Amendment: SEC Form SCHEDULE 13D/A filed by Hess Midstream LP

Item 4 of the Statement is hereby amended and supplemented as follows: May 2025 Underwriting Agreement On May 28, 2025, the Issuer, New HESM GP LP, New HESM GP LLC, Blue Holding, and J.P. Morgan Securities LLC and Citigroup Global Markets Inc., as underwriters (the "Underwriters"), entered into an Underwriting Agreement (the "May 2025 Underwriting Agreement"), pursuant to which the Underwriters agreed to purchase from Blue Holding, subject to and upon the terms and conditions set forth therein, 15,022,517 Class A Shares at a price of $36.86 per share, comprising of (i) 449,000 Class A Shares indirectly owned by Blue Holding through its ownership of 50% of the limited liability company interests in New HESM GP LP and (ii) 14,573,517 Class A Shares issuable upon Blue Holding's redemption of a corresponding number of OpCo Class B Units (the "May 2025 Secondary Offering"). In connection with the May 2025 Secondary Offering, New HESM GP LP equally distributed all the Class A Shares and Class B Shares it held to Hess Investments and Blue Holding. On May 30, 2025, the May 2025 Secondary Offering closed. Pursuant to the May 2025 Underwriting Agreement, the Issuer and Hess Investments have agreed not to sell or otherwise dispose of any Class A Shares held by them for a period ending 60 days after the date of the May 2025 Underwriting Agreement without first obtaining the written consent of the Underwriters subject to certain exceptions. The above description of the May 2025 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. Governance Changes As of closing of the May 2025 Secondary Offering, Blue Holding no longer holds a direct or indirect ownership interest in any of the Issuer, New HESM GP LLC, New HESM GP LP or HIP GP LLC. As a result, Hess Investments now owns 100% interest in HIP GP LLC. Consequently, the three directors of the Issuer appointed by Blue Holding have resigned from the Issuer's board of directors effective as of the date hereof. The directors appointed by the Reporting Persons will continue to have the voting power necessary to control the day-to-day management and operation of the business and assets of the Issuer, subject to certain actions with respect to the Issuer's business which will require the approval of at least one of the Reporting Persons' director appointments and one independent director.

The information contained on the cover pages is incorporated by reference to this Item 5. The information on the cover pages sets forth the aggregate number of Class A Shares and percentage of Class A Shares outstanding beneficially owned by each of the Reporting Persons, based on 131,084,592 Class A Shares outstanding as of the closing of the May 2025 Secondary Offering.

The information contained on the cover pages is incorporated by reference to this Item 5. Hess Investments is the record holder of (i) 449,000 Class A Shares and (ii) 78,979,190 Opco Class B Units, which may be redeemed for Class A Shares on a one-for-one basis at the option of the holder. Hess Investments is an indirect, wholly owned subsidiary of Hess Corporation. As a result, Hess Corporation may be deemed to share beneficial ownership of the securities held of record by Hess Investments and New HESM GP LP.

Except as described in Item 4, none of the Reporting Persons nor Related Persons has effected any transactions in the Class A Shares or Opco Class B Units since Amendment No. 21.

None.

Not applicable.

Item 6 of the Statement is hereby amended and supplemented as follows: Item 4 above summarizes certain provisions of the May 2025 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: Exhibit 24**: Underwriting Agreement, dated as of May 28, 2025, by and among Hess Midstream LP, Hess Midstream GP LP, Hess Midstream GP LLC, GIP II Blue Holding, L.P., J.P. Morgan Securities LLC and Citigroup Global Markets Inc. (incorporated by reference to Exhibit 1.1 to the Issuer's Current Report on Form 8-K filed on May 30, 2025). ** Certain confidential portions of this Exhibit were omitted by means of marking such portions with brackets ("[***]") because the identified confidential portions (i) are not material and (ii) is the type of information that the registrant treats as private or confidential.