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

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Stock Code: 002845 Stock Abbreviation: Tongxingda Announcement No.: 2026-008

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

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

Special Risk Reminder:

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

1. 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 2026 on February 3, 2026, during which the proposal on “The Company’s Proposed Guarantee Limit for 2026” was approved. The Company agreed to provide a total credit guarantee of no more than RMB 6.2 billion from banks and other financial institutions for daily operations of its subsidiaries; and a performance guarantee of no more than RMB 650 million; with a combined total limit of RMB 6.85 billion.

The company authorizes management to sign relevant business contracts and other legal documents within these guarantee limits without convening additional board or shareholder meetings. These matters are valid from the approval of the first extraordinary general meeting of 2026 until the approval of new guarantee limits by the shareholders’ meeting in 2026. The guarantees within these limits can be used cyclically during the valid guarantee period. Details are disclosed in the company’s announcement titled “Proposal on Guarantee Limit for Subsidiaries in 2026” published on CNINFO (www.cninfo.com.cn) on January 17, 2026 (Announcement No.: 2026-004).

2. Progress of Guarantees

3. Recently, the company signed a “Quick Pay Business Cooperation Agreement” with the Shenzhen Branch of Bank of Communications Co., Ltd., and Shenzhen Qianhai Huanrong Lianyi Technology Service Co., Ltd. (“Huanrong Lianyi”). Under the agreement, during the cooperation period, subsidiaries confirmed in the “Core Enterprise List” can cooperate with Shenzhen Bank of Communications and Huanrong Lianyi for supply chain financing. The company, as a joint buyer, will assume unconditional payment obligations to Shenzhen Bank of Communications for digital debt certificates issued on the platform operated by Huanrong Lianyi, with a limit not exceeding RMB 250 million.

4. The company signed a “Maximum Guarantee Contract” with Suzhou Branch of Bank of Ningbo, providing a maximum financing guarantee of up to RMB 50 million for its subsidiary Kunshan Sun Moon Tongxin Semiconductor Co., Ltd. (“Sun Moon Tongxin”).

5. The company signed a “Guarantee Contract” with Shili Xincun Branch of Nanchang Rural Commercial Bank, providing a maximum financing guarantee of RMB 10 million for its subsidiary Nanchang Tongxingda Automotive Electronics Co., Ltd. (“Nanchang Auto”).

6. The company signed a “Maximum Guarantee Contract” with Ganzhou Branch of Shanghai Pudong Development Bank, providing a maximum guarantee of RMB 10 million for its subsidiary Ganzhou Zhanhong New Material Technology Co., Ltd. (“Zhanhong New Material”).

Note: Some data in this table may have minor discrepancies due to rounding. The latest audited period is as of September 30, 2025. The guaranteed parties are not dishonestly executed persons.

3. Basic Information of the Guarantor

(1) Guarantor: Kunshan Sun Moon Tongxin Semiconductor Co., Ltd.

Established: December 6, 2021

Legal Representative: Wan Feng

Address: No. 497, South Huangpu River Road, Qian Deng Town, Kunshan City

Registered Capital: RMB 990 million

Business Scope: Technical services, development, consulting, exchange, transfer, promotion; manufacturing of integrated circuit chips and products; manufacturing of semiconductor device equipment; manufacturing of power electronic components; manufacturing of electronic components; manufacturing of discrete semiconductor devices; wholesale of electronic components; sales of power electronic components; sales of semiconductor device equipment; sales of discrete semiconductor devices; manufacturing of electronic special equipment; sales of electronic products; sales of integrated circuit chips and products; design and services of integrated circuits; professional design services; industrial design services; import and export of goods and technologies (excluding items requiring approval, operating independently with business #楼研发楼9层及1-3# license).

Ownership Structure: Sun Moon Tongxin is a controlling subsidiary of the company, holding 75.76% of its equity.

(2) Nanchang Tongxingda Precision Optoelectronics Co., Ltd.

Established: September 8, 2017

Legal Representative: Liang Fuhua

Address: No. 999, Xiuxian Road, Nanchang Economic and Technological Development Zone, Nanchang, Jiangxi Province

Registered Capital: RMB 490.7563 million

Business Scope: Manufacturing, sales, and technical services of optical components; machinery equipment leasing; manufacturing of precision molds; wholesale and retail of electronic products and testing equipment; import and export of goods and technologies (with approval where required).

Ownership Structure: Fully owned subsidiary of the company, holding 100% of its equity.

(3) Ganzhou Tongxingda Electronic Technology Co., Ltd.

