Shanghai Kaisai Biotechnology Co., Ltd.

Short Form Report on Changes in Equity

Name of listed company: Shanghai Kaiser Biotechnology Co., Ltd.

Stock listing place: Shanghai Stock Exchange

Stock abbreviation: Kaiser Bio.

Stock code: 688065

Information Disclosure Obligor 1: Tianjin Sitong Tongyuan Enterprise Management Partnership (Limited Partnership)

Domicile and correspondence address: No. 022, 20th Floor, Binhai Fund Town, Baofeng Building (New Finance Building), 3678 Xinhua Road, Tianjin Pilot Free Trade Zone (Central Business District)

Managing Partner: Beijing Sitong Digital Technology Co., Ltd.

Information Disclosure Obligor 2:Seasource Holdings Limited

Residence and correspondence address: Vistra Corporate Services Centre, Wickhams Cay II, Road

Town, Tortola, VG1110, British Virgin Islands

Director: Duan Yongji

Nature of share change: share reduction, shareholding ratio reduced to less than 5%

Signature Date: June 7, 2024

Information Disclosure Obligor Statement

1. information disclosure obligors prepare this report in accordance with the Securities Law of the the People's Republic of China (hereinafter referred to as the "Securities Law"), the measures for the Administration of acquisitions of listed companies (hereinafter referred to as the "measures for the Administration of acquisitions"), the standards for the contents and formats of information disclosure of companies offering securities to the public No. 15-report on changes in rights and interests (hereinafter referred to as "Standard No. 15") and relevant laws, regulations and normative documents.

2. the information disclosure obligor has obtained the necessary authorization and approval for signing this report, its performance does not violate or conflict with any provisions in the articles of association and internal management system of the information disclosure obligor.

3. In accordance with the provisions of the Securities Law, the Measures for the Administration of Acquisitions and the Guidelines No. 15, this report has fully disclosed the changes in the shares in which the information disclosure obligor has an interest in Shanghai Kaisai Biotechnology Co., Ltd. (hereinafter referred to as "Kaisai Bio", "Listed Company" and "Company").

As of the date of this report, the Disclosure Obligor has not increased or decreased the shares in which it has an interest in Kaiser Bio by any means other than the information disclosed in this report.

4. This change in equity is based on the information contained in this report. This disclosure obligor has not entrusted or authorized any other person to provide information not listed in this report and to make any explanation or explanation of this report.

5. Information Disclosure Obligor undertakes that there are no false records, misleading statements or material omissions in this report, and assumes individual and joint legal responsibility for its truthfulness, accuracy and completeness.

Directory

Interpretation of... 4

Section I Information Disclosure Obligor Introduction ...... 5.

Basic information 1. the information disclosure obligor... 5.

2. information disclosure obligors hold and control more than 5% of the shares issued by other listed companies .... 7

Section II. Purpose of equity changes and shareholding plans .... 8

1. the purpose of this equity change .... 8.

2. plans to continue increasing the number of shares it has an interest in the public company over the next 12 months... 8

Section III. Mode and details of changes in equity .... 9

1. shareholding prior to this equity change .... 9

2. the basic situation of this equity change... 9.

Restrictions on rights involved in this change of rights and interests of the 3. disclosure obligor .... 10

Sale and purchase of shares of listed companies in the first six months of the fourth section .... 11

Section V Other Significant Matters ...... 12

Section VI Reference Documents ...... 13

1. file directory for reference ...... 13

2. access location... 13

Information Disclosure Obligor Statement ...... 14.

Schedule ...... 15

Interpretation

Unless the context indicates otherwise, the following abbreviations have the following meanings in this Report:

Shanghai Kaiser Biotechnology Co., Ltd.

This report refers

Statement of Changes in Equity

Kesai Bio, listed company, company refers to Shanghai Kesai Biotechnology Co., Ltd.

Tianjin Sitong Tongyuan Enterprise Management Partnership

Information Disclosure Obligor 1, Tianjin four-way finger.

(Limited Partnership)

Information Disclosure Obligor 2, Seasource refers to the Seasource Holdings Limited.

Information Disclosure Obligor Reduces Shanghai Kaisai Bio

This change in equity refers to the total shareholding after the shares of Technology Co., Ltd.

Less than 5%

Yuan, ten thousand yuan refers to RMB yuan, RMB ten thousand yuan.

In this short-form equity change report, if there are differences in the mantissa between the partial totals and the direct sum of the additions, these differences are due to rounding.

Section I Introduction to the Obligor of Information Disclosure

Basic information of 1. information disclosure obligor

(I) basic information

1. Basic information about information disclosure obligor 1

Enterprise Name: Tianjin Sitong Longtong Tongyuan Enterprise Management Partnership (Limited Partnership)

Registered Address: Baofeng Building, 3678 Xinhua Road, Tianjin Pilot Free Trade Zone (Central Business District)

(New Finance Building) Binhai Fund Town-20th Floor -022

Managing Partner Beijing Sitong Digital Technology Co.

