAL

(Translation of Registrant’s name intoEnglish)

68 Xinqing Road

Suzhou Industrial Park

Suzhou, Jiangsu

China

(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 ☐

On March 13, 2026, Ascentage Pharma Group International (“Ascentage Pharma” or the “Company”) issued an announcement entitled, “Notice of Board Meeting”. A copy of the announcement is furnished as Exhibit 99.1 to this Report.

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INDEX TO EXHIBITS

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SIGNATURE

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.

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Exhibit99.1

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement.

ASCENTAGE PHARMA GROUP INTERNATIONAL

亞盛醫藥集團

(Incorporated in the Cayman Islands with limited liability)

(Stock Code: 6855)

NOTICE OF BOARD MEETING

The board of directors (the “Board”) of Ascentage Pharma Group International (the “Company”, together with its subsidiaries, collectively the “Group”) hereby announces that a meeting of the Board will be held on Wednesday, March 25, 2026, for the purpose of, among other things, considering and, if appropriate, approving the annual results of the Group for the year ended December 31, 2025 and considering the declaration of a final dividend, if any.

Suzhou, People’s Republic of China, March 13, 2026

As at the date of this announcement, the Board comprises Dr. Yang Dajun as Chairman and executive Director, Dr. Wang Shaomeng and Dr. Lu Simon DazhongNote1 as non-executive Directors, and Mr. Ye Changqing, Mr. Ren Wei, Dr. David SidranskyNote2, Ms. Marina S. Bozilenko, Dr. Debra Yu and Dr. Marc E. Lippman, MD as independent non-executive Directors.