Sono Group is trading 10.95% higher at $2.45 after closing at $2.21 on October 1 and a sharp 97.32% regular-session gain; no clear after-hours catalyst was identified. - A post-close report said Alpine Fox disclosed a 21.5% stake, but the available SEC filing does not confirm the October 1 disclosure or establish it as the cause of the move. - The earlier proposed Sports One combination is non-binding and was announced August 31, so it is not a confirmed new event explaining the after-hours rise.