SES AI is trading 5.24% down at $0.60 on October 21, 2026; available evidence does not identify a clear reason for the decline. - The South Korea drone-battery plant expansion announcement was dated October 19 and does not establish a cause for the current move. - The supplied market snapshot showed the Nasdaq up 0.76% and the S&P 500 up 0.22%, while SES AI fell. - No volume comparison was provided.