Under the Securities Exchange Act of 1934
(Amendment No. 1)

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d–1(e), 240.13d–1(f) or 240.13d–1(g), check the following box. o

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d–7 for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Note 1: Based on 49,147,164 Common Units issued and outstanding as of June 7, 2013 as reported on the Issuer’s Annual Report on Form 10-K for the year ended December 31, 2012. Outstanding units do not include 5,919,346 subordinated units, of which the reporting person owns none.

2

Note 1: Solely in its capacity as a member holding a majority interest in EMG NGL HC, LLC.  Beneficial ownership of the Common Units referred to herein is being reported hereunder solely because the reporting person may be deemed to beneficially own such securities as a result of its status as a member holding a majority interest in EMG NGL HC, LLC. Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any Reporting Person that it is the beneficial owner of any of the securities referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed.  See Items 4 and 5.

Note 2: Based on 49,147,164 Common Units issued and outstanding as of June 7, 2013 as reported on the Issuer’s Annual Report on Form 10-K for the year ended December 31, 2012. Outstanding units do not include 5,919,346 subordinated units, of which the reporting person owns none.

3

Note 1: Solely in its capacity as the general partner of NGP Midstream & Resources, L.P, a member holding a majority interest in EMG NGL HC, LLC. Beneficial ownership of the Common Units referred to herein is being reported hereunder solely because the reporting person may be deemed to beneficially own such securities as a result its status as the general partner of NGP Midstream & Resources, L.P., a member holding a majority interest in EMG NGL HC, LLC. Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any Reporting Person that it is the beneficial owner of any of the securities referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed.  See Items 4 and 5.

Note 2: Based on 49,147,164 Common Units issued and outstanding as of June 7, 2013 as reported on the Issuer’s Annual Report on Form 10-K for the year ended December 31, 2012. Outstanding units do not include 5,919,346 subordinated units, of which the reporting person owns none.

4

Note 1:  Solely in its capacity as the general partner of NGP MR, LP, the general partner of NGP Midstream & Resources, LLC, a member holding a majority interest in EMG NGL HC, LLC. Beneficial ownership of the Common Units referred to herein is being reported hereunder solely because the reporting person may be deemed to beneficially own such securities as a result of the LLC Agreement described in Item 5 hereof. Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any Reporting Person that it is the beneficial owner of any of the securities referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed.  See Items 5 and 5.

Note 2: Based on 49,147,164 Common Units issued and outstanding as of June 7, 2013 as reported on the Issuer’s Annual Report on Form 10-K for the year ended December 31, 2012. Outstanding units do not include 5,919,346 subordinated units, of which the reporting person owns none.

5

Note 1: Solely in his capacity as the Chief Executive Officer and Managing Partner of NGP MR GP, LLC, the general partner of NGP MR, LP, the general partner of NGP Midstream & Resources, LLC, a member holding a majority interest in EMG NGL HC, LLC. Beneficial ownership of the Common Units referred to herein is being reported hereunder solely because the reporting person may be deemed to beneficially own such securities as a result of the LLC Agreement described in Item 5 hereof. Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any Reporting Person that it is the beneficial owner of any of the securities referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed.  See Items 4 and 5.

Note 2: Based on 49,147,164 Common Units issued and outstanding as of June 7, 2013 as reported on the Issuer’s Annual Report on Form 10-K for the year ended December 31, 2012. Outstanding units do not include 5,919,346 subordinated units, of which the reporting person owns none.

6

Note 1: Solely in his capacity as the Chief Operating Officer and Managing Partner of NGP MR GP, LLC, the general partner of NGP MR, LP, the general partner of NGP Midstream & Resources, LLC, a member holding a majority interest in EMG NGL HC, LLC. Beneficial ownership of the Common Units referred to herein is being reported hereunder solely because the reporting person may be deemed to beneficially own such securities as a result of the LLC Agreement described in Item 5 hereof. Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any Reporting Person that it is the beneficial owner of any of the securities referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed.  See Items 4 and 5.

Note 2: Based on 49,147,164 Common Units issued and outstanding as of June 7, 2013 as reported on the Issuer’s Annual Report on Form 10-K for the year ended December 31, 2012. Outstanding units do not include 5,919,346 subordinated units, of which the reporting person owns none.

7

This Amendment No. 1 to Schedule 13D is filed by the Reporting Persons as an amendment to the Schedule 13D filed with the Securities and Exchange Commission on May 17, 2013 (as amended, this “Schedule 13D”).  This Amendment No. 1 relates to common units representing limited partner interests (“NGL Common Units”) in NGL Energy Partners, L.P., a Delaware limited partnership (the “Issuer”).  Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to such terms in the original Schedule 13D.  Only those items of the Schedule 13D that are being amended hereby are included herein, and each such amended item that is included in this Amendment No. 1 is restated in its entirety as amended hereby.