Unified social credit code 91120118MA07D5825P

Type of Business Limited Partnership

Established on January 18, 2016

Operating period 15 years

Name of major shareholder and holding 1. Beijing Sitong New Technology Industry Co., Ltd. holds 69.121.

2. Tianjin Ruizhi Xingkai Enterprise Management Partnership (Limited Partnership) holds shares

Unit situation

13.963 percent

General items: business management; business management consulting; information consulting services (no.

including licensing information consulting services); technical services, technical development, technical consulting

Business Scope

consultation, technology exchange, technology transfer, technology promotion. (Except subject to approval by law

In addition to the project, with a business license in accordance with the law to carry out business activities).

2. Basic information about information disclosure obligor 2

Enterprise Name Seasource Holdings Limited

Registered address Vistra Corporate Services Centre, Wickhams Cay II,

Road Town, Tortola, VG1110, British Virgin Islands

Director Duan Yongji

Registration Certificate No. 649020

Business Type Limited Liability Company

Established on March 30, 2005

Long term operating period

Name and holding of major shareholders

Long Point Holdings Limited holds 100 per cent stake

Unlimited scope of business

Main responsible persons of (II)

1. The main person in charge of the information disclosure obligor 1.

Whether to obtain other

Name, position, gender, nationality, country and region of long-term residence

Permanent residency

Execute Transaction

Zhang Disheng Partner Committee Male China China Beijing No.

send a representative

2. Information disclosure obligor 2 of the main responsible person.

Whether to obtain other

Name, position, gender, nationality, country and region of long-term residence

Permanent residency

Duan Yongji Director Male China China Beijing No

Explanation of the existence of a concerted action person relationship between the obligor of (III) information disclosure.

Tianjin Sitong and Seasource are controlled by Duan Yongji, are controlled by the same subject, and have a relationship of concerted action.

2. information disclosure obligors hold and control more than 5% of the issued shares of other listed companies

As of the date of signing of this report, the information disclosure obligor does not hold shares of other listed companies in China or abroad that have an interest in the company of 5% or more of the issued shares of the company.

Section II Purpose of Changes in Equity and Shareholding Plan

1. the purpose of this equity change

The reduction of the shares of the information disclosure obligor is based on its own financial needs.

2. plan to continue to increase the number of shares it has an interest in the listed company over the next 12 months

The information disclosure obligor does not rule out the possibility of continuing to reduce its holdings of the company's shares in the next 12 months. If relevant equity changes occur, the information disclosure obligor will perform its information disclosure obligations in a timely manner in strict accordance with relevant laws and regulations.

Information DisclosureAt present, the agent has no plan to increase the company's shares in the next 12 months. In case of relevant equity changes, the information disclosure obligor will perform the information disclosure obligation in a timely manner in strict accordance with the provisions of relevant laws and regulations.

Section III. Modes and details of changes in equity

Shareholdings of 1. before this change in equity

Prior to this equity change, the Information Disclosure Obligor held a total of 47,017,833 shares of the Company's unrestricted tradable shares, accounting for 8.060 of the total share capital of Kaiser Bio. Among them, Tianjin Sitong holds 43,588,782 shares of the company, accounting for 7.472 of the company's total share capital; Seasource holds 3,429,051 shares of the company, accounting for 0.588 of the company's total share capital.

Basic information 2. the change in equity

The information disclosure obligor shall pass the centralized bidding party from September 14, 2023 to June 7, 2024.

In total, the Company's shares were reduced by 17,849,129 shares, accounting for 3.060 of the Company's total share capital.

The specific changes are as follows:

Name of shareholder Reduction Method of reduction Time of reduction of shares Reduction of shares Reduction of number of shares Change ratio

Type (%)

2023 9

Tianjin Four-way Centralized Bidding Month 14~1.000 5,831,780 of Outstanding Shares

12 2023

Month 8

2023 9

Tianjin Sitong Bulk Trading Month 14~1.900 of 11,086,996 of outstanding shares

6 in 2024

Month 7

12 2023

Seasource Bulk Trading Month 12~930,353 0.159 of shares outstanding

2024 4

Month 25

Total 17,849,129 3.060

Before and after the change in equity, the changes in the shares of the listed company held by the information disclosure obligor are as follows:

Before this change After this change

Name of shareholder Total shareholding Percentage of shareholding Percentage of shareholding Percentage of shareholding

(Share) (%) (Share) (%)

Tianjin Sitong 43,588,782 7.472 26,670,006 4.572

Seasource 3,429,051 0.588 2,498,698 0.428

Total 47,017,833 8.060 29,168,704 5.000

Restrictions on rights involved in this change of rights and interests of the 3. information disclosure obligor

As of the date of this report, there are no restrictions or restrictions on the transfer of rights, such as pledge, seizure or freezing, on the shares involved in this change of interest.

