Form 4 Filing for Aptose Biosciences Inc.

This filing details transactions by Bernd R. Seizinger, a former director of Aptose Biosciences Inc. On June 30, 2026, Seizinger disposed of 17,000 common shares with a transaction price of $1.72 per share, as noted by footnote F2 which references a conversion from Canadian dollars. Additionally, Seizinger disposed of several stock options: 3,333 Director Stock Options with an exercise price of $2.00, 100,000 Stock Options with an exercise price of $0.66, and 50,000 Stock Options with an exercise price of $0.74. All these option disposals are marked with footnote F1, indicating they were part of a business arrangement agreement leading to the acquisition of the issuer by Hammi Pharmaceuticals Co. Ltd. Following these transactions, Seizinger holds 0 shares and 0 options. The footnote F3 provides details on the vesting schedule for the options.