Item 4.                                                         Purpose of Transaction.

Item 4 is hereby amended and restated in its entirety as follows:

(a)                                 On June 19, 2012, the Issuer completed mergers with High Sierra and High Sierra Energy GP, LLC (“High Sierra GP”) pursuant to, respectively, (i) an Agreement and Plan of Merger, dated as of May 18, 2012 and attached hereto as Exhibit 1 (the “Merger Agreement”), by and among the Issuer, NGL Energy Holdings LLC, the general partner of the Issuer (“NGL GP”), HSELP LLC, a direct, wholly-owned subsidiary of the Issuer (“HSELP”), High Sierra and High Sierra GP and (ii) an Agreement and Plan of Merger, dated as of May 18, 2012 and attached hereto as Exhibit 2 (the “GP Merger Agreement”), by and among NGL GP, High Sierra GP and HSEGP LLC, a direct, wholly-owned subsidiary of NGL GP. The Merger Agreement and GP Merger Agreement provided for, respectively, (i) the acquisition of High Sierra by the Issuer, whereby HSELP merged with and into High Sierra with High Sierra as the surviving entity and (ii) the acquisition of High Sierra GP by NGL GP, whereby HSEGP merged with and into High Sierra GP with High Sierra GP as the surviving entity (collectively, the “Merger”).

In connection with the Merger, the Issuer paid aggregate consideration of $693 million, including $153 million in cash, assumed indebtedness of $95 million and $445 million in equity. Pursuant to the Merger Agreement, each common unit representing limited partner interests in High Sierra (the “High Sierra Units”) was converted into the right to receive cash and NGL Common Units, based on a value of $21.50 per NGL Common Unit. As such, EMG NGL HC received 5,696,634 NGL Common Units in exchange for its High Sierra Units. Additionally, the Issuer’s membership interest in HSELP was converted into a 99% limited partner interest in High Sierra, as the surviving entity.

On June 6, 2013, EMG NGL HC sold 2,000,000 NGL Common Units at a price of $27.30 per NGL Common Unit pursuant to a Unit Purchase Agreement dated June 3, 2013 (the “June 3 Unit Purchase Agreement”).

On June 21, 2013, EMG NGL HC sold 1,000,000 NGL Common Units at a price of $28.13 per NGL Common Unit pursuant to a Unit Purchase Agreement dated June 21, 2013 (the “June 21 Unit Purchase Agreement”).

(b)                                 See (a) above.

8

(c)                                  Not applicable.

(d)                                 Pursuant to Section 5.13 of the GP Merger Agreement, Patrick Wade was appointed by EMG NGL HC to the Board of Directors of NGL GP. NGL GP controls the Issuer through its directors. Other than the appointment of Mr. Wade in connection with the Merger, none of the Reporting Persons has any plan or proposal of the type referred to in clause (d) of Item 4 of Schedule 13D.

(e)                                  Not applicable.

(f)                                   Not applicable.

(g)                                  Not applicable.

(h)                                 Not applicable.

(i)                                     Not applicable.

(j)                                    Not applicable.

References to and descriptions of the Merger, the Merger Agreement and the GP Merger Agreement in this Item 4 are qualified in their entirety by reference to the Merger Agreement and the GP Merger Agreement, which are filed as Exhibit 2 and Exhibit 3, respectively, to the original Schedule 13D and are incorporated into this Item 4 by reference.

The NGL Common Units described herein were acquired for investment purposes.

The Reporting Persons will continuously evaluate the Issuer’s businesses and prospects, alternative investment opportunities and all other factors deemed relevant in determining whether additional NGL Common Units will be acquired by any of the Reporting Persons or by other affiliated investment funds and accounts or whether any of the Reporting Persons or any such other affiliated investment funds and accounts will dispose of units. At any time, additional units may be acquired or some or all of the units beneficially owned by the Reporting Persons may be sold, in either case in the open market, in privately negotiated transactions or otherwise. Other than as described in this Schedule 13D, none of the Reporting Persons or, to their best knowledge, any Covered Persons have any current plans or proposals that would be related to or would result in any of the matters described in Items 4(a)-(j) of Schedule 13D; however, as part of its ongoing evaluation of this investment and investment alternatives, the Reporting Persons may consider such matters in the future and, subject to applicable law, may formulate a plan with respect to such matters, and, from time to time, the Reporting Persons may hold discussions with or make formal proposals to management or the Board, other holders of units or other third parties regarding such matters.

