【Formosa Petrochemical】Announcement of the Company's Consolidated Revenue for April 2026

1. Date of occurrence of the event: 2026/05/07 2. Company name: Formosa Petrochemical Corporation 3. Relationship with the company (please enter 'the company' or 'subsidiary'): The company 4. Mutual shareholding ratio: Not applicable 5. Reason for occurrence: Announcement of the company's consolidated revenue for April 2026 6. Countermeasures: None 7. Other matters that should be specified (if the subject of the event or resolution is a public company or above, this material information simultaneously complies with the provisions of Article 7, Paragraph 9 of the Enforcement Rules of the Securities and Exchange Act regarding matters that have a significant impact on shareholders' equity or securities prices): I. Comparison of April 2026 consolidated revenue with March 2026: The consolidated revenue for April 2026 was NT$61,522.37 million, a decrease of NT$1,798.72 million (2.8%) compared to NT$63,321.09 million in March 2026. Among them: sales price difference increased by NT$9.60 billion, sales volume difference decreased by NT$11.40 billion. (I) Refining business revenue decreased by 3.1% compared to the previous month. In terms of sales volume: In April 2026, due to the full-month scheduled inspection of the second crude distillation unit (CDU#2) and delayed crude oil deliveries caused by the US-Iran conflict, crude oil processing volume was 7,139 thousand barrels (238 thousand barrels/day, 30 days), a decrease of 3,479 thousand barrels compared to 10,618 thousand barrels (343 thousand barrels/day, 31 days) in the previous month. Total product sales volume in April was 9,292 thousand barrels, a decrease of 3,090 thousand barrels compared to the previous month. In terms of sales price: In April 2026, due to the easing of tensions between the US and Iran, the average price of Dubai crude oil was US$105.7/barrel, a decrease of US$22.8/barrel compared to the previous month. However, due to the delayed effect of the Strait of Hormuz blockade, some refineries in Asia and the Middle East were forced to reduce production, leading to a rapid shrinkage in refined oil supply, pushing up spot prices of refined oil. The average price of all products increased by US$35.2/barrel compared to the previous month. (II) Olefins business revenue decreased by 19.0% compared to the previous month. In terms of sales volume: In April 2026, due to continued shortage of naphtha supply, ethylene production was 84 thousand tons (capacity utilization rate 32%, 30 days), a decrease of 46 thousand tons compared to 130 thousand tons (capacity utilization rate 48%, 31 days) in the previous month. Total product sales volume in April was 209 thousand tons, a decrease of 119 thousand tons compared to the previous month. In terms of sales price: In April 2026, the average price of MOPJ naphtha was US$1,053/ton, an increase of US$169/ton compared to the previous month. The average price of the four major products increased by US$307/ton compared to the previous month. Among them, ethylene increased by US$337/ton, propylene by US$258/ton, butadiene by US$496/ton, and pyrolysis gasoline by US$178/ton. (III) Utilities business revenue increased by 4.9% compared to the previous month, mainly due to increases in both electricity sales price and volume. II. Comparison of April 2026 consolidated revenue with April 2025: The consolidated revenue for April 2026 was NT$61,522.37 million, an increase of NT$15,271.76 million (33.0%) compared to NT$46,250.61 million in April 2025. Among them: sales price difference increased by NT$25.82 billion, sales volume difference decreased by NT$10.55 billion. (I) Refining business revenue increased by 47.1% compared to the same period last year. In terms of sales volume: In April 2026, crude oil processing volume was 7,139 thousand barrels (238 thousand barrels/day), a decrease of 4,150 thousand barrels compared to 11,289 thousand barrels (376 thousand barrels/day) in the same period last year, mainly because the second crude distillation unit (CDU#2) was not scheduled for maintenance in the same period last year and due to crude oil deliveries. Total product sales volume was 9,292 thousand barrels, a decrease of 2,332 thousand barrels compared to the same period last year. In terms of sales price: In April 2026, the average price of Dubai crude oil increased by US$38.0/barrel compared to the same period last year. Coupled with a significant increase in the price difference for export oil products due to tight supply, the average price of all products increased by US$77.8/barrel compared to the same period last year. (II) Olefins business revenue decreased by 13.4% compared to the same period last year. In terms of sales volume: In April 2026, ethylene production was 84 thousand tons (capacity utilization rate 32%), a decrease of 71 thousand tons compared to 155 thousand tons (capacity utilization rate 59%) in the same period last year. Also, due to weak downstream demand, total product sales volume was 209 thousand tons, a decrease of 185 thousand tons compared to the same period last year. In terms of sales price: In April 2026, the average price of MOPJ naphtha increased by US$471/ton compared to the same period last year. The average price of the four major products increased by US$590/ton compared to the same period last year, with ethylene increasing by US$613/ton, propylene by US$521/ton, butadiene by US$1,098/ton, and pyrolysis gasoline by US$451/ton. (III) Utilities business revenue decreased by 13.2% compared to the same period last year, mainly due to decreases in both electricity sales volume and steam sales volume.