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): February 22, 2018

MOELIS & COMPANY

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code (212) 883-3800

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 (see General Instruction A.2. below):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  o

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.       o

Item 8.01 Other Events.

On November 24, 2017, Moelis & Company (the “Company”) filed an automatic shelf registration statement on Form S-3 (File No. 333-221743) (the “Registration Statement”) with the Securities and Exchange Commission under the Securities Act of 1933, as amended, covering an unspecified amount of shares of its Class A common stock, par value $0.01 per share (the “Class A common stock”).

On February 22, 2018, Company filed a prospectus supplement (the “Resale Prospectus Supplement”) to the Registration Statement covering the resale of up to 353,622 shares of the Company’s Class A common stock, which may be used by the selling stockholders identified therein to resell shares of the Class A common stock received by the selling stockholders upon settlement of certain restricted stock unit awards previously granted to them pursuant to the Company’s 2014 Omnibus Incentive Plan. The Company will not receive any proceeds from the sale of the Class A common stock by the selling stockholders.

The Company is filing this report to provide the legal opinion as to the validity of the securities covered by the Resale Prospectus Supplement, which opinion is attached hereto as Exhibit 5.1 and is incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d)                                 Exhibits.

2

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.

Date: February 22, 2018

3