GEOSPACE TECHNOLOGIES CORP — 4/A Filings
20 4/A filings on record
This page lists all 4/A filings submitted to the SEC by GEOSPACE TECHNOLOGIES CORP (GEOS), sorted by most recent first. Each row links to the full filing on EdgarLookup. GEOSPACE TECHNOLOGIES CORP has filed 20 4/A documents with the SEC since 1997. To view all SEC filings by GEOSPACE TECHNOLOGIES CORP, see the full filings list.
All
10-K
10-K/A
10-K405
10-Q
10-Q/A
144
3
3/A
4
4/A
424B1
424B3
424B4
8-A12B
8-K
8-K/A
ARS
CORRESP
DEF 14A
DEFA14A
EFFECT
FWP
NT 10-Q
PRE 14A
S-1
S-1/A
S-3
S-3/A
S-8
S-8 POS
SC 13D
SC 13D/A
SC 13G
SC 13G/A
SCHEDULE 13G
SCHEDULE 13G/A
SD
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| 4/A | FORM 4/A | 0001437749-25-036981 | Dec 5, 2025 | Nov 20, 2025 |
| 4/A | FORM 4/A | 0001437749-24-004988 | Feb 21, 2024 | Feb 14, 2024 |
| 4/A | FORM 4/A SUBMISSION | 0001209191-23-008250 | Feb 10, 2023 | Feb 9, 2023 |
| 4/A | FORM 4/A SUBMISSION | 0001209191-19-058042 | Nov 26, 2019 | Nov 21, 2019 |
| 4/A | FORM 4/A SUBMISSION | 0001209191-18-050404 | Sep 11, 2018 | Sep 7, 2018 |
| 4/A | KATSUHIKO KOBAYASHI FORM 4/A FOR 12/29/08 FILING | 0001181431-09-000325 | Jan 5, 2009 | Dec 24, 2008 |
| 4/A | OYO CORP FORM 4/A FOR 12/29/08 FILING | 0001181431-09-000324 | Jan 5, 2009 | Dec 24, 2008 |
| 4/A | OYO CORP USA FORM 4/A FOR 12/29/08 FILING | 0001181431-09-000323 | Jan 5, 2009 | Dec 24, 2008 |
| 4/A | KATSUHIKO KOBAYASHI FORM 4/A FOR 12/31/08 FILING | 0001181431-09-000322 | Jan 5, 2009 | Dec 29, 2008 |
| 4/A | OYO CORP FORM 4/A FOR 12/31/08 FILING | 0001181431-09-000321 | Jan 5, 2009 | Dec 29, 2008 |
| 4/A | OYO CORP USA FORM 4/A FOR 12/31/08 FILING | 0001181431-09-000320 | Jan 5, 2009 | Dec 29, 2008 |
| 4/A | KATSUHIKO KOBAYASHI FORM 4/A FOR 12/18 FILING | 0001181431-08-068550 | Dec 22, 2008 | Dec 16, 2008 |
| 4/A | OYO CORP FORM 4/A FOR 12/18 FILING | 0001181431-08-068549 | Dec 22, 2008 | Dec 16, 2008 |
| 4/A | OYO CORP USA FORM 4/A FOR 12/18 FILING | 0001181431-08-068547 | Dec 22, 2008 | Dec 16, 2008 |
| 4/A | CORRECTION FOR MCENTIRE EXERCISE OF OPTIONS | 0001181431-08-049651 | Aug 21, 2008 | Aug 19, 2008 |
| 4/A | AMENDMENT TO SHEEN OPTION EXERCISE | 0001181431-07-066778 | Nov 6, 2007 | Aug 29, 2007 |
| 4/A | AMENDMENT TO OWENS OPTION EXERCISE | 0001181431-07-066428 | Nov 5, 2007 | Aug 29, 2007 |
| 4/A | AMENDMENT TO MCENTIRE OPTION EXERCISE | 0001181431-07-066427 | Nov 5, 2007 | Aug 29, 2007 |
| 4/A | ADDING HALL OPTION INFORMATION | 0001181431-05-047407 | Aug 17, 2005 | Apr 16, 1998 |
| 4/A | FORM 4A / HALL / JAN 2004 | 0001181431-04-006225 | Feb 4, 2004 | Apr 16, 1998 |