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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1000229	Core Laboratories N V	CLB	Oil & Gas Field Services, Nec (1389)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1282547	M David Demshur	6316 Windfern Road Houston TX 77040	Chief Executive Officer	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Shares	Disposition	2010-07-29	6,812	$75.92	475,150	No	4	S	Direct
Common Shares	Disposition	2010-07-29	56,147	$76.16	419,003	No	4	S	Direct
Common Shares	Disposition	2010-07-29	300	$77.00	418,703	No	4	S	Direct
Common Shares	Disposition	2010-07-30	18,950	$75.73	399,753	No	4	S	Direct
Common Shares	Disposition	2010-07-30	17,791	$76.18	381,962	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Shares	68,530	Indirect	401(k) Plan

Footnotes

This transaction was executed in multiple trades at prices ranging from $75.00 to $75.99. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
This transaction was executed in multiple trades at prices ranging from $76.00 to $76.99. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
On July 8, 2010, the common stock of Core Laboratories N.V. split 2-for-1 for shareholders of record as of June 30, 2010. All numbers and share prices in this Form 4 reflect this stock split.