BXMT · Blackstone Mortgage Trust, Inc.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $14.325 to $14.34, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares purchased at each separate price for all transactions reported on this Form 4.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2026 by (2) the closing price of the Company's Class A Common Stock on July 15, 2026.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2026 by (2) the closing price of the Company's Class A Common Stock on July 15, 2026.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2026 by (2) the closing price of the Company's Class A Common Stock on July 15, 2026.

Includes 106 shares acquired since the reporting person's last filing as a result of participation in a dividend reinvestment plan.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2026 by (2) the closing price of the Company's Class A Common Stock on July 15, 2026.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2026 by (2) the closing price of the Company's Class A Common Stock on July 15, 2026.

The sales reported in this Form 4 were effected pursuant to two Rule 10b5-1 trading plans adopted on March 5, 2024 and February 28, 2025 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.0604 to $17.08, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price for all transactions reported on this Form 4.

Represents an award of Class A Common Stock Units in lieu of retainer and meeting fees that convert to shares of Class A Common Stock on a one-for-one basis as determined at the time of the grant. The number of shares of Class A Common Stock subject to the award was calculated by dividing $115,000 in retainer and meeting fees by the closing price for June 26, 2026. The award vests in full on the date of the Company's 2027 annual meeting, subject to the director's continued services as of the date of the 2027 annual meeting.

Represents an award of Restricted Class A Common Stock in lieu of retainer and meeting fees. The number of shares of Restricted Class A Common Stock subject to the award was calculated by dividing $115,000 in retainer and meeting fees by the closing price for June 26, 2026. The award vests in full on the date of the Company's 2027 annual meeting, subject to the director's continued services as of the date of the 2027 annual meeting.

Represents an award of Restricted Class A Common Stock in lieu of retainer and meeting fees. The number of shares of Restricted Class A Common Stock subject to the award was calculated by dividing $115,000 in retainer and meeting fees by the closing price for June 26, 2026. The award vests in full on the date of the Company's 2027 annual meeting, subject to the director's continued services as of the date of the 2027 annual meeting.

Represents an award of Restricted Class A Common Stock in lieu of retainer and meeting fees. The number of shares of Restricted Class A Common Stock subject to the award was calculated by dividing $115,000 in retainer and meeting fees by the closing price for June 26, 2026. The award vests in full on the date of the Company's 2027 annual meeting, subject to the director's continued services as of the date of the 2027 annual meeting.

Represents an award of Restricted Class A Common Stock in lieu of retainer and meeting fees. The number of shares of Restricted Class A Common Stock subject to the award was calculated by dividing $115,000 in retainer and meeting fees by the closing price for June 26, 2026. The award vests in full on the date of the Company's 2027 annual meeting, subject to the director's continued services as of the date of the 2027 annual meeting.

Represents an award of Class A Common Stock Units in lieu of retainer and meeting fees that convert to shares of Class A Common Stock on a one-for-one basis as determined at the time of the grant. The number of shares of Class A Common Stock subject to the award was calculated by dividing $115,000 in retainer and meeting fees by the closing price for June 26, 2026. The award vests in full on the date of the Company's 2027 annual meeting, subject to the director's continued services as of the date of the 2027 annual meeting.

Represents an award of Restricted Class A Common Stock in lieu of retainer and meeting fees. The number of shares of Restricted Class A Common Stock subject to the award was calculated by dividing $115,000 in retainer and meeting fees by the closing price for June 26, 2026. The award vests in full on the date of the Company's 2027 annual meeting, subject to the director's continued services as of the date of the 2027 annual meeting.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on March 26, 2026 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

The sales reported in this Form 4 were effected pursuant to two Rule 10b5-1 trading plans adopted on March 6, 2025 and February 26, 2026 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on April 15, 2026 by (2) the closing price of the Company's Class A Common Stock on April 15, 2026.

Includes 89 shares acquired since the reporting person's last filing as a result of participation in a dividend reinvestment plan.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on April 15, 2026 by (2) the closing price of the Company's Class A Common Stock on April 15, 2026.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on April 15, 2026 by (2) the closing price of the Company's Class A Common Stock on April 15, 2026.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on April 15, 2026 by (2) the closing price of the Company's Class A Common Stock on April 15, 2026.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on March 5, 2024 and February 28, 2025 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.88 to $18.885, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price for all transactions reported on this Form 4.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on March 6, 2025 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on January 15, 2026 by (2) the closing price of the Company's Class A Common Stock on January 15, 2026.

