PAA unitholders elect four directors, ratify auditor, approve say-on-pay at 2026 annual meeting

3. Unitholders (other than Plains AAP, L.P.) voted to instruct PAA to vote the PAGP Class C shares that it owns at the PAGP annual meeting on the approval, on a non-binding advisory basis, of our 2025 named executive officer compensation as follows: Percentage of Votes Cast For Against Abstained FOR* Broker Non-Votes 188,931,812 121,666,547 1,474,133 60.5% 129,903,521

2. Unitholders (other than Plains AAP, L.P.) voted to instruct PAA to vote the PAGP Class C shares that it owns at the PAGP annual meeting on the ratification of the appointment of PricewaterhouseCoopers LLP as PAGP’s and PAA’s independent registered public accounting firm for the fiscal year ending December 31, 2026 as follows: Percentage of Votes Cast For Against Abstained FOR* Broker Non-Votes 437,632,921 3,758,542 584,550 99.0% -0-

1. Unitholders (other than Plains AAP, L.P.) voted to instruct PAA to vote the PAGP Class C shares that it owns at the PAGP annual meeting on the election of four Class I directors to serve on the board of directors of PAA GP Holdings LLC until the 2029 annual meeting as follows: Percentage of Votes Cast Nominees For Withheld FOR* Broker Non-Votes 1. Willie Chiang 305,596,109 6,476,382 97.9% 129,903,522 2. Ellen DeSanctis 306,878,470 5,194,021 98.3% 129,903,522 3. Alexandra Pruner 304,958,788 7,113,703 97.7% 129,903,522 4. Larry Ziemba 306,095,853 5,976,638 98.1% 129,903,522