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Ownership
SC 13D/A
GEOSPACE TECHNOLOGIES CORP
15 Jul 20
SC 13D/A
GEOSPACE TECHNOLOGIES CORP
12 Dec 18
SC 13D/A
GEOSPACE TECHNOLOGIES CORP
15 May 18
SC 13D
GEOSPACE TECHNOLOGIES CORP
3 Apr 18
SC 13G/A
GEOSPACE TECHNOLOGIES CORP
15 Feb 18
SC 13G/A
GEOSPACE TECHNOLOGIES CORP
11 Jan 17
SC 13G/A
GEOSPACE TECHNOLOGIES CORP
25 Jan 16
SC 13G
GEOSPACE TECHNOLOGIES CORP
30 Nov 15