Duality Biotherapeutics, Inc. — Proxy Solicitation & Information Statement 2026

Apr 9, 2026

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

DualityBio

映恩生物

Duality Biotherapeutics, Inc.

映恩生物

(Incorporated in the Cayman Islands with limited liability)

(Stock code: 9606)

BOOK CLOSURE PERIOD FOR THE

EXTRAORDINARY GENERAL MEETING

The Board (the "Board") of directors (the "Directors") of Duality Biotherapeutics, Inc. (the "Company") hereby announces that an extraordinary general meeting (the "EGM") will be held at Board Room, 11/F, Building A, No. 868 Yinghua Road, Pudong New Area, Shanghai, the PRC on Wednesday, April 29, 2026 at 9:00 a.m.

The register of members of the Company will be closed from Friday, April 24, 2026 to Wednesday, April 29, 2026 (both days inclusive), during which period no transfer of shares in the Company will be registered, for the purpose of determining the identity of the shareholders entitled to attend and vote at the EGM. In order to qualify for attending and voting at the EGM, all transfers of shares, accompanied by the relevant share certificates and transfer forms, must be lodged with the Company's Hong Kong branch share registrar, Computershare Hong Kong Investor Services Limited, at Shops 1712-1716, 17th Floor, Hopewell Centre, 183 Queen's Road East, Wanchai, Hong Kong for registration no later than 4:30 p.m. on Thursday, April 23, 2026.

The Company will dispatch the circular and notice of the EGM, as well as the related proxy form to the shareholders of the Company in due course.

By Order of the Board

Duality Biotherapeutics, Inc.

Dr. ZHU Zhongyuan

Chairman of the Board, Executive

Director and Chief Executive Officer

Hong Kong, April 9, 2026

As at the date of this announcement, the Board comprises (i) Dr. ZHU Zhongyuan, Mr. ZHANG Shaoren and Dr. HUA Haiqing as executive directors; (ii) Mr. CAI Zhiyang and Dr. YU Tao as non-executive directors; and (iii) Mr. XIE Dong, Mr. GAO Fengyong and Ms. CHUAI Shuyin as independent non-executive directors.