Core Laboratories Inc. (CLB) shareholders
CLBNYSEOil & Gas Field Services, NECFiscal year ends December 31
Financials through Q3 FY2026, quarter ended Sep 30, 2026Last filing: 10-Q on Oct 30, 2026Score 11/3010% above fair value
$9.11+0.10 (+1.11%)
Close on Nov 13, 2026Market cap $417.45MP/E 26.8Yield 0.44%
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
100.0%
53M of 46M shares
Institutional holders
186
32 new, 31 sold out
Net institutional buying
2M
In Q2 2026
Insider trades, 12 months
1 buys · 0 sales
Net bought $53.90K
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Ariel Investments, LLC | 14,074,945 | 30.50% | 13G (passive) amendment | Jun 30, 2026 |
| BlackRock, Inc. | 3,811,390 | 8.30% | 13G (passive) amendment | Jul 31, 2026 |
| Earnest Partners LLC | 3,221,043 | 6.90% | 13G (passive) amendment | Dec 31, 2025 |
| Disciplined Growth Investors Inc /Mn | 3,042,177 | 6.60% | 13G (passive) amendment | Jun 30, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of CLB | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Ariel Investments, LLC | 14,074,945 | 30.72% | $163.97M | +904,557 | 1.63% |
| BlackRock, Inc. | 7,460,118 | 16.28% | $86.91M | +251,615 | 0.00% |
| Disciplined Growth Investors Inc /Mn | 3,042,177 | 6.64% | $35.44M | −1,894,938 | 0.60% |
| Earnest Partners LLC | 2,941,004 | 6.42% | $34.26M | −114,992 | 0.12% |
| State Street Corp | 2,176,480 | 4.75% | $25.36M | +115,943 | 0.00% |
| CWA Asset Management Group, LLC | 1,755,085 | 3.83% | $20.45M | +14,084 | 0.62% |
| Vanguard Capital Management LLC | 1,590,521 | 3.47% | $18.53M | −29,342 | 0.00% |
| Dimensional Fund Advisors LP | 1,548,203 | 3.38% | $18.03M | +195,874 | 0.00% |
| Schroder Investment Management Group | 1,543,638 | 3.37% | $16.86M | New | 0.01% |
| Vanguard Portfolio Management LLC | 1,275,421 | 2.78% | $14.86M | +20,585 | 0.00% |
| Geode Capital Management, LLC | 1,193,824 | 2.61% | $13.91M | +55,866 | 0.00% |
| Gendell Jeffrey L | 1,090,973 | 2.38% | $12.71M | +442,513 | 0.11% |
| Heartland Advisors Inc | 1,058,311 | 2.31% | $12.33M | +908,311 | 0.55% |
| Goldman Sachs Group Inc | 751,643 | 1.64% | $8.76M | −97,258 | 0.00% |
| Evergreen Capital Management LLC | 669,508 | 1.46% | $7.80M | New | 0.14% |
| Morgan Stanley | 656,146 | 1.43% | $7.64M | +209,364 | 0.00% |
| Northern Trust Corp | 608,202 | 1.33% | $7.09M | +42,916 | 0.00% |
| Charles Schwab Investment Management Inc | 565,065 | 1.23% | $6.58M | −121,885 | 0.00% |
| T. Rowe Price Investment Management, Inc. | 485,032 | 1.06% | $5.65M | −618,863 | 0.00% |
| UBS Group AG | 461,777 | 1.01% | $5.38M | +30,124 | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 186 | 53M | 100.0% | 32 / 57 | 69 / 31 | 7M | 5M |
| Q1 2026 | 190 | 51M | 100.0% | 24 / 60 | 59 / 18 | 6M | 3M |
| Q4 2025 | 188 | 51M | 100.0% | 30 / 51 | 78 / 29 | 4M | 4M |
| Q3 2025 | 190 | 51M | 100.0% | 28 / 65 | 72 / 28 | 3M | 4M |
| Q2 2025 | 191 | 52M | 100.0% | 28 / 68 | 60 / 31 | 5M | 4M |
| Q1 2025 | 195 | 51M | 100.0% | 22 / 55 | 77 / 33 | 3M | 3M |
| Q4 2024 | 208 | 51M | 100.0% | 38 / 58 | 72 / 17 | 2M | 2M |
| Q3 2024 | 190 | 51M | 100.0% | 29 / 61 | 72 / 28 | 12M | 4M |
| Q2 2024 | 193 | 52M | 100.0% | 28 / 72 | 59 / 29 | 6M | 5M |
| Q1 2024 | 196 | 51M | 100.0% | 33 / 75 | 54 / 23 | 6M | 5M |
| Q4 2023 | 186 | 49M | 100.0% | 28 / 55 | 71 / 19 | 3M | 2M |
| Q3 2023 | 178 | 48M | 100.0% | 24 / 55 | 65 / 8 | 3M | 3M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
220 funds held CLB in Q2 2026, 41% of their shares through ETFs. Each fund counts once per quarter, from its quarter-end report.
