SMGB.L is trading at £68.69 (-3.10%) as concerns about tighter AI and data-center rules weighed on U.S. semiconductor shares.

  • On November 4, the Philadelphia Semiconductor Index fell 3.1% in one Reuters report and 3.6% in another.
  • Investors worried Democratic control of Congress could bring tighter rules; doubts about returns on AI spending added pressure.
  • Major U.S. indexes rose while chip stocks weakened, indicating a sector-led decline rather than a broad-market selloff.