9

Item 5.                                 Interest in Securities of the Issuer.

Item 5 is hereby amended and restated in its entirety as follows:

(a)         The information contained on the cover pages and in Items 2 and 4(a) of this Schedule 13D is incorporated herein by reference.

After giving effect to the Merger Agreement and the transactions contemplated thereby, EMG NGL HC became the beneficial owner of 5,696,634 NGL Common Units.  Pursuant to the June 3 Unit Purchase Agreement and the June 21 Unit Purchase Agreement, EMG NGL HC disposed of 2,000,000 NGL Common Units and 1,000,000 NGL Common Units, respectively, leaving EMG NGL HC with 2,696,634 NGL Common Units representing an approximate 5.5% interest in the Issuer. By nature of its controlling 65% membership interest in EMG NGL HC, EMG Fund I may be deemed a beneficial owner of the 2,696,634 NGL Common Units held by EMG NGL HC. As the general partner of EMG Fund I, EMG Fund I GP may be deemed a beneficial owner of the 2,696,634 NGL Common Units held by EMG NGL HC. As the general partner of EMG Fund I GP, Ultimate GP may be deemed a beneficial owner of the 2,696,634 NGL Common Units held by EMG NGL HC.

Pursuant to authority granted to them under the Limited Liability Company Agreement of Ultimate GP, dated February 16, 2007 (the “LLC Agreement”), John T. Raymond and John G. Calvert, as Chief Executive Officer and Managing Partner and as Chief Operating Officer and Managing Partner, respectively, of Ultimate GP, as the general partner of EMG Fund I GP, as the general partner of EMG Fund I, and by nature of EMG Fund I’s controlling 65% membership interest in EMG NGL HC, may be deemed beneficial owners of the 2,696,634 NGL Common Units held by EMG NGL HC. Additionally, the terms of the LLC Agreement require that the Chief Executive Officer of Ultimate GP only take action when such action is also approved by another officer of Ultimate GP.  John T Raymond and John G. Calvert are the only officers of Ultimate GP, and they may not be removed nor may additional officers be appointed without the unanimous consent of the members of Ultimate GP. As such, the approval of both John T. Raymond and John G. Calvert is required for action to be taken on behalf of Ultimate GP, including the voting or disposition of investment securities.

The aforementioned ownership percentages are based on 49,147,164 NGL Common Units issued and outstanding as of June 7, 2013 as reported on the Issuer’s Annual Report on Form 10-K for the year ended December 31, 2012. Outstanding units do not include 5,919,346 subordinated units, of which the reporting person owns none.

Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission by any of the Reporting Persons (other than by EMG NGL HC, solely with respect to its direct holdings of the NGL Common Units) that it is the beneficial owner of any of the NGL Common Units referred to herein for the purposes of Section 13(d) of the Act or for any other purpose, and such beneficial ownership is expressly disclaimed by each Reporting Person (other than by EMG NGL HC, solely with respect to its direct holdings of the NGL Common Units) except to the extent of such Reporting Person’s pecuniary interest, if any, in the NGL Common Units.

10

To the knowledge of the Reporting Persons, none of the Covered Persons directly owns any NGL Common Units; provided, however, that because of each Covered Persons’ status as a manager, general partner, director, executive officer or member of a Reporting Person, a Covered Person may be deemed to be the beneficial owner of the NGL Common Units beneficially owned by such Reporting Person. Each of the Covered Persons disclaims beneficial ownership of the NGL Common Units reported herein and the filing of this Schedule 13D shall not be construed as an admission that any such Covered Person is the beneficial owner of any securities covered by this statement, except to the extent of such Covered Person’s pecuniary interest, if any, in the NGL Common Units.

(b)         The Reporting Persons may be deemed to have shared voting or dispositive power of the 2,696,634 Common Units held by EMG NGL HC due to the terms of the LLC Agreement requiring that the Chief Executive Officer of Ultimate GP only take action when such action is also approved by another officer of Ultimate GP.  John T Raymond and John G. Calvert, the Chief Executive Officer and Managing Partner and Chief Operating Officer and Managing Partner of Ultimate GP, respectively, are the only officers of Ultimate GP, and they may not be removed nor may additional officers be appointed without unanimous consent of the members of Ultimate GP. As such, the approval of both John T. Raymond and John G. Calvert is required for action to be taken on behalf of Ultimate GP, including the voting or disposition of investment securities.

(c)          Except as set forth in this Schedule 13D, none of the Reporting Persons has effected any transactions in NGL Common Units since the filing of the original Schedule 13D on May 17, 2013.

(d)         Not applicable.

(e)          Not applicable.

[Signatures Follow]

11

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this Statement is true, complete and correct.

12

13