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These shares were sold in multiple transactions at prices ranging from $11.6451 to $11.65, inclusive. The Reporting Person undertakes to\nprovide, 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\ntransactions reported on this Form 4."}],"balance_after":70047,"source":{"system":"sec-edgar","filing":"0001061630-26-000079","document":"wk-form4_1790898567.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163026000079/wk-form4_1790898567.xml","form_type":"4"}},{"id":4623987,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":36936,"kind":"person","name":"URBASZEK MARCIN","position":1,"cik":"0001707300","reported_name":"URBASZEK MARCIN","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2026-09-18T21:31:36.000Z","date":"2026-09-17","kind":"sale","planned":true,"acquired":false,"shares":864,"price":13.4227,"value":11597.2128,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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\nconnection with the vesting of previously granted restricted stock awards."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.4207 to $13.425, inclusive. The Reporting Person undertakes to\nprovide, 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\ntransactions reported on this Form 4."}],"balance_after":23960,"source":{"system":"sec-edgar","filing":"0001061630-26-000077","document":"wk-form4_1789767093.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163026000077/wk-form4_1789767093.xml","form_type":"4"}},{"id":4624010,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":34188,"kind":"person","name":"Pena Fernando Austin","position":1,"cik":"0002089544","reported_name":"Pena Fernando Austin","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Class A Common Stock","published_at":"2026-09-18T21:31:30.000Z","date":"2026-09-17","kind":"sale","planned":true,"acquired":false,"shares":1127,"price":13.4241,"value":15128.9607,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":71772,"source":{"system":"sec-edgar","filing":"0001061630-26-000076","document":"wk-form4_1789767088.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163026000076/wk-form4_1789767088.xml","form_type":"4"}},{"id":694535,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":25959,"kind":"person","name":"NASSAU HENRY N","position":1,"cik":"0001177127","reported_name":"NASSAU HENRY N","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-08-06T20:43:10.000Z","date":"2026-08-04","kind":"purchase","planned":false,"acquired":true,"shares":10000,"price":14.3357,"value":143357.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. 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The Reporting Person undertakes to\nprovide, 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\ntransactions reported on this Form 4."}],"balance_after":72899,"source":{"system":"sec-edgar","filing":"0001061630-26-000051","document":"wk-form4_1782944055.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163026000051/wk-form4_1782944055.xml","form_type":"4"}},{"id":724658,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":25959,"kind":"person","name":"NASSAU HENRY N","position":1,"cik":"0001177127","reported_name":"NASSAU HENRY N","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-06-29T21:49:11.000Z","date":"2026-06-26","kind":"grant","planned":false,"acquired":true,"shares":6597,"price":17.43,"value":114985.71,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents an award of Restricted Class A Common Stock in lieu of retainer and meeting fees. 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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."}],"balance_after":76967,"source":{"system":"sec-edgar","filing":"0002089544-26-000004","document":"wk-form4_1775081445.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000208954426000004/wk-form4_1775081445.xml","form_type":"4"}},{"id":835716,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":36936,"kind":"person","name":"URBASZEK MARCIN","position":1,"cik":"0001707300","reported_name":"URBASZEK MARCIN","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2026-03-18T22:31:34.000Z","date":"2026-03-17","kind":"sale","planned":true,"acquired":false,"shares":452,"price":19.13,"value":8646.76,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":26176,"source":{"system":"sec-edgar","filing":"0001061630-26-000013","document":"wk-form4_1773873092.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163026000013/wk-form4_1773873092.xml","form_type":"4"}},{"id":935899,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30153,"kind":"person","name":"SAGALYN LYNNE B","position":1,"cik":"0001195695","reported_name":"SAGALYN LYNNE B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-01-21T00:03:33.000Z","date":"2026-01-15","kind":"grant","planned":false,"acquired":true,"shares":3300,"price":19.5,"value":64350.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":152828,"source":{"system":"sec-edgar","filing":"0001195695-26-000002","document":"wk-form4_1768953811.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000119569526000002/wk-form4_1768953811.xml","form_type":"4"}},{"id":935902,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30151,"kind":"person","name":"Cotton Leonard W","position":1,"cik":"0001373685","reported_name":"Cotton Leonard W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-01-21T00:03:28.000Z","date":"2026-01-15","kind":"grant","planned":false,"acquired":true,"shares":1534,"price":19.5,"value":29913.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 91 shares acquired since the reporting person's last filing as a result of participation in a dividend reinvestment plan."