| Fund | Shares | % of CLB | Value | % of fund | As of |
|---|---|---|---|---|---|
| Ariel Fund | 6,474,663 | 14.13% | $75.43M | 2.60% | Jun 30, 2026 |
| iShares Core S&P Small-Cap ETF | 2,774,502 | 6.05% | $32.32M | 0.03% | Jun 30, 2026 |
| Ariel Appreciation Fund | 1,429,620 | 3.12% | $16.66M | 1.73% | Jun 30, 2026 |
| iShares Russell 2000 ETF | 1,213,219 | 2.65% | $14.13M | 0.02% | Jun 30, 2026 |
| Harbor Small Cap Value Fund | 1,113,698 | 2.43% | $11.85M | 0.47% | Jul 31, 2026 |
| Vanguard Total Stock Market Index Fund | 1,030,900 | 2.25% | $12.01M | 0.00% | Jun 30, 2026 |
| Heartland Value Fund | 901,721 | 1.97% | $10.51M | 0.90% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 529,062 | 1.15% | $6.16M | 0.01% | Jun 30, 2026 |
| Fidelity Small Cap Index Fund | 509,572 | 1.11% | $5.42M | 0.02% | Jul 31, 2026 |
| Vanguard Energy Index Fund | 443,992 | 0.97% | $6.07M | 0.05% | May 31, 2026 |
| iShares Russell 2000 Value ETF | 441,865 | 0.96% | $5.15M | 0.04% | Jun 30, 2026 |
| Vanguard Explorer Value Fund | 428,559 | 0.94% | $5.86M | 0.47% | May 31, 2026 |
| Columbia Small Cap Value Discovery Fund | 425,000 | 0.93% | $4.52M | 0.18% | Jul 31, 2026 |
| State Street(R) SPDR(R) Portfolio S&P 600(TM) Small Cap ETF | 419,632 | 0.92% | $4.89M | 0.03% | Jun 30, 2026 |
| iShares S&P Small-Cap 600 Value ETF | 399,505 | 0.87% | $4.65M | 0.06% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Lawrence Bruno | Chairman and CEO, Director | 262,438 | 0.57% | Aug 4, 2026 |
| Sow Hang Teo | CAO & Treasurer | 8,917 | 0.02% | Oct 5, 2026 |
| Mark Damian Tattoli | SVP, Gen Counsel & Secretary | 30,079 | 0.07% | Oct 5, 2026 |
| Gwendolyn Gresham | SVP | 33,226 | 0.07% | Feb 17, 2026 |
| Christopher Scott Hill | SVP & CFO | 110,261 | 0.24% | Feb 17, 2026 |
| Katherine Murray | Director | 29,290 | 0.06% | Apr 8, 2026 |
| Curt Anastasio | Director | 23,805 | 0.05% | Apr 7, 2026 |
| Robert F. Martinovich | Director | 8,069 | 0.02% | Apr 7, 2026 |
| Martha Z. Carnes | Director | 54,397 | 0.12% | Apr 7, 2026 |
| Harvey Robert Klingensmith | Director | 50,031 | 0.11% | Apr 7, 2026 |
| Kwaku Temeng | Director | 33,597 | 0.07% | Apr 7, 2026 |
| Michael Straughen | Director | 24,552 | 0.05% | Apr 2, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Oct 1, 2026 | Option exercise | +700 | – | – | 28,365 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Oct 1, 2026 | Tax withholding | −276 | $9.76 | $2.69K | 28,089 |
| Sow Hang Teo CAO & Treasurer | Oct 1, 2026 | Option exercise | +250 | – | – | 8,917 |
| Sow Hang Teo CAO & Treasurer | Oct 1, 2026 | Tax withholding | −99 | $9.76 | $966 | 8,818 |
| Sow Hang Teo CAO & Treasurer | Aug 1, 2026 | Option exercise | +200 | – | – | 8,625 |
| Sow Hang Teo CAO & Treasurer | Aug 1, 2026 | Tax withholding | −90 | $10.64 | $958 | 8,535 |
| Sow Hang Teo CAO & Treasurer | Aug 1, 2026 | Tax withholding | −108 | $10.64 | $1.15K | 8,667 |
