Who owns Geospace Technologies Corporation (GEOS)
Which tracked institutional funds hold GEOS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See GEOS company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on GEOS is one-sided between 2025-Q4 and 2026-Q1: 7 added or opened and 21 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
GEOS’s largest tracked holder by dollar value, DISCIPLINED GROWTH INVESTORS INC /MN, sizes it at 0.3% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.3pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in GEOS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 86 tracked filers holding GEOS, 43 increased or opened the position and 44 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in GEOS between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 2
- VANGUARD CAPITAL MANAGEMENT LLC$7M
- VANGUARD FIDUCIARY TRUST CO$928K
Full exits 4
- VANGUARD GROUP INC$11M
- GOLDMAN SACHS GROUP INC$1M
- Brooklyn Investment Group$762K
- Peapod Lane Capital LLC$639K
Largest adds
- MARSHALL WACE, LLP$2M
- SEI INVESTMENTS CO$2M
- GRACE & WHITE INC /NY$568K
- BNP PARIBAS FINANCIAL MARKETS$273K
- MILLENNIUM MANAGEMENT LLC$261K
Largest trims
- Moors & Cabot, Inc.$7M
- DISCIPLINED GROWTH INVESTORS INC /MN$6M
- First Eagle Investment Management, LLC$4M
- Tieton Capital Management, LLC$4M
- DIMENSIONAL FUND ADVISORS LP$3M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$2M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| DISCIPLINED GROWTH INVESTORS INC /MN trimmed | 1,101,426 | $13M | 12.8% | 2026-Q1 |
| Tieton Capital Management, LLC added | 912,118 | $11M | 10.6% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 577,032 | $7M | 6.7% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 491,016 | $6M | 5.7% | 2026-Q1 |
| GRACE & WHITE INC /NY added | 473,201 | $6M | 5.5% | 2026-Q1 |
| SEI INVESTMENTS CO added | 410,906 | $5M | 4.8% | 2026-Q1 |
| First Eagle Investment Management, LLC trimmed | 240,000 | $3M | 2.8% | 2026-Q1 |
| BlackRock, Inc. added | 225,568 | $3M | 2.6% | 2026-Q1 |
| Moors & Cabot, Inc. trimmed | 190,600 | $2M | 2.2% | 2026-Q1 |
| MARSHALL WACE, LLP added | 188,806 | $2M | 2.2% | 2026-Q1 |
| Glenorchy Capital Ltd added | 173,339 | $2M | 2.0% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 152,154 | $2M | 1.8% | 2026-Q1 |
| De Lisle Partners LLP | 147,133 | $2M | 1.7% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 146,395 | $2M | 1.7% | 2026-Q1 |
| STATE STREET CORP added | 136,853 | $2M | 1.6% | 2026-Q1 |
| US BANCORP \DE\ | 127,134 | $2M | 1.5% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 107,386 | $1M | 1.2% | 2026-Q1 |
| EagleClaw Capital Managment, LLC added | 82,015 | $1M | 1.0% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 78,793 | $961K | 0.9% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 76,065 | $928K | 0.9% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 73,907 | $902K | 0.9% | 2026-Q1 |
| Cambridge Investment Research Advisors, Inc. trimmed | 44,297 | $540K | 0.5% | 2026-Q1 |
| NORTHERN TRUST CORP added | 40,596 | $495K | 0.5% | 2026-Q1 |
| 683 Capital Management, LLC | 39,252 | $479K | 0.5% | 2026-Q1 |
| IRONWOOD INVESTMENT MANAGEMENT LLC trimmed | 36,042 | $440K | 0.4% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 32,718 | $399K | 0.4% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 29,319 | $358K | 0.3% | 2026-Q1 |
| Kingsview Wealth Management, LLC new | 28,322 | $346K | 0.3% | 2026-Q1 |
| ELEVATION POINT WEALTH PARTNERS, LLC added | 24,355 | $297K | 0.3% | 2026-Q1 |
| Vestmark Advisory Solutions, Inc. added | 24,313 | $297K | 0.3% | 2026-Q1 |
| Mraz, Amerine & Associates, Inc. | 24,081 | $294K | 0.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 23,442 | $286K | 0.3% | 2026-Q1 |
| Hudson Bay Capital Management LP added | 22,293 | $272K | 0.3% | 2026-Q1 |
| Qube Research & Technologies Ltd trimmed | 21,909 | $267K | 0.3% | 2026-Q1 |
| COMMONWEALTH EQUITY SERVICES, LLC | 21,885 | $267K | 0.3% | 2026-Q1 |
| Empowered Funds, LLC trimmed | 20,291 | $248K | 0.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 18,060 | $220K | 0.2% | 2026-Q1 |
| Tannin Capital LLC added | 17,209 | $210K | 0.2% | 2026-Q1 |
| MORGAN STANLEY trimmed | 16,518 | $202K | 0.2% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC added | 16,282 | $199K | 0.2% | 2026-Q1 |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 13,636 | $166K | 0.2% | 2026-Q1 |
