BXSL Blackstone Secured Lending Fund

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

(Rule 13d-102)

Information to be Included in Statements Filed Pursuant to § 240.13d-1(b), (c) and (d) and

Amendments Thereto Filed Pursuant to § 240.13d-2

Under the Securities Exchange Act of 1934

(Amendment No.    )*

Blackstone Secured Lending Fund

(Name of Issuer)

Common Shares of Beneficial Interest, $0.001 par value per share

(Title of Class of Securities)

09261X102

(CUSIP Number)

June 22, 2023

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this schedule is filed:

☐ Rule 13d-1(b)

☒ Rule 13d-1(c)

☐ Rule 13d-1(d)

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

¹    Based on a total of 160,784,501 Common Shares outstanding as of May 8, 2023, as reported in the Form 10-Q.

(a) Name of Issuer:

Blackstone Secured Lending Fund (the “Issuer”)

(b) Address of Issuer’s Principal Executive Offices:

345 Park Avenue

31^st Floor

New York, New York 10154

(a) Name of Persons Filing:

This Schedule 13G is being filed jointly by Greenwich Venture Capital LLC (“Greenwich Venture”), Locust Street Associates GP, LLC (“Locust Street”) and Michael Karp (collectively with Locust Street and Greenwich Venture, the “Reporting Persons”), pursuant to a Joint Filing Agreement attached hereto as Exhibit 1 in accordance with Rule 13d-1(k)(1) under the Act.

The Common Shares (as defined below) reported herein are held directly by Greenwich Venture. Locust Street is the sole member of Greenwich Venture. Mr. Karp is the sole member of Locust Street. Locust Street and Mr. Karp may be deemed to beneficially own the Common Shares held directly by Greenwich Venture.

(b) Address of Principal Business Office or, if none, Residence:

The business address of each of the Reporting Persons is: 1062 Lancaster Avenue, Suite 30B, Bryn Mawr, PA 19010

(c) Citizenship:

Greenwich Venture is organized in Delaware

Locust Street is organized in Pennsylvania

Mr. Karp is a citizen of the United States

(d) Title of Class of Securities:

Common Shares of Beneficial Interest, $0.001 par value per share (the “Common Shares”)

(e) CUSIP Number:

09261X102

If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

NOT APPLICABLE

(a) AMOUNT BENEFICIALLY OWNED:

See responses to Item 9 on each cover page.

(b) PERCENT OF CLASS:

See responses to Item 11 on each cover page.

(c) NUMBER OF SHARES AS TO WHICH SUCH PERSON HAS:

(i) SOLE POWER TO VOTE OR TO DIRECT THE VOTE

See responses to Item 5 on each cover page.

(ii) SHARED POWER TO VOTE OR TO DIRECT THE VOTE

See responses to Item 6 on each cover page.

(iii) SOLE POWER TO DISPOSE OR TO DIRECT THE DISPOSITION OF

See responses to Item 7 on each cover page.

(iv) SHARED POWER TO DISPOSE OR TO DIRECT THE DISPOSITION OF

See responses to Item 8 on each cover page.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following  ☐.

NOT APPLICABLE

NOT APPLICABLE

NOT APPLICABLE

NOT APPLICABLE

By signing below each of the undersigned certifies that, to the best of its or his knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the Issuer and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: July 3, 2023

EXHIBIT 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned hereby confirm the agreement by and among them to the joint filing on behalf of them of the Statement on Schedule 13G and any and all further amendments thereto, with respect to the securities of Blackstone Secured Lending Fund, and that this Agreement be included as an Exhibit to such filing. This Agreement may be executed in any number of counterparts each of which shall be deemed to be an original and all of which together shall be deemed to constitute one and the same Agreement.

IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of July 3, 2023.