Formosa Chemicals & Fibre Corporation Announces Consolidated Revenue for May 2026

1. Date of occurrence: June 8, 2026 2. Company name: Formosa Chemicals & Fibre Corporation 3. Relationship with the company: The company itself 4. Shareholding ratio: Not applicable 5. Reason for occurrence: Announcement of consolidated revenue for May 2026: NT$27,386,895 thousand 6. Countermeasures: None 7. Other matters to be stated: I. Comparison of consolidated revenue for May 2026 with April 2026: (1) Consolidated revenue for May 2026 was NT$27,386.9 million, compared to NT$32,101.07 million for April 2026, a decrease of NT$4,710 million, or 14.7%. Volume variance contributed a decrease of NT$4,310 million, and price variance contributed a decrease of NT$400 million. (2) Sales volume: A. Formosa Chemicals & Fibre (Taiwan): Decrease of NT$3,680 million Annual scheduled maintenance at the Mailiao ARO-3 and SM-2 plants affected external sales of PX, SM, and raffinate oil sold back to Formosa Petrochemical, totaling a decrease of NT$2,600 million. For PS, ABS, and PP, downstream customers were generally cautious due to high prices that could not be passed on or rapid market fluctuations, purchasing only on a need basis, resulting in a total decrease of NT$850 million. B. Formosa Chemicals & Fibre (Ningbo): Decrease of NT$540 million Scheduled maintenance at the PTA-6 plant affected production and sales, decreasing by NT$520 million. For PS, ABS, and PIA, customers could not smoothly pass on high raw material costs or expected further price declines, leading to conservative purchasing, impacting sales by NT$390 million. However, external sales of phenol and raffinate oil increased by NT$360 million in response to market conditions and inventory. C. Other subsidiaries: Formosa Taffeta decreased by NT$130 million, mainly due to geopolitical and tariff risks causing conservative ordering by long-fiber brand customers. Meanwhile, Taiwan Acetate increased by NT$230 million as some orders were postponed to May to align with customer shipping schedules. (3) Selling prices: Due to fluctuating progress in US-Iran peace talks, oil prices were weak and volatile, customers placed orders cautiously, and some competitors engaged in price cuts, causing petrochemical and plastic product prices to decline weakly. II. Comparison of consolidated revenue for May 2026 with May 2025: (1) Consolidated revenue for May 2026 was NT$27,386.9 million, compared to NT$23,721.26 million for May 2025, an increase of NT$3,670 million, or 15.5%. Volume variance contributed a decrease of NT$4,040 million, and price variance contributed an increase of NT$7,710 million. (2) Sales volume: A. Formosa Chemicals & Fibre (Taiwan): Decrease of NT$2,800 million Due to poor market conditions, customers reduced operations and purchased on a need-only basis, coupled with lean production initiatives, OX, phenol/ketone, PTA, PIA, PS, ABS, and PP decreased by a total of NT$1,470 million. The ARO-3 plant underwent annual maintenance, and sales of PX and raffinate oil to Formosa Petrochemical decreased by a total of NT$1,180 million. B. Formosa Chemicals & Fibre (Ningbo): Decrease of NT$1,160 million Lean production in ABS and customer caution due to falling prices reduced sales by NT$630 million. Scheduled maintenance at PTA-6 affected production and sales, decreasing by NT$410 million. PIA customers could not smoothly pass on high raw material costs, reducing demand and equipment utilization, impacting by NT$210 million. C. Formosa Taffeta: Decrease of NT$130 million Mainly due to inflation and geopolitical risks, long-fiber brand customers reduced orders, and high oil product prices (gasoline, diesel) led to conservative consumer spending. (3) Selling prices: The US-Israel-Iran war caused damage to some petrochemical and energy facilities in the Middle East and blockade of the Strait of Hormuz, leading to higher oil and raw material prices, which drove up product selling prices.