Established: August 23, 2011

Legal Representative: Wan Feng

Address: No. 168, Weiyi Road, Ganzhou Economic and Technological Development Zone, Ganzhou, Jiangxi Province

Registered Capital: RMB 1.3 billion

Business Scope: R&D, production, processing, and sales of electronic products; domestic trade; import and export of goods and technologies (excluding items requiring approval).

Ownership Structure: Fully owned subsidiary of the company, holding 100% of its equity.

(4) Ganzhou Zhanhong New Material Technology Co., Ltd.

Established: June 22, 2017

Legal Representative: Chen Baozhang

Address: No. 109, Gantong Avenue, Ganzhou Economic and Technological Development Zone, Ganzhou, Jiangxi Province

Registered Capital: RMB 15 million

Business Scope: Import and export of goods (with approval where required); R&D of electronic special materials; manufacturing and sales of optical instruments, optical glass, and related products; manufacturing and sales of electronic special materials; manufacturing and sales of display devices; procurement agency services; sales agency; technical services, development, consulting, transfer, and promotion (excluding licensed items).

Ownership Structure: Controlled subsidiary of the company, holding 80% of its equity.

(5) Nanchang Tongxingda Automotive Electronics Co., Ltd.

Established: April 18, 2022

Legal Representative: Deng Xinqiang

Address: 11th Floor, R&D Building, No. 999 Xiuxian Road, Nanchang Economic and Technological Development Zone, Nanchang, Jiangxi Province

Registered Capital: RMB 70 million

Business Scope: Manufacturing of intelligent vehicle-mounted devices; sales of such devices; R&D of auto parts; wholesale and retail of electronic components; manufacturing of optical instruments; sales of optical instruments; mold manufacturing and sales; design and sales of integrated circuit chips; software development; manufacturing of auto parts and accessories; R&D of electronic special materials; machinery leasing; import and export of goods and technologies; technical services and transfer (excluding items requiring licensing).

Ownership Structure: Fully owned subsidiary of the company, holding 100% of its equity.

(6) Zhanrui New Material Technology (Zhangjiagang) Co., Ltd. (“Zhanrui New Material”)

Established: January 16, 2024

Legal Representative: Geng Liang

Address: No. 575, Xitang Road, Zhangjiagang, Jiangsu Province

Registered Capital: RMB 8 million

Business Scope: Technical services, development, consulting, transfer, promotion; manufacturing and sales of optical instruments and glass; R&D and manufacturing of electronic special materials; manufacturing and sales of display and optoelectronic devices; processing of mirrors and similar products; procurement and sales agency; import and export of goods (excluding items requiring approval).

Ownership Structure: Controlled subsidiary of Zhanhong New Material, indirectly holding 40.8% of its equity.

(2) Financial Status of the Guarantor:

As of December 31, 2024 (audited):

[Financial data not provided in the excerpt]

As of September 30, 2025 (unaudited):

[Financial data not provided in the excerpt]

4. Main Contents of Guarantee Agreements

[Details not provided in the excerpt]

5. Board Opinions

This guarantee is provided to ensure the sustainable and healthy development of subsidiaries’ production and operations, which can improve their operational efficiency and financing capacity. The guaranteed entities are wholly owned or controlling subsidiaries, with manageable financial risks, so no counter-guarantee is provided. The guaranteed entities are operating normally and have actual debt repayment ability, with no harm to the interests of the company or shareholders, especially minority shareholders.

6. Total External Guarantees and Overdue Guarantees

7. As of this announcement, the total approved external guarantee limit for 2026 is RMB 6.85 billion (including this guarantee), accounting for 249.88% of the company’s audited net assets as of December 31, 2024.

8. All guarantees provided by the company are guarantees to its subsidiaries. The actual guarantee amount for subsidiaries is RMB 2,119.8462 million, accounting for 77.33% of the latest audited net assets.

9. The company has no overdue guarantees, no guarantees involved in litigation, and no losses due to guarantees that have been judged against.

10. Supporting Documents

11. The “Quick Pay Business Cooperation Agreement” signed with Shenzhen Bank of Communications and Huanrong Lianyi.

12. The “Maximum Guarantee Contract” with Ningbo Bank Suzhou Branch.

13. The “Guarantee Contract” with Nanchang Rural Commercial Bank Shili Xincun Branch.

14. The “Maximum Guarantee Contract” with Pudong Development Bank Ganzhou Branch.

This announcement is hereby made.

Shenzhen Tongxingda Technology Co., Ltd.

Board of Directors

March 18, 2026