DIMENSIONAL FUND ADVISORS LP - ION GEOPHYSICAL CORP ownership

ION GEOPHYSICAL CORP's ticker is IO and the CUSIP is 462044207. A total of 64 filers reported holding ION GEOPHYSICAL CORP in Q1 2016. The put-call ratio across all filers is - and the average weighting 0.0%.

Quarter-by-quarter ownership
DIMENSIONAL FUND ADVISORS LP ownership history of ION GEOPHYSICAL CORP
ValueSharesWeighting
Q2 2021$26,000
-3.7%
12,5870.0%0.00%
Q1 2021$27,000
-89.2%
12,587
-92.5%
0.00%
Q3 2020$251,000
-70.3%
167,658
-53.6%
0.00%
Q2 2020$846,000
+32.8%
361,373
-28.0%
0.00%
Q1 2020$637,000
-85.9%
501,879
-3.7%
0.00%
-100.0%
Q4 2019$4,525,000
-6.7%
521,271
-1.9%
0.00%0.0%
Q3 2019$4,848,000
+14.0%
531,629
+0.6%
0.00%0.0%
Q2 2019$4,253,000
-37.2%
528,376
+12.6%
0.00%
-33.3%
Q1 2019$6,777,000
+199.1%
469,325
+7.3%
0.00%
+200.0%
Q4 2018$2,266,000
-66.1%
437,336
+1.9%
0.00%
-66.7%
Q3 2018$6,677,000
-35.6%
429,367
+0.7%
0.00%
-25.0%
Q2 2018$10,366,000
+2.8%
426,584
+14.6%
0.00%0.0%
Q1 2018$10,086,000
+109.9%
372,163
+53.0%
0.00%
+100.0%
Q4 2017$4,805,000
+107.6%
243,3070.0%0.00%
+100.0%
Q3 2017$2,314,000
+100.5%
243,307
-8.3%
0.00%0.0%
Q2 2017$1,154,000
-10.3%
265,3780.0%0.00%0.0%
Q1 2017$1,287,000
-19.8%
265,378
-0.7%
0.00%0.0%
Q4 2016$1,604,000
-11.9%
267,254
+0.6%
0.00%0.0%
Q3 2016$1,820,000
+8.5%
265,746
-1.3%
0.00%0.0%
Q2 2016$1,678,000
-23.7%
269,317
-1.0%
0.00%0.0%
Q1 2016$2,198,000272,0910.00%
Other shareholders
ION GEOPHYSICAL CORP shareholders Q1 2016
NameSharesValueWeighting ↓
GSA CAPITAL PARTNERS LLP 54,182$132,0000.02%
BRIDGEWAY CAPITAL MANAGEMENT, LLC 77,400$188,0000.00%
Renaissance Technologies 1,004,267$2,440,0000.00%
SeaCrest Wealth Management, LLC 10,000$24,0000.00%
FARMERS & MERCHANTS INVESTMENTS INC 20,763$50,0000.00%
Neuberger Berman Group LLC 284,018$690,0000.00%
ACADIAN ASSET MANAGEMENT LLC 79,526$193,0000.00%
SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 17,876$43,0000.00%
DEUTSCHE BANK AG\ 300,000$729,0000.00%
MORGAN STANLEY 747$2,0000.00%
View complete list of ION GEOPHYSICAL CORP shareholders