GEOSPACE TECHNOLOGIES CORP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

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Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission only (as permitted by Rule 14a-6(e)(2))

☒ Definitive Proxy Statement

☐ Definitive Additional Materials

☐ Soliciting Material Pursuant to § 240.14a-12

Geospace Technologies Corporation (Name of Registrant as Specified in its Charter)

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☒ No fee required. ☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25 per Exchange Act Rules 14a-6(i)(1) and 0-11.

Dear Fellow Stockholder:

I am pleased to invite you to attend Geospace Technologies Corporation’s 2026 Annual Meeting of Stockholders. We will hold the Annual Meeting at 10:30 a.m. central time on February 5, 2026, virtually via live webcast at meetnow.global/M5VLWUJ.

Following this letter you will find the formal Notice of Meeting and a proxy statement which describes the action to be taken at the Annual Meeting. We have also enclosed a copy of our 2025 Annual Report. We encourage you to read these materials. Information on how to participate in this year’s virtual meeting can be found in the proxy statement.

Your vote is important.Please promptly vote your shares by submitting your proxy by internet or by telephone or by completing, signing, dating and returning your proxy card or voting instruction form, whether or not you plan to attend the Annual Meeting. If you attend the Annual Meeting you may vote virtually even if you have previously submitted a signed and dated proxy. Instructions for telephonic or electronic voting can be found at www.edocumentview.com/geos. A list of stockholders of record will be available during the Annual Meeting for inspection by stockholders for any legally valid purpose related to the Annual Meeting. Stockholders interested in inspecting the list of stockholders during the Annual Meeting should contact our investor relations department at investorquestions@geospace.com for additional information.

In addition to solicitation by use of the mails, certain of our officers and employees may solicit the return of proxies personally or by telephone, electronic mail or facsimile. The cost of any solicitation of proxies will be borne by us.

The Board of Directors recommends that you vote (i)FOR the election of the Company nominated Class I directors, (ii)FOR the ratification of the appointment by the audit committee of the Board of Directors of RSM US LLP, independent public accountants, as our auditors for the fiscal year ending September 30, 2026, and (iii)FOR the approval of the non-binding, advisory resolution regarding the compensation of Geospace Technologies Corporation’s named executive officers.

Thank you for your cooperation. The Board of Directors and I look forward to seeing you at the Annual Meeting.

Very truly yours, Richard J. Kelley President and Chief Executive Officer