Core Laboratories CLB Institutional Ownership

Updated Oct 11, 2026

Core Laboratories Inc. (NYSE:CLB) counted 186 institutional investors among its 13F-reported shareholders for the quarter ended June 30, 2026.

• Total shares held in CLB rose 4.27% from Q1 2026; the number of holders fell 0.53% from Q2 2025.
• Of the 186 holders, 89 added to their positions, 67 reduced their stakes and 30 left their positions unchanged in Q2 2026.
• In total, institutional investors held 52.69Mn shares of Core Laboratories at the end of Q2 2026, up 2.16Mn from the prior quarter and up 4.71Mn from a year earlier.
• Ariel Investments, LLC led 13F holders of CLB with 14.07Mn shares as of June 30, 2026.
• The largest position increases in CLB for Q2 2026 were by Heartland Advisors Inc (+908.31K shares), Ariel Investments, LLC (+904.56K shares), Jeffrey L. Gendell (+442.51K shares), BlackRock, Inc. (+251.62K shares) and Citadel Advisors LLC (+216.81K shares).
• The biggest cuts to CLB positions during Q2 2026 came from Disciplined Growth Investors Inc (-1.89Mn shares), T. Rowe Price Investment Management, Inc. (-618.86K shares), American Century Companies Inc (-352.4K shares), Fisher Asset Management, LLC (-288.8K shares) and Bank of America Corp (-137.33K shares).
• Per Business Quant, the top 10 investors in CLB for the quarter ended June 30, 2026 were Ariel Investments, LLC (14.07Mn shares), BlackRock, Inc. (7.46Mn shares), Disciplined Growth Investors Inc (3.04Mn shares), Earnest Partners LLC (2.94Mn shares), State Street Corp (2.18Mn shares), CWA Asset Management Group, LLC (1.76Mn shares), Vanguard Capital Management LLC (1.59Mn shares), Dimensional Fund Advisors LP (1.55Mn shares), Schroder Investment Management Group (1.54Mn shares) and Vanguard Portfolio Management LLC (1.28Mn shares).