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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K Annual Report Pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 for the Fiscal Year Ended September 30 , 2021 OR Transition Report Pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 Commission file number 001-13601 GEOSPACE TECHNOLOGIES CORPORATION ( Exact Name of Registrant as Specified in Its Charter ) Texas ( State or Other Jurisdiction of Incorporation or Organization ) Title of Each Class Common Stock 7007 Pinemont Drive Houston , Texas 77040-6601 ( Address of Principal Executive Offices ) ( 713 ) 986-4444 ( Registrant's telephone number , including area code ) Securities Registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) GEOS Securities Registered pursuant to Section 12 ( g ) of the Act : 76-0447780 ( I.R.S. Employer Identification No. ) Name of Each Exchange on Which Registered The NASDAQ Global Select Market NONE No | Indicate by check mark if the Registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No > Indicate by check mark whether the Registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the Registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the Registrant was required to submit such files ) . Yes No Indicate by check mark whether the Registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See definitions of " large accelerated filer " , " accelerated filer ” , “ smaller reporting company " , and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer □ Accelerated filer Non - accelerated filer > Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . □ Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No > There were 12,917,574 shares of the Registrant's Common Stock outstanding as of the close of business on October 31 , 2021. As of March 31 , 2021 , the aggregate market value of the Registrant's Common Stock held by non - affiliates was approximately $ 118 million ( based upon the closing price of $ 9.12 on March 31 , 2021 , as reported by The NASDAQ Global Select Market ) . DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive proxy statement for the Registrant's 2022 Annual Meeting of Stockholders are incorporated by reference into Part III of this report .