Lai Shen Tongling Jewelry Co., Ltd. Simplified Equity Change Report

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Name of listed company: Leshengtongling Jewelry Co., Ltd. Listed on the stock exchange: Shanghai Stock Exchange

Stock abbreviation: Leshengtongling Stock code: 603900

Party with information disclosure obligations: Eurostar Diamonds (Shanghai) Co., Ltd.

Address or contact address: Room 1001B-2, Building A, No. 1701 Century Avenue, China (Shanghai) Pilot Free Trade Zone

Nature of changes in interests: Decrease in shares

Signing date: 18 03 2026

Statement of the party with information disclosure obligations

I. Basis of this report by the party with information disclosure obligations

The party with information disclosure obligations has prepared this report on changes in interests in accordance with the Securities Law of the People’s Republic of China (hereinafter referred to as the “Securities Law”),

the Measures for the Administration of Takeovers of Listed Companies (2020 Revised) (hereinafter referred to as the “Takeover Measures”), the Guidelines for Information Disclosure Content and Format of Publicly Issued Securities No. 15—Report on Changes in Equity Interests, and relevant laws and regulations.

II. Authorization and compliance

The party with information disclosure obligations has obtained the necessary authorizations and approvals for signing this report on changes in interests; its performance does not violate any provisions in the internal regulations of the party with information disclosure obligations, or conflict with them.

III. Full disclosure of the changes in shares

Pursuant to the provisions of the Securities Law, the Takeover Measures, etc., this report on changes in interests has comprehensively disclosed the changes in shares in which the party with information disclosure obligations holds interests in Leshengtongling Jewelry Co., Ltd. (hereinafter referred to as the “Company,” “listed company,” and “Leshengtongling”).

As of the date of signing this report, except for the information disclosed in this report, the party with information disclosure obligations has not increased or decreased its shares in Leshengtongling through any other means.

IV. Scope of information and non-delegation

This change in interests has been carried out based on the information stated in this report. Except for the information disclosed in this report, the party with information disclosure obligations has not entrusted or authorized any other person to provide information not listed in this report, nor to make any interpretation or explanation of this report.

V. Commitments

The party with information disclosure obligations undertakes that this report on changes in interests contains no false records, misleading statements, or material omissions, and it assumes separate and joint legal liability for the authenticity, accuracy, and completeness thereof.

Chapter I Definitions

In this report, unless otherwise stated, the following abbreviated terms have the meanings indicated below:

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Chapter II Introduction to the party with information disclosure obligations

I. Basic information of the information discloser

(I) Basic information

1. Company name: Eurostar Diamonds (Shanghai) Co., Ltd.

2. Unified Social Credit Code: 91310115735420700Y

3. Enterprise type: Limited liability company (Sino-foreign joint venture)

4. Date of establishment: 09 02 2002

5. Registered address: Room 1001B-2, Building A, No. 1701 Century Avenue, China (Shanghai) Pilot Free Trade Zone

6. Registered capital: USD 15,000,000

7. Legal representative: FONG WAH KAI

8. Business scope: Carrying out diamond (excluding gold and silver) trading at the Shanghai Diamond Exchange (including re-export trade, processing trade, and import and export business)

9. Major shareholders:

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Yihuitong Investment & Industrial (Shanghai) Co., Ltd. (hereinafter referred to as “Yihuitong”) previously held 41.66667% of the shares of Eurostar Diamonds (Shanghai) Co., Ltd. (hereinafter referred to as “Eurostar Diamonds”) on behalf of Eurostar Diamonds International SA (hereinafter referred to as “EDI”). In January 2026, the nominee arrangement was not disclosed correctly and in a timely manner; Eurostar Diamonds was issued a warning letter by the Jiangsu CSRC and received regulatory warning from the Shanghai Stock Exchange. At the end of January 2026, Yihuitong and EDI have terminated the nominee arrangement of the equity. At present, the equity structure of Eurostar Diamonds is clear and stable.

