As of November 6, 2026, one holder's latest Schedule 13D or 13G filing report owning 5% or more of Geospace Technologies Corp. The largest reported stake is Grace & White Inc's, at 6.13%. 13 filings are on record since July 17, 2025 (Schedule 13G, October 7, 2026).
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Key facts
- · Reporting person: Grace & White Inc · Sole voting: 300,522 · Shared voting: 0 · Sole dispositive: 793,498 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-07
- · Reporting person: Disciplined Growth Investors Inc · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Vanguard Capital Management · Sole voting: 81,612 · Shared voting: 0 · Sole dispositive: 596,679 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-07-31
- · Holder: Disciplined Growth Investors Inc · Percent: 8.5% · SCHEDULE 13G/A
- · Holder: Vanguard Capital Management · Percent: 5.1% · SCHEDULE 13G
Geospace Technologies Corp has 13 Schedule 13D or 13G filings on record since 2025-07-17. 1 holder's latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Layoffs on record: 1 filing or notice, latest 2026-04-06 (layoff filings and notices).
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Grace & White Inc | 6.13% | 793,498 | SCHEDULE 13G, 2026-10-07 | 2026-09-30 |
| Dimensional Fund Advisors LP | 4.9% | 628,404 | SCHEDULE 13G/A, 2025-10-09 | 2025-09-30 |
| Vanguard Capital Management | 4.61% | 596,679 | SCHEDULE 13G/A, 2026-07-31 | 2026-06-30 |
| BlackRock, Inc. | 2.7% | 341,602 | SCHEDULE 13G/A, 2025-07-17 | 2025-06-30 |
| Disciplined Growth Investors Inc | 0% | 0 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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Keep reading
More on Geospace Technologies Corp and the records around it.
Geospace Technologies Corp elsewhere on the record
- Layoff notices Apr 2026
- Who owns it
Companies that share a holder
- GRACE & WHITE INC /NY also filed stake reports on 4 other companies: WESTPORT FUEL SYSTEMS INC. (Jan 2026), Orion Energy Systems, Inc. (Jan 2026)
- DISCIPLINED GROWTH INVESTORS INC /MN also filed stake reports on 10 other companies: Alarm.com Holdings, Inc. (Aug 2026), Kornit Digital Ltd. (Aug 2026), Stitch Fix, Inc. (Aug 2026)
- Dimensional Fund Advisors LP also filed stake reports on 366 other companies: Acadia Healthcare Co Inc (Oct 2026), ADT Inc (Oct 2026), AGCO Corp (Oct 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Grace & White Inc | 300,522 | 0 | 793,498 | 0 | SCHEDULE 13G, 2026-10-07 |
| Vanguard Capital Management | 81,612 | 0 | 596,679 | 0 | SCHEDULE 13G/A, 2026-07-31 |
| Disciplined Growth Investors Inc | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-08-14 |
The latest filing identifies Geospace Technologies Corp by CUSIP 37364X109 and gives its principal executive office as 7007 Pinemont Dr., Houston, TX 77040 (SCHEDULE 13G, 2026-10-07).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-17 | BlackRock, Inc. | 2.7% | SCHEDULE 13G/A |
| 2025-08-14 | Disciplined Growth Investors Inc | 9.7% | SCHEDULE 13G/A |
| 2025-10-09 | Dimensional Fund Advisors LP | 4.9% | SCHEDULE 13G/A |
| 2025-10-30 | The Vanguard Group | 4.94% | SCHEDULE 13G/A |
| 2025-11-14 | Disciplined Growth Investors Inc | 9% | SCHEDULE 13G/A |
| 2026-01-30 | The Vanguard Group | 5.02% | SCHEDULE 13G |
| 2026-02-17 | Disciplined Growth Investors Inc | 8.8% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Capital Management | 5.1% | SCHEDULE 13G |
| 2026-05-15 | Disciplined Growth Investors Inc | 8.5% | SCHEDULE 13G/A |
| 2026-07-31 | Vanguard Capital Management | 4.61% | SCHEDULE 13G/A |
| 2026-08-14 | Disciplined Growth Investors Inc | 0% | SCHEDULE 13G/A |
| 2026-10-07 | Grace & White Inc | 6.13% | SCHEDULE 13G |
Questions about who owns Geospace Technologies Corp
Who owns Geospace Technologies Corp?
On this page, one holder's latest ownership filing reports 5% or more of Geospace Technologies Corp: Grace & White Inc (6.13%, Schedule 13G, filed 2026-10-07).
When did Grace & White Inc buy into Geospace Technologies Corp?
The filings give report dates, not purchase dates. The earliest filing from Grace & White Inc on this page is the Schedule 13G, filed 2026-10-07, reporting 6.13%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 13 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.