Formosa Chemicals & Fibre Corporation announced Location Change of the Stock Affair Unit. Relationship to the Company:head office. Cause of occurrence: Location change of the stock affair unit from the 16th day of October, 2023, as detailed below.

Address:10F.,No.380, Sec.6, Nanjing East Rd. Neihu Dist. Taipei City 114030 2.TEL:(02)2718-9898 3.FAX:(02)2718-4668, Counter measures: From the 16th day of October, 2023, please post or refer to the altered address of the Company?s stock affair unit at 10F., No.380, Sec.6, Nanjing East Rd.

Neihu Dist., Taipei City 114030 for the following stock affairs, including stock transfer, dividends or shares allotment, address alternation, stock loss report, pledge creation or removal and the loss report or change of personnel registered seals.