Tenaya Therapeutics is trading 15.5% down at $0.42, and no confirmed company-specific catalyst for the October 14 move was identified. - An October 14 Form PRE 14A filing was reported, but available coverage does not establish it as the cause. - The previous session closed at $0.52, down 7.87%, according to the supplied price context. - The cited biotech-sector decline was for October 13; major indices were mixed on October 14, and neither clearly explains the drop.