Geospace holder exits with 0% reported ownership

Rhea-AI Filing Summary

Disciplined Growth Investors, Inc. filed an amended Schedule 13G/A regarding its position in Geospace Technologies Corp. The firm now reports beneficial ownership of 0 shares of Geospace common stock, representing 0.0% of the class, with no sole or shared voting or dispositive power over any shares.

Key Figures

Beneficially owned shares: 0 shares Percent of class: 0.0% Sole voting power: 0 +3 more

6 metrics

Beneficially owned shares 0 shares Amount beneficially owned by Disciplined Growth Investors, Inc.

Percent of class 0.0% Percent of Geospace Technologies Corp common stock class owned

Sole voting power 0 Shares for which sole power to vote or direct the vote is held

Shared voting power 0 Shares for which shared power to vote or direct the vote is held

Sole dispositive power 0 Shares for which sole power to dispose or direct disposition is held

Shared dispositive power 0 Shares for which shared power to dispose or direct disposition is held

Key Terms

Schedule 13G/A, beneficial ownership, sole voting power, dispositive power, +1 more

5 terms

Schedule 13G/A regulatory

"Disciplined Growth Investors, Inc. filed an amended Schedule 13G/A"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficial ownership financial

"Amount beneficially owned: 0 (b) | Percent of class: 0.0%"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

sole voting power financial

"Sole power to vote or to direct the vote: 0"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power financial

"Sole power to dispose or to direct the disposition of: 0"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Ownership of 5 percent or less of a class regulatory

"Item 5. | Ownership of 5 Percent or Less of a Class."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does this Schedule 13G/A mean for GEOS shareholders?

Disciplined Growth Investors now reports 0 shares and 0.0% ownership of Geospace common stock, indicating it is no longer a significant beneficial owner. The filing confirms no voting or dispositive power over any GEOS shares.

Who filed this Schedule 13G/A for GEOS?

The filing was made by Disciplined Growth Investors, Inc., a Minnesota corporation, regarding its beneficial ownership in Geospace Technologies Corp common stock. The report is signed by Peter G. Rieke, Chief Operating & Compliance Officer.

What percentage of GEOS does Disciplined Growth Investors now own?

Disciplined Growth Investors reports beneficial ownership of 0.0% of the class of Geospace Technologies Corp common stock. It lists 0 shares with no sole or shared voting or dispositive power over any GEOS shares.

Does Disciplined Growth Investors still have voting power in GEOS?

No. The filer discloses 0 shares with 0 sole and 0 shared voting power, and similarly 0 sole and 0 shared dispositive power over Geospace Technologies Corp common stock.

Why does the filing mention ownership of 5 percent or less of GEOS?

The filing indicates ownership of 5 percent or less of Geospace’s common stock, and specifically reports 0 shares and 0.0% of the class, confirming Disciplined Growth Investors is no longer a 5% beneficial owner.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/14/2026 - 04:42 PM Accepted by SEC EDGAR 08/14/2026 - 04:39 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 11)

GEOSPACE TECHNOLOGIES CORP

(Name of Issuer)

Common Stock

(Title of Class of Securities)

37364X109

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 37364X109

1

Names of Reporting Persons

DISCIPLINED GROWTH INVESTORS INC /MN

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

MINNESOTA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.0 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: GEOSPACE TECHNOLOGIES CORP
(b)	Address of issuer's principal executive offices: 7007 PINEMONT DR., 7007 PINEMONT DR., HOUSTON, TEXAS, 77040.
Item 2.
(a)	Name of person filing: Disciplined Growth Investors, Inc.
(b)	Address or principal business office or, if none, residence: 150 South Fifth Street Suite 2550 Minneapolis, MN 55402
(c)	Citizenship: Minnesota, USA
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 37364X109
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 0
(b)	Percent of class: 0.0%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

DISCIPLINED GROWTH INVESTORS INC /MN

Signature:	Peter G. Rieke
Name/Title:	Chief Operating & Compliance Officer
Date:	08/14/2026