Disciplined Growth Investors Inc Discloses 10.7% Stake in Core Laboratories Inc. (CLB)

Disciplined Growth Investors, Inc. filed a Schedule 13G/A on May 15, 2026, disclosing a significant increase in its stake in Core Laboratories Inc. (CLB). As of the event date of March 31, 2026, the Minneapolis-based investment adviser reported beneficial ownership of 4,937,115 common shares, representing 10.7% of the company's outstanding stock. This reflects a substantial jump from a previously reported 0.0% position, marking a major new institutional holding for the firm. Of the total shares held, the filer maintains sole dispositive power over all 4,937,115 shares and sole voting power over 4,653,638 shares. The filing, an amendment No. 6, was made under Rule 13d-1(b), indicating that the securities were acquired in the ordinary course of business and not for the purpose of influencing or changing the control of the issuer. The total value of the position is estimated at approximately $66.5 million based on the filing data.