Schedule 13G/A: Disciplined Growth Discloses 1.24M GEOS Shares

Rhea-AI Filing Summary

Disciplined Growth Investors, Inc. filed an amended Schedule 13G reporting ownership of 1,244,769 shares of Geospace Technologies Corp common stock, representing 9.7% of the class. The filer states it has sole voting and sole dispositive power over all reported shares. The filing includes a certification that the holdings were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer. The filing lists issuer and filer addresses and is signed by the filer's Chief Operating & Compliance Officer.

Positive

• Transparency: The filing clearly discloses a 9.7% beneficial stake and the filer's sole voting and dispositive power.
• Regulatory compliance: Amended Schedule 13G/A and signed certification demonstrate adherence to disclosure requirements.

Negative

• None.

Insights

Financial Analyst

TL;DR: A registered investment adviser reports a near-10% stake with full voting and dispositive control—material but not a change-of-control filing.

The Schedule 13G/A shows Disciplined Growth Investors, Inc. beneficially owns 1,244,769 shares (9.7%). The holder reports sole voting and dispositive power for all shares and certifies the position is held in the ordinary course of business, not to influence control. For investors, this disclosure identifies a sizable, passive institutional holder; it does not signal an activist intent based on the filer’s certification.

Corporate Governance Expert

TL;DR: Ownership disclosure is material for governance visibility but contains no indication of coordinated control actions.

The filing is a routine Schedule 13G/A amendment reflecting beneficial ownership above 5%, triggering public disclosure obligations. The explicit sole voting and dispositive power clarifies who exercises rights attached to the shares. The certification language limits interpretation of intent, indicating the filer does not assert an attempt to affect issuer control. This enhances transparency for board and shareholder oversight.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 7)

GEOSPACE TECHNOLOGIES CORP

(Name of Issuer)

Common Stock

(Title of Class of Securities)

37364X109

(CUSIP Number)

06/30/2025

(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)

SCHEDULE 13G

CUSIP No. 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 1,244,769.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,244,769.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,244,769.00

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)

9.7 %

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, US
(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: 1,244,769
(b)	Percent of class: 9.7%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,244,769
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,244,769
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	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:	08/14/2025

FAQ

How many shares of GEOS does Disciplined Growth Investors own?

The filer reports ownership of 1,244,769 shares of Geospace Technologies Corp common stock.

What percentage of GEOS does Disciplined Growth Investors hold?

The filing states the position represents 9.7% of the class.

Does the filer have voting control over the reported GEOS shares?

Yes. The filer reports sole voting power and sole dispositive power for all 1,244,769 shares.

Is this filing an attempt to change or influence control of GEOS?

No. The filer certified the shares were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control.

Who signed the Schedule 13G/A for Disciplined Growth Investors?

The filing is signed by Peter G. Rieke, Chief Operating & Compliance Officer, dated 08/14/2025.