Formosa Petrochemical Announces Consolidated Revenue for June 2026

Announcement Date: July 10, 115 Statement Date: July 9, 115 Statement Time: 14:30:10 Company Code: 6505 Company Name: Formosa Petrochemical Subject: Announcement of consolidated revenue for June 2026 Applicable Clause: Item 51 Event Date: July 9, 115

Details: 1. Event Date: 07/09/115 2. Company Name: Formosa Petrochemical Corporation 3. Relationship with Company (Please enter '本公司' or 'Subsidiary'):本公司 4. Cross-shareholding Ratio: Not applicable 5. Reason for Announcement: Announcement of consolidated revenue for June 2026 6. Response Measures: None 7. Other Matters to be Disclosed:

I. Comparison of consolidated revenue for June 2026 with May 2026: Consolidated revenue for June 2026 was NT$63.68334 billion, an increase of NT$5.90612 billion (10.2%) compared to NT$57.77722 billion in May 2026. Breakdown: Sales price variance decreased by NT$11.50 billion, while sales volume variance increased by NT$17.41 billion.

(1) Refining business revenue increased by 18.0% month-over-month. Sales Volume: Crude oil refining volume in June 2026 was 14,017 thousand barrels (467 thousand barrels/day, 30 days), up 2,500 thousand barrels from 11,517 thousand barrels (372 thousand barrels/day, 31 days) in the previous month, primarily due to completion of scheduled maintenance at refinery units in May and continued crude oil deliveries. Total product sales volume was 14,143 thousand barrels, up 3,482 thousand barrels from 10,661 thousand barrels in the previous month. Sales Price: Following initial consensus in U.S.-Iran negotiations, international oil prices gradually declined. The average Dubai crude oil price in June 2026 was USD 79.5/barrel, down USD 23.6/barrel from the previous month, resulting in an average product selling price decrease of USD 23.5/barrel.

(2) Olefins business revenue decreased by 32.2% month-over-month. Sales Volume: Ethylene production in June 2026 was 90,600 metric tons (capacity utilization rate 34%, 30 days), slightly up from 90,500 metric tons (33%, 31 days) in the previous month. Total product sales volume was 184,800 metric tons, down 41,800 metric tons from 226,600 metric tons in the previous month. Sales Price: The average MOPJ naphtha price in June 2026 was USD 725/ton, down USD 263/ton from the previous month. The average price of the four major products decreased by USD 272/ton (ethylene -309, propylene -239, butadiene -274, pyrolysis gasoline -237 USD/ton).

(3) Utility business revenue decreased by 4.2% month-over-month, primarily due to scheduled maintenance and fewer operating days, resulting in lower electricity sales.

II. Comparison of consolidated revenue for June 2026 with June 2025: Consolidated revenue for June 2026 was NT$63.68334 billion, an increase of NT$9.9255 billion (18.5%) compared to NT$53.75784 billion in June 2025. Breakdown: Sales price variance increased by NT$20.38 billion, while sales volume variance decreased by NT$10.46 billion.

(1) Refining business revenue increased by 34.3% year-over-year. Sales Volume: Crude oil refining volume in June 2026 was 14,017 thousand barrels (467 thousand barrels/day), down 522 thousand barrels from 14,539 thousand barrels (485 thousand barrels/day) in the same period last year. Total product sales volume was 14,143 thousand barrels, down 2,101 thousand barrels from 16,244 thousand barrels, primarily due to shipping schedule impacts and deferred export shipments from the previous year. Sales Price: The average Dubai crude oil price in June 2026 was USD 10.2/barrel higher than the same period last year. Combined with a significant widening of export product price spreads over crude oil, the average product selling price increased by USD 37.0/barrel year-over-year.

(2) Olefins business revenue decreased by 38.2% year-over-year. Sales Volume: Ethylene production in June 2026 was 90,600 metric tons (capacity utilization rate 34%), down 67,200 metric tons from 157,800 metric tons (60%) in the same period last year. Total product sales volume was 184,800 metric tons, down 223,800 metric tons year-over-year. Sales Price: The average MOPJ naphtha price in June 2026 was USD 137/ton higher than the same period last year. The average price of the four major products increased by USD 222/ton (ethylene +211, propylene +270, butadiene +336, pyrolysis gasoline +195 USD/ton) year-over-year.

(3) Utility business revenue decreased by 11.5% year-over-year, primarily due to lower electricity and steam sales volumes compared to the same period last year.