PAA: Open-market purchases of Common Units recorded

PAA: Notice of proposed open-market purchases of Common Units by Morgan Stanley Smith Barney LLC.

Rhea-AI Filing Summary

PAA: Notice of proposed open-market purchases of Common Units by Morgan Stanley Smith Barney LLC. The filing lists multiple cash open-market purchase trades dated in 2018. Examples include purchases of 323, 103, and 845 Common Units on 03/13/2018, 03/14/2018, and 11/12/2018 respectively. The record shows a data row with 51494.70 and a date of 06/29/2026.

Insights

Securities Compliance Analyst

Records multiple historical open-market cash purchases of Common Units by a broker-dealer.

The excerpt lists discrete open-market purchase transactions of Common Units dated across 2018 with trade counts per date. The entries are described as Cash purchases and identify the executing broker-dealer as Morgan Stanley Smith Barney LLC.

These lines appear to document acquisition activity; timing and cash‑flow treatment beyond the trade labels are not expanded in the excerpt. Subsequent filings or full transaction tables would clarify totals and the significance of the 51494.70 figure shown.

Key Figures

Trade example: 323 shares Trade example: 103 shares Trade example: 845 shares +2 more

5 metrics

Trade example 323 shares Open-market purchase on 03/13/2018

Trade example 103 shares Open-market purchase on 03/14/2018

Trade example 845 shares Open-market purchase on 11/12/2018

Data field shown 51494.70 Numeric field on same row as 06/29/2026 and NASDAQ

Trade example 287 shares Open-market purchase on 06/04/2018

Key Terms

Open Market Purchase, Common Units, Cash

3 terms

Open Market Purchase market

"Entries labeled "Open Market Purchase" with dates and share counts"

An open market purchase is when a company buys its own shares on public stock exchanges the same way any investor would, rather than through a private deal. Investors care because these purchases reduce the number of shares available, can boost earnings per share and share price, signal that management thinks the stock is undervalued, and use company cash that might otherwise go to reinvestment or dividends — like a business quietly buying back its own tickets at the box office.

Common Units financial

"Rows described as "Common Units" for each trade entry"

Common units are the basic ownership stakes in a company, limited partnership, or trust that function like common stock: they give holders a claim on profits and often voting rights. Think of them as the ordinary seats at a table—the most directly affected by the business’s success or failure, so they typically offer higher upside but carry greater risk than preferred claims or creditors, which matters to investors evaluating potential return and safety.

Cash financial

"Each trade row ends with the word "Cash" indicating settlement method"

FAQ

What does the PAA Form 144 excerpt show about transactions?

It lists multiple open-market cash purchases of Common Units dated in 2018. The excerpt shows trade counts per date, such as 323 on 03/13/2018 and 845 on 11/12/2018, executed by Morgan Stanley Smith Barney LLC.

Who is listed as the executing broker-dealer in the excerpt for PAA?

The excerpt names Morgan Stanley Smith Barney LLC at 1 New York Plaza as the executing broker-dealer. The entries are labeled as Open Market purchases settled in Cash.

Does the excerpt state an aggregate number of shares sold or registered?

No aggregate offering or resale total is stated in the provided excerpt. It shows individual trade counts by date (for example, 103, 255, 287) rather than a single aggregate amount.

What is the significance of the 06/29/2026 date in the excerpt?

The row containing 06/29/2026 appears alongside numeric fields including 51494.70 and an exchange label NASDAQ. The excerpt does not explain that date’s role; its context is not expanded in the visible text.

Are proceeds or uses of proceeds described in this excerpt for PAA?

The excerpt labels trades as Cash open-market purchases but does not disclose who received proceeds or any use-of-proceeds language. Cash-flow treatment beyond the trade label is not provided in the excerpt.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/29/2026 - 04:08 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001547334
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	PLAINS ALL AMERICAN PIPELINE, L.P.
SEC File Number	001-14569
Address of Issuer	333 Clay Street Suite 1600 Houston TEXAS 77002
Phone	(713) 646-4100
Name of Person for Whose Account the Securities are To Be Sold	ZIEMBA FAMILY TRUST
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Units	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	2346	51494.70	705531683	06/29/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Units	03/13/2018	Open Market Purchase	Open Market			323	03/13/2018	Cash
Common Units	03/14/2018	Open Market Purchase	Open Market			32	03/14/2018	Cash
Common Units	03/14/2018	Open Market Purchase	Open Market			103	03/14/2018	Cash
Common Units	03/15/2018	Open Market Purchase	Open Market			255	03/15/2018	Cash
Common Units	04/25/2018	Open Market Purchase	Open Market			75	04/25/2018	Cash
Common	05/09/2018	Open Market Purchase	Open Market			50	05/09/2018	Cash
Common Units	05/11/2018	Open Market Purchase	Open Market			23	05/11/2018	Cash
Common Units	06/04/2018	Open Market Purchase	Open Market			287	06/04/2018	Cash
Common Units	07/12/2018	Open Market Purchase	Open Market			59	07/12/2018	Cash
Common Units	07/13/2018	Open Market Purchase	Open Market			294	07/13/2018	Cash
Common Units	11/12/2018	Open Market Purchase	Open Market			845	11/12/2018	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	06/29/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Lawrence Michael Ziemba/as Trustee
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)