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): March 5, 2015

NGL ENERGY PARTNERS LP

(Exact name of registrant as specified in its charter)

6120 South Yale Avenue

Suite 805

Tulsa, Oklahoma 74136

(Address of principal executive offices) (Zip Code)

(918) 481-1119

(Registrant’s telephone number, including area code)

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:

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))

Item 1.01.  Entry into a Material Definitive Agreement

On March 5, 2015, NGL Energy Partners LP (the “Partnership”) entered into an Underwriting Agreement (the “Underwriting Agreement”) with Barclays Capital Inc. (the “Underwriter”) pursuant to which the Partnership agreed to sell to the Underwriter up to 7,187,500 common units (the “Units”) representing limited partner interests in the Partnership (including 937,500 Units pursuant to the Underwriter’s option to purchase additional Units) at a price to the public of $27.57 per Unit (or $27.35 per Unit, net of underwriting discounts and commissions in the amount of $0.22 per Unit).  The Units have been registered under the Securities Act of 1933, as amended (the “Securities Act”), pursuant to a Registration Statement on Form S-3 (File No. 333-189842) of the Partnership and the base prospectus, dated July 8, 2013, included therein, as supplemented by the prospectus supplement, dated March 5, 2015, relating to the Units, filed with the Securities and Exchange Commission (the “Commission”) pursuant to Rule 424(b)(5) of the Securities Act on March 9, 2015. Legal opinions relating to the Units are included as Exhibits 5.1 and 8.1 hereto.

The Underwriting Agreement contains customary representations, warranties and agreements by the Partnership, and customary conditions to closing, indemnification obligations of the Partnership and the Underwriter, including for liabilities under the Securities Act, other obligations of the parties and termination provisions. The summary of the Underwriting Agreement in this report does not purport to be complete and is qualified in its entirety by reference to the full text of the Underwriting Agreement, which is filed as Exhibit 1.1 hereto, and is incorporated herein by reference.

The offering closed on March 11, 2015.  The Partnership received net proceeds from the offering of approximately $170.4 million.  As described in the prospectus supplement, the Partnership intends to use the net proceeds from the offering to repay borrowings under its revolving credit facility and for general partnership purposes, including capital expenditures and potential acquisitions.

The Underwriter may, from time to time, engage in transactions with and perform services for the Partnership and its affiliates in the ordinary course of business. An affiliate of the Underwriter is a lender under the Partnership’s revolving credit facility and, accordingly, will receive a portion of the net proceeds from the offering.

Item 8.01.  Other Events

On March 5, 2015, the Partnership issued a press release announcing that it had commenced the offering of the Units. On March 6, 2015, the Partnership issued a press release announcing that it had priced the offering of the Units. Copies of the press releases are furnished as Exhibits 99.1 and 99.2 hereto and are incorporated herein by reference.

Item 9.01.  Financial Statements and Exhibits.

(d) Exhibits

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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.

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EXHIBIT INDEX

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