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.

Form 4 Filings
50
most recent
Open-Market Buys
1
code P
Sales
0
code S
Reporting Insiders
25
current holders
CLB — Recent Form 4 Transactions (latest 2026-08-04)
FiledInsiderRole TypeSharesValue
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
CLB — Current Insider Holders
InsiderRole Shares HeldValue
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
How to read Form 4 activity

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.