X0609 4 2026-04-13 0 0001122411 ASE Technology Holding Co., Ltd. ASX 0002111679 Chen Jeffrey true ROOM 1901, NO. 333 SECTION 1 KEELUNG RD. TAIPEI TAIWAN F5 110 TAIWAN 1 0 0 0 0 Ordinary Shares 2026-04-13 4 S 0 9000 408.33 D 164000 I By Spouse Ordinary Shares 2026-04-14 4 S 0 9000 427 D 155000 I By Spouse Ordinary Shares 2026-04-15 4 S 0 9000 432 D 146000 I By Spouse Ordinary Shares 2383000 D New Taiwan Dollars. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $408 to $408.5 New Taiwan Dollars per share. The holder undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon written request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The Reporting Person disclaims beneficial ownership over the securities reported except to the extent of his pecuniary interest therein, if any. /s/ Georgette Yeh, attorney-in-fact for Jeffrey Chen 2026-04-15