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RemeGen Co., Ltd.*

Rongchang Biopharmaceutical (Yantai) Co., Ltd. (a joint stock limited company incorporated in the People's Republic of China) (Stock code: 9995)

Overseas regulatory announcement

This announcement is made by Rongchang Biopharmaceuticals in accordance with Rule 13.10B of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited. (Yantai) Co., Ltd. (the "Company").

The announcement published by the Company on the website of the Shanghai Stock Exchange is set out below for reference only.

By order of the board of directors Rongchang Biopharmaceutical (Yantai) Co., Ltd.

Chairman and Executive Director Mr. Wang Weidong

Yantai, China July 19, 2026

As at the date of this announcement, members of the Board of Directors include executive directors Mr. Wang Weidong, Dr. Fang Jianmin, and Wen Qingkaixian. Sheng, Ms. Fang Yi and Mr. Wang Yuxiao; non-executive director Dr. Wang Liqiang; and independent non-executive director Song Xiliang

Mr. Huang Guobin and Mr. Chen Yunjin.

*For identification only

Securities code: 688331 Securities abbreviation: Rongchang Biotechnology Announcement number: 2026-033

Rongchang Biopharmaceutical (Yantai) Co., Ltd.

Regarding the first repurchase of the company’s shares through centralized bidding in 2026

plan

The board of directors and all directors of the company guarantee that the contents of this announcement do not contain any false records or misleading statements.

or major omissions, and shall bear legal responsibility for the authenticity, accuracy and completeness of its content in accordance with the law.

Important content reminder:

Amount of share repurchase: no less than RMB 25 million (inclusive) and no more than RMB 50 million ● (inclusive).

Source of funds for repurchasing shares: the company's own funds and/or self-raised funds. ●

Purpose of repurchased shares: The shares repurchased this time are intended to be used for employee stock ownership plans or equity incentives. If the company does not ● The repurchased shares can be used within 3 years after the announcement of the implementation results of this share repurchase and share changes. Unused repurchased shares will be cancelled. If the state adjusts relevant policies, this repurchase plan will be adjusted accordingly

subsequent policy implementation.

Share repurchase price: no more than 149 yuan/share (inclusive). The price is not higher than the repurchase resolution passed by the board of directors ● 120% of the average trading price of the company's stock in the previous 30 trading days.

Share repurchase method: centralized bidding transaction. ● Period for repurchasing shares: Within 12 months from the date the company’s board of directors considers and approves the share repurchase plan. ● Whether relevant shareholders have plans to reduce their holdings: As of the date of this announcement, the company’s controlling shareholder, actual controlling shareholder ● persons and persons acting in concert, other directors, senior managers, and shareholders holding more than 5% of the shares in the next three months,

There are no plans to reduce the company's A-share holdings in the next six months. If relevant personnel plan to implement A-share share reduction in the future,

In accordance with the plan, the company will promptly fulfill its information disclosure obligations in accordance with relevant regulations.

Related risk warnings: ●

1. If during the period of this repurchase, the company’s stock price continues to exceed the upper limit of the repurchase price disclosed in the repurchase plan,

There is a risk that the repurchase plan will not be implemented smoothly.

2. If something happens during the repurchase period of this share repurchase that has a significant impact on the company’s stock trading price

major events, or major changes in the company’s production and operations, financial conditions, external objective conditions, or other causes

If an event occurs that causes the company's board of directors to decide to terminate this repurchase plan, then there is no plan to repurchase shares.

The risk of the smooth implementation of the law or the change or termination of this repurchase plan in accordance with relevant regulations.

3. The shares repurchased this time are intended to be used to implement employee stock ownership plans or equity incentives. If the company fails to comply with the law

If the above purposes are implemented within the time limit specified by regulations, there is a risk of initiating the cancellation procedure for the untransferred shares.

4. If the regulatory authorities promulgate new repurchase-related normative documents, there may be problems that may lead to the implementation of this repurchase.

Cheng needs to adjust the risk of corresponding repurchase terms according to new regulatory regulations.

The company will make repurchase decisions based on market conditions during the repurchase period and implement them.

We will promptly perform information disclosure obligations on the progress of share purchase matters, and investors are advised to pay attention to investment risks.

1. Review and implementation procedures of the repurchase plan

(1) On July 19, 2026, the company held the second meeting of the third board of directors, with all directors attending

The meeting reviewed and approved the "Resolution on the 2026 Proposal" with 9 votes in favor, 0 abstentions and 0 votes against. A proposal to repurchase the company's shares through centralized bidding transactions."

