X0206 3 2017-10-16 0 0001619739 Hess Midstream Partners LP HESM 0001720402 Blackstone Intermediary Holdco L.L.C. C/O THE BLACKSTONE GROUP L.P., 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001720499 Harvest Fund Holdco L.P. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001720405 Blackstone Harvest Holdco L.L.C. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0000792326 BLACKSTONE ADVISORY PARTNERS L.P. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY New York 0 0 1 0 0001720410 Blackstone Advisory Services L.L.C. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001464694 Blackstone Holdings I L.P. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001464695 Blackstone Holdings I/II GP Inc C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001456075 Harvest Fund Advisors LLC 100 W. LANCASTER AVENUE, SUITE 200 WAYNE PA 19087 0 0 1 0 Common Units 0 I See footnotes This Form 3 is being filed by Harvest Fund Advisors LLC ("HFA"), Harvest Fund Holdco L.P., Blackstone Harvest Holdco L.L.C., Blackstone Intermediary Holdco L.L.C., Blackstone Advisory Partners L.P., Blackstone Advisory Services L.L.C., Blackstone Holdings I L.P., Blackstone Holdings I/II GP Inc., The Blackstone Group L.P., Blackstone Group Management L.L.C. and Stephen A. Schwarzman. HFA is an investment manager to funds and separately managed accounts that own securities of the Issuer. Harvest Fund Holdco L.P. is the sole member of HFA. Blackstone Harvest Holdco L.L.C. is the general partner of Harvest Fund Holdco L.P. Blackstone Intermediary Holdco L.L.C. is the sole member of Blackstone Harvest Holdco L.L.C. Blackstone Advisory Partners L.P. is the sole member of Blackstone Intermediary Holdco L.L.C. Blackstone Advisory Services L.L.C. is the general partner of Blackstone Advisory Partners L.P. Blackstone Holdings I L.P. is the sole member of Blackstone Advisory Services L.L.C. Blackstone Holdings I/II GP Inc. is the general partner of Blackstone Holdings I L.P. The Blackstone Group L.P. is the controlling shareholder of Blackstone Holdings I/II GP Inc. The general partner of The Blackstone Group L.P. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly-owned by Blackstone's senior managing directors and controlled by its founder, Stephen A. Schwarzman. HFA, an investment adviser registered under the Investment Advisers Act of 1940, as amended, advises funds and accounts. In such capacity, HFA has voting authority and dispositive discretion over the securities of Hess Midstream Partners LP (the "Issuer") owned by such funds and accounts. The Reporting Persons may be deemed to be indirect beneficial owners of the securities owned by such funds and accounts for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), however, none of the Reporting Persons has any pecuniary interest in any of such securities. This filing shall not be deemed an admission that the Reporting Persons are subject to Section 16 of the Exchange Act or, for purposes of Section 16 of the Exchange Act or otherwise, that the Reporting Persons are the beneficial owners of any equity securities of the Issuer managed by HFA, and each Reporting Person disclaims beneficial ownership of the securities held by funds and accounts managed by HFA for purposes of Section 16 of the Exchange Act. Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 3. This Form 3 is being filed in connection with the acquisition by The Blackstone Group L.P. and certain of its affiliates ("Blackstone") of HFA, an investment management firm with over $10 billion in assets under management, on October 16, 2017. In connection with that acquisition, for purposes of Section 13(d) of the Exchange Act, Blackstone may be deemed to have become the beneficial owner of the securities beneficially owned by HFA, including the securities of the Issuer. HARVEST FUND ADVISORS LLC, By: /s/ Anthony Merhige, Name: Anthony Merhige, Title: Senior Managing Director 2017-10-26 HARVEST FUND HOLDCO L.P., By: Blackstone Harvest Holdco L.L.C., its General Partner, By: /s/ Marisa Beeney, Name: Marisa Beeney, Title: Authorized Person 2017-10-26 BLACKSTONE HARVEST HOLDCO L.L.C., By: Blackstone Intermediary Holdco LLC, S Member, By: Blackstone Advisory Partners LP, S Member, By: Blackstone Advisory Services LLC, GP, By: Blackstone Holdings I/II GP Inc., GP of S Member, By: /s/ John G. Finley, CLO 2017-10-26 BLACKSTONE INTERMEDIARY HOLDCO L.L.C., By: Blackstone Advisory Partners L.P., Sole Member, By: Blackstone Advisory Services L.L.C., GP, By: Blackstone Holdings I L.P., Sole Member, By: Blackstone Holdings I/II GP Inc., GP, By: /s/ John G. Finley, CLO 2017-10-26 BLACKSTONE ADVISORY PARTNERS L.P., By: Blackstone Advisory Services L.L.C., its GP, By: Blackstone Holdings I L.P., its Sole Member, By: Blackstone Holdings I/II GP Inc., its GP, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2017-10-26 BLACKSTONE ADVISORY SERVICES L.L.C., By: Blackstone Holdings I L.P., its Sole Member, By: Blackstone Holdings I/II GP Inc., its General Partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2017-10-26 BLACKSTONE HOLDINGS I L.P., By: Blackstone Holdings I/II GP Inc., its General Partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2017-10-26 BLACKSTONE HOLDINGS I/II GP INC., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2017-10-26