Director Lynne B. Sagalyn Acquires 3,939 BXMT Shares Through Dividend Reinvestment

Blackstone Mortgage Trust, Inc. director Lynne B. Sagalyn acquired 3,939 shares of Class A Common Stock on July 15, 2026, through a dividend reinvestment plan. The shares were acquired at $17.12 per share, representing Class A Common Stock Units in lieu of dividends that convert to shares on a one-for-one basis. The transaction was calculated based on the $0.47 per share dividend paid on July 15, 2026, divided by the closing stock price of $17.12 on that date. Following this acquisition, Sagalyn's total holdings increased to 166,639 shares. The filing represents a routine Form 4 disclosure of director stock acquisitions through dividend reinvestment rather than open market purchases.