Mark Helderman

Director/Board Member at ONEOK, INC.

Net worth: 3 M $ as of 2026-05-30

68 year

65 connections

Industrial Services

Finance

Consumer Services

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%	2026-05-19	38,704 ( 0.01% )	3 M $	2026-05-30

Mark Helderman active positions

Companies	Position	Start
ONEOK, INC.	Director/Board Member	2019-02-18

All active positions of Mark Helderman

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	2018-12-31

See the detail of Mark Helderman's experience

Training of Mark Helderman

Experiences
Positions held

Active

Inactive

Listed companies

Private companies

See the detail of Mark Helderman's experience

Connections

1st degree connections

1st degree companies

Male

Female

Members of the board

Executives

See the personal network

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