T.S.M.C. — AGM Information 2022

Aug 8, 2022

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Taiwan Styrene Monomer Corporation

Notice of 2022 Annual General Shareholders’ Meeting

• I. The 2022 Annual General Shareholders’ Meeting (the “Meeting”) of Taiwan Styrene Monomer Corporation (the “Company”) will be convened at Howard Plaza Hotel Kaohsiung (NO. 311, Chi-Hsien 1st Road, Xinxing Dist., Kaohsiung City, Taiwan) at 9:30 a.m. on Wednesday, June 22, 2022 (shareholder registration will start at 9:00 a.m. at the venue of the meeting) .

The agenda for the Meeting is as follows:

1. Report Items

   • (1) 2021 Business Report

   • (2) Audit Committee’s Review Report

   • (3) To report 2021 Employees’ Profit Sharing Bonus and Directors’ Compensation

   • (4) To report 2021 Earning Distribution and Cash Dividends

2. Adoption Items

   • (1) To Adopt 2021 Business Report and Financial Statements

   • (2) To Adpot 2021 Earnings Distribution Proposal

3. Discussion Items

   • (1) To Amend the Articles of Incorporation

   • (2) To Approve the Procedures for the Handing of Derivatives Trading

   • (3) To Amend the Procedures for Acquisition or Disposal of Assets

   • (4) To Amend the Rules of Procedures of Shareholders’ Meeting

4. Extemporary Motions

• II. Stock dividend: Cash dividend NT$79,180,465, with NT$0.15 per share.

• 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 May 20, 2022. 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://emops.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://www.stockvote.com.tw) during the period from May 23, 2022 to June 19, 2022.

• VIII. 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.