
Limited Assurance from External Third Party
ONEOK’s Corporate Sustainability Report is informed by a collaboration of corporate business segments with final review and approval by ONEOK executive management and the ONEOK board of directors. We engaged an external third party to perform limited assurance attestation procedures for certain emissions and safety and health metrics disclosed in ONEOK’s Performance Data. Metrics receiving third-party limited assurance are noted in the Performance Data.

Reporting archive
- ONEOK 2025-2026 Sustainability Report
- ONEOK 2024-2025 Sustainability Report
- ONEOK 2023-2024 Sustainability Report
- ONEOK 2022-2023 Sustainability Report
- ONEOK 2021-2022 Sustainability Report
- ONEOK 2020-2021 Sustainability Report
- ONEOK 2019-2020 Sustainability Report
- ONEOK 2018-2019 Sustainability Report
- ONEOK 2017-2018 Sustainability Report
- ONEOK 2016-2017 Sustainability Report
- ONEOK 2015-2016 Sustainability Report
- ONEOK 2014-2015 Sustainability Report
Feature stories
Energy makes a difference
As a leading midstream operator, ONEOK provides integrated gathering, processing, fractionation, transportation, storage and marine export services across an extensive pipeline network, helping meet global energy demand with safe, reliable and responsible solutions that make a difference in the lives of people in the U.S. and around the world.








