Core Laboratories SVP exercises 250 restricted shares

Core Laboratories executive Mark Damian Tattoli, SVP, General Counsel & Secretary, exercised a restricted share award that delivered 250 shares of Common Stock on May 1, 2026.

Rhea-AI Filing Summary

Core Laboratories executive Mark Damian Tattoli, SVP, General Counsel & Secretary, exercised a restricted share award that delivered 250 shares of Common Stock on May 1, 2026. To cover tax obligations, 97 shares were disposed of at $14.07 per share, leaving 27,513.621 directly held shares.

He also holds shares indirectly, including 1,694.842 shares through a 401(k) plan and 20 shares in a custodial account. The filing notes multiple restricted share grants vesting annually over six years, contingent on continued service.

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	250	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	97	$14.07	$1K
Exercise	Common Stock	250	$0.00	$0.00
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Shares — 1,200 contracts (Direct); Common Stock — 27,610.621 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 exercised: 250 shares Tax-withholding shares: 97 shares at $14.07 Direct holdings after transaction: 27,513.621 shares +2 more

5 metrics

Restricted shares exercised 250 shares Restricted Shares converted into Common Stock on May 1, 2026

Tax-withholding shares 97 shares at $14.07 Shares delivered to satisfy tax liability on May 1, 2026

Direct holdings after transaction 27,513.621 shares Common Stock directly owned following Form 4 transactions

401(k) indirect holdings 1,694.842 shares Common Stock held indirectly via 401(k) plan

Custodial account holdings 20 shares Common Stock held indirectly in custodial account

Key Terms

Restricted Shares, tax-withholding disposition, 401 (k) Plan

3 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.

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

401 (k) Plan financial

"nature_of_ownership": "401 (k) Plan""

FAQ

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

What insider transaction did Core Laboratories (CLB) report for Mark Damian Tattoli?

Core Laboratories reported that executive Mark Damian Tattoli exercised a restricted share award for 250 Common Stock shares. Of these, 97 shares were disposed of to cover tax obligations, with the remaining shares increasing his directly held Core Laboratories position.

How many Core Laboratories (CLB) shares does Mark Damian Tattoli hold after this Form 4?

After the reported transactions, Mark Damian Tattoli directly holds 27,513.621 Core Laboratories Common Stock shares. He also has indirect holdings of 1,694.842 shares in a 401(k) plan and 20 shares in a custodial account, according to the Form 4 filing.

Was the Core Laboratories (CLB) Form 4 transaction a market sale or tax withholding?

The Form 4 shows a tax-withholding disposition of 97 Core Laboratories shares at $14.07 per share. This reflects shares delivered to satisfy tax obligations on a restricted share exercise, rather than an open-market sale initiated for investment reasons.

What does the restricted share exercise mean for Core Laboratories (CLB) executive compensation?

The restricted share exercise indicates part of Mark Damian Tattoli’s equity-based compensation vested and converted into 250 Common Stock shares. Footnotes state multiple restricted share grants vest annually over six years, provided he remains in continuous service with Core Laboratories.

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

The Form 4 lists indirect Core Laboratories holdings of 1,694.842 Common Stock shares in a 401(k) plan and 20 shares in a custodial account. These are reported as indirect ownership, separate from his directly held 27,513.621 Common Stock shares.

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

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Accepted by SEC EDGAR 05/04/2026 - 04:37 PM EDT 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)
05/01/2026

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	05/01/2026		F		97	D	$14.07	27,513.621	D
Common Stock	05/01/2026		M		250	A	$0	27,610.621	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	05/01/2026		M			250	(1)	(1)	Common Stock	250	$0	1,200(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	05/04/2026
	** 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)