SiTime is trading 5.37% lower at $373.14 on November 5, mainly amid semiconductor-sector pressure over concerns tighter data-center rules could slow AI infrastructure construction. - Reuters reported chip and data-center-related stocks remained under pressure after the midterm results; SOXX was down 3.35%. - SiTime reported strong quarterly results and higher fourth-quarter revenue guidance on November 4; those results do not explain the decline. - No company-specific negative catalyst was identified; available evidence points mainly to sector pressure.