(Rule 13d-101)

Under the Securities Exchange Act of 1934
(Amendment No. 6)*

(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).

2

3

4

5

Item 1. Security and Issuer.

This Amendment No. 6 to Schedule 13D (Amendment No. 6) amends and supplements or restates (where indicated) the statement on Schedule 13D originally filed with the Securities and Exchange Commission (the Commission) on May 26, 2015, as amended by Amendment No. 1 to Schedule 13D filed with the Commission on June 22, 2017, Amendment No. 2 to Schedule 13D filed with the Commission on February 22, 2018, Amendment No. 3 to Schedule 13D filed with the Commission on April 27, 2018, Amendment No. 4 to Schedule 13D filed with the Commission on May 22, 2018 and Amendment No. 5 to Schedule 13D filed with the Commission on July 23, 2018 (as amended, Schedule 13D), and relates to common units (Common Units) representing limited partner interests of EQGP Holdings, LP (formerly known as EQT GP Holdings, LP), a Delaware limited partnership (the Issuer). The principal executive offices of the Issuer are located at 625 Liberty Avenue, Suite 2000, Pittsburgh, Pennsylvania 15222. Capitalized terms used in this Amendment No. 6 and not defined herein shall have the meanings ascribed to them in Schedule 13D.

The purpose of this Amendment No. 6 is to report that as a result of an internal reorganization of EQT Corporation’s (EQT) wholly owned subsidiaries, the Common Units previously held directly by certain subsidiaries of EQT have been transferred to and are now held directly by Equitrans Midstream Holdings, LLC, a Delaware limited liability company (EMH). EMH and Equitrans Gathering Holdings, LLC (formerly known as EQT Gathering Holdings, LLC), a Delaware limited liability company (Gathering Holdings) are wholly owned direct subsidiaries of Equitrans Midstream Corporation, a Pennsylvania corporation and a direct wholly owned subsidiary of EQT (ETRN). The internal reorganization resulted in no change to the aggregate amount of Common Units beneficially owned by EQT. Except as set forth below, all Items of Schedule 13D remain unchanged.

Item 2. Identity and Background.

Item 2 of Schedule 13D is hereby amended and restated in its entirety as follows:

(a)           This Schedule 13D is jointly filed pursuant to a Joint Filing Agreement attached hereto as Exhibit A by (i) Gathering Holdings, (ii) EMH, (iii) ETRN and (iv) EQT(EQT, Gathering Holdings, EMH and ETRN are collectively referred to herein as  the Reporting Persons).

Gathering Holdings is a limited partner of the Issuer holding approximately 79.2% of the outstanding Common Units, and is the sole stockholder of EQM GP Corporation (formerly known as EQT GP Corporation), a Delaware corporation and limited partner of the Issuer holding approximately 0.1% of the outstanding Common Units (GP Corporation). Gathering Holdings is also the sole member of EQGP Services, LLC (formerly known as EQT GP Services, LLC), a Delaware limited liability company and the general partner of the Issuer (the General Partner). EMH is also a limited partner of the Issuer holding approximately 12.0% of the outstanding Common Units. ETRN is the sole member of Gathering Holdings and EMH. EQT is a publicly traded company and the sole shareholder of ETRN. Gathering Holdings and EMH are manager-managed limited liability companies with boards of managers. ETRN and EQT are corporations with boards of directors. The Reporting Persons are hereby filing a joint Schedule 13D.

(b)           The business address of each Reporting Person other than EQT is 625 Liberty Avenue, Suite 2000, Pittsburgh, Pennsylvania, 15222.

The business address of EQT is 625 Liberty Avenue, Suite 1700, Pittsburgh, Pennsylvania, 15222.

