(CLB)

Role: SVP
Signature: /s/ Mark Tattoli, Attorney-in-Fact
Issuer symbol: CLB
Transactions as of: 31 Dec 2025
Net transactions value: -$309,395
Form type: 4
Filing time: 05 Jan 2026, 15:18:06 UTC
Previous filing: 13 Feb 2025
Next filing: 17 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Gresham Gwendolyn	SVP	6316 WINDFERN ROAD, HOUSTON	/s/ Mark Tattoli, Attorney-in-Fact	05 Jan 2026	0001842114

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CLB	Common Stock	Tax liability	$309,395	-19,301	-37%	$16.03	33,226	31 Dec 2025	Direct
transaction	CLB	Common Stock	Options Exercise	$0	+24,952	+90%	$0.000000	52,527	31 Dec 2025	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	CLB	Performance Shares	Options Exercise	$0	-24,952	-100%	$0.000000	0	31 Dec 2025	Common Stock	24,952	$0.000000	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
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.

Content

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.