Disciplined Growth Investors Reports 8.5% Stake in Geospace Technologies Corp

On May 15, 2026, Disciplined Growth Investors, Inc. filed a Schedule 13G/A with the SEC, reporting a significant new position in Geospace Technologies Corp (GEOS). As of the event date of March 31, 2026, the Minneapolis-based investment adviser disclosed beneficial ownership of 1,101,426 shares of common stock. This holding represents an 8.5% ownership stake in the company. The filing indicates that Disciplined Growth Investors, Inc. holds sole voting and sole dispositive power over all 1,101,426 shares. Compared to the previous reported ownership of 0.0%, this filing marks a substantial increase in the firm's investment in Geospace Technologies. The securities were acquired in the ordinary course of business and are not held for the purpose of changing or influencing the control of the issuer. This amendment (No. 10) reflects the firm's status as an investment adviser and confirms their significant minority interest in the Houston-based technology company.