UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 20)*

Hess Midstream LP

(Name of Issuer)

Class A Shares

(Title of Class of Securities)

428103105

(CUSIP Number)

Global Infrastructure Management LLC

Attention: Julie Ashworth

1345 Avenue of the Americas, 30^th Floor,

New York, New York 10105

(212) 315-8100

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

September 18, 2024

(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 Rule 13d-1(e), Rule 13d-1(f) or Rule 13d-1(g), check the following box. ☐

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

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).

Explanatory Note

This Amendment No. 20 to Schedule 13D amends and supplements the statement on Schedule 13D originally filed with the United States Securities and Exchange Commission on December 17, 2019 (as amended, the “Statement”), relating to the Class A Shares representing limited partner interests (the “Class A Shares”) of Hess Midstream LP, a Delaware limited partnership (the “Issuer”). Capitalized terms used herein without definition shall have the meaning set forth in the Statement.

Item 4 of the Statement is hereby amended and supplemented as follows:

September 2024 Underwriting Agreement

On September 18, 2024, the Issuer, New HESM GP LP, New HESM GP LLC, Blue Holding, and Citigroup Global Markets Inc., as underwriter (the “Underwriter”), entered into an Underwriting Agreement (the “September 2024 Underwriting Agreement”), pursuant to which the Underwriter agreed to purchase from Blue Holding, subject to and upon the terms and conditions set forth therein, 11,000,000 Class A Shares at a price of $35.12 per share (the “September 2024 Secondary Offering”). Pursuant to the September 2024 Underwriting Agreement, Blue Holding granted the Underwriter an option, exercisable for 30 days, to purchase up to an additional 1,650,000 Class A Shares at $35.12 per share. On September 20, 2024, the September 2024 Secondary Offering closed and the Underwriter exercised the option to purchase an additional 1,650,000 Class A Shares. As a result, Blue Holding redeemed an aggregate 12,650,000 OpCo Class B Units for a corresponding number of Class A Shares.

Pursuant to the September 2024 Underwriting Agreement, the Issuer, Blue Holding and Hess Investments have agreed not to sell or otherwise dispose of any Class A Shares held by them for a period ending 90 days after the date of the September 2024 Underwriting Agreement without first obtaining the written consent of the Underwriter subject to certain exceptions.

The above description of the September 2024 Underwriting Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of such agreement, which is filed as an exhibit hereto and incorporated herein by reference.

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

(a) – (b)

The following sets forth the aggregate number of Class A Shares and percentage of Class A Shares outstanding beneficially owned by each of the Reporting Persons, as well as the number of Class A Shares as to which each Reporting Person has the sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition of, or shared power to dispose or to direct the disposition of, as of the date hereof, based on 104,071,383 Class A Shares outstanding following the consummation of the September 2024 Secondary Offering:

New HESM GP LP is the record holder of 898,000 Class A Shares. HIP GP LLC is the sole member of New HESM GP LLC, which is the general partner of New HESM GP LP. HIP GP LLC is a 50/50 joint venture between Hess Investments and Blue Holding. As such, each of the foregoing entities may be deemed to beneficially own the securities held of record by New HESM GP LP.

In addition, Blue Holding is the record holder of 31,941,539 Opco Class B Units, which may be redeemed for Class A Shares on a one-for-one basis at the option of the holder.

Blue Holding GP is the general partner of Blue Holding and Blue Holding Partnership. Global GP is the sole member of Blue Holding GP. Global Investors is the sole general partner of Global GP. As a result, each of Blue Holding GP, Global GP and Global Investors may be deemed to share beneficial ownership of the Opco Class B Units held of record by Blue Holding.

Item 6 of the Statement is hereby amended and supplemented as follows:

Item 4 above summarizes certain provisions of the September 2024 Underwriting Agreement and is incorporated herein by reference. A copy of this agreement is attached as an exhibit hereto and incorporated herein by reference.

Except as set forth herein, none of the Reporting Persons or Related Persons has any contracts, arrangements, understandings or relationships (legal or otherwise) with any person with respect to any securities of the Issuer, including, but not limited to, any contracts, arrangements, understandings or relationships concerning the transfer or voting of such securities, finder’s fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or losses, or the giving or withholding of proxies.

Item 7 of the Statement is hereby amended and supplemented as follows:

SIGNATURES

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.

Date: September 20, 2024