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GEOSPACE TECHNOLOGIES CORP — DEFA14A Filings

4 DEFA14A filings on record

This page lists all DEFA14A 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 4 DEFA14A documents with the SEC since 1997. To view all SEC filings by GEOSPACE TECHNOLOGIES CORP, see the full filings list.

Overview All Filings Financials Insiders
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
DEFA14A FORM DEFA14A 0001437749-25-038639 Dec 23, 2025 —
DEFA14A FORM DEFA14A 0001437749-24-038443 Dec 27, 2024 —
DEFA14A — 0001181431-13-039596 Jul 11, 2013 —
DEFA14A DEFINITIVE ADDITIONAL MATERIALS 0001193125-13-035906 Feb 4, 2013 —