Russ Montgomery was named Chief Accounting Officer of Plains Gp Holdings Lp, effective September 1, 2026. As of November 6, 2026, Plains Gp Holdings Lp has reported 3 leadership change filings to the SEC under Item 5.02 of Form 8-K, from May 13, 2026 to September 29, 2026, naming 2 appointments and 1 departure (Form 8-K, June 2, 2026).
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Key facts
- · In / out: Out · Person: Chris Chandler · 8-K, 2026-09-29
- · In / out: In · Person: Russ Montgomery · Role: Chief Accounting Officer · Effective: 2026-09-01 · 8-K, 2026-06-02
- · In / out: In · Person: Cynthia B. Taylor · Role: Director · 8-K, 2026-05-13
Plains Gp Holdings Lp reported changes in 3 filings among its directors and officers to the SEC on Form 8-K, Item 5.02, from 2026-05-13 to 2026-09-29. They name 3 people, with 2 appointments and 1 departure. Every row below is cited to the filing it comes from, and this page adds each new change as Plains Gp Holdings Lp files it.
Also on the record for Plains Gp Holdings Lp
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| February 17, 2026 | Stake report, Schedule 13G, by Energy Income Partners, LLC | 4.47% of the class | 5%+ stakes | Source |
| January 28, 2026 | Stake report, Schedule 13G/A, by Massachusetts Financial Services Company | 4.8% of the class | 5%+ stakes | Source |
| August 4, 2025 | Stake report, Schedule 13G, by Massachusetts Financial Services Company | 5.1% of the class | 5%+ stakes | Source |
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More on Plains Gp Holdings Lp and the records around it.
Plains Gp Holdings Lp elsewhere on the record
Companies that share a holder
- Energy Income Partners, LLC also filed stake reports on 2 other companies: Clearway Energy, Inc. (Aug 2026)
- Massachusetts Financial Services Company also filed stake reports on 26 other companies: ASHLAND INC. (Aug 2026), BLACKSTONE DIGITAL INFRASTRUCTURE TRUST INC (Aug 2026), PG&E CORP (Aug 2026)
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Timeline
| Filed | In / out | Person | Role | Effective | Source |
|---|---|---|---|---|---|
| 2026-09-29 | Out | 8-K, 2026-09-29 | |||
| 2026-06-02 | In | Chief Accounting Officer | 2026-09-01 | 8-K, 2026-06-02 | |
| 2026-05-13 | In | Director | 8-K, 2026-05-13 |
Who leads Plains Gp Holdings Lp, as last reported?
For each role that changed in the filings below, the most recent change reported. A role that did not change in these filings is not listed.
- Chief Accounting Officer: Russ Montgomery, appointed, effective 2026-09-01 (filed 2026-06-02).
- Director: Cynthia B. Taylor, appointed (filed 2026-05-13).
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Departing: Chris Chandler
Mr. Chandler is resigning to pursue other interests and not due to any disagreement relating to the company's operations, policies or practices.
- On September 29, 2026, Plains All American Pipeline, L.P. ("PAA") and Plains GP Holdings, L.P. ("PAGP" or the "Registrant") announced the appointment, effective October 2, 2026, of Dean Liollio as Executive Vice President and Chief Operating Officer ("EVP and COO") of Plains All American GP LLC, the general partner of PAA, and PAA GP Holdings LLC, the general partner of PAGP.
- Chris Chandler, who previously served as EVP and COO of PAA and PAGP, provided notice on September 25, 2026 that he will resign from the company effective October 2, 2026.
- Mr. Liollio, age 67, served as Senior Vice President, Special Projects, of Plains from June 2024 until his appointment as EVP and COO in October 2026.
- He previously served as President of Plains Midstream Canada from 2020 until 2024, as President of PAA Natural Gas Storage from 2008 until 2020 and as President of Plains Gas Solutions from 2016 until 2020.
- Prior to joining Plains in 2008, Mr. Liollio held a number of executive roles including serving as President, Chief Executive Officer and Director of EnergySouth, Inc. and as President and Chief Operating Officer of Centerpoint's natural gas distribution operations across a five-state area including Houston.
- Mr. Liollio holds a Bachelor of Science degree in Industrial Engineering from Texas A&M University.
- As EVP and COO, Mr. Liollio will receive an annual base salary of $625,000.
Appointed: Russ Montgomery, Chief Accounting Officer, effective 2026-09-01
On June 1, 2026, Plains All American Pipeline, L.P. ("PAA") and Plains GP Holdings, L.P. ("PAGP" or the "Registrant") 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.
Appointed: Cynthia B. Taylor, Director
On May 11, 2026, the board of directors (the "Board") of Plains All American Pipeline, L.P.'s (the "Registrant") general partner, PAA GP Holdings LLC (the "Company"), appointed Cynthia B. Taylor as an independent member of the Board serving in Class III.
- Ms. Taylor will also serve as a member of the Compensation Committee and the Health, Safety, Environmental and Sustainability Committee.
- The Board has responsibility for managing the business and affairs of the Registrant and of Plains GP Holdings, L.P. ("PAGP").
- Ms. Taylor has over 30 years of energy industry experience, most recently serving as Chief Executive Officer and President of Oil States International, Inc. and as a member of the Oil States Board of Directors.
- She held these positions from May 2007 until her retirement from Oil States in May 2026.
- From May 2006 until May 2007, Ms. Taylor served as President and Chief Operating Officer of Oil States and served as Senior Vice President - Chief Financial Officer and Treasurer prior to that.
- From August 1999 to May 2000, Ms. Taylor was the Chief Financial Officer of L.E. Simmons & Associates, Incorporated.
- Ms. Taylor served as the Vice President - Controller of Cliffs Drilling Company from July 1992 to August 1999 and held various management positions with Ernst & Young LLP, a public accounting firm, from January 1984 to July 1992.
- Ms. Taylor was a director of the Federal Reserve Bank of Dallas from January 2020 through December 31, 2025 and served as a director of the Federal Reserve Bank's Houston Branch from 2018 to 2019.
- She has also served as a director of AT&T Inc. since 2013 and serves as chair of the AT&T audit committee.
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Where this comes from
A public company must file a current report on Form 8-K with the SEC within four business days when a director leaves or is elected, or when its chief executive, chief financial, chief accounting or chief operating officer, or another named executive, departs or is appointed. That disclosure goes under Item 5.02 of the report.
Every change on this page is taken from one of those filings and quoted in the company's own words, with a link to the filing, so it can be checked at the source. Where a filing names the person, the role and the date a change takes effect, they are shown beside the quote. Where it does not, the quote stands on its own. A filing states what changed; it rarely states why, and neither does this page.