Formosa Pharmaceuticals, Inc. — Proxy Solicitation & Information Statement 2026

1. The Company will hold its 2026 Annual Shareholders' Meeting at 9:00 a.m. on Monday, May 25, 2026, at the AA Conference Room of Primasia Conference & Business Center (15F, No. 99, Fuxing North Road, Taipei City). The main content of the meeting: (1) Reports: 1. The Company's 2025 Business Report. 2. The Company's 2025 Audit Committee's Review Report. 3. The Company's 2025 Directors' Remuneration Report. 4. The Company's 2025 Report on Execution of Related Party Transaction Contracts. 5. Amendment to the Company's "Ethical Corporate Management Best Practice Principles". 6. Amendment to the Company's "Codes of Ethical Conduct". 7. Amendment to the Company's "Sustainable Development Best Practice Principles". 8. Amendment to the Company's "Procedures for Ethical Management and Guidelines for Conduct". 9. Amendment to the Company's "Rules of Procedure for Board of Directors Meetings". (2). Matters for Ratification: 1. The Company's 2025 Financial Statements and Business Report. 2. The Company's 2025 Deficit Compensation Proposal. (3). Matters for Discussion: 1. Amendment to the Company's "Procedures for Acquisition or Disposal of Assets". 2. Amendment to the Company's "Procedures for Endorsement and Guarantee". 3. Amendment to the Company's "Rules for Election of Directors". 4. Amendment to the Company's "Procedures for Loaning of Funds". 5. Amendment to the Company's "Rules of Procedure for Shareholders Meetings". 6. Proposal to Release the Non-Compete Restrictions on the Company's Directors (including Independent Directors). (4). Ad Hoc Motions.

2. If there are matters that require explanation of main content pursuant to Article 172 of the Company Act, they will be posted on the Market Observation Post System website [https://mops.twse.com.tw/Single Company/Electronic Document Download/Annual Reports and Shareholders' Meeting Related Information]. Shareholders may enter the company code and year to search for reference materials, handbooks, and supplementary materials for each proposal of the shareholders' meeting.

3. Enclosed are the attendance notice and proxy form. If you decide to attend in person, please sign or affix your seal on the third copy of the attendance notice (no need to send it back) and bring it to the venue on the meeting day for registration (Shareholder registration begins at 8:30 a.m., the registration area is at the same location as the meeting venue). If you appoint a proxy to attend, please sign or affix your seal on the third copy of the proxy form, fill in the proxy's name, address, and signature or seal, and

deliver it to the Company's stock affairs agent: KGI Securities Co., Ltd. Stock Affairs Department (5F, No. 2, Chongqing South Road Section 1, Taipei City) at least five days before the meeting to facilitate the issuance of an attendance card to the proxy. If you do not receive an attendance card before the meeting, please bring identification documents directly to the venue to apply for a replacement.

1. Shareholders, solicitors, and proxies should bring identification documents when attending the shareholders' meeting for verification purposes.

2. In accordance with Article 26-2 of the Securities and Exchange Act: "For companies that have issued shares pursuant to this Act, the notice of convening a regular shareholders' meeting to shareholders who own less than 1,000 registered shares may be given in the form of a public announcement 30 days prior to the meeting." Therefore, no separate notice will be sent.

3. Shareholders may exercise their voting rights by electronic means for this shareholders' meeting. The exercise period is from April 25, 2026, to May 22, 2026. Please log in to the "Stock Service" electronic voting platform of Taiwan Depository & Clearing Corporation [Website: https://stockservices.tdcc.com.tw] and vote according to the relevant instructions.

4. The statistical verification institution for the proxies of this shareholders' meeting is KGI Securities Co., Ltd. Stock Affairs Department.

5. If there is any solicitation of proxies for this Annual Shareholders' Meeting, the Company will upload a summary table of the solicitor's solicitation information to the website of the Securities and Futures Institute (https://free.sfi.org.tw) before April 24, 2026. Please refer to the instructions on the website for the inquiry method.

6. No souvenirs will be distributed at this Annual Shareholders' Meeting.

To

Our Esteemed Shareholders

Board of Directors, Formosa Pharmaceuticals, Inc.