[SCHEDULE 13G/A] GEOSPACE TECHNOLOGIES CORP SEC Filing

Rhea-AI Filing Summary

Dimensional Fund Advisors LP filed an amendment to Schedule 13G reporting ownership of 628,404 shares of Geospace Technologies Corp common stock, representing 4.9% of the class. Dimensional states these shares are held on behalf of various registered investment companies, commingled funds, group trusts and separate accounts (the "Funds") and disclaims beneficial ownership, noting that all securities reported are owned by the Funds. The filing shows 614,158 shares as sole voting power and 628,404 shares as sole dispositive power. The filing certifies the holdings were acquired in the ordinary course of business and not for the purpose of changing control.

Positive

• Transparent disclosure of aggregate holdings of 628,404 shares (4.9%) by a reputable institutional adviser
• Clear separation of voting and dispositive power showing adviser-managed voting authority over 614,158 shares

Negative

• No material negatives disclosed; position remains below the 5% threshold that typically triggers heightened market scrutiny

Insights

Institutional Ownership Analyst

Large institutional stake disclosed as passive ownership under 5%.

Dimensional reports 628,404 shares, or 4.9% of the class, held in pooled vehicles and managed accounts where Dimensional acts as adviser but disclaims beneficial ownership. The holding pattern—majority in sole dispositive and voting power—indicates control of proxy votes for the Funds rather than direct proprietary ownership.

Risks center on potential voting coordination limits tied to the adviser relationship; the filing affirms the position is held in the ordinary course of business and not to influence control. Monitor quarterly 13G/A updates or any 13D filings that would indicate a change in intent or a stake exceeding 5%.

Corporate Governance Specialist

Disclosure clarifies adviser-client structure and voting/dispositive breakdowns.

The schedule distinguishes 614,158 shares with sole voting power from the total 628,404 shares with sole dispositive power, which matters for proxy outcomes where votes are cast by adviser-directed accounts. The statement that no single Fund is known to hold more than 5% reduces immediate takeover or control concerns.

Investors should track any changes to voting power or concentration among Funds and review future amendments near board actions or contested votes; material shifts would typically appear on subsequent filings within days of the triggering event.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Geospace Technologies Corp

(Name of Issuer)

Common Stock

(Title of Class of Securities)

37364X109

(CUSIP Number)

09/30/2025

(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

Dimensional Fund Advisors LP

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 614,158.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 628,404.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

628,404.00

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)

4.9 %

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 Drive, Houston, TX 77040
Item 2.
(a)	Name of person filing: Dimensional Fund Advisors LP
(b)	Address or principal business office or, if none, residence: 6300 Bee Cave Road, Building One, Austin, TX 78746
(c)	Citizenship: Delaware Limited Partnership
(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: 628,404 ** see Note 1 ** ** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)	Percent of class: 4.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 614,158** see Note 1 **
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 628,404** see Note 1 **
	(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.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all such securities.
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.

Dimensional Fund Advisors LP

Signature:	Selwyn Notelovitz
Name/Title:	Global Chief Compliance Officer
Date:	10/09/2025

FAQ

What stake in GEOS does Dimensional Fund Advisors LP hold?

Dimensional reports holding 628,404 shares, representing 4.9% of Geospace Technologies Corp common stock.

Does Dimensional claim beneficial ownership of the GEOS shares?

No; Dimensional states the shares are owned by Funds it advises and expressly disclaims beneficial ownership.

How many shares does Dimensional have voting power over?

The filing reports 614,158 shares as shares for which Dimensional has sole voting power.

Was this filing made as a passive Schedule 13G or an active Schedule 13D?

This is a Schedule 13G amendment indicating a passive investor disclosure; it states the position was acquired in the ordinary course of business and not to influence control.

Does any single Fund hold more than 5% of GEOS according to the filing?

Dimensional states that to its knowledge no single Fund holds more than 5% of the class.