Fletcher Payne Form 4 Filing

This filing details transactions made by Fletcher Payne, former SVP and CFO of Aptose Biosciences Inc. On June 30, 2026, Payne disposed of 222 non-derivative shares of Common Stock and 22 non-derivative shares held by the Fletcher Payne 2019 Trust. Additionally, Payne disposed of various derivative securities, including employee stock options and common stock options. Specifically, 55,000 employee stock options with an exercise price of $2.00, 200,000 employee stock options with an exercise price of $0.66, and 1,000,000 common stock options with an exercise price of $0.8479 were disposed of. These transactions were made pursuant to a business arrangement agreement, as noted by footnote F1. The disposed shares had a transaction price of $1.72 per share, converted from C$2.41.