![Mark McCollum](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Mark McCollum
Director/Board Member at
SEADRILL LIMITED
Net worth: 1 M $ as of 30/09/2026
Profile
Mr. Mark A. McCollum, CPA, is an Independent Director at ONEOK, Inc., an Independent Director at Seadrill Ltd., an Independent Director at Westlake Corp., a Chief Financial Officer & Executive Vice President at Halliburton Group Canada, Inc., a Member at Financial Executives International, a Member at Institute of Management Accountants, Inc., a Member at Texas Society of Certified Public Accountants, a Member at The American Institute of Certified Public Accountants, a Partner at Mccollum Capital LLC and a President at Petris Technology, Inc. He is on the Board of Directors at ONEOK, Inc., Seadrill Ltd., Westlake Corp., Baylor St. Luke's Medical Center, Marathon Oil Co. LLC, Momentive Performance Materials, Inc., Baylor University, Baylor College of Medicine, The Center Foundation and Yellowstone Academy.
Mr. McCollum was previously employed as an Independent Director by ONEOK, Inc. (Old), an Independent Director by Marathon Oil Corp., a President, Chief Executive Officer & Director by Weatherford International plc, a Chief Financial & Integration Officer, EVP by Halliburton Co., a Chief Accounting Officer & Senior Vice President by Halliburton Energy Services, Inc., an Independent Director by Archrock, Inc., a Chief Financial Officer & Senior Vice President by Tenneco, Inc., an Audit Partner-Energy Division by Arthur Andersen LLP, and a Chairman by Star of Hope Mission.
He also served on the board at UCO Gp LLC, KBR, Inc., Exterran Partners LP, Butler Manufacturing Co., Seadrill Ltd. /Old/ and Universal Compression Partners LP.
He received his undergraduate degree from Baylor University.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
WESTLAKE CORPORATION 0.01% | 14/08/2026 | 11,824 ( 0.01% ) | 736 753 $ | 30/09/2026 |
SEADRILL LIMITED 0.01% | 03/06/2026 | 7,269 ( 0.01% ) | 324 706 $ | 30/09/2026 |
0% | 20/05/2026 | 2,572 ( 0% ) | 219 314 $ | 30/09/2026 |
Mark McCollum active positions
| Companies | Position | Start |
|---|---|---|
| WESTLAKE CORPORATION | Director/Board Member | 24/05/2018 |
| SEADRILL LIMITED | Director/Board Member | 22/02/2022 |
Momentive Performance Materials, Inc.
 Momentive Performance Materials, Inc. Chemicals: SpecialtyProcess Industries Develops and manufactures silicones and solutions | Director/Board Member | - |
Marathon Oil Co. LLC
 Marathon Oil Co. LLC Integrated OilEnergy Minerals Explores and transports, markets crude oil & natural gas | Director/Board Member | - |
Mccollum Capital LLC | Corporate Officer/Principal | - |
Baylor St. Luke's Medical Center
 Baylor St. Luke's Medical Center Miscellaneous Commercial ServicesCommercial Services Operates as non-profit healthcare center | Director/Board Member | - |
Yellowstone Academy
 Yellowstone Academy Other Consumer ServicesConsumer Services The private company is based in Houston, TX. It is paired with Yellowstone College Prep, a tuition-free public charter upper school for grades 6-12. Together, they educate over 600 primarily Black students from underserved communities, focusing on a Christian moral foundation, small class sizes, and comprehensive support including transportation and meals. The upper school is an early college high school offering up to 60 dual-enrollment college credits, preparing students for college and career success. While legally and financially separate, both schools share unified leadership, mission, and equal opportunity policies. Yellowstone Academy, part of Yellowstone Schools founded in 2001 in Houston’s historic Third Ward, operates as a private Christian lower school serving pre-K through 5th grade. | Director/Board Member | - |
Petris Technology, Inc.
 Petris Technology, Inc. Packaged SoftwareTechnology Services Develops and markets integrated data management analytics and business intelligence software for oil and gas companies | President | - |
Baylor University
 Baylor University Other Consumer ServicesConsumer Services Functions as a College/University | Director/Board Member | - |
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Former positions of Mark McCollum
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Education of Mark McCollum
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
76
1st degree connections
31
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 31 |
|---|---|
Butler Manufacturing Co.
 Butler Manufacturing Co. Building ProductsProducer Manufacturing Produces and markets building systems and components for nonresidential structures | Producer Manufacturing |
Halliburton Co.
 Halliburton Co. Oilfield Services/EquipmentIndustrial Services Provides products and services to the energy industry for exploring, developing & producing oil and natural gas | Industrial Services |
ONEOK, Inc.
 ONEOK, Inc. Oil & Gas PipelinesIndustrial Services Engages in gathering, processing, sale, transportation and storage of natural gas | Industrial Services |
Marathon Oil Corp.
