Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
DEMSHUR DAVID M
  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
__X__ Officer (give title below) _____ Other (specify below)
President & CEO
(Last)
(First)
(Middle)
6316 WINDFERN
3. Date of Earliest Transaction (Month/Day/Year)
01/17/2006
(Street)

HOUSTON, TX 77040
4. If Amendment, Date 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
(City)
(State)
(Zip)
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)
Code V Amount (A) or (D) Price
Common Shares 01/17/2006   M   40,000 A $ 0 340,649 D  
Common Shares 01/17/2006   F   14,687 D $ 42.98 325,962 D  
Common Shares               34,265 I 401(k) Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities
(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 of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Performance Shares (1) $ 0 01/17/2006   M     40,000   (2)   (2) Common Shares 40,000 $ 0 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
DEMSHUR DAVID M
6316 WINDFERN
HOUSTON, TX 77040
  X     President & CEO  

Signatures

 /s/ John D. Denson, Attorney-in-fact   01/19/2006
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) Each Performance Share represents a contingent right to acquire one Common Share.
(2) Represents a grant of performance shares which represent the right to receive our Common Shares in the future based on the performance of our Common Shares. None of these awards will vest unless our Common Shares perform as well as or better than the 50th percentile of the return earned by the common stock of the companies comprising the Philadelphia Oil Service Sector Index ("OSX") for the applicable performance period. If our common shares perform as well as or better than the 50th percentile but below the 75th percentile of the companies comprising OSX, then the number of rights eligible to vest would be interpolated between 20% and 100% of the shares granted. If our common shares perform as well as or better than the 75th percentile of the companies comprising the OSX, then 100% of the rights would be eligible to vest. The executive will not receive dividends on or be entitled to vote the underlying Common Shares unless and until they have issued at the end of the vesting period.

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