UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 7, 2020

Blackstone / GSO Secured Lending Fund

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (212) 503-2100

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act: None

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b–2 of the Securities Exchange Act of 1934.

Emerging growth company  ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

The estimated net asset value (“NAV”) per common share of beneficial interest, par value $0.001 per share (“Share”), of Blackstone / GSO Secured Lending Fund (the “Fund”) as of September 30, 2020 is $24.91. This estimate is subject to the completion of financial closing procedures, and is not a comprehensive statement of the Fund’s financial position at September 30, 2020. Actual results may differ materially from this estimate. Final NAV per Share as of September 30, 2020 will be determined by the Fund’s Board of Trustees.

As of September 30, 2020, the Fund had approximately $3.5 billion of total committed debt capital, of which approximately $2.3 billion of principal debt was outstanding. As of this same date, the Fund had available liquidity of approximately $2.5 billion, including approximately $0.1 billion in cash and cash equivalents, approximately $1.2 billion of uncalled capital commitments, and approximately $1.1 billion available for additional borrowings under its credit facilities, subject to borrowing base and other restrictions.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.