}],"balance_after":88681,"source":{"system":"sec-edgar","filing":"0001373685-26-000002","document":"wk-form4_1768953806.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000137368526000002/wk-form4_1768953806.xml","form_type":"4"}},{"id":935898,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":25959,"kind":"person","name":"NASSAU HENRY N","position":1,"cik":"0001177127","reported_name":"NASSAU HENRY N","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-01-21T00:03:24.000Z","date":"2026-01-15","kind":"grant","planned":false,"acquired":true,"shares":2550,"price":19.5,"value":49725.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":196351,"source":{"system":"sec-edgar","filing":"0001177127-26-000002","document":"wk-form4_1768953801.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000117712726000002/wk-form4_1768953801.xml","form_type":"4"}},{"id":935897,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":23070,"kind":"person","name":"Lynch Nnenna","position":1,"cik":"0001862674","reported_name":"Lynch Nnenna","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-01-21T00:03:18.000Z","date":"2026-01-15","kind":"grant","planned":false,"acquired":true,"shares":809,"price":19.5,"value":15775.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":34405,"source":{"system":"sec-edgar","filing":"0001862674-26-000002","document":"wk-form4_1768953795.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000186267426000002/wk-form4_1768953795.xml","form_type":"4"}},{"id":955596,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":34188,"kind":"person","name":"Pena Fernando Austin","position":1,"cik":"0002089544","reported_name":"Pena Fernando Austin","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Class A Common Stock","published_at":"2026-01-02T22:21:56.000Z","date":"2025-12-31","kind":"sale","planned":true,"acquired":false,"shares":3131,"price":19.2379,"value":60233.8649,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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\nconnection with the vesting of previously granted restricted stock awards."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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\nto 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\ntransactions reported on this Form 4."}],"balance_after":78633,"source":{"system":"sec-edgar","filing":"0002089544-26-000002","document":"wk-form4_1767392513.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000208954426000002/wk-form4_1767392513.xml","form_type":"4"}},{"id":958753,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":30153,"kind":"person","name":"SAGALYN LYNNE B","position":1,"cik":"0001195695","reported_name":"SAGALYN LYNNE B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2025-12-29T23:19:04.000Z","date":"2025-12-25","kind":"gift","planned":false,"acquired":false,"shares":10777,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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. 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These shares were sold in multiple transactions at prices ranging from $19.0500 to $19.2150, 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."}],"balance_after":236914,"source":{"system":"sec-edgar","filing":"0001061630-25-000071","document":"wk-form4_1750292327.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163025000071/wk-form4_1750292327.xml","form_type":"4"}},{"id":1106782,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":36936,"kind":"person","name":"URBASZEK MARCIN","position":1,"cik":"0001707300","reported_name":"URBASZEK MARCIN","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Deputy Chief Financial Officer"}}],"security":"Class A Common Stock","published_at":"2025-06-19T00:18:43.000Z","date":"2025-06-17","kind":"sale","planned":true,"acquired":false,"shares":800,"price":19.145,"value":15316.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":12089,"source":{"system":"sec-edgar","filing":"0001061630-25-000070","document":"wk-form4_1750292317.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163025000070/wk-form4_1750292317.xml","form_type":"4"}},{"id":1106781,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":45905,"kind":"person","name":"Marone Anthony F. 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These shares were sold in multiple transactions at prices ranging from $19.2034 to $19.2051, 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."}],"balance_after":64082,"source":{"system":"sec-edgar","filing":"0001061630-25-000069","document":"wk-form4_1750292308.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163025000069/wk-form4_1750292308.xml","form_type":"4"}},{"id":1128165,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":45885,"kind":"person","name":"Keenan Katharine A","position":1,"cik":"0001802461","reported_name":"Keenan Katharine A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO & President"}}],"security":"Class A Common Stock","published_at":"2025-06-02T20:10:03.000Z","date":"2025-05-30","kind":"sale","planned":true,"acquired":false,"shares":2327,"price":18.915,"value":44015.205,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":243845,"source":{"system":"sec-edgar","filing":"0001061630-25-000063","document":"wk-form4_1748894997.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1061630/000106163025000063/wk-form4_1748894997.xml","form_type":"4"}},{"id":1128163,"issuer":{"id":4404,"kind":"organization","name":"BLACKSTONE MORTGAGE TRUST, INC."},"owners":[{"id":45905,"kind":"person","name":"Marone Anthony F. 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