Core Laboratories counsel converts 700 shares

The restricted-share award vests annually over six years on the grant anniversary, subject to continuous service.

Rhea-AI Filing Summary

Core Laboratories Inc. (CLB) reported that Mark Damian Tattoli, SVP, Gen Counsel & Secretary, had a derivative exercise/conversion involving 700 restricted shares, reported as disposed, and acquired 700 common shares on October 1, 2026. On the same date, 276 common shares were delivered or withheld for payment of exercise price or tax liability; the reported price was $9.76 per share. No Rule 10b5-1 plan is reported.

The restricted shares vest annually over six years on the grant anniversary, subject to continuous service. Reported holdings following the transaction included 250 restricted shares, plus indirect common-stock holdings of 20 shares in a custodial account and 1,695 shares in a 401 (k) Plan.

Insider Trade Summary

700 shares exercised/converted

Exercise 5 txns

Insider Tattoli Mark Damian

Role SVP, Gen Counsel & Secretary

Type	Security	Shares	Price	Value
Exercise	Restricted Shares F1	700	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	276	$9.76	$3K
Exercise	Common Stock	700	$0.00	$0.00
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Shares — 250 contracts (Direct); Common Stock — 28,364.621 shares (Direct); Common Stock — 20 shares (Indirect, Custodial account); Common Stock — 1,694.842 shares (Indirect, 401 (k) Plan)

Footnotes (1)

1. F1. The Restricted Shares vest annually over six years on the anniversary of the grant date in the amount specified in the award agreement, provided the reporting person remains in continuous service on each such vesting date.

Key Figures

Restricted shares in derivative exercise/conversion: 700 shares Common shares acquired: 700 shares Common shares delivered or withheld: 276 shares +4 more

7 metrics

Restricted shares in derivative exercise/conversion 700 shares Reported as disposed on October 1, 2026

Common shares acquired 700 shares October 1, 2026

Common shares delivered or withheld 276 shares For payment of exercise price or tax liability on October 1, 2026

Reported price per share $9.76 per share Associated with the 276 common shares delivered or withheld

Restricted shares following transaction 250 shares Reported direct holdings

Common shares in custodial account 20 shares Reported indirect holdings

Common shares in 401 (k) Plan 1,695 shares Reported indirect holdings

Key Terms

Restricted Shares, derivative security, exercise price or tax liability, 401 (k) Plan

4 terms

Restricted Shares financial

"The Restricted Shares vest annually over six years"

Restricted shares are company stock that cannot be sold or transferred immediately because they are subject to legal or contractual limits, such as a required holding period or performance conditions. They matter to investors because these locked-up shares can affect a company’s available stock for trading, future dilution, and insider incentives—imagine a gift that can’t be cashed until certain conditions are met, which changes when and how much supply can suddenly enter the market.

derivative security financial

"Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

exercise price or tax liability financial

"Payment of exercise price or tax liability by delivering or withholding securities"

401 (k) Plan financial

"401 (k) Plan"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What CLB shares did Mark Damian Tattoli report acquiring or disposing of?

On October 1, 2026, Mark Damian Tattoli reported a derivative exercise/conversion involving 700 restricted shares, reported as disposed, and an acquisition of 700 common shares. He also reported 276 common shares delivered or withheld for payment of exercise price or tax liability at a reported price of $9.76 per share. No Rule 10b5-1 plan is reported.

What are the vesting terms for Mark Damian Tattoli's CLB restricted shares?

The restricted shares vest annually over six years on each anniversary of the grant date, in the amount specified in the award agreement, provided Mark Damian Tattoli remains in continuous service on each vesting date.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/05/2026 - 12:18 PM Accepted by SEC EDGAR 10/05/2026 - 12:18 PM Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Tattoli Mark Damian

(Last) (First) (Middle)

6316 WINDFERN ROAD

(Street)

HOUSTON TEXAS 77040

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Core Laboratories Inc. /DE/ [ 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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

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

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

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

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 Stock	10/01/2026		F		276	D	$9.76	28,088.621	D
Common Stock	10/01/2026		M		700	A	$0	28,364.621	D
Common Stock								20	I	Custodial account
Common Stock								1,694.842	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Shares	$0	10/01/2026		M			700	(1)	(1)	Common Stock	700	$0	250	D

Explanation of Responses:

1. The Restricted Shares vest annually over six years on the anniversary of the grant date in the amount specified in the award agreement, provided the reporting person remains in continuous service on each such vesting date.

	/s/ Mark D. Tattoli	10/05/2026
	** 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.
* Form 4: SEC 1474 (03-26)