| Sow Hang Teo CAO & Treasurer | Aug 1, 2026 | Option exercise | +240 | – | – | 8,775 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Aug 1, 2026 | Option exercise | +250 | – | – | 27,764 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Aug 1, 2026 | Tax withholding | −99 | $10.64 | $1.05K | 27,665 |
| Lawrence Bruno Chairman and CEO, Director | Jul 31, 2026 | Buy | +5,000 | $10.78 | $53.90K | 262,438 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | May 1, 2026 | Option exercise | +250 | – | – | 27,611 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | May 1, 2026 | Tax withholding | −97 | $14.07 | $1.36K | 27,514 |
| Katherine Murray Director | Apr 1, 2026 | Option exercise | +8,069 | – | – | 29,290 |
| Kwaku Temeng Director | Apr 1, 2026 | Option exercise | +8,069 | – | – | 33,597 |
| Curt Anastasio Director | Apr 1, 2026 | Option exercise | +8,069 | – | – | 23,805 |
| Robert F. Martinovich Director | Apr 1, 2026 | Option exercise | +8,069 | – | – | 8,069 |
| Martha Z. Carnes Director | Apr 1, 2026 | Option exercise | +8,069 | – | – | 54,397 |
| Harvey Robert Klingensmith Director | Apr 1, 2026 | Option exercise | +8,069 | – | – | 50,031 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Dec 31, 2025 | Tax withholding | −14,310 | $16.03 | $229.39K | 27,361 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Dec 31, 2025 | Option exercise | +24,952 | – | – | 41,671 |
| Christopher Scott Hill SVP & CFO | Dec 31, 2025 | Tax withholding | −32,152 | $16.03 | $515.40K | 110,202 |
| Christopher Scott Hill SVP & CFO | Dec 31, 2025 | Option exercise | +61,417 | – | – | 142,354 |
| Lawrence Bruno Chairman and CEO, Director | Dec 31, 2025 | Tax withholding | −112,681 | $16.03 | $1.81M | 257,438 |
| Lawrence Bruno Chairman and CEO, Director | Dec 31, 2025 | Option exercise | +180,722 | – | – | 370,119 |
| Gwendolyn Gresham SVP | Dec 31, 2025 | Tax withholding | −19,301 | $16.03 | $309.40K | 33,226 |
| Gwendolyn Gresham SVP | Dec 31, 2025 | Option exercise | +24,952 | – | – | 52,527 |
| Sow Hang Teo CAO & Treasurer | Dec 1, 2025 | Option exercise | +864 | – | – | 8,765 |
| Sow Hang Teo CAO & Treasurer | Dec 1, 2025 | Tax withholding | −340 | $15.39 | $5.23K | 8,425 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Oct 1, 2025 | Option exercise | +700 | – | – | 16,995 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Oct 1, 2025 | Tax withholding | −276 | $12.58 | $3.47K | 16,719 |
| Sow Hang Teo CAO & Treasurer | Oct 1, 2025 | Option exercise | +250 | – | – | 8,000 |
| Sow Hang Teo CAO & Treasurer | Oct 1, 2025 | Tax withholding | −99 | $12.58 | $1.25K | 7,901 |
| Sow Hang Teo CAO & Treasurer | Aug 1, 2025 | Option exercise | +200 | – | – | 7,840 |
| Sow Hang Teo CAO & Treasurer | Aug 1, 2025 | Option exercise | +240 | – | – | 7,748 |
| Sow Hang Teo CAO & Treasurer | Aug 1, 2025 | Tax withholding | −108 | $10.53 | $1.14K | 7,640 |
| Sow Hang Teo CAO & Treasurer | Aug 1, 2025 | Tax withholding | −90 | $10.53 | $948 | 7,750 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Aug 1, 2025 | Option exercise | +250 | – | – | 16,394 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Aug 1, 2025 | Tax withholding | −99 | $10.53 | $1.04K | 16,295 |
