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CLB · NYSE · Oil & Gas Equipment & Services

Core Lab (CLB)

Analyzes reservoir rocks and fluids while supplying completion diagnostics and perforating systems.

$12.66

Pre-market+0.19 (+1.52%)

At close$12.47(+0.65%)

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Breakdown13F · 13D/G · Form 4

Institutions188 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail	≈ 116.23%	53.33M shares
Insiders11 holders · as of Aug 4, 2026	1.00%	460.4K shares
Adds to	117.23%

45.88M company shares as of Sep 3, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing

This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.

These groups come from separate filings that can overlap, so they add to 117.23%; nothing is left for Other.

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
Ariel Investments, LLCInstitution	30.67%	14.07M	13Fas of Jun 30, 2026
BlackRock, Inc.Institution	16.26%	7.46M	13Fas of Jun 30, 2026
Disciplined Growth Investors Inc /MNInstitution	6.63%	3.04M	13Fas of Jun 30, 2026
Earnest Partners LLCInstitution	6.41%	2.94M	13Fas of Jun 30, 2026
State Street CorpInstitution	4.74%	2.18M	13Fas of Jun 30, 2026
Cwa Asset Management Group, LLCInstitution	3.83%	1.76M	13Fas of Jun 30, 2026
Vanguard Capital Management LLCInstitution	3.47%	1.59M	13Fas of Jun 30, 2026
Dimensional Fund Advisors LPInstitution	3.37%	1.55M	13Fas of Jun 30, 2026
Schroder Investment Management GroupInstitution	3.36%	1.54M	13Fas of Jun 30, 2026
Vanguard Portfolio Management LLCInstitution	2.78%	1.28M	13Fas of Jun 30, 2026
Geode Capital Management, LLCInstitution	2.60%	1.19M	13Fas of Jun 30, 2026
Gendell Jeffrey LInstitution	2.38%	1.09M	13Fas of Jun 30, 2026
Heartland Advisors IncInstitution	2.31%	1.06M	13Fas of Jun 30, 2026
Goldman Sachs Group IncInstitution	1.64%	751,643	13Fas of Jun 30, 2026
Evergreen Capital Management LLCInstitution	1.46%	669,508	13Fas of Jun 30, 2026
Morgan StanleyInstitution	1.43%	656,146	13Fas of Jun 30, 2026
Northern Trust CorpInstitution	1.33%	608,202	13Fas of Jun 30, 2026
Charles Schwab Investment Management IncInstitution	1.23%	565,065	13Fas of Jun 30, 2026
Sixth Street Partners Management Company, L.P.Institution	1.23%	565,065	13Fas of Jun 30, 2026
T. Rowe Price Investment Management, Inc.Institution	1.06%	485,032	13Fas of Jun 30, 2026
UBS Group AGInstitution	1.01%	461,777	13Fas of Jun 30, 2026
Fisher Asset Management, LLCInstitution	0.98%	447,949	13Fas of Jun 30, 2026
Bank of New York Mellon CorpInstitution	0.87%	401,283	13Fas of Jun 30, 2026
Van Eck Associates CorpInstitution	0.86%	393,682	13Fas of Jun 30, 2026
Citadel Advisors LLCInstitution	0.81%	371,615	13Fas of Jun 30, 2026

13F — a manager's quarterly holdings

Institutions13F, as of Jun 30, 2026

188 holders · 53.33M shares · 32 new positions · 87 increased · 71 reduced · 36 closed

Holder	Shares	% outstanding	Chg q/q	Filed
Ariel Investments, LLC	14.07M	30.67%	+904.6K	Aug 14, 2026
BlackRock, Inc.	7.46M	16.26%	+251.6K	Aug 7, 2026
Disciplined Growth Investors Inc /MN	3.04M	6.63%	−1.89M	Aug 14, 2026
Earnest Partners LLC	2.94M	6.41%	−115.0K	Aug 13, 2026
State Street Corp	2.18M	4.74%	+115.9K	Aug 7, 2026
Cwa Asset Management Group, LLC	1.76M	3.83%	+14.1K	Jul 14, 2026
Vanguard Capital Management LLC	1.59M	3.47%	−29.3K	Aug 13, 2026
Dimensional Fund Advisors LP	1.55M	3.37%	+195.9K	Aug 11, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
Ariel Investments, LLC	29.40%	13.77M	13G	Nov 14, 2025 ↗
BlackRock, Inc.	15.50%	7.26M	13G	Apr 29, 2025 ↗
Disciplined Growth Investors Inc /MN	10.70%	4.94M	13G	May 15, 2026 ↗
Earnest Partners LLC	6.90%	3.22M	13G	Feb 12, 2026 ↗

Insider tradesForm 4

Latest trades

Date	Insider	Type	Shares	Avg price	Owned after
Jul 31, 2026	Lawrence Brunodirector, officer: Chairman and CEO	Purchase	5,000	$10.78	262,438

CongressHouse and Senate disclosures

Not reported.