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Feb 11, 2021 09:45AM Form SC 13G/A ION GEOPHYSICAL CORP Filed by: RENAISSANCE TECHNOLOGIES LLC
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Jan 31, 2019 02:59PM Form SC 13G/A ION GEOPHYSICAL CORP Filed by: Invesco Ltd.
Jan 31, 2019 10:37AM
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Oct 26, 2018 05:28PM
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Feb 12, 2018 03:23PM Form SC 13G/A ION GEOPHYSICAL CORP Filed by: Invesco Ltd.
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Feb 3, 2015 03:34PM Form SC 13G/A ION GEOPHYSICAL CORP Filed by: Invesco Ltd.
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