Company: BXSL
Filing Date: 2025-10-06
Form Type: 424B2
Source: 0001213900-25-096307
Chunk: 2

Company: Blackstone Secured Lending Fund
Filing Date: 2025-10-06
Form: 424B2
Chunk 2
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 this prospectus supplement, the accompanying prospectus, and any information incorporated by reference into each, before investing in the Notes and keep them for future reference. We file annual, quarterly and current reports, proxy statements and other information about us with the Securities and Exchange Commission (the “SEC”). You may obtain this information by written or oral request and free of charge by contacting us at 34 5 Pa rk Avenue, 31st Floor, New York, NY 10154, calling us at (212) 503 -2100 or visiting our website at www.bxsl.com . The SEC also maintains a website at http: // www.sec.gov that contains this information. Information on our website and the SEC’s website is not incorporated into or a part of this prospectus supplement or the accompanying prospectus.

|                                    |     |   |     | Per Note |     | Total |
|:-----------------------------------|:----|:--|:----|:---------|:----|:------|
| Public offering price              |     | % |     | $        |     |       |
| Underwriting discount (sales load) |     | % |     | $        |     |       |
| Proceeds to us, before expenses    |     | % |     | $        |     |       |

__________________________________ (1)The public offering price set forth above does not include accrued interest, if any. Interest on the Notes must be paid by the purchaser if the Notes are delivered after October, 2025. (2)Before deducting expenses payable by us related to this offering, estimated at $million. THE NOTES ARE NOT DEPOSITS OR OTHER OBLIGATIONS OF A BANK AND ARE NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY. Neither the SEC, any state securities commission nor any other regulatory body has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense. Delivery of the Notes in book -entry form only through The Depository Trust Company for the accounts of its participants, including Euroclear Bank S.A. / N.V., as operator of the Euroclear System, and Clearstream Banking S.A., will be made on or about October, 2025. __________________________ Joint Book-Running Managers

| Citigroup |     | Deutsche Bank Securities |     | Morgan Stanley |     | SMBC Nikko |     |