Bleichroeder LP Expands Its Stake in Aptose Biosciences Bleichroeder LP has acquired 3,666,667 shares of Aptose Biosciences Inc. at $3.81 per share, increasing its total holdings to 3,750,000 shares. This move highlights the firm's confidence in Aptose's innovative cancer therapies. However, Aptose faces challenges, including weak financial metrics and a bearish market sentiment.1