Core Laboratories
CLB · NYSE
$10.06−$0.09 (−0.89%)TodayMarket closed ·
Prev close $10.15
Who owns CLB
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 74.6% of CLB’s shares.
- Ariel Investments, LLC21.0%
- The Vanguard Group, Inc.11.4%
- BlackRock Institutional Trust Company, N.A.11.2%
- Fred Alger Management, LLC8.4%
- Next 6 largest institutions22.5%
- All other shareholders25.4%
| Holder | Shares | % of shares |
|---|---|---|
| Ariel Investments, LLC | 9.70M | 21.05% |
| The Vanguard Group, Inc. | 5.25M | 11.39% |
| BlackRock Institutional Trust Company, N.A. | 5.18M | 11.24% |
| Fred Alger Management, LLC | 3.85M | 8.36% |
| EARNEST Partners, LLC | 3.57M | 7.75% |
| Boston Trust Walden Company | 1.97M | 4.27% |
| State Street Global Advisors Ireland Limited | 1.36M | 2.96% |
| State Street Global Advisors (US) | 1.26M | 2.72% |
| Weatherbie Capital, LLC | 1.23M | 2.67% |
| Van Eck Associates Corporation | 995.14K | 2.16% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Ariel Fund | 3.57M | 7.73% |
| iShares Core S&P Small-Cap ETF | 3.39M | 7.36% |
| MFS International Intrinsic Value Portfolio | 1.49M | 3.23% |
| Vanguard Total Stock Market Index Fund | 1.46M | 3.18% |
| Ariel Appreciation Fund | 1.44M | 3.13% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders bought $53.90K (1 trade) of CLB on the open market, with no sales.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Teo Sow Hang | Option exercise | 250 | — |
| Teo Sow Hang | Option exercise | 250 | — |
| Teo Sow Hang | Tax withholding | 99 | $966 |
| Tattoli Mark Damian | Option exercise | 700 | — |
| Tattoli Mark Damian | Option exercise | 700 | — |
| Tattoli Mark Damian | Tax withholding | 276 | $2.69K |
| Teo Sow Hang | Option exercise | 200 | — |
| Teo Sow Hang | Option exercise | 240 | — |
| Teo Sow Hang | Option exercise | 200 | — |
| Teo Sow Hang | Tax withholding | 90 | $958 |
Short interest
Settled Sep 30, 2026
- Shares short
- 4.87M
- Days to cover
- 6.81
- % of shares outstanding
- 10.56%
- Average daily volume
- 714.90K
- Change since last report
- +11.1%
Information on this page is provided for informational purposes only and is not a recommendation to buy, sell or hold any security. Investing involves risk, including possible loss of principal. Market data is delayed at least 15 minutes and is provided without warranty. Analyst ratings, price targets and company data come from third-party sources. Past performance does not guarantee future results.