Core Laboratories N.V. (CLB) Ownership
CLB ownership summary
as of October 18, 2026- Institutions
- 117.3% of shares outstanding
- Insiders
- 1.43% of shares outstanding
- Shares outstanding
- 45.9M
- Float
- 45.2M shares available to trade
- Short interest
- 25.43% 4.9M shares short
- Days to cover
- 8.40 short interest up 18.9% vs prior month
- Institutions 117.35%
- Insiders 1.43%
CLB top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Ariel Investments, LLC | 30.67% | 14.1M | $140.7M | +904,557 (+6.9%) | June 30, 2026 |
| 2 | BlackRock Inc | 16.26% | 7.5M | $74.6M | +251,615 (+3.5%) | June 30, 2026 |
| 3 | Disciplined Growth Investors Inc | 6.63% | 3.0M | $30.4M | −1.9M (−38.4%) | June 30, 2026 |
| 4 | Earnest Partners LLC | 6.41% | 2.9M | $29.4M | −114,992 (−3.8%) | June 30, 2026 |
| 5 | State Street Corp | 4.74% | 2.2M | $21.8M | +115,943 (+5.6%) | June 30, 2026 |
| 6 | CWA Asset Management Group, LLC | 3.83% | 1.8M | $17.6M | +14,084 (+0.8%) | June 30, 2026 |
| 7 | Vanguard Capital Management, LLC | 3.47% | 1.6M | $15.9M | −29,342 (−1.8%) | June 30, 2026 |
| 8 | Dimensional Fund Advisors, Inc. | 3.37% | 1.5M | $15.5M | +195,874 (+14.5%) | June 30, 2026 |
| 9 | Schroder Investment Management Group | 3.36% | 1.5M | $15.4M | +1.5M (0.0%) | June 30, 2026 |
| 10 | Vanguard Portfolio Management, LLC | 2.78% | 1.3M | $12.8M | +20,585 (+1.6%) | June 30, 2026 |
| 11 | Geode Capital Management, LLC | 2.60% | 1.2M | $11.9M | +55,866 (+4.9%) | June 30, 2026 |
| 12 | Gendell Jeffrey L | 2.38% | 1.1M | $10.9M | +442,513 (+68.2%) | June 30, 2026 |
| 13 | Heartland Advisors Inc | 2.31% | 1.1M | $10.6M | +908,311 (+605.5%) | June 30, 2026 |
| 14 | The Goldman Sachs Group Inc | 1.64% | 752K | $7.5M | −97,258 (−11.5%) | June 30, 2026 |
| 15 | Evergreen Capital Management LLC | 1.46% | 670K | $6.7M | +669,508 (0.0%) | June 30, 2026 |
| 16 | Morgan Stanley - Brokerage Accounts | 1.43% | 656K | $6.6M | +209,364 (+46.9%) | June 30, 2026 |
| 17 | Northern Trust Corp | 1.33% | 608K | $6.1M | +42,916 (+7.6%) | June 30, 2026 |
| 18 | Charles Schwab Investment Management Inc | 1.23% | 565K | $5.7M | −121,885 (−17.7%) | June 30, 2026 |
| 19 | T. Rowe Price Investment Management,Inc. | 1.06% | 485K | $4.9M | −618,863 (−56.1%) | June 30, 2026 |
| 20 | UBS Group AG | 1.01% | 462K | $4.6M | +30,124 (+7.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 14 holders added 5.4M shares and 6 cut 2.9M.
CLB top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Ariel Fund Investor | 14.11% | 6.5M | $64.7M | — | September 30, 2026 |
| 2 | Ariel Appreciation Investor | 3.12% | 1.4M | $14.3M | — | September 30, 2026 |
| 3 | iShares Russell 2000 ETF | 2.65% | 1.2M | $12.2M | −14,016 (−1.1%) | September 30, 2026 |
| 4 | Harbor Small Cap Value Instl | 2.40% | 1.1M | $11.0M | −21,323 (−1.9%) | September 30, 2026 |
| 5 | Vanguard MStar Total Stk Mkt Idx Invest | 2.25% | 1.0M | $10.3M | — | August 31, 2026 |
| 6 | Schroder ISF Global Energy C Acc USD | 2.22% | 1.0M | $10.2M | −76,525 (−7.0%) | August 31, 2026 |
| 7 | Heartland Value Investor | 1.96% | 900K | $9.0M | −500,000 (−35.7%) | September 30, 2026 |
| 8 | Fidelity Small Cap Index | 1.11% | 510K | $5.1M | +3,306 (+0.7%) | July 31, 2026 |
| 9 | Columbia Small Cap Value Discv A | 1.07% | 493K | $4.9M | +67,940 (+16.0%) | August 31, 2026 |
| 10 | Vanguard Energy ETF | 0.96% | 438K | $4.4M | −888 (−0.2%) | September 30, 2026 |
| 11 | iShares Russell 2000 Value ETF | 0.94% | 431K | $4.3M | +654 (+0.2%) | September 30, 2026 |
| 12 | Vanguard Explorer Value Inv | 0.93% | 429K | $4.3M | +15,783 (+3.8%) | June 30, 2026 |
| 13 | T. Rowe Price US Smlr Coms Eq A | 0.87% | 398K | $4.0M | −12,595 (−3.1%) | August 31, 2026 |
| 14 | Stt Strt®SPDR®S&P®Oil &GasEqpmnt&SvcsETF | 0.84% | 385K | $3.8M | +5,896 (+1.6%) | September 30, 2026 |
