Hangzhou Foster Application Materials Co., Ltd. Announcement on Repayment of Temporary Additional Working Capital from Raised Funds

Securities Code: 603806 Securities Abbreviation: Foster Announcement Number: 2026-008

Convertible Bond Code: 113661 Convertible Bond Abbreviation: Fu 22 Convertible Bond

Hangzhou Foster Applied Materials Co., Ltd.

Announcement on the Return of Raised Funds for Temporary Supplementary Working Capital

The Board of Directors of the company and all directors guarantee that there are no false records, misleading statements, or major omissions in the content of this announcement, and assume legal responsibility for the truthfulness, accuracy, and completeness of its content.

Important Content Reminder:

● As of March 18, 2026, the company has returned a total of RMB 875 million of idle raised funds for temporary supplementary working capital.

I. Situation of Raised Funds for Temporary Supplementary Working Capital

Hangzhou Foster Applied Materials Co., Ltd. (hereinafter referred to as “the company”) held the fifth meeting of the sixth Board of Directors on March 20, 2025, and approved the proposal on the return of raised funds and the continued use of raised funds for temporary supplementary working capital, agreeing that the company would temporarily use no more than RMB 1 billion of idle raised funds from the “Fu 22 Convertible Bond” for supplementary working capital, with a usage period not exceeding 12 months from the date of approval by the Board of Directors. The Supervisory Board and the sponsor institution expressed clear agreement. For detailed content, please refer to the announcement titled “Foster: Announcement on the Return of Raised Funds and Continued Use of Raised Funds for Temporary Supplementary Working Capital” disclosed by the company on the Shanghai Stock Exchange website on March 21, 2025 (Announcement Number: 2025-015).

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II. Relevant Situation of Returning Raised Funds

On March 18, 2026, the company returned RMB 360 million from the raised funds temporarily used for supplementary working capital to the special account for raised funds and promptly notified the sponsor institution and the sponsoring representative of the return of the raised funds.

As of the date of this announcement, the company has returned all of the previously temporarily used idle raised funds of RMB 875 million to the special account for raised funds, with no raised funds remaining unpaid, and the usage period has not exceeded 12 months.

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This announcement is hereby made.

Board of Directors of Hangzhou Foster Applied Materials Co., Ltd.

March 19, 2026

Securities Code: 603806 Securities Abbreviation: Foster Announcement Number: 2026-009

Convertible Bond Code: 113661 Convertible Bond Abbreviation: Fu 22 Convertible Bond

Hangzhou Foster Applied Materials Co., Ltd.

Progress Announcement on the Use of Idle Raised Funds for Cash Management

The Board of Directors of the company and all directors guarantee that there are no false records, misleading statements, or major omissions in the content of this announcement, and assume legal responsibility for the truthfulness, accuracy, and completeness of its content.

Hangzhou Foster Applied Materials Co., Ltd. (hereinafter referred to as “the company”) held the sixth meeting of the sixth Board of Directors on April 8, 2025, and approved the proposal on the use of part of the temporarily idle raised funds for cash management, agreeing that the company and its subsidiaries, while ensuring that it does not affect the implementation of the investment projects funded by raised funds and the safety of raised funds, may use a total amount not exceeding RMB 1 billion of temporarily idle raised funds for cash management, for purchasing investment products that have high safety, good liquidity, and are able to provide principal protection commitments from the product issuers. The Supervisory Board of the company expressed clear agreement, and the company’s sponsor institution, Guotai Junan Securities Co., Ltd., provided verification opinions. For specific content, please refer to the announcement titled “Foster: Announcement on the Use of Part of the Temporarily Idle Raised Funds for Cash Management” disclosed by the company on the Shanghai Stock Exchange website on April 10, 2025 (Announcement Number: 2025-027).

I. Redemption of Previous Cash Management of Raised Funds Upon Maturity

The company previously purchased a revenue certificate “Revenue Treasure” No. 4 from GF Securities Co., Ltd. for RMB 90 million, detailed in the progress announcement titled “Foster: Progress Announcement on the Use of Part of the Temporarily Idle Raised Funds for Cash Management” disclosed by the company on December 18, 2025 (Announcement Number: 2025-079). The aforementioned financial product reached the redemption conditions, and on March 18, 2026, the principal of RMB 90 million was received, along with financial returns of RMB 621,400; these funds have all been returned to the special account for raised funds (bank account number: 95080078801400004443). The specific situation is as follows:

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II. As of the date of this announcement, the situation of the company’s use of raised funds for cash management in the last twelve months

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This announcement is hereby made.

Board of Directors of Hangzhou Foster Applied Materials Co., Ltd.

March 19, 2026

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