(CLB)

Role: SVP, Gen Counsel & Secretary
Signature: /s/ Mark D. Tattoli
Issuer symbol: CLB
Transactions as of: 31 Dec 2025
Net transactions value: -$229,389
Form type: 4
Filing time: 05 Jan 2026, 15:18:37 UTC
Previous filing: 02 Oct 2025
Next filing: 17 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Tattoli Mark Damian	SVP, Gen Counsel & Secretary	6316 WINDFERN ROAD, HOUSTON	/s/ Mark D. Tattoli	05 Jan 2026	0001872069

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership
transaction	CLB	Common Stock	Tax liability	$229,389	-14,310	-34%	$16.03	27,361	31 Dec 2025	Direct
transaction	CLB	Common Stock	Options Exercise	$0	+24,952	+149%	$0.000000	41,671	31 Dec 2025	Direct
holding	CLB	Common Stock						20	31 Dec 2025	Custodial account
holding	CLB	Common Stock						1,695	31 Dec 2025	401 (k) Plan

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.