Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Chandler Chris R. 2. Issuer Name and Ticker or Trading Symbol PLAINS ALL AMERICAN PIPELINE LP [PAA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP & COO (Last) (First) (Middle) 333 CLAY STREET, SUITE 1600 3. Date of Earliest Transaction (Month/Day/Year) 08/13/2026 (Street) HOUSTON, TX 77002 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Units 08/14/2026 M 500,000 A $ 0 993,904 D Common Units 08/14/2026 M 140,691 A $ 0 1,134,595 D Common Units 08/14/2026 F 252,112 D $23.45 882,483 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Phantom Units(1)

(2)

08/14/2026

M

500,000

08/14/2026

08/14/2026

Common Units

500,000

$ 0

0

D

Phantom Units(1)

(2)

08/14/2026

M

140,691

08/14/2026

08/14/2026

Common Units

140,691

$ 0

0

D

Phantom Units(1)

(2)

08/13/2026

A

113,600

(3)(4)(5)

(3)(4)(5)

Common Units

113,600

$ 0

113,600

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Chandler Chris R. 333 CLAY STREET SUITE 1600 HOUSTON, TX 77002			EVP & COO

Signatures

/s/ Ann F. Gullion, as attorney-in-fact for Reporting Person		08/17/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Phantom Units granted under Long-Term Incentive Plan (includes distribution equivalent rights payable in cash).
(2)	One common unit is deliverable, upon vesting, for each Phantom Unit that vests.
(3)	These phantom units will vest as follows: (a) Tranche 1, consisting of 56,800 phantom units, will vest on the August 2029 distribution date assuming continued service through such date; (b) Tranche 2, consisting of 28,400 phantom units (assuming 100% payout at target), will potentially vest on the August 2029 distribution date at a scaled payout range of between 0% to 200% based on PAA's total shareholder return (TSR) over the three-year period ending June 30, 2029 compared to the TSR of a selected peer group (payout based on numeric rank with 100% earned at median and interpolation between ranks, and with payout being subject to reduction by up to 25 basis points, but not below 100%, if actual TSR is negative); and
(4)	(c) Tranche 3, consisting of 28,400 phantom units (assuming 100% payout at target), will potentially vest on the Aug. 2029 distribution date at a scaled payout range of between 0% and 200% based on PAA achieving cumul. distributable cash flow (DCF) per common unit equivalent (CUE) of $9.10 over the 3-year period ending 6/30/29 (with payout equaling 100% at cumul. DCF/CUE over such period of $9.10 and being equal to 0% for cumul. DCF/CUE over such period of $8.19 or lower and 200% for cumul. DCF/CUE over such period of $10.01 or higher), with interpolation btw. such points, and with payout being subject to reduction by 25 basis pts. if PAA's leverage ratio (long term debt to adj. EBITDA as calculated pursuant to PAA's sr. unsecured revolving credit facility) as of 6/30/29 is greater than the leverage ratio that equals the upper end of our then applicable non-rating agency target leverage ratio range.
(5)	DERs associated with Tranche 1 will accrue for the first year and be paid in cash in a lump sum on the August 2029 distribution date; beginning in November 2027, DERs associated with Tranche 1 will be paid quarterly until the phantom units vest or terminate. DERs associated with Tranches 2 and 3 will accrue during the three-year vesting period and be paid in cash in a lump sum on the August 2029 distribution date with respect to each phantom unit that vests, if any, on such date. Any Tranche 2 or Tranche 3 phantom units that are determined to not have vested as of the August 2029 distribution date shall expire as of such date.

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