Company: BXSL
Filing Date: 2025-07-02
Form Type: DEF 14A
Source: 0001193125-25-154956
Chunk: 0

Company: Blackstone Secured Lending Fund
Filing Date: 2025-07-02
Form: DEF 14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule14a-6(e)(2)) |

| ☒ | Definitive Proxy Statement |

| ☐ | Definitive Additional Materials |

| ☐ | Soliciting Material under§240.14a-12 |

Blackstone Secured Lending Fund (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check all boxes that apply):

| ☒ |     | No fee required.                                |
| ☐ |     | Fee paid previously with preliminary materials. |
| ☐ |     | 14a-6(i)(1)                                     
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345 Park Avenue, 31st Floor New York, New York 10154 July 2, 2025 Dear Shareholders: You are cordially invited to attend the 2025 Annual Meeting of Shareholders (the “Meeting”) of Blackstone Secured Lending Fund (the “Company”), a Delaware statutory trust, to be held virtually on September 25, 2025, at 10:00 a.m., Eastern Time at the following website: www.virtualshareholdermeeting.com/BXSL2025. Holders of record of common shares of beneficial interest of the Company, par value $0.001 per share, at the close of business on June 27, 2025 are entitled to notice of, and to vote at, the Meeting or any adjournment or postponement thereof. Details of the business to be conducted at the Meeting are given in the accompanying Notice of Virtual 2025 Annual Meeting of Shareholders and proxy statement. The proxy statement and the Company’s Annual Report on Form 10-Kfor the fiscal year ended December 31, 2024 (the “Annual Report”) are being made available to shareholders on or about July 2, 2025. Your vote is very important to us. The Board of Trustees of the Company (the “Board of Trustees”) unanimously recommends that you