SEC FORM 4

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Perna Joseph R

(Last)

(First)

(Middle)

6 BROOKSIDE DRIVE

(Street)

TITUSVILLE

08560

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
CORE LABORATORIES N V [ CLB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
05/01/2006

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Shares	05/01/2006		M		884	A	$18.375	16,884	D
Common Shares	05/01/2006		M		9,116	A	$18.38	26,000	D
Common Shares	05/01/2006		M		10,000	A	$13.063	36,000	D
Common Shares	05/01/2006		M		10,000	A	$19.375	46,000	D
Common Shares	05/01/2006		M		10,000	A	$16.1	56,000	D
Common Shares	05/01/2006		M		10,000	A	$10.26	66,000	D
Common Shares	05/01/2006		M		10,000	A	$8.84	76,000	D
Common Shares	05/01/2006		M		10,000	A	$23	86,000	D
Common Shares	05/01/2006		M		10,000	A	$25	96,000	D
Common Shares	05/01/2006		F		21,273	D	$63	74,727	D
Common Shares								35,644	I	401(K) Plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Option to Acquire Shares	$18.375	05/01/2006		M			884	02/11/1999	02/11/2008	Common Shares	884	$0	0	D
Option to Acquire Shares	$18.38	05/01/2006		M			9,116	02/11/1999	02/11/2008	Common Shares	9,116	$0	0	D
Option to Acquire Shares	$13.063	05/01/2006		M			10,000	04/07/2000	04/07/2009	Common Shares	10,000	$0	0	D
Option to Acquire Shares	$19.375	05/01/2006		M			10,000	02/23/2001	02/23/2010	Common Shares	10,000	$0	0	D
Option to Acquire Shares	$16.1	05/01/2006		M			10,000	04/03/2002	04/03/2011	Common Shares	10,000	$0	0	D
Option to Acquire Shares	$10.26	05/01/2006		M			10,000	09/26/2002	09/26/2011	Common Shares	10,000	$0	0	D
Option to Acquire Shares	$8.84	05/01/2006		M			10,000	03/13/2004	03/13/2013	Common Shares	10,000	$0	0	D
Option to Acquire Shares	$23	05/01/2006		M			10,000	12/20/2005	12/20/2014	Common Shares	10,000	$0	0	D
Option to Acquire Shares	$25	05/01/2006		M			10,000	03/23/2006	03/23/2015	Common Shares	10,000	$0	0	D

Explanation of Responses:

	/s/ John D. Denson, Attorney-in-Fact	05/03/2006
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.