CORPORATE OVERVIEW

ONEOK, Inc. (pronounced ONE-OAK) (NYSE: OKE) is a leading midstream service provider and owner of one of the nation's premier natural gas liquids (NGL) systems, connecting NGL supply in the Mid-Continent, Permian and Rocky Mountain regions with key market centers and an extensive network of natural gas gathering, processing, storage and transportation assets.

ONEOK is a FORTUNE 500 company and is included in the S&P 500. Click here for information about ONEOK.

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ONEOK Corporate Headquarters

100 West Fifth Street Tulsa, OK 74103-4298
Post Office Box 871 Tulsa, OK 74102-0871

ABOUT THIS REPORT

This report details ONEOK’s performance from January 2017 through December 2017, unless otherwise noted.
This report follows the Global Reporting Initiative’s (GRI) Standards sustainability reporting guidelines. Click here for an interactive guide that helps readers locate specific GRI framework data within this report.

For more information, and to offer comments and suggestions about this report, please contact:

Corporate Communications

Megan Washbourne, director – communications, by phone at 918-588-7572 or by email at megan.washbourne@oneok.com.

Brad Borror, manager – communications, by phone at 918-588-7582 or by email at brad.borror@oneok.com.

Stephanie Higgins, supervisor – communications, by phone at 918-591-5026 or by email at stephanie.higgins@oneok.com.

Investor Relations

Andrew Ziola, vice president – investor relations and corporate affairs, by phone at 918-588-7683 or by email at andrew.ziola@oneok.com.

Megan Patterson, manager – investor relations, by phone at 918-561-5325 or by email at megan.patterson@oneok.com.