PAA unitholders elect four directors, ratify auditor, approve executive compensation at 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 2022 named executive officer compensation as follows: For Against Abstained Percentage of Votes Cast FOR* Broker Non-Votes 305,972,882 3,281,877 2,163,481 98.3% 118,539,575

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 2026 annual meeting as follows: Nominees For Withheld Percentage of Votes Cast FOR* Broker Non-Votes 1. Willie Chiang 309,138,731 2,279,510 99.3% 118,539,574 2. Ellen DeSanctis 309,854,944 1,563,297 99.5% 118,539,574 3. Alexandra Pruner 302,878,188 8,540,053 97.3% 118,539,574 4. Larry Ziemba 308,458,841 2,959,400 99.1% 118,539,574

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, 2023 as follows: For Against Abstained Percentage of Votes Cast FOR* Broker Non-Votes 423,410,208 5,114,650 1,432,957 98.5% -0-