/-- Announcement on Implementation of Semi-annual Dividend Distribution for 2025
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-- Announcement on Implementation of Semi-annual Dividend Distribution for 2025

Shanghai Stock Exchange
2025/09/06

Securities code: 603520 Securities abbreviation: Stellie Announcement number: 2025-042

Zhejiang Stell Pharmaceutical Co., Ltd.

Announcement on the Implementation of Semi-annual Equity Distribution in 2025

The company's board of directors and all directors guarantee that the contents of this announcement do not contain any false records, misleading statements or major omissions, and assume legal responsibility for the authenticity, accuracy and completeness of its contents.

Important content reminder:

 Distribution ratio per share

Cash dividend of RMB 0.05 per share for A shares

 Relevant dates

Class of shares Equity registration date Last trading day Ex-rights (dividend) date Cash dividend payment date

A shares 2025/9/11 - 2025/9/12 2025/9/12  Differentiated dividend transfer: No

1. The session and date of the general meeting of shareholders passing the distribution plan

This profit distribution plan was reviewed and approved by the company's 2024 annual shareholders' meeting on May 22, 2025, and the board of directors was authorized to handle matters related to interim profit distribution with full authority. On August 28, 2025, the 17th meeting of the fifth board of directors reviewed and approved.

2. Distribution plan

  1. Disbursement year: Half year of 2025

  2. Assign objects:

As of the closing of the Shanghai Stock Exchange in the afternoon of the equity registration day, all shareholders of the company registered with the Shanghai Branch of China Securities Depository and Clearing Co., Ltd. (hereinafter referred to as "China Clearing Shanghai Branch").

  1. Distribution plan:

This profit distribution is based on the company's total share capital of 438,409,881 shares before the implementation of the plan. A cash dividend of 0.05 yuan (tax included) will be distributed per share, and a total cash dividend of 21,920,494.05 yuan will be distributed.

3. Relevant dates

Class of shares Equity registration date Last trading day Ex-rights (dividend) date Cash dividend payment date

A shares 2025/9/11 - 2025/9/12 2025/9/12

4. Distribution Implementation Methods

  1. Implementation measures

(1) Dividends of non-restricted tradable shares are entrusted to China Clearing Shanghai Branch to be distributed through its fund clearing system to shareholders who are registered after the Shanghai Stock Exchange closes on the equity registration date and have completed designated transactions with each member of the Shanghai Stock Exchange. Investors who have completed designated transactions can receive cash dividends at their designated securities business department on the dividend distribution date. Shareholder dividends that have not completed designated transactions will be temporarily kept by China Securities Clearing Company Shanghai Branch and will be distributed after designated transactions are completed.

(2) If bonus shares are distributed or capitalized, the Shanghai Branch of China Securities Clearing Company shall directly account it into the shareholder's account in proportion based on the number of registered shareholders' shares held after the Shanghai Stock Exchange closes on the equity registration date.

  1. Issue objects by yourself

The cash dividends of the company's shareholders, Mr. Hu Jinsheng and Mr. Hu Jian, will be distributed by the company itself.

  1. Tax deduction instructions

(1) For individual shareholders and securities investment funds who hold the company’s A-shares without selling restrictions, according to the “Notice on Issues Concerning the Implementation of Differentiated Personal Income Tax Policies on Dividends and Bonuses of Listed Companies” (Caishui [2012] No. 85) and the “Notice on Issues Concerning the Differentiated Personal Income Tax Policy on Dividends and Bonuses of Listed Companies” (Caishui) According to the provisions of the Tax [2015] No. 101), if the shareholding period exceeds one year, personal income tax will be temporarily exempted from this dividend payment, and the actual cash dividend per share will be RMB 0.05; if the shareholding period is within one year (inclusive), personal income tax will not be withheld for this dividend and the actual cash dividend will be RMB 0.05 per share. When an individual shareholder transfers his or her shares after the equity registration date, the Shanghai Branch of CSDC will calculate the actual tax payable based on the shareholding period. Securities companies and other stock custody institutions will deduct the amount from the individual's capital account and transfer it to the Shanghai Branch of CSDC. The Shanghai Branch of CSDC will transfer it to the company within 5 working days of the following month. The company shall declare and pay the tax to the competent tax authority within the statutory reporting period of the month in which the tax is received. The specific actual tax burden is: if the shareholder's holding period is less than 1 month (including 1 month), the full amount of the dividend income will be included in the taxable income, and the actual tax burden is 20%; if the holding period is from more than 1 month to 1 year (inclusive), 50% will be included in the taxable income, and the actual tax burden will be 10%; if the holding period exceeds 1 year, the dividend income will be temporarily exempt from personal income tax.

(2) For individual shareholders holding A-shares with restricted trading conditions, according to the "Notice on Issues Concerning the Implementation of Differentiated Personal Income Tax Policies on Dividends and Bonuses of Listed Companies" (Caishui [2012] No. 85), dividends obtained before the ban is lifted will continue to be temporarily reduced and included in the calculation at 50% The taxable income is subject to a personal income tax rate of 20%. The actual tax rate is 10%. The actual after-tax cash dividend per share is RMB 0.045. For dividends obtained after the ban is lifted, the holding period is calculated from the date of the lifting of the ban, and the tax is calculated differentially according to the stockholding period in accordance with regulations;

(3) For qualified foreign institutional investors (QFII) who hold the company's A shares, according to the "Notice on Issues Concerning the Withholding and Payment of Corporate Income Tax on Dividends, Dividends and Interests paid by Chinese Resident Enterprises to QFIIs" (Guo Shui Han [2009] No. 47) promulgated by the State Administration of Taxation, the company withholds and pays corporate income tax at a rate of 10%, and the actual after-tax cash dividend per share is RMB 0.045. If relevant shareholders believe that the dividend income they receive needs to enjoy the benefits of a tax treaty (arrangement), they may apply to the competent tax authorities on their own after receiving the dividends in accordance with regulations.

(4) When Hong Kong Stock Exchange investors (including enterprises and individuals) invest in A-shares of Shanghai Stock Exchange companies ("Shanghai-Hong Kong Stock Connect"), their dividends will be distributed by the company in RMB through the China Clearing Shanghai Branch according to the account of the nominal holder of the stock. According to the provisions of the "Notice of the Ministry of Finance, the State Administration of Taxation, and the China Securities Regulatory Commission on Tax Policies for the Pilot Program of the Shanghai-Hong Kong Stock Market Interconnection Mechanism" (Caishui [2014] No. 81), the company withheld and paid income tax at a tax rate of 10%, and the actual after-tax cash dividend per share was RMB 0.045.

(5) For other institutional investors and legal person shareholders, the cash dividend income tax shall be determined by the taxpayer in accordance with the tax laws and regulations. The actual cash dividend distributed is RMB 0.05 per share.

5. Consultation methods

If you have any questions about this equity distribution, you can consult according to the following contact information:

Contact Department: Corporate Securities Department

Contact number: 0576-87718605

Announcement is hereby made.

Board of Directors of Zhejiang Stell Pharmaceutical Co., Ltd.

September 6, 2025