 Marathon Oil Corp. Integrated OilEnergy Minerals Explores and produces crude oil & natural gas | Energy Minerals |
Tenneco, Inc.
 Tenneco, Inc. Auto Parts: OEMProducer Manufacturing Manufactures and sells automotive emission control, ride control products and systems | Producer Manufacturing |
Westlake Corp.
 Westlake Corp. Chemicals: SpecialtyProcess Industries Manufactures and supplies essential materials and housing & infrastructure products | Process Industries |
Universal Compression Partners LP
 Universal Compression Partners LP Gas DistributorsUtilities Provides natural gas compression services | Utilities |
Exterran GP LLC
 Exterran GP LLC MiscellaneousMiscellaneous Operates as a non-classified establishment | Miscellaneous |
Archrock, Inc.
 Archrock, Inc. Oilfield Services/EquipmentIndustrial Services Manufactures equipment for oil and natural gas production, processing and transportation | Industrial Services |
Marathon Oil Co. LLC
Marathon Oil Co. LLC Integrated OilEnergy Minerals Explores and transports, markets crude oil & natural gas | Energy Minerals |
Halliburton Energy Services, Inc.
 Halliburton Energy Services, Inc. Electric UtilitiesUtilities Provides energy services | Utilities |
KBR, Inc.
 KBR, Inc. Information Technology ServicesTechnology Services Provides technology, engineering and logistics support solutions to governments & companies | Technology Services |
Arthur Andersen LLP
 Arthur Andersen LLP Miscellaneous Commercial ServicesCommercial Services Provides accounting services | Commercial Services |
The American Institute of Certified Public Accountants
 The American Institute of Certified Public Accountants Miscellaneous Commercial ServicesCommercial Services Association of accountants | Commercial Services |
Baylor University
Baylor University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Halliburton Group Canada, Inc.
 Halliburton Group Canada, Inc. Oil & Gas ProductionEnergy Minerals Provides products and services to the oil and gas industry | Energy Minerals |
Financial Executives International
 Financial Executives International Miscellaneous Commercial ServicesCommercial Services Operates as a association for treasurers, controllers, tax executives and financial services | Commercial Services |
Baylor College of Medicine
 Baylor College of Medicine Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Seadrill Ltd. /Old/
 Seadrill Ltd. /Old/ Contract DrillingIndustrial Services Provides offshore deep water drilling services | Industrial Services |
Petris Technology, Inc.
Petris Technology, Inc. Packaged SoftwareTechnology Services Develops and markets integrated data management analytics and business intelligence software for oil and gas companies | Technology Services |
Momentive Performance Materials, Inc.
Momentive Performance Materials, Inc. Chemicals: SpecialtyProcess Industries Develops and manufactures silicones and solutions | Process Industries |
Texas Society of Certified Public Accountants
 Texas Society of Certified Public Accountants Texas Society of Certified Public Accountants is based in Dallas, TX and has subsidiaries in the United States. The Texas Society of Certified Public Accountants (TXCPA) is an organization that aims to increase the number of individuals becoming licensed CPAs by expanding their outreach. The company offers opportunities for exhibitors and sponsors to participate in their CPE conferences. | |
Institute of Management Accountants, Inc.
 Institute of Management Accountants, Inc. Miscellaneous Commercial ServicesCommercial Services Operates as a association of accountants and financial professionals | Commercial Services |
Archrock Partners LP
 Archrock Partners LP Oilfield Services/EquipmentIndustrial Services Provides natural gas compression services | Industrial Services |
Star of Hope Mission
 Star of Hope Mission Services to the Health IndustryHealth Services Operates as a christ-centered community supporting homelessness men's, women's and children's | Health Services |
The Center Foundation | |
Yellowstone Academy
Yellowstone Academy Other Consumer ServicesConsumer Services The private company is based in Houston, TX. It is paired with Yellowstone College Prep, a tuition-free public charter upper school for grades 6-12. Together, they educate over 600 primarily Black students from underserved communities, focusing on a Christian moral foundation, small class sizes, and comprehensive support including transportation and meals. The upper school is an early college high school offering up to 60 dual-enrollment college credits, preparing students for college and career success. While legally and financially separate, both schools share unified leadership, mission, and equal opportunity policies. Yellowstone Academy, part of Yellowstone Schools founded in 2001 in Houston’s historic Third Ward, operates as a private Christian lower school serving pre-K through 5th grade. | Consumer Services |
Weatherford International plc
 Weatherford International plc Oilfield Services/EquipmentIndustrial Services Provides well construction technologies, production and drilling services | Industrial Services |
Baylor St. Luke's Medical Center
Baylor St. Luke's Medical Center Miscellaneous Commercial ServicesCommercial Services Operates as non-profit healthcare center | Commercial Services |
Seadrill Ltd.
 Seadrill Ltd. Contract DrillingIndustrial Services Provides offshore drilling services | Industrial Services |
Mccollum Capital LLC |
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