(c)           The principal business of ETRN is to directly and indirectly hold investments in the entities conducting EQT’s midstream business, including the Common Units, all of the membership interests in the General Partner, a limited partner interest in EQM Midstream Partners, LP (EQM), a publicly traded limited partnership formed by EQT to own, operate, acquire and develop midstream assets in the Appalachian Basin and interests in other subsidiaries of EQT which are engaged in natural gas midstream commercial activities. The principal business of each of EMH and Gathering Holdings is to serve as an intercompany holding company of assets and subsidiaries of ETRN. EQT conducts its business through four business segments: EQT Production, EQM Gathering, EQM Transmission and EQM Water. EQT Production is the leading natural gas producer in the United States, based on average daily sales volumes, with 21.4 Tcfe of proved natural gas, natural gas liquids and crude oil reserves across approximate 4.0 million gross acres, including approximately 1.1 million gross acres in the Marcellus play, many of which have associated deep Utica or Upper Devonian drilling rights, and approximately 0.1 million gross acres in the Ohio Utica as of December 31, 2017. EQM Gathering and EQM Transmission provide gathering, transmission and storage services for EQT’s produced gas, as well as for independent third parties across the Appalachian Basin through EQT’s ownership and control of EQM. EQM Water provides water services that support well completion activities and collects and recycles or disposes of flowback and produced water for EQT and third parties in Washington and Green Counties, Pennsylvania and Belmont County,

6

Ohio also through EQM.

The name and present principal occupation of each director, manager and, in the case of ETRN and EQT, executive officer of the Reporting Persons (Covered Individuals) are set forth in the tables below.

The Covered Individuals, together with the Reporting Persons, are collectively referred to herein as the “Covered Persons.”

All Covered Individuals are United States citizens. The business address of each of the Covered Individuals is c/o EQT Corporation, 625 Liberty Avenue, Suite 1700, Pittsburgh, Pennsylvania 15222.

(d)—(e)  During the past five years, none of the Reporting Persons has and, to the Reporting Persons’ knowledge, none of the Covered Individuals has (i) been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) nor

7

(ii) been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of which was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f)            Not applicable.

Item 3. Source and Amount of Funds or Other Consideration.

Item 3 of Schedule 13D is hereby amended and supplemented by incorporating by reference herein the information set forth in Item 4 of this Amendment No. 6 regarding the Internal Reorganization.

Item 4. Purpose of Transaction.

Item 4 of Schedule 13D is hereby amended and supplemented by adding the following additional disclosures:

Internal Reorganization

As previously announced on February 21, 2018, the Board of Directors of EQT (the Board) approved a plan to separate its upstream and midstream businesses (the Separation), creating a standalone publicly traded corporation, ETRN, that will focus on midstream operations. Following the Separation, ETRN will be an independent public company that directly and indirectly holds investments in the entities conducting the midstream business formerly owned by EQT.  On October 24, 2018, the Board approved the completion of the Separation by means of a pro rata distribution (the Distribution) by EQT of 80.1 percent of the outstanding common stock of ETRN to EQT’s shareholders of record as of the close of business on November 1, 2018.

In connection with the Separation and the Distribution, EQT and its wholly owned subsidiaries underwent an internal restructuring (the Internal Reorganization) pursuant to which, among other things, (i) effective as of October 22, 2018, Rice Midstream GP Holdings, LP, a Delaware limited partnership and wholly owned indirect subsidiary of EQT, which was the record and beneficial owner of 36,293,766 Common Units, merged with and into EMH, and (ii) effective as of October 26, 2018 (A) EQT Production Company, a Pennsylvania corporation and wholly owned indirect subsidiary of EQT (EPC), contributed all of the outstanding membership interests of Gathering Holdings to ETRN (B) EPC distributed all of the outstanding membership interests in EMH and all of the outstanding shares of common stock of ETRN to EQT Investments Holdings, LLC, a Delaware limited liability company and wholly owned subsidiary of EQT (Investments Holdings), (C) Investments Holdings distributed all of the outstanding membership interests in EMH and all of the outstanding shares of common stock of ETRN to EQT, and (D) EQT contributed all of the outstanding membership interests in EMH to ETRN.

