CLB · Insider Trading
Core Laboratories Inc.
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-05 | Sow Hang Teo | CAO & Treasurer | MIXED | +151 | −$966 |
| 2026-10-05 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +424 | −$2.69K |
| 2026-08-04 | Lawrence Bruno | Chairman and CEO | Buy | +5,000 | +$53.90K |
| 2026-08-04 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +151 | −$1.05K |
| 2026-08-04 | Sow Hang Teo | CAO & Treasurer | MIXED | +242 | −$2.11K |
| 2026-05-04 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +153 | −$1.36K |
| 2026-04-08 | Katherine Murray | Director | M | +8,069 | — |
| 2026-04-07 | Curt Anastasio | Director | M | +8,069 | — |
| 2026-04-07 | Kwaku Temeng | Director | M | +8,069 | — |
| 2026-04-07 | Harvey Robert Klingensmith | Director | M | +8,069 | — |
| 2026-04-07 | Robert F Martinovich | Director | M | +8,069 | — |
| 2026-04-07 | Martha Z. Carnes | Director | M | +8,069 | — |
| 2026-02-17 | Sow Hang Teo | CAO & Treasurer | A | +7,526 deriv. | — |
| 2026-02-17 | Gwendolyn Gresham | SVP | A | +33,490 deriv. | — |
| 2026-02-17 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | A | +33,490 deriv. | — |
| 2026-02-17 | Lawrence Bruno | Chairman and CEO | A | +204,340 deriv. | — |
| 2026-02-17 | Christopher Scott Hill | SVP & CFO | A | — | — |
| 2026-01-05 | Gwendolyn Gresham | SVP | MIXED | +5,651 | −$309.40K |
| 2026-01-05 | Christopher Scott Hill | SVP & CFO | MIXED | +29,265 | −$515.40K |
| 2026-01-05 | Lawrence Bruno | Chairman and CEO | MIXED | +68,041 | −$1.81M |
| 2026-01-05 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +10,642 | −$229.39K |
| 2025-12-02 | Sow Hang Teo | CAO & Treasurer | MIXED | +524 | −$5.23K |
| 2025-10-02 | Sow Hang Teo | CAO & Treasurer | MIXED | +151 | −$1.25K |
| 2025-10-02 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +424 | −$3.47K |
| 2025-08-05 | Sow Hang Teo | CAO & Treasurer | MIXED | +242 | −$2.08K |
| 2025-08-05 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +151 | −$1.04K |
| 2025-05-05 | Sow Hang Teo | CAO & Treasurer | MIXED | +96 | −$923 |
| 2025-05-05 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +272 | −$2.08K |
| 2025-04-02 | Curt Anastasio | Director | M | +9,317 | — |
| 2025-04-02 | Harvey Robert Klingensmith | Director | M | +9,317 | — |
| 2025-04-02 | Katherine Murray | Director | M | +9,317 | — |
| 2025-04-02 | Michael Straughen | Director | MIXED | +4,683 | −$69.42K |
| 2025-04-02 | Martha Z. Carnes | Director | M | +9,317 | — |
| 2025-04-02 | Kwaku Temeng | Director | M | +9,317 | — |
| 2025-02-13 | Sow Hang Teo | CAO & Treasurer | A | +7,692 deriv. | — |
| 2025-02-13 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | A | +32,912 deriv. | — |
| 2025-02-13 | Lawrence Bruno | Chairman and CEO | A | +202,764 deriv. | — |
| 2025-02-13 | Gwendolyn Gresham | SVP | A | +32,912 deriv. | — |
| 2025-02-13 | Christopher Scott Hill | SVP & CFO | A | +68,800 deriv. | — |
| 2025-01-03 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +4,576 | −$87.03K |
| 2025-01-03 | Lawrence Bruno | Chairman and CEO | MIXED | +26,194 | −$750.91K |
| 2025-01-03 | Christopher Scott Hill | SVP & CFO | MIXED | +8,888 | −$254.79K |
| 2025-01-03 | Gwendolyn Gresham | SVP | MIXED | +3,615 | −$103.67K |
| 2024-12-02 | Sow Hang Teo | CAO & Treasurer | MIXED | +349 | −$4.64K |
| 2024-10-03 | Sow Hang Teo | CAO & Treasurer | MIXED | +151 | −$1.90K |
| 2024-10-03 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +424 | −$5.30K |
| 2024-08-05 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +223 | −$3.42K |
| 2024-08-05 | Sow Hang Teo | CAO & Treasurer | MIXED | +302 | −$5.07K |
| 2024-05-02 | Sow Hang Teo | CAO & Treasurer | MIXED | +96 | −$1.24K |
| 2024-05-02 | Mark Damian Tattoli | SVP, Gen Counsel & Secretary | MIXED | +272 | −$2.80K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Lawrence Bruno | Chairman and CEO | 262,438 | $2.68M |
| Christopher Scott Hill | SVP & CFO | 142,413 | $1.46M |
| Martha Z. Carnes | Director | 54,397 | $555.94K |
| Gwendolyn Gresham | SVP | 52,527 | $536.83K |
| Harvey Robert Klingensmith | Director | 50,031 | $511.32K |
| Kwaku Temeng | Director | 33,597 | $343.36K |
| Mark Damian Tattoli | SVP, Gen Counsel & Secretary | 30,059 | $307.21K |
| Katherine Murray | Director | 29,290 | $299.34K |
| Michael Straughen | Director | 24,552 | $250.92K |
| Curt Anastasio | Director | 23,805 | $243.29K |
| Sow Hang Teo | CAO & Treasurer | 8,818 | $90.12K |
| Robert F Martinovich | Director | 8,069 | $82.47K |
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.
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.