TST Group — AGM Information 2026

May 14, 2026

Notice for the Convention of Annual General Meeting (Summary Translation)

The 2026 Annual General meeting with physical type of the shareholders of TST Group Holding Ltd. (the "Company") will be convened at 9:00 a.m., June 17, 2026 at the Conference, 2F, No. 99, Fuxing North Road, Songshan District, Taipei City (Primasia Conference & Business Center). In addition, the registration of the shareholders will start at 8:30 a.m. at the venue of the meeting.

I. The agenda for the Meeting is as follows:

1. Report Items:
   (1) 2025 Operating Results
   (2) Audit Committee’s Review Report
   (3) Report on status of 2025 distribution of remunerations to employees and directors
   (4) Amendment of some articles of Sustainable Development Best Practice Principles
   (5) Status of the Company’s Share Repurchase

2. Ratification Items:
   (1) The 2025 consolidated financial statements and report of operating results are submitted for ratification
   (2) Distribution of Earnings for 2025

3. Discussion Items:
   (1) Amendment of some articles of Articles of Incorporation (By way of a Special Resolution)
   (2) Amendment of some articles of Rules of Procedure for Shareholders Meetings
   (3) Amendment of some articles of Regulations Governing the Acquisition or Disposal of Assets
   (4) Shareholder proposal: Increase the cash dividend per share to NT$4.6 or above

4. Extempore motions

II. The main content of dividend distribution:
Distribute cash dividends of NT$152,448,748, and it is expected to distribute NT$4 per share.

III. In accordance with Article 17.5 of the Articles of Incorporation, the main content shall be published on the Market Observation Post System, available at http://mops.twse.com.tw.

IV. Please sign or seal in the "Attendance Card" while you want to attend the meeting in person. Shareholder may sign or seal in the "Proxy Statement" to appoint a proxy in writing to attend the meeting on his or her behalf by executing a power of attorney. Please send out such written "Proxy Statement" to the Company's Stock Affairs Agency, Stock Affairs Agency Department of CTBC Bank, no later than five days prior to the meeting date for processing the "Attendance Card" to the proxy agent.

Note to Readers:
If there is any conflict between the English version and the original Chinese version or any difference in the interpretation of the two versions, the Chinese-language version shall prevail.

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V. If shareholders solicit proxies for the Annual General Meeting, the Company will compile a summary statement of proxy solicitation and disclose it in the website of Securities & Futures Institute (SFI) on May 15, 2026. Investors can access SFI's website (https://free.sfi.org.tw) for relevant information.

VI. This (2026) Annual General Meeting will adopt electronic voting as one of the methods for shareholders to vote for resolutions. For voting on-line, the electronic voting platform of Taiwan Depositary and Clearing Corporation will be available at https://stockservices.tdcc.com.tw from May 18, 2026 to June 14, 2026. Please log in and vote in accordance with the instructions.

VII. New shareholder who intends to submit shareholder seal card can download the seal card for use from the website of the Company's stock agency, CTBC Bank Corporate Trust.

VIII. The proxies of the Annual General Meeting shall be tallied and verified by the Transfer Agency Department of CTBC Bank.

IX. Please execute as above-mentioned.

To Shareholder

Board of Directors of TST Group Holding Ltd.

Note to Readers:

If there is any conflict between the English version and the original Chinese version or any difference in the interpretation of the two versions, the Chinese-language version shall prevail.