T.S.M.C. — Proxy Solicitation & Information Statement 2024

Jun 13, 2024

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Taiwan Styrene Monomer Corporation

Meeting Notice of the 1[st] Special Shareholders’ Meeting for 2024 (Summary Translation)

• I. The 1[st] Special Shareholders' Meeting for 2024 (the “Meeting”) of Taiwan Styrene Monomer Corporation (the “Company”) will be convened at 9:30 a.m. on Friday, March 15, 2024 (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. Matters for Discussion

   • The Company's proposal for cash capital increase by private placement of common stock

2. Extemporary Motions

• II. The Company’s proposal for cash capital increase by private placement of common stock, please refer to the attachment of meeting handbook.

• III. 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.

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

• V. 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 February 27, 2024. Investors may visit SFI's website at https://free.sfi.org.tw and search for proxy details for free.

• VI. 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://mops.twse.com.tw) and go to Electronic Books > Shareholders' meetings to search for more details.

• VII. Shareholders could exercise their voting rights through STOCKVOTE platform of Taiwan Depository & Clearing Corporation (https://stockservices.tdcc.com.tw) during the period from February 29, 2024 to March 12, 2024.

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.