| IMC-Chicago, LLC added | 13,498 | $165K | 0.2% | 2026-Q1 |
| BARCLAYS PLC trimmed | 11,866 | $145K | 0.1% | 2026-Q1 |
| OMERS ADMINISTRATION Corp trimmed | 11,100 | $135K | 0.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 10,335 | $126K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 10,178 | $124K | 0.1% | 2026-Q1 |
| HUB Investment Partners, LLC new | 10,000 | $122K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 5,026 | $61K | 0.1% | 2026-Q1 |
| GROUP ONE TRADING LLC added | 2,575 | $31K | 0.0% | 2026-Q1 |
| PNC FINANCIAL SERVICES GROUP, INC. added | 2,000 | $24K | 0.0% | 2026-Q1 |
| SBI Securities Co., Ltd. added | 1,806 | $22K | 0.0% | 2026-Q1 |
| OSAIC HOLDINGS, INC. trimmed | 1,643 | $20K | 0.0% | 2026-Q1 |
| TrinityBridge Ltd new | 1,600 | $19K | 0.0% | 2026-Q1 |
| UBS Group AG trimmed | 1,401 | $17K | 0.0% | 2026-Q1 |
| Steward Partners Investment Advisory, LLC new | 1,200 | $15K | 0.0% | 2026-Q1 |
| CITIGROUP INC trimmed | 1,126 | $14K | 0.0% | 2026-Q1 |
| FMR LLC trimmed | 1,109 | $14K | 0.0% | 2026-Q1 |
| JONES FINANCIAL COMPANIES LLLP added | 1,060 | $13K | 0.0% | 2026-Q1 |
| CoreCap Advisors, LLC | 950 | $12K | 0.0% | 2026-Q1 |
| Larson Financial Group LLC new | 858 | $10K | 0.0% | 2026-Q1 |
| Parvin Asset Management, LLC | 750 | $9K | 0.0% | 2026-Q1 |
| Truvestments Capital LLC new | 745 | $9K | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC added | 648,222 | $11M | 10.4% | 2025-Q4 stale |
| GOLDMAN SACHS GROUP INC added | 60,136 | $1M | 1.0% | 2025-Q4 stale |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 53,499 | $1M | 1.0% | 2025-Q3 stale |
| Informed Momentum Co LLC added | 45,837 | $869K | 0.8% | 2025-Q3 stale |
| Brooklyn Investment Group added | 43,799 | $762K | 0.7% | 2025-Q4 stale |
| Peapod Lane Capital LLC trimmed | 37,817 | $639K | 0.6% | 2025-Q4 stale |
| SummitTX Capital, L.P. new | 37,196 | $530K | 0.5% | 2025-Q2 stale |
| Squarepoint Ops LLC trimmed | 26,803 | $508K | 0.5% | 2025-Q3 stale |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 24,800 | $470K | 0.4% | 2025-Q3 stale |
| AlphaQuest LLC added | 27,604 | $467K | 0.4% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC added | 22,770 | $432K | 0.4% | 2025-Q3 stale |
| ExodusPoint Capital Management, LP added | 25,049 | $424K | 0.4% | 2025-Q4 stale |
| JANE STREET GROUP, LLC trimmed | 24,918 | $421K | 0.4% | 2025-Q4 stale |
| GSA CAPITAL PARTNERS LLP added | 24,520 | $415K | 0.4% | 2025-Q4 stale |
| XTX Topco Ltd new | 22,936 | $388K | 0.4% | 2025-Q4 stale |
| ACADIAN ASSET MANAGEMENT LLC added | 22,058 | $372K | 0.4% | 2025-Q4 stale |
| STRS OHIO | 50,900 | $367K | 0.3% | 2025-Q1 stale |
| Brevan Howard Capital Management LP added | 21,479 | $306K | 0.3% | 2025-Q2 stale |
| Y-Intercept (Hong Kong) Ltd added | 20,184 | $288K | 0.3% | 2025-Q2 stale |
| FourThought Financial Partners, LLC new | 16,339 | $276K | 0.3% | 2025-Q4 stale |
| LPL Financial LLC new | 13,200 | $223K | 0.2% | 2025-Q4 stale |
| Bank of New York Mellon Corp added | 30,601 | $221K | 0.2% | 2025-Q1 stale |
| HRT FINANCIAL LP trimmed | 10,805 | $204K | 0.2% | 2025-Q3 stale |
| ARS Wealth Advisors Group, LLC new | 12,550 | $179K | 0.2% | 2025-Q2 stale |
| Balyasny Asset Management L.P. trimmed | 10,530 | $178K | 0.2% | 2025-Q4 stale |
| Jain Global LLC new | 11,578 | $165K | 0.2% | 2025-Q2 stale |
| LSV ASSET MANAGEMENT | 18,043 | $130K | 0.1% | 2025-Q1 stale |
| Nuveen, LLC new | 16,684 | $120K | 0.1% | 2025-Q1 stale |
| CIBC Private Wealth Group LLC trimmed | 6,650 | $112K | 0.1% | 2025-Q4 stale |
| Point72 Asia (Singapore) Pte. Ltd. trimmed | 5,371 | $102K | 0.1% | 2025-Q3 stale |
| VICTORY CAPITAL MANAGEMENT INC | 6,911 | $99K | 0.1% | 2025-Q2 stale |
| Tower Research Capital LLC (TRC) added | 5,230 | $88K | 0.1% | 2025-Q4 stale |
| Kestra Advisory Services, LLC new | 3,952 | $67K | 0.1% | 2025-Q4 stale |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 7,241 | $52K | 0.0% | 2025-Q1 stale |
| RAYMOND JAMES FINANCIAL INC new | 3,569 | $51K | 0.0% | 2025-Q2 stale |
| Corebridge Financial, Inc. trimmed | 5,965 | $43K | 0.0% | 2025-Q1 stale |
| Police & Firemen's Retirement System of New Jersey new | 4,043 | $29K | 0.0% | 2025-Q1 stale |
| Quantbot Technologies LP new | 1,073 | $20K | 0.0% | 2025-Q3 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.