| Sow Hang Teo CAO & Treasurer | May 1, 2025 | Tax withholding | −79 | $11.68 | $923 | 7,508 |
| Sow Hang Teo CAO & Treasurer | May 1, 2025 | Option exercise | +175 | – | – | 7,587 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | May 1, 2025 | Option exercise | +250 | – | – | 16,243 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | May 1, 2025 | Tax withholding | −79 | $11.68 | $923 | 15,993 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | May 1, 2025 | Option exercise | +200 | – | – | 16,072 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | May 1, 2025 | Tax withholding | −99 | $11.68 | $1.16K | 16,144 |
| Curt Anastasio Director | Apr 1, 2025 | Option exercise | +9,317 | – | – | 15,736 |
| Harvey Robert Klingensmith Director | Apr 1, 2025 | Option exercise | +9,317 | – | – | 41,962 |
| Martha Z. Carnes Director | Apr 1, 2025 | Option exercise | +9,317 | – | – | 46,328 |
| Michael Straughen Director | Apr 1, 2025 | Tax withholding | −4,634 | $14.98 | $69.42K | 24,552 |
| Michael Straughen Director | Apr 1, 2025 | Option exercise | +9,317 | – | – | 29,186 |
| Katherine Murray Director | Apr 1, 2025 | Option exercise | +9,317 | – | – | 21,221 |
| Kwaku Temeng Director | Apr 1, 2025 | Option exercise | +9,317 | – | – | 25,528 |
| Christopher Scott Hill SVP & CFO | Dec 31, 2024 | Option exercise | +23,607 | – | – | 95,656 |
| Christopher Scott Hill SVP & CFO | Dec 31, 2024 | Tax withholding | −14,719 | $17.31 | $254.79K | 80,937 |
| Lawrence Bruno Chairman and CEO, Director | Dec 31, 2024 | Tax withholding | −43,380 | $17.31 | $750.91K | 189,397 |
| Lawrence Bruno Chairman and CEO, Director | Dec 31, 2024 | Option exercise | +69,574 | – | – | 232,777 |
| Gwendolyn Gresham SVP | Dec 31, 2024 | Tax withholding | −5,989 | $17.31 | $103.67K | 27,575 |
| Gwendolyn Gresham SVP | Dec 31, 2024 | Option exercise | +9,604 | – | – | 33,564 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Dec 31, 2024 | Tax withholding | −5,028 | $17.31 | $87.03K | 15,872 |
| Mark Damian Tattoli SVP, Gen Counsel & Secretary | Dec 31, 2024 | Option exercise | +9,604 | – | – | 20,900 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Short interest
Shares sold short and not yet bought back, as of Oct 30, 2026 (FINRA, reported twice a month)
Short % of float
10.97%
5M shares short
Days to cover
6.8
At 1M shares a day
Change since last report
+0.8%
From 5M shares
Short volume, 20 days
44.0%
Of volume reported to FINRA
Shares sold short, last 12 months
Short sale volume counts trades marked short on any given day, including market-maker hedging, so it runs far higher than the share of Core Laboratories's stock actually held short. Settlement fails (shares not delivered on time) peaked at 8,509 shares on Oct 5, 2026 over the last 90 days.
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