Former Director Denis R. Burger Disposes All Aptose Biosciences Holdings Following Acquisition

This Form 4 filing reports that former director Denis R. Burger disposed of all his holdings in Aptose Biosciences Inc. (APTO) on June 30, 2026, following the company's acquisition by Hammi Pharmaceuticals Co. Ltd. The transaction involved the disposition of 70 common shares at $1.72 per share (converted from C$2.41) and the cancellation of 10 separate stock option grants totaling 519,667 options with exercise prices ranging from $0.66 to $6.91. All transactions were executed pursuant to a board, shareholder, and court-approved business arrangement agreement where Hammi acquired all outstanding shares of Aptose at C$2.41 per share. Following these dispositions, Burger holds zero shares and zero options in the company. The filing notes that option amounts were adjusted for previous reverse stock splits in 2023 and 2025.