(2) According to the "Share Repurchase Rules of Listed Companies" and the "Self-Discipline Supervision Guidelines for Listed Companies of the Shanghai Stock Exchange"

Cited No. 7 - Repurchase of Shares" and the "Articles of Association of Rongchang Biopharmaceutical (Yantai) Co., Ltd." (hereinafter (referred to as the "Articles of Association")), the plan to repurchase shares must be approved by more than two-thirds of the directors present.

It can be implemented after it is reviewed and approved by the board of directors and does not need to be submitted to the company's shareholders' meeting for review.

The above-mentioned board of directors review time and procedures are in compliance with the "Self-discipline Supervision Guidelines for Listed Companies of the Shanghai Stock Exchange" Citing No. 7—Repurchase of Shares" and other relevant provisions.

2. Main contents of the repurchase plan

The main contents of this buyback plan are as follows:

The first disclosure date of the repurchase plan is 2026/7/20 The implementation period of the repurchase plan is 12 months after review and approval by the board of directors Plan date and proposer 2026/7/19 The estimated repurchase amount is 25 million yuan to 50 million yuan

Source of repurchase funds Others: the company’s own funds and/or self-raised funds The upper limit of buyback price is 149 yuan/share □Reduce registered capital √Used for employee stock ownership plans or equity incentives Repurchase purpose □Used to convert company convertible bonds □To protect the company’s value and shareholders’ rights and interests Share repurchase method Centralized bidding transaction method Number of shares repurchased: 167,800 shares to 335,600 shares (calculated based on the upper limit of the repurchase price) The proportion of repurchased shares in total equity is 0.03%~0.06%

(1) Purpose of repurchasing shares

Based on the confidence in the company's future development and recognition of the company's value, in order to fully stimulate the positive attitude of the company's employees

nature, continue to establish the company's long-term incentive mechanism, and enhance investors' investment confidence in the company, closely integrating with the company's

The interests of the company, shareholders and employees, and comprehensive consideration of the company's stock price, operating conditions, financial status, etc.

Continuing to implement the action plan of "Improving Quality, Increasing Efficiency and Focusing on Returns", the company plans to repurchase Company A through centralized bidding transactions.

The repurchased shares will be used for employee stock ownership plans or equity incentives at an appropriate time in the future. If the company fails The repurchased shares have been used within 3 years after the announcement of the results of the share repurchase and the share changes, and the unused shares

Shares repurchased will be cancelled. If the state adjusts relevant policies, this repurchase plan will be based on the adjusted policies.

Implement.

(2) Type of shares to be repurchased

A shares of RMB ordinary shares issued by the company.

(3) Methods of repurchasing shares

Centralized bidding transaction method

(4) Implementation period for share repurchase

1. Within 12 months from the date the company’s board of directors considers and approves the share repurchase plan. Buyback implementation period

During the period, if the company's stock is suspended for more than 10 consecutive trading days due to planning of major events, the repurchase plan will be

After the resumption of trading, the implementation will be postponed and disclosed in a timely manner.

2. If the following conditions are met, the repurchase period will expire early:

(1) If the amount of shares repurchased by the company reaches the upper limit during the repurchase period, the repurchase

After the implementation of the plan is completed, the repurchase period will expire early from that date;

(2) If during the repurchase period, the company’s share repurchase amount reaches the lower limit, the repurchase

The term may expire early from the date the company decides to terminate this repurchase plan;

(3) If the company’s board of directors resolves to terminate this repurchase plan, the repurchase period shall start from the date when the board of directors resolves to terminate this repurchase plan.

It will expire in advance from the date of the repurchase plan.

3. The company will not repurchase the company’s shares during the following periods:

(1) Since the occurrence of major events that may have a significant impact on the trading prices of the company’s securities and derivatives

from the date of birth or during the decision-making process to the date of disclosure in accordance with the law;

(2) Other circumstances specified by the China Securities Regulatory Commission and the Shanghai Stock Exchange.

During the period of the repurchase plan reviewed and approved by the board of directors, if relevant laws, regulations and normative documents If there are any changes in the relevant provisions of the above-mentioned non-repurchase period, the latest laws, regulations and normative documents will be followed.

Request that the repurchase program be adjusted accordingly.

(5) Purpose, quantity, proportion to the company’s total share capital, and total funds of the shares to be repurchased

Amount to be repurchased Proportion to the company’s total share capital Total funds to be repurchased Purpose of repurchase Implementation period of repurchase (10,000 shares) Example (%) Amount (10,000 yuan)

For employee holdings, subject to review by the company’s board of directors

Share plan or shares 16.78-33.56 0.03-0.06 2,500-5,000 Through this repurchase plan

Within 12 months from the date of right incentive

The number of planned repurchases is calculated based on the upper limit of the repurchase price of 149 yuan/share. The specific repurchase quantities and the company's

The proportion of total equity is based on the company's actual repurchase situation when the repurchase is completed or the repurchase implementation period expires. If you are back

During the purchase period, the company implemented capital reserve funds to increase share capital, distributed stock dividends, stock splits, share reductions or allotments. For ex-rights and dividend matters such as shares, the company will respond in accordance with the relevant regulations of the China Securities Regulatory Commission and the Shanghai Stock Exchange.

