Formosa Plastics Announces Consolidated Operating Revenue for April 2026

1. Date of occurrence of the event: May 7, 2026 (115/05/07 according to ROC calendar) 2. Company name: Formosa Plastics Corporation 3. Relationship with the company (please enter 'our company' or 'subsidiary'): Our company 4. Shareholding ratio: Not applicable 5. Reason for occurrence: Announcement of our company's consolidated operating revenue for April 2026 6. Countermeasures: None 7. Other matters that need to be specified (If the subject of the event or resolution is a public offering company or above, this material information also complies with Article 7, Paragraph 9 of the Enforcement Rules of the Securities Exchange Act regarding matters that have a significant impact on shareholders' equity or securities prices): I. Comparison of consolidated operating revenue for April 2026 with March 2026: Consolidated operating revenue for April 2026 was NT$18.326 billion. Compared with March 2026, it increased by NT$971.88 million, a growth of 5.6%. The explanation is as follows: 1. Increase in sales price difference: NT$4.23 billion: The ongoing US-Iran conflict led to an increase in crude oil and light oil prices, driving up ethylene and propylene contract prices by 23% in April 2026 compared to March. This pushed up petrochemical product prices. Therefore, the average price of our company's major products in April 2026 increased compared to March 2026, with magnitudes ranging from 20-55%. 2. Decrease in sales volume difference: NT$3.26 billion: The US-Iran conflict resulted in the blockade of the Strait of Hormuz, interrupting the supply of crude oil and light oil. CPC Corporation and Formosa Petrochemical Corporation supplied ethylene and propylene raw materials at a discount, leading to a reduction in our company's product output. We prioritized meeting the demand of domestic downstream processing customers. Therefore, the total sales volume of our company's major products in April 2026 decreased by 97,000 metric tons compared to March 2026. II. Comparison of consolidated operating revenue for April 2026 with April 2025: Consolidated operating revenue for April 2026 was NT$18.326 billion. Compared with April 2025, it increased by NT$2.153 billion, a growth of 13.3%. The explanation is as follows: 1. Increase in sales price difference: NT$4.21 billion: The US-Iran conflict raised the risk of global petrochemical supply chain disruption. Downstream customers, concerned about material shortages, actively procured. Coupled with surging crude oil, ethylene, and propylene prices, we adjusted selling prices in phases to reflect costs. Therefore, the prices of our company's major products in April 2026 increased compared to the same period last year, with magnitudes ranging from 21-59%. 2. Decrease in sales volume difference: NT$2.06 billion: The US-Iran conflict led to the interruption of crude oil and light oil supply from the Middle East. CPC Corporation and Formosa Petrochemical Corporation supplied ethylene and propylene raw materials at a discount, affecting our company's product operating rates. Therefore, the total sales volume of our company's major products in April 2026 decreased by 77,000 metric tons compared to the same period last year.