PAA Plains All American Pipeline

FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES                                                                                   
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940                       

1. Name and Address of Reporting Person * SHACKOULS BOBBY S	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) __X__ Director                    _____ 10% Owner _____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle) 333 CLAY STREET, SUITE 1600	3. Date of Earliest Transaction (MM/DD/YYYY) 8/13/2021
(Street) HOUSTON, TX 77002 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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	8/13/2021		M		3750	A	$0	21266	D (1)(2)
Common Units								13767	I (2)	By Spouse

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		7. Title and Amount of Securities Underlying Derivative Security (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 (3)	(4)	8/13/2021		M			3750	(5)	(6)	Common Units	3750	$0	0	D

Explanation of Responses:
(1)	Includes 7,500 units held jointly with Reporting Person's spouse.
(2)	In February 2020, the reporting person and his spouse received 2,784 and 2,785 common units of PAA, respectively, in a distribution from their respective grantor retained annuity trusts in accordance with the terms of the GRATs. The distribution of units from the GRATs resulted in a decrease in the number of units beneficially owned indirectly through the GRATs, and a corresponding increase in the number of units beneficially owned directly and indirectly through spouse. The distribution of units from the GRATs constituted a change in form of beneficial ownership, which is exempt under Rule 16a-13 of the Exchange Act.
(3)	Phantom Units granted under Long-Term Incentive Plan (includes distribution equivalent rights payable in cash).
(4)	One common unit is deliverable, upon vesting, for each Phantom Unit that vests.
(5)	Phantom Units vest annually on August distribution date.
(6)	Upon termination of service as director, other than because of death, disability or retirement.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SHACKOULS BOBBY S 333 CLAY STREET, SUITE 1600 HOUSTON, TX 77002	X

Signatures
/s/ Bobby S. Shackouls		8/17/2021
**Signature of Reporting Person		Date