GROUP ONE TRADING, L.P. - ION GEOPHYSICAL CORP ownership

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ION GEOPHYSICAL CORP's ticker is IO and the CUSIP is 462044108. A total of 141 filers reported holding ION GEOPHYSICAL CORP in Q3 2013. The put-call ratio across all filers is 1.87 and the average weighting 0.1%.

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Quarter-by-quarter ownership
GROUP ONE TRADING, L.P. ownership history of ION GEOPHYSICAL CORP
ValueSharesWeighting
Q1 2015$3,000
-25.0%
1,512
+7.1%
0.00%–
Q4 2014$4,000
-96.8%
1,412
-95.3%
0.00%
-100.0%
Q1 2014$126,000
+320.0%
29,987
+230.0%
0.00%–
Q4 2013$30,000
-25.0%
9,087
+16.7%
0.00%
-100.0%
Q3 2013$40,000–7,787–0.00%–
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Other shareholders
ION GEOPHYSICAL CORP shareholders Q3 2013
NameSharesValueWeighting ↓
TCI Wealth Advisors, Inc. 333$3,0000.00%
View complete list of ION GEOPHYSICAL CORP shareholders