Form 8-K

8-K — PLAINS ALL AMERICAN PIPELINE LP

Accession: 0001104659-26-069156

Filed: 2026-06-02

Period: 2026-06-01

CIK: 0001070423

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

Item: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

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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):

June 1, 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)

Registrant’s telephone number, including

area code: 713-646-4100

(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

The Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth

company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities

Exchange Act of 1934 (§240.12b-2 of this chapter).

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

5.02. Departure

of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers;

Compensatory Arrangements of Certain Officers.

On June 1, 2026, Plains All American Pipeline,

L.P. (“PAA” or the “Registrant”) and Plains GP Holdings, L.P. (“PAGP”) announced that effective September 1,

2026, Russ Montgomery will be promoted to the position of Vice President, Accounting and Chief Accounting Officer of Plains All American

GP LLC, the general partner of PAA, and PAA GP Holdings LLC, the general partner of PAGP. Chris Herbold, who previously served as Senior

Vice President, Finance and Chief Accounting Officer of PAA and PAGP, is retiring from the company on August 31, 2026.

Mr. Montgomery, age 50, has served as

Vice President, Controller of PAA since 2019. He previously served as Controller from 2010 to 2019,

Director of Operational Accounting from 2008 to 2010, Manager of Crude Oil Accounting from 2005 to 2008 and SEC and Financial

Reporting Senior Analyst from 2002 to 2005. Prior to joining PAA in September 2002, Mr. Montgomery spent four years

working for the accounting firm Arthur Andersen LLP.

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.

PLAINS ALL AMERICAN PIPELINE, L.P.

Date: June 2, 2026

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:

Plains GP Holdings, L.P., its sole member

By:

PAA GP Holdings LLC, its general partner

By:

/s/ Richard McGee

Name:

Richard McGee

Title:

Executive Vice President, General Counsel and Secretary

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