![Mark Helderman](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 Helderman
Director/Board Member at
ONEOK, INC.
Net worth: 4 M $ as of 31/07/2026
Profile
Mark William Helderman is an Independent Director at ONEOK, Inc. since 2019.
Mr. Helderman was Managing Director & Portfolio Manager at Sasco Capital, Inc. from 1997 to 2019.
Mr. Helderman completed undergraduate studies at the University of Dayton in 1981.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
ONEOK, INC. 0.01% | 20/05/2026 | 38,704 ( 0.01% ) | 4 M $ | 31/07/2026 |
Mark Helderman active positions
| Companies | Position | Start |
|---|---|---|
| ONEOK, INC. | Director/Board Member | 19/02/2019 |
Former positions of Mark Helderman
| Companies | Position | End |
|---|---|---|
Sasco Capital, Inc.
 Sasco Capital, Inc. Investment ManagersFinance Sasco Capital employs a time-tested, contrarian approach to value investing in the Small, Smid and Mid-Cap market segments. The firm utilizes fundamental, bottom-up security analysis based on a proprietary screening process, individual company research, and meetings with senior management. They invest in out-of-favor, underperforming companies with restructuring and transformational potential. The investment strategy has a long-term investment horizon and low turnover. | Portfolio Manager-Equities | 01/01/2019 |
Training of Mark Helderman
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
66
1st degree connections
3
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 3 |
|---|---|
ONEOK, Inc.
 ONEOK, Inc. Oil & Gas PipelinesIndustrial Services Engages in gathering, processing, sale, transportation and storage of natural gas | Industrial Services |
Sasco Capital, Inc.
Sasco Capital, Inc. Investment ManagersFinance Sasco Capital employs a time-tested, contrarian approach to value investing in the Small, Smid and Mid-Cap market segments. The firm utilizes fundamental, bottom-up security analysis based on a proprietary screening process, individual company research, and meetings with senior management. They invest in out-of-favor, underperforming companies with restructuring and transformational potential. The investment strategy has a long-term investment horizon and low turnover. | Finance |
University of Dayton
 University of Dayton Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
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