Marketech International Corp.: Company announcement in accordance with Article 25, Paragraph 1, Subparagraph 4 of the "Regulations Governing Loaning of Funds and Endorsements/Guarantees by Public Companies"

1. Date of occurrence of the event: 2026/05/05 2. Companies for which endorsements/guarantees are provided: (1) Company name: Shanghai Jiwei Electronic System Engineering Co., Ltd. (2) Relationship with the company providing endorsements/guarantees: 100% indirectly invested subsidiary of the company (3) Endorsement/guarantee limit (in thousands of NTD): 8,734,718 (4) Original endorsement/guarantee balance (in thousands of NTD): 96,343 (5) New endorsement/guarantee amount (in thousands of NTD): 835,943 (6) Endorsement/guarantee balance as of the date of occurrence (in thousands of NTD): 932,286 (7) Actual amount utilized by the endorsed/guaranteed company (in thousands of NTD): 239,349 (8) Reason for the new endorsement/guarantee: Bank financing needs (1) Company name: Huayou Chemical International Trade (Shanghai) Co., Ltd. (2) Relationship with the company providing endorsements/guarantees: 100% indirectly invested subsidiary of the company (3) Endorsement/guarantee limit (in thousands of NTD): 8,734,718 (4) Original endorsement/guarantee balance (in thousands of NTD): 175,973 (5) New endorsement/guarantee amount (in thousands of NTD): 222,262 (6) Endorsement/guarantee balance as of the date of occurrence (in thousands of NTD): 398,235 (7) Actual amount utilized by the endorsed/guaranteed company (in thousands of NTD): 0 (8) Reason for the new endorsement/guarantee: Bank financing needs (1) Company name: Wuxi Qihua Electronic Technology Co., Ltd. (2) Relationship with the company providing endorsements/guarantees: 100% indirectly held subsidiary of the company (3) Endorsement/guarantee limit (in thousands of NTD): 8,734,718 (4) Original endorsement/guarantee balance (in thousands of NTD): 366,572 (5) New endorsement/guarantee amount (in thousands of NTD): 227,706 (6) Endorsement/guarantee balance as of the date of occurrence (in thousands of NTD): 594,278 (7) Actual amount utilized by the endorsed/guaranteed company (in thousands of NTD): 58,252 (8) Reason for the new endorsement/guarantee: Bank financing needs (1) Company name: Marketech International Corporation USA (2) Relationship with the company providing endorsements/guarantees: 100% directly invested subsidiary of the company (3) Endorsement/guarantee limit (in thousands of NTD): 8,734,718 (4) Original endorsement/guarantee balance (in thousands of NTD): 863,865 (5) New endorsement/guarantee amount (in thousands of NTD): 255,960 (6) Endorsement/guarantee balance as of the date of occurrence (in thousands of NTD): 1,119,825 (7) Actual amount utilized by the endorsed/guaranteed company (in thousands of NTD): 991,845 (8) Reason for the new endorsement/guarantee: Bank financing needs 3. Collateral provided by the endorsed/guaranteed company: (1) Content: None (2) Value (in thousands of NTD): 0 4. Latest financial statements of the endorsed/guaranteed company: (1) Capital (in thousands of NTD): 2,713,497 (2) Accumulated profit/loss (in thousands of NTD): -1,372,820 5. Conditions for lifting endorsement/guarantee liability: (1) Conditions: As per contract (2) Date: As per contract 6. Total endorsement/guarantee limit (in thousands of NTD): 87,347,175 7. Endorsement/guarantee balance as of the date of occurrence (in thousands of NTD): 3,932,143 8. Ratio of endorsement/guarantee balance to the net worth of the public company's latest financial statements as of the date of occurrence: 22.51 9. Total sum of endorsement/guarantee, long-term investments, and loans to others as a ratio of the public company's latest financial statements' net worth as of the date of occurrence: 30.19 10. Other matters that need to be specified: Shanghai Jiwei Electronic System Engineering Co., Ltd. total capital (in thousands of NTD): 563,720 Huayou Chemical International Trade (Shanghai) Co., Ltd. total capital (in thousands of NTD): 263,671 Wuxi Qihua Electronic Technology Co., Ltd. total capital (in thousands of NTD): 815,873 Marketech International Corporation USA total capital (in thousands of NTD): 1,070,233

Shanghai Jiwei Electronic System Engineering Co., Ltd. accumulated profit/loss (in thousands of NTD): -213,015 Huayou Chemical International Trade (Shanghai) Co., Ltd. accumulated profit/loss (in thousands of NTD): 281,816 Wuxi Qihua Electronic Technology Co., Ltd. accumulated profit/loss (in thousands of NTD): -877,150 Marketech International Corporation USA accumulated profit/loss (in thousands of NTD): -564,471 Keywords: Material Information