Astra Agro Lestari is trading at IDR 8,275, 6.09% up from the October 19 close, with the cause of the October 20 rise uncertain. - The available report identifies no catalyst and does not provide actual trading volume. - A planned share buyback of up to Rp400 billion is underway, but no source directly links it to the move; no clear company-specific announcement explaining the increase was found.