Sono Group is trading 5.42% up at $2.33 after Alpine Fox disclosed a 21.5% stake. - The October 1 Schedule 13D said the shares were acquired through open-market purchases for investment, with no current plan to change or influence control. - Sono Group had already gained 97.32% at the October 1 close. The SEC confirms the filing, but it does not establish that the disclosure caused the move; the broader market is also higher.