Item 5. Interest in Securities of the Issuer.

Item 5 of Schedule 13D is hereby amended and restated in its entirety as follows:

(a)           (1)           As of October 26, 2018, the number of Common Units issued and outstanding is 302,458,766. As of October 26, 2018, EMH is the record and beneficial owner of 36,293,766 Common Units, which represent approximately 12.0% of the outstanding Common Units.

(2)           As of October 26, 2018, Gathering Holdings is the record and beneficial owner of 239,449,000 Common Units, which represent approximately 79.2% of the outstanding Common Units, and, through its sole ownership of GP Corporation, Gathering Holdings may be deemed to beneficially own an additional 266,000 Common Units, which represent approximately 0.1% of the outstanding Common Units.

(3)           ETRN does not directly own any Common Units; however, as the sole member of Gathering Holdings and EMH, it may be deemed to beneficially own the 239,715,000 Common Units beneficially owned by Gathering Holdings and the 36,293,766 Common Units beneficially owned by EMH, which represent in the aggregate approximately 91.3% of the outstanding Common Units.

(4)           EQT does not directly own any Common Units; however, as the sole shareholder of ETRN and indirect owner of Gathering Holdings and EMH, it may be deemed to beneficially own the 239,715,000 Common Units beneficially owned by Gathering Holdings and the 36,293,766 Common Units beneficially owned by EMH, which represent in the aggregate approximately 91.3% of the outstanding Common Units.

8

(5)           In addition, as of the date hereof, certain of the Covered Individuals beneficially own the number and percentage of Common Units set forth in the following table:

  *Less than 1% of the class beneficially owned.

(1) Includes 12,300 Common Units beneficially owned that are held in the Cary Foundation, Inc. in which Mr. Cary has sole voting and investment power.

(2) Includes 11,751 phantom units granted under the 2015 EQT GP Services, LLC 2015 Long-Term Incentive Plan, which have the economic equivalent of 11,751 Common Units and represent compensation that is deferred until retirement.

(b)           The information set forth in Items 7 through 11 of the cover pages hereto is incorporated herein by reference. To the Reporting Persons’ knowledge, each of the Covered Individuals listed in the table in Item 5(a) has sole voting power and dispositive power with respect to all of the Common Units reported for him or her in the table in Item 5(a).

(c)           Except as described in Item 4 above or elsewhere in this Schedule 13D, none of the Reporting Persons or, to the Reporting Persons’ knowledge, the Covered Individuals, has effected any transactions in the Common Units during the past 60 days.

(d)           GP Corporation has the right to receive distributions from, and the proceeds from the sale of, the 266,000 Common Units for which it is the registered holder. The Reporting Persons also have the right to receive distributions from, and the proceeds from the sale of, the respective Common Units reported by such persons on the cover page of this Schedule 13D and in this Item 5. Except for the foregoing and the cash distributions described in Item 6 below, no other person is known by the Reporting Persons to have the right to receive or the power to direct the receipt of distributions from, or the proceeds from the sale of, Common Units beneficially owned by the Reporting Persons or, to the Reporting Persons’ knowledge, the Covered Individuals.

(e)           Not applicable.

9

Item 7. Material to be Filed as Exhibits.

Item 7 of Schedule 13D is hereby amended and restated in its entirety as follows:

10

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.

Dated: October 26, 2018

[Signature Page to Schedule 13D/A for EQGP Holdings, LP]

11

EXHIBIT INDEX

12

EXHIBIT A

Joint Filing Agreement

We, the undersigned, hereby express our agreement that the attached Schedule 13D is, and any further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934. This agreement may be terminated with respect to the obligations to jointly file future amendments to such statement on Schedule 13D as to any of the undersigned upon such person giving written notice thereof to each of the other persons signatory hereto, at the principal office thereof.

Dated: October 26, 2018

[Signature Page Follows]

13

[Signature Page to Joint Filing Agreement to Schedule 13D/A for EQGP Holdings, LP]

14