Geospace Technologies Corp: which funds bought and sold

Institutions that bought and sold Geospace Technologies shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 44 institutions that filed 13F reports for both quarters added to or opened positions in Geospace Technologies, and 42 cut or closed them. Together they sold a net 1.5M shares, −22.9% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 1.3M shares (−65.5%); index fund managers were net sellers of 40K shares (−3.3%). 20 opened a new position and 21 sold out entirely.

Bought, Q2 2026 44 institutions, 20 of them new holders Sold, Q2 2026 42 institutions, 21 of them sold out

Net change, all compared −1.5M shares (−22.9%)

Net change, active managers −1.3M shares (−65.5%), 8 bought, 8 sold

Buyers versus sellers

institutions compared, 104

44 bought 18 42 sold

Active managers and hedge funds 8 bought · 8 sold · −1.3M

Index fund managers 4 bought · 4 sold · −40K

Other institutions 32 bought · 30 sold · −218K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Grace & White Inc	+200K +42.3%	673K	$4.6M
Robotti Robert	+128K New position	128K	$869,512
Marshall Wace, LLP Hedge fund	+113K +59.9%	302K	$2M
Us Bancorp	+86K +67.4%	213K	$1.4M
Renaissance Technologies LLC Hedge fund	+44K New position	44K	$299,904
Acadian Asset Management LLC Active manager	+43K New position	43K	$286,000
Jacobs Levy Equity Management, Inc Active manager	+36K New position	36K	$240,829
HRT Financial LP	+31K New position	31K	$207,000
State Street Corp Index funds	+26K +19.2%	163K	$1.1M
Goldman Sachs Group Inc	+26K New position	26K	$174,666
Citadel Advisors LLC Hedge fund	+25K +77.3%	58K	$392,782
Jane Street Group, LLC	+21K New position	21K	$144,005
Axq Capital, LP	+20K New position	20K	$132,942
Gsa Capital Partners LLP	+15K New position	15K	$105,000
Cambridge Investment Research Advisors, Inc.	+15K +34.8%	60K	$404,000
Xtx Topco Ltd	+13K New position	13K	$90,955
Invesco Ltd.	+13K New position	13K	$85,844
Geode Capital Management, LLC Index funds	+12K +7.9%	164K	$1.1M
Imc-Chicago, LLC	+9,634 +71.4%	23K	$156,604
Two Sigma Investments, LP Hedge fund	+8,277 +11.2%	82K	$556,386

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Marshall Wace, LLP Hedge fund	+113K +59.9%	302K	$2M
Renaissance Technologies LLC Hedge fund	+44K New position	44K	$299,904
Acadian Asset Management LLC Active manager	+43K New position	43K	$286,000
Jacobs Levy Equity Management, Inc Active manager	+36K New position	36K	$240,829
Citadel Advisors LLC Hedge fund	+25K +77.3%	58K	$392,782
Two Sigma Investments, LP Hedge fund	+8,277 +11.2%	82K	$556,386
Bridgeway Capital Management, LLC Active manager	+900 +1.1%	80K	$539,522
FMR LLC Active manager	+85 +7.7%	1,194	$8,083

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Disciplined Growth Investors Inc Active manager	−1.1M Sold out	0	—
First Eagle Investment Management, LLC Active manager	−240K Sold out	0	—
Sei Investments Co	−212K −51.5%	199K	$1.3M
Moors & Cabot, Inc.	−171K −89.8%	20K	$132,015
Susquehanna International Group, LLP	−113K −77.4%	33K	$223,606
Millennium Management LLC Hedge fund	−107K Sold out	0	—
Glenorchy Capital Ltd	−105K −60.5%	68K	$463,666
Dimensional Fund Advisors LP	−99K −20.1%	392K	$2.7M
Vanguard Capital Management LLC Index funds	−62K −10.7%	515K	$3.5M
683 Capital Management, LLC Hedge fund	−39K Sold out	0	—
Eagleclaw Capital Managment, LLC	−32K −39.0%	50K	$338,602
BNP Paribas Financial Markets	−23K −99.7%	76	$515
Hudson Bay Capital Management LP Hedge fund	−22K Sold out	0	—
Qube Research & Technologies Ltd Hedge fund	−22K Sold out	0	—
Bank Of America Corp	−18K Sold out	0	—
Schonfeld Strategic Advisors LLC Hedge fund	−16K Sold out	0	—
Essex Investment Management Co LLC	−14K Sold out	0	—
Northern Trust Corp Index funds	−12K −29.3%	29K	$194,414
Barclays PLC	−12K Sold out	0	—
Omers Administration Corp	−11K Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Disciplined Growth Investors Inc Active manager	−1.1M Sold out	0	—
First Eagle Investment Management, LLC Active manager	−240K Sold out	0	—
Millennium Management LLC Hedge fund	−107K Sold out	0	—
683 Capital Management, LLC Hedge fund	−39K Sold out	0	—
Hudson Bay Capital Management LP Hedge fund	−22K Sold out	0	—
Qube Research & Technologies Ltd Hedge fund	−22K Sold out	0	—
Schonfeld Strategic Advisors LLC Hedge fund	−16K Sold out	0	—
American Century Companies Inc Active manager	−1,118 −3.8%	28K	$190,921

New positions

largest by value

Institution	Shares	Value June 30, 2026
Robotti Robert	128K	$869,512
Renaissance Technologies LLCHedge fund	44K	$299,904
Acadian Asset Management LLCActive manager	43K	$286,000
Jacobs Levy Equity Management, IncActive manager	36K	$240,829
HRT Financial LP	31K	$207,000
Goldman Sachs Group Inc	26K	$174,666
Jane Street Group, LLC	21K	$144,005
Axq Capital, LP	20K	$132,942
Gsa Capital Partners LLP	15K	$105,000
Xtx Topco Ltd	13K	$90,955

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Disciplined Growth Investors IncActive manager	1.1M	$13.4M
First Eagle Investment Management, LLCActive manager	240K	$2.9M
Millennium Management LLCHedge fund	107K	$1.3M
683 Capital Management, LLCHedge fund	39K	$478,874
Hudson Bay Capital Management LPHedge fund	22K	$271,975
Qube Research & Technologies LtdHedge fund	22K	$267,290
Bank Of America Corp	18K	$220,332
Schonfeld Strategic Advisors LLCHedge fund	16K	$198,640
Essex Investment Management Co LLC	14K	$166,359
Barclays PLC	12K	$144,765

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 83
Ten largest holders: 72.5%
Index fund managers: 22.7%
Active managers and hedge funds: 13.0%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	8	8	3	7	−1.3M	−65.5%
Index fund managers	4	4	0	2	−40K	−3.3%
Other institutions	32	30	17	12	−218K	−6.1%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Geospace Technologies.

Only managers that filed a holdings report for both quarters are compared (104 here). 2 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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