Company: BXSL
Filing Date: 2025-01-21
Form Type: 424B2
Source: 0001193125-25-008530
Chunk: 146

Company: Blackstone Secured Lending Fund
Filing Date: 2025-01-21
Form: 424B2
Chunk 146
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 may file with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, subsequent to the date of this prospectus until all of the securities offered by this prospectus and any accompanying prospectus supplement have been sold or we otherwise terminate the offering of those securities; provided, however, that information “furnished” under Item 2.02 or Item 7.01 of Form 8-K or other information “furnished” to the SEC which is not deemed filed is not incorporated by reference in this prospectus and any accompanying prospectus supplement. Information that we file with the SEC subsequent to the date of this prospectus will automatically update and may supersede information in this prospectus, any accompanying prospectus supplement and other information previously filed with the SEC.

The prospectus incorporates by reference the documents set forth below that have been previously filed with the SEC:

| • |     | the description of our common shares referenced in our Registration Statement on Form 8-A (No. 001-40966), as filed with the SEC on October 26, 2021, including any amendment or report filed for the purpose of updating such description prior to the termination of the offering of the common shares registered hereby. |

See “Available Information” for information on how to obtain a copy of these filings.

<div align='center'>**114

$600,000,000**</div>

### BLACKSTONE SECURED LENDING FUND

#### Common Shares

### PROSPECTUS SUPPLEMENT
| Truist Securities |     | RBC Capital Markets |     | BTIG |     | Compass Point |     | Raymond James |     | Regions        
 Securities LLC |     | Drexel Hamilton |     | SMBC Nikko |

#### January 17, 2025