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Helderman Mark W similar filings
- 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
- 19 Mar 20 ONEOK / MARK W HELDERMAN ownership change
- 17 Dec 19 ONEOK / MARK W HELDERMAN ownership change
- 24 May 19 ONEOK / MARK W HELDERMAN ownership change
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