| 15 | DFA US Targeted Value I | 0.73% | 335K | $3.3M | +30,953 (+10.2%) | August 31, 2026 |
| 16 | VanEck Oil Services ETF | 0.65% | 298K | $3.0M | — | September 30, 2026 |
| 17 | Dimensional US Targeted Value ETF | 0.63% | 289K | $2.9M | — | September 30, 2026 |
| 18 | Vanguard Russell 2000 ETF | 0.59% | 271K | $2.7M | +2,539 (+0.9%) | September 30, 2026 |
| 19 | Schwab US Small-Cap ETF™ | 0.52% | 239K | $2.4M | +153 (+0.1%) | September 30, 2026 |
| 20 | Fidelity Extended Market Index | 0.41% | 187K | $1.9M | +71,814 (+62.2%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
CLB insider transactions
latest 19| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2020-05-07 | Jan Willem Sodderland | Buy | $17.07 | 600 | $10,242 |
| 2020-02-03 | Lawrence Bruno | Buy | $34.86 | 3,000 | $104,580 |
| 2020-01-02 | Mark F. Elvig | Sell | $37.93 | 600 | $22,758 |
| 2019-08-13 | Gregory Barry Barnett | Buy | $40.00 | 1,000 | $40,000 |
| 2019-03-11 | Kevin Daniels | Sell | $66.25 | 428 | $28,355 |
| 2018-10-29 | Jan Willem Sodderland | Buy | $85.76 | 200 | $17,152 |
| 2018-08-14 | Kevin Daniels | Sell | $112.63 | 73 | $8,222 |
| 2017-02-01 | Michael Straughen | Buy | $118.65 | 106 | $12,577 |
| 2017-01-30 | Martha Z Carnes | Buy | $115.20 | 200 | $23,040 |
| 2016-02-02 | Jan Willem Sodderland | Buy | $93.90 | 300 | $28,170 |
| 2015-05-12 | Michael C Kearney | Sell | $128.52 | 1,000 | $128,520 |
| 2014-11-17 | Mark F Elvig | Sell | $138.03 | 1,000 | $138,030 |
| 2014-07-28 | Richard L Bergmark | Buy | $147.31 | 7,000 | $1.0M |
| 2014-03-07 | Michael Kearney | Sell | $193.00 | 2,000 | $386,000 |
| 2014-02-14 | Mark Elvig | Sell | $186.64 | 1,500 | $279,960 |
| 2013-10-21 | Monty L Davis | Sell | $197.33 | 5,704 | $1.1M |
| 2013-08-07 | Richard Bergmark | Sell | $149.58 | 20,000 | $3.0M |
| 2013-07-25 | Charles Brigham Miller | Sell | $147.81 | 11,648 | $1.7M |
| 2013-07-25 | Monty L Davis | Sell | $149.12 | 5,948 | $886,966 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
CLB shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns CLB
Institutional investors own 117.3% of Core Laboratories's shares and insiders 1.43%. The largest holder is Ariel Investments, LLC with 30.67% of the shares (14.1M), as of June 30, 2026. Among the top 20 institutions, 14 added shares and 6 reduced their stake in the latest filings. Short interest is 25.43% of the float, or 8.40 days of average trading volume. The share count rose 5.9% since 2014.
Related: CLB analyst forecast, CLB key metrics, CLB dividend history. See the CLB stock overview for the latest quote and news.
CLB ownership FAQ
Who owns the most Core Laboratories stock?
The largest shareholders of Core Laboratories are Ariel Investments, LLC (30.67%), BlackRock Inc (16.26%), Disciplined Growth Investors Inc (6.63%), Earnest Partners LLC (6.41%), State Street Corp (4.74%).
What percentage of Core Laboratories is owned by institutions?
Institutions hold 117.3% of Core Laboratories's shares outstanding; insiders hold 1.43%.
Which funds own Core Laboratories?
The largest fund holders of Core Laboratories are Ariel Fund Investor (14.11%), Ariel Appreciation Investor (3.12%), iShares Russell 2000 ETF (2.65%), Harbor Small Cap Value Instl (2.40%), Vanguard MStar Total Stk Mkt Idx Invest (2.25%).
What is Core Laboratories's short interest?
4.9M shares of Core Laboratories were sold short, 25.43% of the float; at the average daily volume it would take 8.40 days to cover.
Are insiders buying or selling Core Laboratories?
Of the latest 19 reported insider transactions in Core Laboratories (since July 25, 2013), 8 were purchases and 11 were sales.
How many shares of Core Laboratories are outstanding?
Core Laboratories has 45.9M shares outstanding, of which 45.2M are in the public float.