The number of shares purchased will be adjusted accordingly.

(6) Price or price range and pricing principles for repurchasing shares

The company’s price for repurchasing shares this time is no more than RMB 149 per share (inclusive), which price does not exceed the price of the directors.

120% of the average trading price of the company's A shares in the 30 trading days before the board of directors passed the repurchase resolution. The specific repurchase price is determined by

The company's board of directors authorizes the company's management to consider the secondary market stock transaction price, the company's

Financial and operating conditions are determined.

For example, during the repurchase period, the company implements the conversion of capital reserve funds into share capital, cash dividends, distribution of stock dividends,

For ex-rights and dividend matters such as rights issue, stock split or share reduction, the company will comply with the regulations of China Securities Regulatory Commission and Shanghai Securities Exchange.

The relevant regulations of the Exchange will make corresponding adjustments to the upper limit of the repurchase price.

(7) Sources of funds for repurchasing shares

The source of funds for this share repurchase is the company's own funds and/or self-raised funds.

(8) Estimated changes in the company’s equity structure after the repurchase

According to the lower limit of RMB 25 million (inclusive) and the upper limit of RMB 50 million (inclusive) for this repurchase amount, The upper limit of the repurchase price is 149 yuan/share for calculation, assuming that all the shares repurchased are used to implement the employee stock ownership plan.

Or equity incentives are all locked up. It is expected that the changes in the company’s equity structure after the repurchase are as follows:

After repurchase After repurchase Before this repurchase (Calculated based on the lower limit of repurchase) (Calculated based on the upper limit of repurchase) Share Class Number of shares Ratio Number of shares Number of shares Ratio Proportion (%) (shares) (%) (shares) (shares) (%) Circulable shares with sales restrictions 0 0 0 0 0 0 Shares without selling restrictions 564,477,483 100.00 564,477,483 100.00 564,477,483 100.00 Among them: special buy-back certificate 194,144 0.03 361,929 0.06 529,714 0.09 Securities account Total number of shares 564,477,483 100.00 564,477,483 100.00 564,477,483 100.00

Note: The above changes have not yet taken into account the impact of other factors. The above calculation data are for reference only. The specific number of shares repurchased and

The actual changes in the company's equity structure will be subject to subsequent implementation. Any discrepancies in the data are due to rounding.

(9) This share repurchase will have an impact on the company’s daily operations, finance, research and development, profitability, and debt performance.

analysis of possible impacts on the company's strength, future development and maintenance of listing status

1. As of March 31, 2026 (unaudited), the company’s total assets were 7,365,193,905.76 yuan.

The net assets attributable to shareholders of the listed company are 3,928,464,653.69 yuan, and the current assets are

4,112,057,982.68 yuan. Calculated based on the upper limit of the repurchase funds of RMB 50 million, the above financial

0.68%, 1.27%, 1.22% of the data. According to this repurchase plan, the source of repurchase funds is the company’s own funds.

and/or self-financed, which will not have a significant impact on the company's solvency. According to the company's operating conditions and future development development plan, the company believes that this share repurchase will not have any impact on the company’s daily operations, finance, profitability and future

The development has a significant impact and the company has sufficient ability to pay the repurchase price.

2. The shares repurchased this time will be used for the company’s employee stock ownership plan or equity incentives, which is conducive to the continuous improvement of the company The long-term incentive mechanism more closely and effectively combines the interests of shareholders, the interests of the company and the personal interests of employees.

to promote the healthy and sustainable development of the company.

3. After the share repurchase is completed, it will not lead to a change in the company’s control. After the repurchase, the company’s equity The distribution meets the conditions of a listed company and will not affect the company's listing status.

(10) Directors, senior managers, controlling shareholders, actual controllers and persons acting in concert of listed companies Whether the company’s shares were purchased or sold within 6 months before the board of directors made a resolution to repurchase shares, and whether the repurchase party

There is a conflict of interest in the case, whether there is insider trading and market manipulation, and whether there are increases or decreases during the repurchase period.

Description of the status of the plan

The company's directors, senior managers, controlling shareholders, actual controllers and persons acting in concert are making repurchases

There was no direct purchase or sale of the company's A shares within 6 months before the share resolution, and there was no

There is no conflict of interest, insider trading or market manipulation in the plan.

The above-mentioned entities have no plans to increase or decrease their holdings of A shares during this repurchase period. If they subsequently increase or decrease their holdings of A shares,

According to this plan, the company will strictly abide by laws and regulations and perform its information disclosure obligations in a timely manner.

