Form 8-K

8-K — PLAINS ALL AMERICAN PIPELINE LP

Accession: 0001104659-26-065738

Filed: 2026-05-22

Period: 2026-05-20

CIK: 0001070423

SIC: 4610 (PIPE LINES (NO NATURAL GAS))

Item: Submission of Matters to a Vote of Security Holders

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PLAINS ALL AMERICAN PIPELINE LP

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2026-05-20

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PLAINS

ALL AMERICAN PIPELINE LP

UNITED STATES

SECURITIES AND

EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (Date of earliest event

reported) – May 20, 2026

Plains All American Pipeline,

L.P.

(Exact name of registrant as specified in its

charter)

Delaware

1-14569

76-0582150

(State

or other jurisdiction of

incorporation)

(Commission

File Number)

(IRS

Employer

Identification No.)

333

Clay Street, Suite 1600,

Houston, Texas

77002

(Address of principal executive offices) (Zip

Code)

713-646-4100

(Registrant’s telephone number, including area code)

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K

filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written

communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting

material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement

communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement

communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which

registered

Common

Units

PAA

Nasdaq

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule

12b-2 of the Securities Exchange Act of 1934.

Emerging growth company

an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying

with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 5.07 Submission of Matters to a Vote of Security Holders.

The 2026 annual meeting of common unitholders

and Series A Convertible Preferred unitholders (collectively, the “Unitholders”) of Plains All American Pipeline, L.P.

(“PAA” or the “Partnership”) was held on May 20, 2026. At the annual meeting, the Unitholders (other than

Plains AAP, L.P.) considered and voted on how to instruct PAA to vote the Class C shares of Plains GP Holdings, L.P. (“PAGP”)

that PAA owns at PAGP’s annual meeting with respect to the following matters, each of which is described in greater detail in PAA’s

Proxy Statement dated April 10, 2026 (the “Proxy Statement”): (i) the election of four Class I directors to

serve on the board of directors of PAA GP Holdings LLC until the 2029 annual meeting; (ii) 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; and (iii) the approval, on a non-binding advisory basis, of our 2025 named executive officer compensation.

Out of the 530,943,161 common units and Series A

Preferred units entitled to vote on Items 1, 2 and 3, approximately 83.2%, or 441,976,013 units, were represented in person or by proxy

at the PAA annual meeting. The voting results for each matter presented at the PAA annual meeting were as follows:

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

Willie Chiang

305,596,109

6,476,382

97.9%

129,903,522

Ellen DeSanctis

306,878,470

5,194,021

98.3%

129,903,522

Alexandra Pruner

304,958,788

7,113,703

97.7%

129,903,522

Larry Ziemba

306,095,853

5,976,638

98.1%

129,903,522

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-

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

*With respect to Items 1, 2 and 3, PAA Unitholders (other than Plains

AAP, L.P.) voted on a “pass-through” basis by instructing PAA how to vote the PAGP Class C shares that it owns on Items

1, 2 and 3 at the PAGP annual meeting.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf

by the undersigned hereunto duly authorized.

Date:

May 22, 2026

PLAINS

ALL AMERICAN PIPELINE, L.P.

By:

PAA GP LLC, its general partner

By:

Plains AAP, L.P., its sole member

By:

Plains All American GP LLC, its general partner

By:

/s/ Richard McGee

Name: Richard McGee

Title: Executive Vice President, General Counsel & Secretary

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