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): September 18, 2018 (September 17, 2018)

Goldman Sachs Middle Market Lending Corp.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (212) 902-0300

Not Applicable

(Former name or 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:

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.  ☒

Item 1.01 – Entry into a Material Definitive Agreement.

On September 17, 2018, Goldman Sachs Middle Market Lending Corp. (the “Company”) entered into the first amendment (the “Amendment”) to the senior secured revolving credit agreement among the Company, as borrower, the lenders party thereto, and SunTrust Bank, as administrative agent (as amended and supplemented, the “Revolving Credit Facility”) to, among other things, provide for up to $300 million of additional capacity under the accordion feature of the Revolving Credit Facility.

On September 17, 2018, immediately after the effectiveness of the Amendment, the Company entered into (i) an agreement with Barclays Bank PLC (the “Barclays Joinder Agreement”), pursuant to which Barclays Bank PLC agreed to provide a $50 million commitment through the accordion feature in the Revolving Credit Facility and (ii) an agreement with CIBC Bank USA (the “CIBC Joinder Agreement”), pursuant to which CIBC Bank USA agreed to provide a $50 million commitment through the accordion feature in the Revolving Credit Facility.

The Barclays Joinder Agreement and CIBC Joinder Agreement collectively increased the aggregate commitments under the Revolving Credit Facility from $500 million to $600 million. The accordion feature of the Revolving Credit Facility would allow the Company, under certain circumstances, to increase the total size of the facility to a maximum of $800 million.

The foregoing descriptions are only a summary of the material provisions of the Amendment, the Barclays Joinder Agreement and the CIBC Joinder Agreement and are qualified in their entirety by reference to copies of the Amendment, the Barclays Joinder Agreement and the CIBC Joinder Agreement, which are filed as Exhibits 10.1, 10.2 and 10.3, respectively, to this Current Report on Form 8-K and incorporated by reference herein.

Item 2.03 – Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information set forth under Item 1.01 above is incorporated by reference into this Item 2.03.

Item 9.01 – Financial Statements and Exhibits.

(d) Exhibits:

SIGNATURES

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.