(11) Listed companies report to directors, senior managers, controlling shareholders, actual controllers, and those holding more than 5% of the shares

Shareholders on the website asked whether there are specific plans to reduce their holdings in the next three months, the next six months, etc.

Upon inquiry by the company, it was confirmed that as of the date when the board of directors reviewed and approved the repurchase plan, the company’s directors and senior executives senior managers, controlling shareholders, actual controllers and persons acting in concert, and shareholders holding more than 5% of the shares in the next 3

There are no plans to reduce the company’s A-share holdings in the next six months. If the above-mentioned relevant parties plan to

When implementing the plan to reduce its A-share holdings, the company will strictly comply with relevant laws, regulations and normative documents.

fulfill information disclosure obligations in a timely manner.

(12) Relevant arrangements for cancellation or transfer of shares after repurchase in accordance with the law

The shares repurchased this time are planned to be used for employee stock ownership plans or equity incentives at an appropriate time in the future. If the company has not

The repurchased shares can be used within 3 years after the announcement of the share repurchase implementation results and share changes, and the shares have not yet been used.

The repurchased shares will be cancelled. If the state makes adjustments to relevant policies, this repurchase plan will be based on the adjusted policy implementation.

(13) Relevant arrangements of the company to prevent infringement of the interests of creditors

This repurchase of shares will not affect the company's normal ongoing operations, nor will it cause the company to become insolvent.

situation. If the company repurchases shares and plans to cancel them in the future, the company will follow the Company Law of the People's Republic of China, etc.

The relevant provisions of laws and regulations fully protect the legitimate rights and interests of creditors.

(14) Specific authorization to handle the repurchase of shares

In order to complete the company's share repurchase work efficiently and orderly, the company's board of directors authorized the company's management to fully

The authority has the right to handle matters related to this share repurchase. The content and scope of the authorization include but are not limited to:

1. Establishing a special securities account for repurchase and other related matters;

2. Choose an opportunity to repurchase shares during the repurchase period, including but not limited to the specific time, price and Quantity, etc.;

3. Within the scope permitted by laws, regulations and normative documents, within the repurchase period, the company and the market will

According to the specific circumstances, we will formulate and adjust the specific implementation plan for the repurchase of shares, including but not limited to the timing of repurchase, Repurchase price, repurchase quantity and other matters related to this repurchase;

4. Handle relevant approval matters, including but not limited to production, authorization, signing, execution, modification, and completion

All necessary documents, contracts, agreements, etc. related to this share repurchase. According to the actual repurchase situation, the Modify the "Articles of Association" and other information and document terms that may involve changes, and apply for the "Articles of Association"

Matters such as modification of the "Program" and industrial and commercial change registration (if involved);

5. If the regulatory authorities’ policy on share repurchase changes or market conditions change, other than those involving In addition to matters that must be re-voted by the board of directors according to relevant laws, regulations and the Articles of Association, the company is authorized to manage

The management will make corresponding adjustments to the specific plan for the share repurchase and other related matters;

6. In accordance with applicable laws, regulations, and relevant regulations of regulatory authorities, handle other matters not listed above. Matters necessary for this share repurchase.

The above authorization is valid from the date the board of directors considers and approves the repurchase plan until the above authorization matters are processed.

Ends on the date of completion.

3. Uncertainty Risks of Repurchase Plan

4. If during the period of this repurchase, the company’s stock price continues to exceed the upper limit of the repurchase price disclosed in the repurchase plan, There is a risk that the repurchase plan will not be implemented smoothly.

5. If something happens during the repurchase period of this share repurchase that has a significant impact on the company’s stock trading price

major events, or major changes in the company’s production and operations, financial conditions, external objective conditions, or other causes If an event occurs that causes the company's board of directors to decide to terminate this repurchase plan, then there is no plan to repurchase shares.

The risk of the smooth implementation of the law or the change or termination of this repurchase plan in accordance with relevant regulations.

3. The shares repurchased this time are intended to be used to implement employee stock ownership plans or equity incentives. If the company fails to comply with the law If the above purposes are implemented within the time limit specified by regulations, there is a risk of initiating the cancellation procedure for the untransferred shares.

4. If the regulatory authorities promulgate new repurchase-related normative documents, there may be problems that may lead to the implementation of this repurchase.

Cheng needs to adjust the risk of corresponding repurchase terms according to new regulatory regulations.

The company will make repurchase decisions based on market conditions during the repurchase period and implement them.

We will promptly perform information disclosure obligations on the progress of share purchase matters, and investors are advised to pay attention to investment risks.

Announcement is hereby made.

Rongchang Biopharmaceutical (Yantai) Co., Ltd. Board of Directors July 20, 2026