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Helderman Mark W similar filings
- 24 May 24 ONEOK / MARK W HELDERMAN ownership change
- 26 May 23 ONEOK / MARK W HELDERMAN ownership change
- 27 May 22 ONEOK / MARK W HELDERMAN ownership change
- 4 Mar 22 ONEOK / MARK W HELDERMAN ownership change
- 28 May 21 ONEOK / MARK W HELDERMAN ownership change
- 21 May 20 ONEOK / MARK W HELDERMAN ownership change
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