(CLB)

Reporting relationship: SVP
Issuer ticker: CLB
Reported as of: 31 Dec 2025
Net transaction value: -$309,395
SEC form: 4
Accepted by SEC: 05 Jan 2026, 15:18:06 UTC
Prior SEC filing: 13 Feb 2025
Next SEC filing: 17 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Mark Tattoli, Attorney-in-Fact

Key filing fact

Gwendolyn Gresham filed Form 4 for Core Laboratories Inc. /DE/ (CLB) on 05 Jan 2026.

Key facts

This page summarizes Gwendolyn Gresham's Form 4 filing for Core Laboratories Inc. /DE/ (CLB).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 05 Jan 2026, 15:18.

Change

Previous filing in this sequence was filed on 13 Feb 2025.
Current net transaction value: -$309,395.

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 0001842114 Primary reporting owner

Gresham Gwendolyn

Relationship: SVP
Address: 6316 WINDFERN ROAD, HOUSTON
Signature: /s/ Mark Tattoli, Attorney-in-Fact
Signature date: 05 Jan 2026

Reported non-derivative transactions

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

CLB transaction

Common Stock

Tax liability

Transaction value: $309,395
Shares: -19,301
Change %: -37%
Price: $16.03
Shares after: 33,226
Date: 31 Dec 2025
Ownership: Direct

CLB transaction

Common Stock

Options Exercise

Transaction value: $0
Shares: +24,952
Change %: +90%
Price: $0.000000
Shares after: 52,527
Date: 31 Dec 2025
Ownership: Direct

Reported derivative securities

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

CLB transaction Derivative

Performance Shares

Options Exercise

Transaction value: $0
Shares: -24,952
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 31 Dec 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 24,952
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

These shares were awarded as restricted performance shares in February 2023, as disclosed in the Reporting Person's Form 4 filing on February 21, 2023. The Company finished in the 68th percentile of return on invested capital among the Bloomberg Peer Group at the conclusion of the performance period on December 31, 2025. Therefore, the performance criteria and requirements for vesting have been satisfied at 116.5% of the target award level, and such number of shares vested on December 31, 2025.