(CLB)

Reporting relationship: SVP, Gen Counsel & Secretary
Issuer ticker: CLB
Reported as of: 01 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 05 Oct 2026, 12:18:10 UTC
Prior SEC filing: 04 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Mark D. Tattoli

Filing notes and source

Key filing fact

Mark D. Tattoli filed Form 4 for Core Laboratories Inc. /DE/ (CLB) on 05 Oct 2026.

Key facts

This page summarizes Mark D. Tattoli's Form 4 filing for Core Laboratories Inc. /DE/ (CLB).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 05 Oct 2026, 12:18.

Change

Previous filing in this sequence was filed on 04 Aug 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001872069 Primary reporting owner

Tattoli Mark Damian

Relationship: SVP, Gen Counsel & Secretary
Address: 6316 WINDFERN ROAD, HOUSTON
Signature: /s/ Mark D. Tattoli
Signature date: 05 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CLB transaction

Common Stock

Tax liability

Transaction value
Shares: -276
Change %: -0.97%
Price: $9.76^*
Shares after: 28,089
Date: 01 Oct 2026
Ownership: Direct

CLB transaction

Common Stock

Options Exercise

Transaction value
Shares: +700
Change %: +2.5%
Price: $0.000000^*
Shares after: 28,365
Date: 01 Oct 2026
Ownership: Direct

CLB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 20
Date: 01 Oct 2026
Ownership: Custodial account

CLB holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 1,695
Date: 01 Oct 2026
Ownership: 401 (k) Plan

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CLB transaction Derivative

Restricted Shares

Options Exercise

Transaction value
Shares: -700
Change %: -74%
Price: $0.000000^*
Shares after: 250
Date: 01 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 700
Exercise price: $0.000000
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The Restricted Shares vest annually over six years on the anniversary of the grant date in the amount specified in the award agreement, provided the reporting person remains in continuous service on each such vesting date.