Core Laboratories Inc. /DE/ (CLB) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-05-04

Core Laboratories Inc. /DE/ (CLB) has filed 1 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-05-04. 2 Form 8-K material event filings were reported by CLB in the last 90 days. InsiderAlpha tracks every CLB SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About Core Laboratories Inc. /DE/ (CLB)

SIC classification	Oil & Gas Field Services, NEC (SIC 1389)
SEC CIK	0001958086

90-Day SEC Filing Activity

Form 4 filings (90d)	1
Form 8-K filings (90d)	2
Latest Form 4 filing	2026-05-04

Recent CLB Insider Transactions (Form 4)

Date	Insider	Role	Transaction	Shares	Price	Value	Filing
2026-05-01	Tattoli Mark Damian	SVP, Gen Counsel & Secretary	M — Option exercise	250	$0.00	—	SEC
2026-05-01	Tattoli Mark Damian	SVP, Gen Counsel & Secretary	F — Tax withholding / forfeiture	97	$14.07	$1K	SEC
2026-04-01	Klingensmith Harvey Robert	Insider	M — Option exercise	8.1K	$0.00	—	SEC
2026-04-01	MARTINOVICH ROBERT F	Insider	M — Option exercise	8.1K	$0.00	—	SEC
2026-04-01	Murray Katherine	Insider	M — Option exercise	8.1K	$0.00	—	SEC
2026-04-01	ANASTASIO CURT	Insider	M — Option exercise	8.1K	$0.00	—	SEC
2026-04-01	Carnes Martha Z.	Insider	M — Option exercise	8.1K	$0.00	—	SEC
2026-04-01	Temeng Kwaku	Insider	M — Option exercise	8.1K	$0.00	—	SEC
2025-12-31	Hill Christopher Scott	SVP & CFO	F — Tax withholding / forfeiture	32.2K	$16.03	$515K	SEC
2025-12-31	Hill Christopher Scott	SVP & CFO	M — Option exercise	61.4K	$0.00	—	SEC
2025-12-31	Tattoli Mark Damian	SVP, Gen Counsel & Secretary	M — Option exercise	25.0K	$0.00	—	SEC
2025-12-31	Gresham Gwendolyn	SVP	F — Tax withholding / forfeiture	19.3K	$16.03	$309K	SEC
2025-12-31	Bruno Lawrence	Chairman and CEO	F — Tax withholding / forfeiture	112.7K	$16.03	$1.81M	SEC
2025-12-31	Bruno Lawrence	Chairman and CEO	M — Option exercise	180.7K	$0.00	—	SEC
2025-12-31	Gresham Gwendolyn	SVP	M — Option exercise	25.0K	$0.00	—	SEC

All transactions sourced from SEC EDGAR Form 4 filings for Core Laboratories Inc. /DE/ (CLB). Updated in real time as new filings are submitted to the SEC.

Most-Active CLB Insiders — Last 90 Days

Insider	Form 4 filings	Total transaction value
Tattoli Mark Damian	3	$1K

Recent CLB Form 8-K Material Events

2026-05-13 — Item 5.07 [SEC]
2026-04-29 — Item 2.02, 7.01, 9.01 [SEC]
2026-03-23 — Item 7.01, 9.01 · Earnings · negative [SEC]
Core Laboratories Inc. issued a press release on March 23, 2026 announcing revisions to previously issued earnings guidance for Q1 2026. The company is lowering its forward guidance, indicating weaker-than-expected financial performance for the first quarter.
2026-03-17 — Item 2.02 · Earnings · neutral [SEC]
Core Laboratories filed an amended 8-K/A to correct certain financial information in its original February 4, 2026 earnings release for Q4 and full-year 2025. The amendment addresses reconciliation discrepancies in income tax accounts discovered during preparation of audited fina
2026-03-05 — Item 5.03, 9.01 · Other · neutral [SEC]
Core Laboratories Inc. amended its bylaws on February 27, 2026, lowering the voting threshold for shareholder approval of merger and change-of-control transactions from a 66-2/3% supermajority to a simple 50% plus one majority vote. This change makes it easier for the company to

Recent Insider Filings

2026-05-04 — Tattoli Mark Damian (SVP, Gen Counsel & Secretary)
2026-04-08 — Murray Katherine (Insider)
2026-04-07 — ANASTASIO CURT (Insider)
2026-04-07 — Klingensmith Harvey Robert (Insider)
2026-04-07 — Temeng Kwaku (Insider)

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in CLB insider filings:

P	Open-market purchase by the insider
S	Open-market sale by the insider
A	Grant, award, or other acquisition from the issuer
M	Exercise or conversion of derivative security (e.g. options)
F	Payment of exercise price or tax liability via share withholding
G	Bona-fide gift of securities
D	Disposition to the issuer (e.g. share buyback participation)
J	Other acquisition or disposition
X	Exercise of in-the-money or at-the-money derivative security
C	Conversion of derivative security
V	Transaction voluntarily reported earlier than required

CLB Insider Trading — FAQ

What is the latest insider trade for CLB?: Core Laboratories Inc. /DE/ (CLB) had 1 insider filings in the last 90 days, with the most recent on 2026-05-04. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying CLB stock?: 0 insider purchases of CLB were filed in the last 90 days.
How many insiders are selling CLB stock?: 0 insider sales of CLB were filed in the last 90 days.
Where can I see CLB SEC filings (Form 4, 10-K, 10-Q, 8-K)?: InsiderAlpha aggregates every CLB SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

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