PLAINS ALL AMERICAN PIPELINE LP

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On May 11, 2026, the board of directors (the “Board”) of Plains All American Pipeline, L.P.’s (the “Registrant”) general partner, PAA GP Holdings LLC (the “Company”), appointed Cynthia B. Taylor as an independent member of the Board serving in Class III. Ms. Taylor will also serve as a member of the Compensation Committee and the Health, Safety, Environmental and Sustainability Committee. The Board has responsibility for managing the business and affairs of the Registrant and of Plains GP Holdings, L.P. (“PAGP”). Ms. Taylor has over 30 years of energy industry experience, most recently serving as Chief Executive Officer and President of Oil States International, Inc. and as a member of the Oil States Board of Directors. She held these positions from May 2007 until her retirement from Oil States in May 2026. From May 2006 until May 2007, Ms. Taylor served as President and Chief Operating Officer of Oil States and served as Senior Vice President - Chief Financial Officer and Treasurer prior to that. From August 1999 to May 2000, Ms. Taylor was the Chief Financial Officer of L.E. Simmons & Associates, Incorporated. Ms. Taylor served as the Vice President - Controller of Cliffs Drilling Company from July 1992 to August 1999 and held various management positions with Ernst & Young LLP, a public accounting firm, from January 1984 to July 1992. Ms. Taylor was a director of the Federal Reserve Bank of Dallas from January 2020 through December 31, 2025 and served as a director of the Federal Reserve Bank's Houston Branch from 2018 to 2019. She has also served as a director of AT&T Inc. since 2013 and serves as chair of the AT&T audit committee. She received a B.B.A. in Accounting from Texas A&M University and is a Certified Public Accountant. Consistent with our compensation program for non-employee directors, Ms. Taylor will receive an annual cash retainer of $120,000 for service as a Board member. She will also receive an annual grant of phantom Class A Shares of PAGP having a market value on the date of grant equal to approximately $160,000 (based on a volume weighted average price for the 10-trading day period beginning five days before and ending five days after the ex-dividend date immediately preceding the date of grant). These annual grants will vest (become payable in Class A Shares of PAGP) one year from the date of grant and include associated distribution equivalent rights.

Item 7.01. Regulation FD Disclosure. In accordance with General Instruction B.2 of Form 8-K, the information presented under this Item 7.01 shall not be deemed “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, each as amended. On May 11, 2026, the Registrant issued a press release announcing the appointment of Ms. Taylor to the Board of the Company. A copy of the press release is furnished as Exhibit 99.1 hereto.