Sec Form 4/A Filing - Tattoli Mark Damian @ CORE LABORATORIES N V - 2021-07-02

FORM 4/A 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 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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1. Name and Address of Reporting Person Tattoli Mark Damian 2. Issuer Name and Ticker or Trading Symbol CORE LABORATORIES N V [ CLB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) SVP, Gen Counsel & Secretary (Last) (First) (Middle) 6316 WINDFERN ROAD 3. Date of Earliest Transaction (MM/DD/YY) 07/02/2021 (Street) HOUSTON, TX77040 4. If Amendment, Date Original Filed (MM/DD/YY) 10/05/2021 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 08/01/2021 M V 120 A $ 0 3,480.539 D Common Shares 08/01/2021 F V 29 D $ 33.36 3,451.539 D Common Shares ( 1 ) 08/24/2021 J V 1.082 A $ 0 3,452.621 D Common Shares 10/01/2021 M 700 A $ 0 4,152.621 D Common Shares 10/01/2021 F 169 D $ 29.05 3,983.621 D Common Shares 20 I Custodial account Common Shares 1,694.841 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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Restricted Shares ( 2 ) 10/01/2021 M 700 ( 2 ) ( 2 ) Common Shares 700 $ 0 8,000 D Restricted Shares ( 3 ) 08/01/2021 A V 1,500 ( 3 ) ( 3 ) Common Shares 1,500 $ 0 8,700 D Restricted Shares ( 4 ) 08/01/2021 M V 120 ( 4 ) ( 4 ) Common Shares 120 $ 0 7,200 D Restricted Shares ( 5 ) 07/02/2021 A V 7,320 ( 5 ) ( 5 ) Common Shares 7,320 $ 0 7,320 D Performance Shares ( 6 ) 07/02/2021 A V 6,900 ( 6 ) ( 6 ) Common Shares 6,900 $ 0 6,900 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Tattoli Mark Damian 6316 WINDFERN ROAD HOUSTON, TX77040 SVP, Gen Counsel & Secretary Signatures /s/ Mark Tattoli 10/06/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Shares acquired through a broker-sponsored dividend reinvestment plan. ( 2 )Represents the time-based vesting of 700 shares from a grant of 4,200 Restricted Shares awarded to Mr. Tattoli on October 1, 2020. The Restricted Shares vest annually over six years on the anniversary of the grant date in the amount of 1/6th of the grant total, provided the reporting person remains in continuous service on each vesting date. ( 3 )The Restricted Shares granted will vest annually over six years on the anniversary of the grant date in the amount of 1/6th of the grant total, provided the reporting person remains in continuous service on each vesting date. ( 4 )Represents the time-based vesting of 120 shares from a grant of 720 Restricted Shares awarded to Mr. Tattoli on August 1, 2018. The Restricted Shares vest annually over six years on the anniversary of the grant date in the amount of 1/6th of the grant total, provided the reporting person remains in continuous service on each vesting date. ( 5 )Mr. Tattoli has 6 grants of Restricted Shares outstanding as of July 2, 2021, and of those the following shares remain unvested as of such date: 110 shares from the grant on March 1, 2016, 480 shares from the grant on December 1, 2017, 480 shares from the grant on August 1, 2018, 800 shares from the grant on May 1, 2019, 1,250 shares from the grant on May 1, 2020, and 4,200 shares from the grant on October 1, 2020. The Restricted Shares granted will vest annually over six years on the anniversary of the grant date in the amount of 1/6th of the grant total, provided the reporting person remains in continuous service on each vesting date. ( 6 )Assuming a recipient's continued employment (or death or disability while employed) and the satisfaction of certain performance goals is achieved, this award would vest at the end of a three-year performance period that began on January 1, 2021 and ends on December 31, 2023 (the "Performance Period"). At the end of the Performance Period, 100% of the award will vest if the Company is in the top 75th percentile of Return On Invested Capital of the Bloomberg Peer Group as measured and determined by the Compensation Committee at the end of the Performance Period.

Remarks: The original Form 4 filed on October 5, 2021 is being amended by this Form 4 amendment to correct the number of Common Shares directly held by Mr. Tattoli as of the date of this amended filing. The original Form 4 failed to include (i) the acquisition of 1.082 shares pursuant to a broker-sponsored dividend reinvestment plan and (ii) the time-based vesting of 120 shares on August 1, 2021 in connection with a grant of Restricted Shares on August 1, 2018. The number of unvested Restricted Shares held by Mr. Tattoli as of July 2, 2021 subject to time-based vesting was underreported by 120 shares due to an administrative error. Mr. Tattoli held 7,320 Re stricted Shares as of July 2, 2021, not 7,200 Restricted Shares as reported in the original Form 4. No other changes have been made to the original Form 4.

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).

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