SES AI Corp (SES) experienced a significant after-hours plunge of 5.10% on Friday, following an announcement that board member Dr. Jang Wook Choi will be resigning from the company's Board of Directors. The resignation, effective November 10, 2025, was cited as being due to personal reasons.

The company stated that Dr. Choi's departure is not related to any disagreement regarding SES AI's operations or practices. However, the sudden nature of the announcement appears to have unsettled investors, leading to the sharp decline in share price during after-hours trading.

Earlier in the day, Deutsche Bank adjusted its price target for SES AI from $1 to $2 while maintaining a Hold rating on the stock. This adjustment, made before the resignation announcement, didn't seem to significantly impact the stock's performance during regular trading hours. The contrast between the positive price target adjustment and the negative after-hours reaction highlights the market's sensitivity to unexpected changes in company leadership.