Includes 91 shares acquired since the reporting person's last filing as a result of participation in a dividend reinvestment plan.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on January 15, 2026 by (2) the closing price of the Company's Class A Common Stock on January 15, 2026.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on January 15, 2026 by (2) the closing price of the Company's Class A Common Stock on January 15, 2026.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on January 15, 2026 by (2) the closing price of the Company's Class A Common Stock on January 15, 2026.

The sales reported in this Form 4 were effected pursuant to Rule 10b5-1 trading plans adopted on March 3, 2023, March 5, 2024, and February 28, 2025 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.235 to $19.245, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price for all transactions reported on this Form 4.

For estate planning purposes, the Reporting Person gifted these shares of class A common stock of the Issuer to a trust for the benefit of members of the Reporting Person's family. The Reporting Person is not the trustee of the trust.

The sales reported in this Form 4 were effected pursuant to Rule 10b5-1 trading plans adopted on March 12, 2024 and March 6, 2025 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $20.310 to $20.315, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares purchased at each separate price for all transactions reported on this Form 4.

The sales reported in this Form 4 were effected pursuant to Rule 10b5-1 trading plans adopted on March 6, 2025 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

Represents shares of restricted class A common stock of the Issuer granted pursuant to the Issuer's Stock Incentive Plan.

Represents shares of restricted class A common stock of the Issuer granted pursuant to the Issuer's Stock Incentive Plan.

Represents shares of restricted class A common stock of the Issuer granted pursuant to the Issuer's Stock Incentive Plan.

Represents shares of restricted class A common stock of the Issuer granted pursuant to the Issuer's Stock Incentive Plan.

The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person prior to February 27, 2023 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

Represents an award of Restricted Class A Common Stock in lieu of retainer and meeting fees. The number of shares of Restricted Class A Common Stock subject to the award was calculated by dividing $78,137 in prorated retainer and meeting fees for the director's service for the period from October 22, 2025 through the date of the Company's 2026 annual meeting, by the closing price for October 22, 2025. The award vests in full on the date of the Company's 2026 annual meeting, subject to the director's continued services as of the date of the 2026 annual meeting.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on October 15, 2025 by (2) the closing price of the Company's Class A Common Stock on October 15, 2025.

Includes 92 shares acquired since the reporting person's last filing as a result of participation in a dividend reinvestment plan.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on October 15, 2025 by (2) the closing price of the Company's Class A Common Stock on October 15, 2025.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on October 15, 2025 by (2) the closing price of the Company's Class A Common Stock on October 15, 2025.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on October 15, 2025 by (2) the closing price of the Company's Class A Common Stock on October 15, 2025.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on March 6, 2025 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

The sales reported in this Form 4 were effected pursuant to Rule 10b5-1 trading plans adopted on August 8, 2024 and March 18, 2025 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.4851 to $19.50, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price for all transactions reported on this Form 4.

The sales reported in this Form 4 were effected pursuant to Rule 10b5-1 trading plans adopted on March 12, 2024 and March 6, 2025 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.4810 to $19.4850, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price for all transactions reported on this Form 4

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on August 8, 2024 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.25 to $19.26, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price for all transactions reported on this Form 4.

The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person prior to February 27, 2023 to satisfy certain tax withholding related obligations in connection with the vesting of previously granted restricted stock awards.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2025 by (2) the closing price of the Company's Class A Common Stock on July 15, 2025.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2025 by (2) the closing price of the Company's Class A Common Stock on July 15, 2025.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2025 by (2) the closing price of the Company's Class A Common Stock on July 15, 2025.

Includes 82 shares acquired since the reporting person's last filing as a result of participation in a dividend reinvestment plan.

Represents Class A Common Stock Units in lieu of dividends payable on Class A Common Stock Units owned by the Reporting Person, which convert to shares of Class A Common Stock on a one-for-one basis. The number of Class A Common Stock Units was calculated by dividing (1) the product of the number of Class A Common Stock Units owned by the Reporting Person and the $0.47 per share dollar amount of the Class A Common Stock dividend paid by the Company on July 15, 2025 by (2) the closing price of the Company's Class A Common Stock on July 15, 2025.

Represents an award of Class A Common Stock Units in lieu of retainer and meeting fees that convert to shares of Class A Common Stock on a one-for-one basis as determined at the time of the grant. The number of shares of Class A Common Stock subject to the award was calculated by dividing $115,000 in retainer and meeting fees by the closing price for June 27, 2025. The award vests in full on the date of the Company's 2026 annual meeting, subject to the director's continued services as of the date of the 2026 annual meeting.