SCHEDULE 13G/A 0002114106-26-000001 0002114106 XXXXXXXX LIVE 1 Class A Common Shares 10/16/2025 0002025416 OBOOK HOLDINGS INC. G67187107 9F., NO. 28, WENCHENG RD., BEITOU DIST. TAIPEI CITY F5 112 Rule 13d-1(d) HSIEH CHUNG HAN F5 10200000.00 0.00 10200000.00 0.00 10200000.00 21.3 IN (1) Consists of 200,000 Class A Common Shares and 10,000,000 Class B Common Shares beneficially owned by the Reporting Person. (2) Each Class B Common Share is convertible at any time into one Class A Common Share. (3) The percent of class reported herein is based on the quotient obtained by dividing (a) the aggregate number of Class A Common Shares and Class B Common Shares beneficially owned by the Reporting Person by (b) the sum of (i) 37,899,671 Class A Common Shares outstanding and (ii) 10,000,000 Class B Common Shares beneficially owned by the Reporting Person. The Class B Common Shares are treated as converted into Class A Common Shares solely for the purpose of computing the percentage ownership reported herein. (4) Each Class A Common Share is entitled to one vote and each Class B Common Share is entitled to ten votes. The percentage ownership reported herein does not reflect the ten-for-one voting power of the Class B Common Shares. Accordingly, the Reporting Person may have greater voting power than the percentage ownership reported herein. (5) The information reported herein is based on the Issuer's share capital as of December 31, 2025. OBOOK HOLDINGS INC. 9F., NO. 28, WENCHENG RD., BEITOU DIST., TAIPEI CITY, TAIWAN, 112. HSIEH CHUNG HAN 9F., NO. 28, WENCHENG RD., BEITOU DIST., TAIPEI CITY 112, TAIWAN TAIWAN Y 10,200,000 (1)(2)(5) 21.3% (2)(3)(4)(5) 10,200,000 (1)(2)(5) 0 10,200,000 (1)(2)(5) 0 Y Y Y Y Y Y HSIEH CHUNG HAN /s/ HSIEH CHUNG HAN 03/11/2026 (1) Consists of 200,000 Class A Common Shares and 10,000,000 Class B Common Shares beneficially owned by the Reporting Person. (2) Each Class B Common Share is convertible at any time into one Class A Common Share. (3) The percent of class reported herein is based on the quotient obtained by dividing (a) the aggregate number of Class A Common Shares and Class B Common Shares beneficially owned by the Reporting Person by (b) the sum of (i) 37,899,671 Class A Common Shares outstanding and (ii) 10,000,000 Class B Common Shares beneficially owned by the Reporting Person. The Class B Common Shares are treated as converted into Class A Common Shares solely for the purpose of computing the percentage ownership reported herein. (4) Each Class A Common Share is entitled to one vote and each Class B Common Share is entitled to ten votes. The percentage ownership reported herein does not reflect the ten-for-one voting power of the Class B Common Shares. Accordingly, the Reporting Person may have greater voting power than the percentage ownership reported herein. (5) The information reported herein is based on the Issuer's share capital as of December 31, 2025.