[ChipMOS] Announcement of Significant Financial and Business Information Due to Securities Reaching Surveillance Threshold on Exchange

1. Date of Event: 115/09/23 2. Reason for Disclosure: In accordance with instructions from the Taiwan Stock Exchange Corporation 3. Financial and Business Information: Period (Month) (Quarter) (Last Four Quarters Cumulative) ======== ===================== ===================== ==================== Most Recent Month vs. Same Month Last Most Recent Quarter vs. Same Quarter Last 114 Q3 to 115 Q2 Item Aug-115 Year Change % Q2-115 Year Change % (Consolidated Reviewed Figures) (Consolidated Self-Reported Figures) (Consolidated Reviewed Figures) ======== ========== ========== =========== ========= ==================== Revenue 4,810 40.60% 12,496 30.66% 44,769 (NT$ million) Pre-tax Net Profit 1,110 255.77% 1,784 188.21% 4,517 (NT$ million) Net Profit Attributable to Owners of Parent Company (NT$ million) 817 353.89% 1,311 287.87% 2,841 Earnings Per Share (NT$) 1.59 297.50% 2.57 247.30% 5.90 4. Whether there are any material events under Article 4 of the 'Taiwan Stock Exchange Corporation Procedures for Verification and Public Disclosure of Material Information by Listed Companies': No 5. Whether there is a press conference required under Article 11 of the same procedures: No 6. Complete financial information is available on the Public Information Observation Station. Access paths are as follows: (1) Recent operating revenue and income statement: Basic Information > Highlights (2) Historical monthly operating revenue: Operations Overview > Monthly Revenue > Monthly Operating Revenue Information (Post-IFRS Adoption) (3) Historical income (audited/reviewed figures): Financial Statements > Post-IFRS Adoption > Consolidated/Individual Statements > Comprehensive Income Statement (4) Historical income (voluntary self-reported figures): Operations Overview > Self-Reported Earnings Announcement: None 7. Other Matters to be Disclosed: None