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): August 15, 2018
NuStar Energy L.P.
(Exact name of registrant as specified in its charter)

Delaware | 001-16417 | 74-2956831
(State or other jurisdiction of incorporation) | (Commission File Number) | (I.R.S. Employer Identification No.)
| 19003 IH-10 West San Antonio, Texas 78257 |
| (Address of principal executive offices) |
| (210) 918-2000 |
| (Registrant’s telephone number, including area code) |
| 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:
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 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 7.01 Regulation FD Disclosure.
Senior management of NuStar Energy L.P. (the “Partnership”) is meeting with members of the investment community at the 2018 Citi One-on-One MLP/Midstream Infrastructure Conference in Las Vegas, Nevada on Wednesday, August 15, 2018, and Thursday, August 16, 2018. The slides attached to this report were prepared in connection with, and are being used during, the conference. The slides are included in Exhibit 99.1 to this report and are incorporated herein by reference. The slides will be available in the “Investors” section of the Partnership’s website at www.nustarenergy.com at 11:30 a.m. (Eastern Time) on August 15, 2018.
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits.

Exhibit Number |  | EXHIBIT
Exhibit 99.1 |  | Slides to be used on August 15-16, 2018.

2

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.

| NUSTAR ENERGY L.P.
| By: | Riverwalk Logistics, L.P.
|  | its general partner
|  | By: | NuStar GP, LLC
|  |  | its general partner
Date: August 15, 2018 |  |  | By: | /s/ Amy L. Perry
|  |  | Name: | Amy L. Perry
|  |  | Title: | Senior Vice President, General Counsel - Corporate & Commercial Law and Corporate Secretary

3