Aehr Test Systems is trading 5.8% higher at $65.58 on October 21, amid an after-hours semiconductor rebound. - Shares closed down 2.12% at $61.99 on October 20. - Super Micro’s preliminary revenue news lifted chip-sector sentiment, while SOXX was indicated 2.52% higher after hours. - No new company-specific announcement was identified for October 21; the latest catalyst is an approximately $6 million AI processor test-system follow-on order announced October 7. First-quarter fiscal 2027 results are scheduled for November 2.