ASE Industrial Holding is trading at $35.18, down 6.21%, before the November 5, 2026 session amid weakness in U.S. semiconductor shares. - Overnight concerns that tighter data-center rules could slow AI infrastructure construction and chip demand weighed on the sector; the Philadelphia Semiconductor Index fell 3.13%. - No fresh company-specific catalyst was identified. ASE’s latest reported Q3 results beat estimates and were released October 29. - Premarket volume and activity data were unavailable in the reviewed sources.