As of the latest Form 4 filed May 4, 2026.
What Core Laboratories NV insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Newest filing first — the 16 most recent filings for CLB.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-05-04 | 2026-05-01 | Tattoli Mark Damian SVP, Gen Counsel & Secretary | MExercise | +250.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-04 | 2026-05-01 | Tattoli Mark Damian, SVP, Gen Counsel & Secretary | FTax | −97.00 | $14.07 | $1.36K | No | Form 4 ↗ |
| 2026-04-08 | 2026-04-01 | Murray Katherine Director | MExercise | +8.07K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-01 | ANASTASIO CURT Director | MExercise | +8.07K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-01 | Klingensmith Harvey Robert Director | MExercise | +8.07K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-01 | Temeng Kwaku Director | MExercise | +8.07K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-01 | MARTINOVICH ROBERT F Director | MExercise | +8.07K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-01 | Carnes Martha Z. Director | MExercise | +8.07K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2025-12-02 | 2025-12-01 | Teo Sow Hang CAO & Treasurer | MExercise | +864.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2025-12-02 | 2025-12-01 | Teo Sow Hang, CAO & Treasurer | FTax | −340.00 | $15.39 | $5.23K | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-01 | Teo Sow Hang CAO & Treasurer | MExercise | +175.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-01 | Teo Sow Hang, CAO & Treasurer | FTax | −79.00 | $15.71 | $1.24K | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-01 | Tattoli Mark Damian SVP, Gen Counsel & Secretary | MExercise | +200.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-01 | Tattoli Mark Damian, SVP, Gen Counsel & Secretary | FTax | −79.00 | $15.71 | $1.24K | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-01 | Tattoli Mark Damian, SVP, Gen Counsel & Secretary | MExercise | +250.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-01 | Tattoli Mark Damian, SVP, Gen Counsel & Secretary | FTax | −99.00 | $15.71 | $1.56K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also CLB’s full analysis or the market-wide insider trading feed. The tabs above jump to CLB’s other SEC data.
Source: SEC Form 4 filings for CLB, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
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