ONEOK Update on Mont Belvieu, Texas, Incident

Core Points - A fire occurred on October 6, 2025, in the heating system of ONEOK's MB-4 fractionator at the Mont Belvieu, Texas, fractionation complex [1] - The fire was quickly extinguished, and fractionation operations were promptly shut down [2] - ONEOK does not anticipate a material effect on its financial condition, results of operations, or cash flows due to the incident [2] Company Overview - ONEOK is a leading midstream operator providing essential energy products and services, including gathering, processing, fractionation, transportation, storage, and marine export services [3] - The company operates an extensive pipeline network of approximately 60,000 miles, transporting natural gas, natural gas liquids, refined products, and crude oil [3] - ONEOK is headquartered in Tulsa, Oklahoma, and is part of the S&P 500 [4]