Section 4: Trading of shares of listed companies in the preceding six months

In addition to the information disclosed in this report, the information disclosure obligor did not buy or sell the company's shares in the six months prior to this change in equity.

Section 5 Other Major Matters

1. Except for the information disclosed in this report, there is no other information that should be disclosed but not disclosed by the information disclosure obligor.

The 2. Information Disclosure Obligor declares that there are no false records, misleading statements or material omissions in this report, and assumes individual and joint legal responsibility for its truthfulness, accuracy and completeness.

Section VI Documents for Reference

1. Reference File Directory

1. Business license of the obligor of information disclosure;

2. List of principal persons in charge of the information disclosure obligor and identification documents;

3. The Short Form Report on Changes in Equity signed by the information disclosure obligor.

2. Access Location

The full text of this report and the above-mentioned reference documents are available in the Securities Affairs Department of the listed company.

Information Disclosure Obligor Statement

The Information Disclosure Obligor undertakes that there are no false records, misleading statements or material omissions in this report, and assumes individual and joint legal responsibility for its truthfulness, accuracy and completeness.

Information Disclosure Obligor 1 (Seal): Tianjin Sitong Longyuan Enterprise Management Partnership (Limited Partnership)

The executive partner appoints a representative (signature):_________________

Zhang Disheng

Information Disclosure Obligor 2:Seasource Holdings Limited

Appointed Representative (Signature and Seal):_________________

Duan Yongji

Signature Date: June 7, 2024

Schedule

Basic information

Listed company Shanghai Kaisai Biotechnology shares have listed companies.

Shanghai

Name Limited Company Location

Stock abbreviation Kaiser Bio Stock Code 688065

Tianjin Pilot Free Trade Zone (Central Merchants

Information Disclosure

Information Disclosure: Tianjin Sitong Longtongyuan Enterprise Management District) No. 3678 Xinhua Road, Baofeng

Name of Service 1 Partnership (Limited Partnership) Service 1 Registration Building (New Finance Building) Binhai

Ground

Fund Town-20th Floor -022

Vistra Corporate Services

Disclosure Centre, Wickhams Cay II,

Information Disclosure Seasource Holdings

Name of Service 2 Service 2 Registration Road Town, Tortola,

Limited ground

VG1110, British Virgin

Islands

Increase □ Decrease in ownership interest? Is there a consistent line

Yes? No □

The number of shares changes the same, but the shareholders change moving.

Change □

Information disclosure meaning Information disclosure meaning.

Whether the service person is a service person is a service person.

Yes □ No? Yes □ No?

Listed Company No.

One major shareholder inter-controller

Centralized trading through a stock exchange? Transfer by agreement □

Administrative transfer or change of state-owned shares □ indirect transfer □

equity change party

Acquisition of new shares issued by listed companies □ Execution of court rulings □ Inheritance □

Formula (multi-choice)

Gift □

Others □ (please specify)

Information Disclosure

Type of shares before disclosure by the agent: RMB ordinary shares (A shares)

having an interest

Number of shares and number of shares held: 47,017,833 shares

Percentage of listed companies

Proportion of shares issued: 8.060 per cent

Proportion

This equity change

Type of shares: RMB ordinary shares (A shares)

After moving, the information is covered

Obligor

Number of changes: 17,849,129 shares

Shares in interest

Quantity of change

Percentage of change: 3.060 per cent

and variation ratio

Information Disclosure

Whether the service person intends

In the next 12 Yes □ No?

Continue to increase in the month

Hold

Information Disclosure

The people before.

6 months

Yes? No □

in the secondary market

Buy and sell the listing

Company Stock

Involving the reduction of shares by the controlling shareholder or actual controller of a listed company, the information disclosure obligor shall also explain the following:

controlling shareholder or

Actual controller

Whether the reduction

Existence of infringement is not applicable

City companies and shares

Question of East Rights

Topic

controlling shareholder or

Actual controller

Whether the reduction

Existence of outstanding

its effect on the company's

Liabilities, undischarged Not applicable

The company is negative.

The burden provided by the debt.

protection, or damage

the interests of the company

Other situations

This equity change

Whether the movement needs to be taken or not

must be approved

whether it has been obtained

Not applicable

Approved

(This page has no text and is the signature page of the Schedule to the Short Form Report on Changes in Equity of Shanghai Kaisai Biotechnology Co., Ltd.)

Information Disclosure Obligor 1 (Seal): Tianjin Sitong Longyuan Enterprise Management Partnership (Limited Partnership)

The executive partner appoints a representative (signature):_________________

Zhang Disheng

Information Disclosure Obligor 2:Seasource Holdings Limited

Appointed Representative (Signature and Seal):_________________

Duan Yongji

Signature Date: June 7, 2024