BLACKSTONE MORTGAGE TRUST INC

Section 13(r) Disclosure

Pursuant to Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012, which added Section 13(r) of the Exchange Act, we hereby incorporate by reference herein Exhibit 99.1 of this report, which includes disclosures regarding activities at Mundys S.p.A. (formerly, Atlantia S.p.A.), which may be, or may have been at the time considered to be, an affiliate of Blackstone and, therefore, our affiliate.

Rule 10b5-1 Trading Arrangements

During the three months ended March 31, 2024, two of our officers adopted a “Rule 10b5-1 trading arrangement,” as defined in Item 408(c) of Regulation S-K, each of which is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act. Katharine A. Keenan, our Chief Executive Officer, adopted a Rule 10b5-1 sales plan on March 15, 2024 that provides for the automatic sale of shares of class A common stock in order to satisfy tax withholding obligations arising from vesting of an aggregate of 52,000 shares of restricted stock granted on December 15, 2024, held by Ms. Keenan. The number of shares to be sold under the plan is unknown, as the number of shares will vary based on the extent to which vesting conditions are satisfied and the market price of our class A common stock at the time of vesting. Ms. Keenan’s Rule 10b5-1 sales plan will expire on December 31, 2026, subject to the plan’s earlier expiration or completion in accordance with its terms. Anthony F. Marone, Jr., our Chief Financial Officer, adopted a Rule 10b5-1 sales plan on March 12, 2024 that provides for the automatic sale of shares of class A common stock in order to satisfy tax withholding obligations arising from vesting of an aggregate of 12,000 shares of restricted stock granted on December 15, 2024, held by Mr. Marone. The number of shares to be sold under the plan is unknown, as the number of shares will vary based on the extent to which vesting conditions are satisfied and the market price of our class A common stock at the time of vesting. Mr. Marone’s Rule 10b5-1 sales plan will expire on December 31, 2026, subject to the plan’s earlier expiration or completion in accordance with its terms.