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Corporate event for ONEOK Inc. stock

14 September 2026

Dear clients!
We would like to inform you that a corporate event regarding the shares of ONEOK Inc, ISIN: US6826801036, has been announced.

Details of the corporate event:

Parameter	Value
Event type	Conversion / Mandatory exchange (Exchange offers)
Mandatory indicator	Mandatory
Effective date	September 11, 2026.
Exchange ratio	1:1
New ISIN	US30609A1097

The event is conducted due to the company's internal reorganization (transition to a holding structure).

No action is required from holders (shareholders).

Should you have any additional questions, please contact us using the details below:

Almaty: +7 701 006 41 81
Astana: +7 701 006 41 80
WhatsApp: +7 707 357 31 70
sales@halykfinance.kz

Best regards,
JSC «Halyk Finance»

+7 727 339 43 77 +7 727 339 43 88

halykfinance@halykfinance.kz

The Company does not guarantee profit or the absence of losses when trading in securities. The Client is aware of the risks inherent in securities trading and has the financial ability to assume such risks and bear any losses incurred in this regard. The Company shall not be liable for any losses arising from investments made based on any recommendations, forecasts, reviews, or other information.

JSC «Halyk Finance». License for securities market activities No. 3.2.229/7, issued by the National Bank of the Republic of Kazakhstan on November 4, 2016.

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