10. Basic information of key management personnel

Name: FONG WAH KAI

Position: Legal representative

(II) Holding shares in other listed companies of 5% or more

As of the date of signing this report, Eurostar Diamonds (Shanghai) Co., Ltd. has no shares with interests in other listed companies, whether within or outside the Mainland, that have reached or exceeded 5% of the issued shares of that company.

Chapter III Purpose and Plan of the Change in Interests

I. Purpose of this change in interests

This change in interests is a partial reduction of the Company’s shares conducted by Eurostar Diamonds (Shanghai) Co., Ltd. based on its own funding needs.

II. Plans for changes in shares over the next 12 months by the party with information disclosure obligations

According to the “Announcement on the Share Reduction Plan of a Shareholder Holding More Than 5% of Leshengtongling” disclosed by the Company on 13 02 2026 (Announcement No. 2026-011), the party with information disclosure obligations plans, within 3 months after the 15 trading days from the date of publication of this announcement (17 03 2026), to reduce the Company’s shares by no more than 1.00% through centralized bidding, and by no more than 2.00% through block trades, for a total reduction of no more than 3% of the Company’s total share capital.

Except for the above disclosed reduction plan, within the next 12 months, the party with information disclosure obligations plans to continue reducing the shares in which it holds interests in the Company, with no plan to increase the shares in which it holds interests in the Company. If any relevant changes in interests occur, the party with information disclosure obligations will strictly comply with the requirements of relevant laws, regulations, and normative documents, and fulfill the relevant approval procedures and information disclosure obligations.

Chapter IV Method of the Change in Interests

Prior to and after this change in interests, Eurostar Diamonds (Shanghai) Co., Ltd. holds Leshengtongling shares, all of which are unrestricted tradable shares (RMB ordinary shares).

I. Basic information of the previously disclosed report on changes in interests by the party with information disclosure obligations

On 26 03 2025, Eurostar Diamonds (Shanghai) Co., Ltd. disclosed the “Simplified Report on Changes in Equity Interests of Leshengtongling.” From 09 01 2025 to 25 03 2025, through centralized bidding and block trades, it cumulatively reduced Leshengtongling shares by 7,554,748 shares, and obtained 5,000 shares through centralized bidding transactions. Eurostar Diamonds (Shanghai) Co., Ltd. currently holds 17,156,192 shares of Leshengtongling, representing a shareholding ratio of 5.0023%.

II. Details of this change in interests

On 17 03 2026, Eurostar Diamonds (Shanghai) Co., Ltd. reduced its holding of Leshengtongling shares by 8,000 shares through centralized bidding, as detailed below:

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III. Whether there are any rights restrictions on this reduction

There are no rights restrictions on the Leshengtongling shares involved in this reduction.

Chapter V The transactions of listed company shares in the first six months

In the six months prior to the signing date of this report, the party with information disclosure obligations’ buy-and-sell activities of Leshengtongling shares through centralized bidding and block trades on the securities exchange are as follows:

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Chapter VI Other Major Matters

As of the date of signing this report, the party with information disclosure obligations has, in accordance with relevant regulations, truthfully disclosed relevant information regarding this change in interests. There are no other major matters related to this change in interests, nor other information that must be disclosed to avoid misunderstanding regarding the content of this report. There is also no other information that the China Securities Regulatory Commission or the Shanghai Stock Exchange legally requires to be disclosed but has not been disclosed.

Chapter VII Documents for Reference

I. Documents for reference

1. Business license of the party with information disclosure obligations;

2. The simplified report on changes in equity interests signed by the party with information disclosure obligations;

3. Other documents for reference required to be submitted by the China Securities Regulatory Commission or the securities exchange.

II. Place for keeping

This report and the above-mentioned documents for reference are kept at the location of the listed company for investors to review.

Appendix:

/Simplified Report on Changes in Equity Interests

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Chapter VIII Statement of the party with information disclosure obligations

I undertake that this report contains no false records, misleading statements, or material omissions, and I assume separate and joint legal liability for the authenticity, accuracy, and completeness of this report.

Party with information disclosure obligations: Eurostar Diamonds (Shanghai) Co., Ltd.

18 03 2026

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