Core Laboratories insider exercises 250 share award

Core Laboratories executive Mark Damian Tattoli exercised restricted share awards for 250 underlying common shares at $0 on 1 August 2026.

Rhea-AI Filing Summary

Core Laboratories executive Mark Damian Tattoli exercised restricted share awards for 250 underlying common shares at $0 on 1 August 2026. The related restricted shares were canceled and 99 common shares were disposed of at $10.64 per share as payment of exercise price or tax liability. Following these transactions he holds 950 restricted shares directly, plus indirect common stock positions of 20 shares in a custodial account and 1,694.8420 shares in a 401 (k) Plan. These transactions were not reported under a Rule 10b5-1 trading plan.

Insider Trade Summary

250 shares exercised/converted

Exercise 5 txns

Insider Tattoli Mark Damian

Role SVP, Gen Counsel & Secretary

Type	Security	Shares	Price	Value
Exercise	Restricted Shares F1, F2	250	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	99	$10.64	$1K
Exercise	Common Stock	250	$0.00	$0.00
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Shares — 950 contracts (Direct); Common Stock — 27,763.621 shares (Direct); Common Stock — 20 shares (Indirect, Custodial account); Common Stock — 1,694.842 shares (Indirect, 401 (k) Plan)

Footnotes (2)

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.
2. F2. Multiple restricted share grants are included in this total.

Key Figures

Restricted shares converted: 250 shares Shares disposed for obligations: 99 shares at $10.6400 per share Restricted shares remaining: 950 shares +2 more

5 metrics

Restricted shares converted 250 shares Restricted Shares converted into Common Stock on 2026-08-01

Shares disposed for obligations 99 shares at $10.6400 per share Common Stock disposed as payment of exercise price or tax liability on 2026-08-01

Restricted shares remaining 950 shares Direct Restricted Shares held after the reported transactions

Custodial account holdings 20 shares Indirect Common Stock held in a Custodial account following the transactions

401 (k) Plan holdings 1,694.8420 shares Indirect Common Stock held in a 401 (k) Plan after the reported transactions

Key Terms

Restricted Shares, exercise or conversion of derivative security, Custodial account, 401 (k) Plan

4 terms

Restricted Shares financial

"The Restricted Shares vest annually over six years on the anniversary"

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.

exercise or conversion of derivative security financial

"transaction code description Exercise or conversion of derivative security"

Custodial account financial

"nature of ownership Custodial account for 20 indirect Common Stock shares"

A custodial account is an investment or bank account opened and managed by an adult (the custodian) for the benefit of someone who cannot legally control assets, typically a minor. Think of it as a wallet held by a trusted guardian until the beneficiary reaches a legal age: it lets you save and invest on someone’s behalf, affects who makes decisions and who pays taxes, and determines when control of the assets transfers to the beneficiary—details investors watch for tax consequences, ownership rules, and timing of control.

401 (k) Plan financial

"nature of ownership 401 (k) Plan for 1,694.8420 indirect Common Stock shares"

FAQ

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

What insider transactions did Core Laboratories (CLB) executive Mark Damian Tattoli report?

Mark Damian Tattoli exercised restricted share awards for 250 common shares at $0 and disposed of 99 common shares at $10.64 per share as payment of exercise price or tax liability, while updating his reported direct and indirect Core Laboratories holdings.

How many Core Laboratories (CLB) shares did Mark Damian Tattoli acquire and dispose of?

Tattoli acquired 250 shares of Core Laboratories common stock through the exercise of restricted share awards and disposed of 99 common shares at $10.64 per share as payment of exercise price or tax liability on 1 August 2026.

What is Mark Damian Tattoli’s remaining Core Laboratories (CLB) equity position after these transactions?

After the reported activity, Tattoli holds 950 restricted shares directly, plus indirect positions of 20 Core Laboratories common shares in a custodial account and 1,694.8420 common shares in a 401 (k) Plan, as disclosed in the filing.

Were the Core Laboratories (CLB) insider transactions made under a Rule 10b5-1 plan?

The filing indicates the Rule 10b5-1 checkbox was not selected, so these transactions by Mark Damian Tattoli were reported as occurring outside a Rule 10b5-1 trading plan rather than under a pre-arranged automatic program.

What price was used for the Core Laboratories (CLB) share disposition related to the award exercise?

The disposition related to the award exercise involved 99 Core Laboratories common shares at $10.64 per share, recorded as payment of the exercise price or associated tax liability, according to the Form 4 transaction code F description.

How are Mark Damian Tattoli’s indirect Core Laboratories (CLB) holdings structured?

Indirect Core Laboratories holdings for Tattoli include 20 common shares in a Custodial account and 1,694.8420 common shares in a 401 (k) Plan, reflecting retirement and custodial ownership separate from his directly held restricted shares.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 08/04/2026 - 10:27 AM Accepted by SEC EDGAR 08/04/2026 - 10:27 AM 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)
08/01/2026

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	08/01/2026		F		99	D	$10.64	27,664.621	D
Common Stock	08/01/2026		M		250	A	$0	27,763.621	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	08/01/2026		M			250	(1)	(1)	Common Stock	250	$0	950(2)	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.

2. Multiple restricted share grants are included in this total.

	/s/ Mark D. Tattoli	08/04/2026
	** 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)