Disciplined Growth Investors reports 8.8% stake in Geospace (GEOS)

Rhea-AI Filing Summary

Disciplined Growth Investors, Inc., a Minnesota-based investment adviser, reported beneficial ownership of Geospace Technologies Corp common stock. The firm holds 1,131,568 shares, representing 8.8% of the outstanding common stock, with sole power to vote and dispose of all these shares.

The shares were acquired and are held in the ordinary course of business, and the firm states they were not acquired to change or influence control of Geospace Technologies. No group or subsidiary relationships are reported in connection with this ownership.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 9)

GEOSPACE TECHNOLOGIES CORP

(Name of Issuer)

Common Stock

(Title of Class of Securities)

37364X109

(CUSIP Number)

12/31/2025

(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 1,131,568.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,131,568.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,131,568.00

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)

8.8 %

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: 1,131,568
(b)	Percent of class: 8.8%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,131,568
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1,131,568
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
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:	02/17/2026

FAQ

What ownership stake in GEOS does Disciplined Growth Investors report?

Disciplined Growth Investors reports beneficial ownership of 1,131,568 shares of Geospace Technologies common stock. This position represents 8.8% of the company’s outstanding common stock, giving the firm a significant institutional stake in the issuer.

Does Disciplined Growth Investors have voting control over its GEOS shares?

Disciplined Growth Investors reports sole power to vote 1,131,568 shares of Geospace Technologies. It also has sole dispositive power over the same number of shares, with no shared voting or shared dispositive power indicated in the filing.

Is Disciplined Growth Investors acting to influence control of GEOS?

The firm states the GEOS shares were acquired and are held in the ordinary course of business. It specifically certifies they were not acquired and are not held for the purpose or effect of changing or influencing control of Geospace Technologies.

What type of investor is Disciplined Growth Investors in relation to GEOS?

Disciplined Growth Investors, Inc. is described as a Minnesota, USA-based entity and is identified in the Schedule 13G/A context as an investment adviser. It reports beneficial ownership directly, with no subsidiaries or groups listed as holding the GEOS shares.

Where is Geospace Technologies, the issuer of GEOS, headquartered?

Geospace Technologies Corp’s principal executive offices are listed at 7007 Pinemont Dr., Houston, Texas 77040. This address identifies the company’s main corporate location associated with the common stock held by Disciplined Growth Investors.

When did the ownership level triggering this GEOS filing occur?

The filing identifies 12/31/2025 as the date of the event requiring the statement. That date marks when the reported ownership level in Geospace Technologies common stock became subject to Schedule 13G/A reporting requirements.