enGene Holdings is trading 5.5% lower at $1.62 after hours, with no clear company-specific catalyst identified. - It closed at $1.71 on October 15, then declined 5.53% in after-hours trading. - The company hosted a previously announced KOL webinar that day, but available reporting does not establish it as a catalyst. - Biotech shares rose during regular trading, with XBI up 2.20%; broader markets were mixed, and the decline did not appear to track the sector move.