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): January 30, 2020 (January 27, 2020)

Goldman Sachs Private Middle Market Credit II LLC

(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:

Securities registered pursuant to Section 12(b) of the Act:

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 January 27, 2020, Goldman Sachs Private Middle Market Credit II LLC (The “Company”) entered into a third amendment (the “Amendment”) to its senior secured revolving credit agreement, dated as of May 7, 2019, among the Company, as borrowers, the lenders party thereto, and MUFG Union Bank, N.A. as administrative agent (as amended or otherwise modified, the “Revolving Credit Facility”) pursuant to which Societe Generale agreed to become a lender with a $100 million commitment through the accordion feature in the Revolving Credit Facility.

The Amendment increased the aggregate commitments under the Revolving Credit Facility from $400 million to $500 million. The Revolving Credit Facility includes an accordion feature, which allows the Company, subject to the satisfaction of various conditions, to bring total commitments under the Revolving Credit Facility to $500 million. The foregoing descriptions are only a summary of the material provisions of the Amendment and are qualified in their entirety by reference to a copy of the Amendment, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and is 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.