Shenzhen Tongxingda Technology Co., Ltd. Progress Announcement on Providing Guarantees for Subsidiaries

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Stock Code: 002845 Stock Abbreviation: Tongxingda Announcement No.: 2026-009

Shenzhen Tongxingda Technology Co., Ltd.

Announcement on the Progress of Providing Guarantees for Subsidiaries

The company and all members of the board of directors guarantee that the content of the information disclosure is true, accurate, and complete, with no false records, misleading statements, or major omissions.

Special Risk Warning:

Shenzhen Tongxingda Technology Co., Ltd. (hereinafter referred to as “Tongxingda” or “the Company”) and its subsidiaries have provided guarantees totaling over 100% of the latest audited net assets within the scope of the consolidated financial statements, for guaranteed entities with a debt-to-asset ratio exceeding 70%. Investors should pay full attention to the guarantee risks.

I. Overview of Guarantee Situation

Tongxingda held the 20th meeting of the 4th board of directors on January 16, 2026, and the first extraordinary general meeting of shareholders in 2026 on February 3, 2026, to review and approve the proposal on the guarantee limits the company intends to provide to subsidiaries in 2026. The company agreed to provide a total bank credit guarantee not exceeding RMB 6.2 billion for the daily operational matters of its subsidiaries; and a performance guarantee not exceeding RMB 650 million; with a total guarantee limit not exceeding RMB 6.85 billion.

The company authorized the management to sign relevant business contracts and other legal documents within the above guarantee limits, without the need to convene another board or shareholders’ meeting. The above matters are valid from the approval by the first extraordinary general meeting of shareholders in 2026 until the 2026 annual general meeting approves the new guarantee limit application. The above guarantee limits can be reused within the valid guarantee period. For specific details, please refer to the announcement on the guarantee limits the company intends to provide to subsidiaries disclosed on January 17, 2026, on the Giant Tide Information Network (www.cninfo.com.cn) and other designated information disclosure media (Announcement No.: 2026-004).

II. Progress of Guarantees

1. Recently, the company signed two “Maximum Guarantee Contracts” with China Everbright Bank Co., Ltd. Shenzhen Branch (referred to as “Everbright Bank Shenzhen Branch”), providing a financing credit guarantee not exceeding RMB 10 million for its subsidiary Nanchang Tongxingda Automotive Electronics Co., Ltd. (referred to as “Nanchang Automotive”); and a financing credit guarantee not exceeding RMB 20 million for its subsidiary Kunshan Riyue Tongxin Semiconductor Co., Ltd. (referred to as “Riyue Tongxin”).

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Note: There may be rounding errors in some of the data in this table. The latest period in the table refers to September 30, 2025, and is unaudited. The guaranteed parties in the table are not dishonest executors.

III. Basic Information of the Guaranteed Parties

(1) Information on the Guaranteed Party

1. Kunshan Riyue Tongxin Semiconductor Co., Ltd.

Date of establishment: 2021-12-06

Legal representative: Wan Feng

Address: No. 497, Huangpujiang South Road, Qiantang Town, Kunshan City

Registered capital: RMB 990 million

Business scope: Technical services, technical development, technical consulting, technical exchanges, technology transfer, technology promotion; manufacturing of integrated circuit chips and products; manufacturing of semiconductor device special equipment; manufacturing of power electronic components; manufacturing of electronic components; manufacturing of semiconductor discrete devices; manufacturing of other electronic devices; wholesale of electronic components; sales of power electronic components; sales of semiconductor device special equipment; sales of semiconductor discrete devices; manufacturing of electronic special equipment; sales of electronic products; sales of integrated circuit chips and products; sales of integrated circuits; design and services of integrated circuit chips; professional design services; industrial design services; import and export of goods; import and export of technology (except for projects that require approval according to law, conducting business activities independently according to business licenses)

Equity structure: Riyue Tongxin is a holding subsidiary of the company, with the company holding 75.76% of its shares.

2. Nanchang Tongxingda Automotive Electronics Co., Ltd.

Date of establishment: 2022-04-18

Legal representative: Deng Xinqiang

Registered address: 11th Floor, R&D Building 1-7#, Technology Collaborative Innovation Park, No. 999 Xiuxian Road, Nanchang Economic and Technological Development Zone, Jiangxi Province

Registered capital: RMB 70 million

Business scope: General projects: manufacturing of intelligent in-vehicle equipment, sales of intelligent in-vehicle equipment, R&D of automotive components, wholesale of electronic components, retail of electronic components, manufacturing of optical instruments, sales of optical instruments, manufacturing of molds, sales of molds, design and services of integrated circuit chips, sales of integrated circuit chips and products, software development, manufacturing of automotive components and accessories, R&D of electronic special materials, leasing of machinery and equipment, import and export of goods, import and export of technology, technical services, technical development, technical consulting, technical exchanges, technology transfer, technology promotion (except for licensed businesses, can independently operate projects that are not prohibited or restricted by laws and regulations)

Equity structure: Nanchang Automotive is a wholly-owned subsidiary of the company, with the company holding 100% of its shares.

(2) Financial Status of the Guaranteed Parties:

The financial status of the guaranteed parties as of December 31, 2024, is as follows (audited):

Unit: RMB 10,000

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The financial status of the guaranteed parties as of September 30, 2025, is as follows (unaudited):

Unit: RMB 10,000

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IV. Main Contents of the Guarantee Agreement

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V. Opinion of the Board of Directors

This guarantee is provided to ensure the sustained and healthy development of the production and operation of subsidiaries, which helps to improve their operational efficiency and financing capacity. The guaranteed entities are wholly-owned and controlling subsidiaries of the company, with financial risks within the company’s controllable range; therefore, no counter-guarantee has been provided. Furthermore, the operational status of the guaranteed entities is normal, possessing actual debt repayment capability, with no circumstances that would harm the interests of the company and its shareholders, especially minority shareholders.

VI. Cumulative Number of External Guarantees and Number of Overdue Guarantees

1. As of the date of this announcement, the total amount of external guarantees reviewed by the company for 2026 is RMB 685 million (including this guarantee), accounting for 249.88% of the company’s audited net assets as of December 31, 2024.

2. As of the date of this announcement, all external guarantees provided by the company are guarantees for its subsidiaries. The actual total amount of guarantees provided to subsidiaries by the company is RMB 2,103.0764 million, accounting for 76.72% of the company’s most recent audited net assets.

3. The company has no overdue guaranteed loans, no guarantee amounts involved in litigation, and no loss amounts that should be borne due to being judged against guarantees.

VII. Documents for Reference

1. Two “Maximum Guarantee Contracts” signed by the company with Everbright Bank Shenzhen Branch;

This announcement is hereby made.

Shenzhen Tongxingda Technology Co., Ltd.

Board of Directors

March 26, 2026

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