Form 4 Filing by Blackstone Mortgage Trust, Inc. Officer Marcin Urbaszek

This filing details a Form 4 submission by Marcin Urbaszek, Chief Financial Officer of Blackstone Mortgage Trust, Inc. On June 17, 2026, Mr. Urbaszek disposed of 1,352 shares of Class A Common Stock. This transaction was executed as part of two Rule 10b5-1 trading plans established on March 6, 2025, and February 26, 2026. These plans were implemented to manage tax withholding obligations associated with the vesting of previously awarded restricted stock. Following the transaction, Mr. Urbaszek holds 24,824 shares of Class A Common Stock. The sale price per share was $18.35.