CLB (Core Laboratories Inc.)
Insider Trading Activity
Every open-market purchase and sale reported by CLB officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-04 | Lawrence Bruno | Chairman and CEO | Buy | — | — |
| 2026-08-04 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2026-08-04 | Sow Hang Teo | CAO & Treasurer | MIXED | — | — |
| 2026-05-04 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2026-04-08 | Katherine Murray | Director | M | — | — |
| 2026-04-07 | CURT ANASTASIO | Director | M | — | — |
| 2026-04-07 | Kwaku Temeng | Director | M | — | — |
| 2026-04-07 | Harvey Robert Klingensmith | Director | M | — | — |
| 2026-04-07 | ROBERT F MARTINOVICH | Director | M | — | — |
| 2026-04-07 | Martha Z. Carnes | Director | M | — | — |
| 2026-02-17 | Sow Hang Teo | CAO & Treasurer | A | — | — |
| 2026-02-17 | Gwendolyn Gresham | SVP | A | — | — |
| 2026-02-17 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | A | — | — |
| 2026-02-17 | Lawrence Bruno | Chairman and CEO | A | — | — |
| 2026-02-17 | Christopher Scott Hill | SVP & CFO | A | — | — |
| 2026-01-05 | Gwendolyn Gresham | SVP | MIXED | — | — |
| 2026-01-05 | Christopher Scott Hill | SVP & CFO | MIXED | — | — |
| 2026-01-05 | Lawrence Bruno | Chairman and CEO | MIXED | — | — |
| 2026-01-05 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2025-12-02 | Sow Hang Teo | CAO & Treasurer | MIXED | — | — |
| 2025-10-02 | Sow Hang Teo | CAO & Treasurer | MIXED | — | — |
| 2025-10-02 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2025-08-05 | Sow Hang Teo | CAO & Treasurer | MIXED | — | — |
| 2025-08-05 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2025-05-05 | Sow Hang Teo | CAO & Treasurer | MIXED | — | — |
| 2025-05-05 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2025-04-02 | CURT ANASTASIO | Director | M | — | — |
| 2025-04-02 | Harvey Robert Klingensmith | Director | M | — | — |
| 2025-04-02 | Katherine Murray | Director | M | — | — |
| 2025-04-02 | Michael Straughen | Director | MIXED | — | — |
| 2025-04-02 | Martha Z. Carnes | Director | M | — | — |
| 2025-04-02 | Kwaku Temeng | Director | M | — | — |
| 2025-02-13 | Sow Hang Teo | CAO & Treasurer | A | — | — |
| 2025-02-13 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | A | — | — |
| 2025-02-13 | Lawrence Bruno | Chairman and CEO | A | — | — |
| 2025-02-13 | Gwendolyn Gresham | SVP | A | — | — |
| 2025-02-13 | Christopher Scott Hill | SVP & CFO | A | — | — |
| 2025-01-03 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2025-01-03 | Lawrence Bruno | Chairman and CEO | MIXED | — | — |
| 2025-01-03 | Christopher Scott Hill | SVP & CFO | MIXED | — | — |
| 2025-01-03 | Gwendolyn Gresham | SVP | MIXED | — | — |
| 2024-12-02 | Sow Hang Teo | CAO & Treasurer | MIXED | — | — |
| 2024-10-03 | Sow Hang Teo | CAO & Treasurer | MIXED | — | — |
| 2024-10-03 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2024-08-05 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2024-08-05 | Sow Hang Teo | CAO & Treasurer | MIXED | — | — |
| 2024-05-02 | Sow Hang Teo | CAO & Treasurer | MIXED | — | — |
| 2024-05-02 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | — | — |
| 2024-04-11 | Sow Hang Teo | CAO & Treasurer | A | — | — |
| 2024-04-02 | Katherine Murray | Director | M | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | 10%+ Owner | 4,640,900 | — |
| — | Chief Executive Officer | 434,374 | — |
| — | Chairman and CEO | 262,438 | — |
| — | VP, Counsel & Secretary | 255,228 | — |
| — | EVP & CFO | 145,788 | — |
| — | SVP & CFO | 142,413 | — |
| — | Director | 119,114 | — |
| — | Chief Operating Officer | 117,730 | — |
| — | Director | 54,397 | — |
| — | SVP | 52,527 | — |
| — | Director | 50,031 | — |
| — | CAO & Treasurer | 42,384 | — |
| — | Director | 41,512 | — |
| — | Director | 33,907 | — |
| — | Director | 33,597 | — |
| — | Director | 29,290 | — |
| — | SVP, Gen Counsel & Secretary | 27,783 | — |
| — | Director | 24,552 | — |
| — | Director | 23,805 | — |
| — | Director | 20,004 | — |
| — | Director | 17,118 | — |
| — | Director | 13,798 | — |
| — | SVP, Gen Counsel & Secretary | 13,687 | — |
| — | CAO & Treasurer | 13,115 | — |
| — | Director | 12,523 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the CLB quote page; the site-wide leaderboard is on the insider transactions hub.