Class A Common Stock, par value $0.0001 per share

Kinetik Holdings Inc.

2700 Post Oak Boulevard, Houston, TX, 77056-4400

Item 5(a) of the Schedule 13D is hereby amended and supplemented as follows: As of the date hereof, each of the Reporting Persons may be deemed the beneficial owner of 18,098,785 shares of Class A Common Stock, which represent approximately 18.9% of the Class A Common Stock outstanding, as calculated pursuant to Rule 13d-3(d)(1)(i) under the Act. This amount consists of (i) 928,894 shares of Class A Common Stock, (ii) 15,569,492 Common Units and an equal number of paired shares of Class C Common Stock, which together may be redeemed by the holder for shares of Class A Common Stock on a one-for-one basis (or, at the Partnership's option, an equivalent amount of cash), and (iii) 1,600,399 shares of Class A Common Stock which the Reporting Persons may acquire under the terms of the Contribution Allocation Agreement. The percentage ownership reported herein is calculated based on the sum of (i) 80,442,263 shares of Class A Common Stock outstanding as of July 31, 2026, as reported in the Issuer's quarterly report on Form 10-Q filed with the SEC on August 6, 2026, and (ii) 15,569,492 shares of Class A Common Stock issuable to the Reporting Persons upon redemption of the Common Units and corresponding shares of Class C Common Stock owned by the Reporting Persons, which shares have been added to the total shares of Class A Common Stock outstanding pursuant to Rule 13d-3(d)(1)(i) under the Act. In discussing certain agreements and arrangements in Item 4 of the Schedule 13D, the Reporting Persons (including through certain of their affiliates) describe arrangements involving Blackstone and Apache and certain of their respective affiliates. However, neither the filing of the Schedule 13D (including this Amendment No. 15) nor any of its contents shall be deemed to constitute an admission that the Reporting Persons are members of a "group" for purposes of Section 13(d) of the Act with such other persons. Each Reporting Person disclaims being a member of a "group" with Blackstone, Apache and/or their respective affiliates and further disclaims beneficial ownership of the shares of Class A Common Stock that may be deemed to be beneficially owned by such persons.

Item 5(b) of the Schedule 13D is hereby amended and supplemented as follows: Each of the Reporting Persons may be deemed to have shared, not sole, power to vote or to direct the vote, and shared, not sole, power to dispose or to direct the disposition, of the 18,098,785 shares of Class A Common Stock reported herein as beneficially owned by the Reporting Persons.

Item 5(c) of the Schedule 13D is hereby amended and supplemented as follows: The response to Item 3 of this Amendment No. 15 is hereby incorporated by reference herein. Except as set forth in Item 3 and Exhibit N of this Amendment No. 15, the Reporting Persons have not effected any transactions in the Class A Common Stock in the past 60 days.