T.S.M.C. — AGM Information 2023

Jun 9, 2023

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Taiwan Styrene Monomer Corporation

Meeting Notice for 2023 Annual Shareholders’ Meeting

(Summary Translation)

• I. The 2023 Annual Shareholders’ Meeting (the “Meeting”) of Taiwan Styrene Monomer Corporation (the “Company”) will be convened at 9:30 a.m. on Tuesday, May 30, 2023 (shareholder registration will start at 9:00 a.m. at the venue of the meeting) at Conference Room on the 8th floor, International Convention Center of Chang Yung-Fa Foundation (No.11, Zhongshan S. Rd., Zhongzheng Dist., Taipei City, Taiwan) .

Shareholders' meeting will be held by means of Physical Shareholders' Meeting.

The agenda for the Meeting is as follows:

1. Report Items

2. (1) 2022 Business Report

3. (2) 2022 Audit Committee’s Review Report

4. (3) To Report 2022 Earnings Distribution

5. Adoption Items

6. (1) To Adopt 2022 Business Report and Financial Statements

7. (2) To Approve the Proposal for Distribution of 2022 Earnings

8. Election matters

The By-election of Independent Director

1. Extemporary Motions

2. II. Stock dividend: Cash dividend NT$105,573,953, with NT$0.2 per share.

3. III. There will be a by-election for one Independent Director at the Shareholders' Meeting.

4. IV. The Candidate List is as follows:

Independent Director: Tzu-Meng Liu

Please refer to Market Observation Post System at “https://mops.twse.com.tw” for the education background and experience of the aforesaid candidate.

• V. Enclosed please find the sign-in card and the proxy form. If you wish to attend the meeting in person, please sign or seal the sign-in card and present it at the registration desk at the meeting venue on the day of the meeting; if you wish to attend the meeting by proxy, please specify the name and address of the proxy, sign or seal the proxy form, and mail or deliver it to the Company's shareholder services agent five days before the shareholders' meeting: Yuanta Securities Registrar and Transfer Agency Department (B1, No. 210, Section 3, Chengde Road, Taipei 103432, Taiwan) so that a sign-in card can be mailed out to the proxy.

• VI. The Company has appointed Yuanta Securities Registrar and Transfer Agency Department to tally and verify the proxy forms collected for this shareholders' meeting.

• VII. If any shareholder requires solicitation of a proxy to attend the meeting, the Company will compile a summary statement of the solicitor and solicitation information for disclosure on the website of the Securities and Futures Institute (SFI) on April 28, 2023. Investors may visit SFI's website at https://free.sfi.org.tw and search for proxy details for free.

• VIII. Where the subject of the shareholders' meeting to be convened includes any contents that shall be explained in accordance with Article 172 of the Company Act, please visit the English website of the Market Observation Post System (MOPS) (https://emops.twse.com.tw/) and go to Electronic Books > Shareholders' meetings to search for more details.

• IX. Shareholders could exercise their voting rights through STOCKVOTE platform of Taiwan Depository & Clearing Corporation (https://www.stockvote.com.tw) during the period from April 30, 2023 to May 27, 2023.

• X. Should the Company have to change the venue of the shareholders' meeting due to the impact of the COVID-19 pandemic, announcements will be made on the Market Observation Post System (MOPS) website under the Material Information > Material Information Today section.

Sincerely,

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Board of Directors

Taiwan Styrene Monomer Corporation

This document is prepared in accordance with the Chinese version and is for reference only. In the event of any discrepancy between the English version and the Chinese version, the Chinese version shall prevail.