Disciplined Growth Investors boosts Core Laboratories (CLB) stake to 11.1%

Rhea-AI Filing Summary

Core Laboratories Inc. reported that investment adviser Disciplined Growth Investors, Inc. filed an amended Schedule 13G showing a significant ownership stake. As of 12/31/2025, the adviser beneficially owned 5,166,914 common shares of Core Laboratories, representing 11.1% of the outstanding class.

The firm had sole power to vote 4,668,306 of these shares and sole power to dispose of all 5,166,914 shares, with no shared voting or dispositive power. The filing states the position is held in the ordinary course of business and not for the purpose of changing or influencing control of Core Laboratories.

Insights

Equity Ownership & Governance Analyst

Disciplined Growth Investors reports an 11.1% passive stake in Core Laboratories.

Disciplined Growth Investors, Inc., a Minnesota-based investment adviser, disclosed beneficial ownership of 5,166,914 Core Laboratories common shares, or 11.1% of the class as of 12/31/2025. It holds sole voting power over 4,668,306 shares and sole dispositive power over the full position.

The filing is on a Schedule 13G, which signals a passive investment intent rather than an activist approach. The certifying officer states the shares were acquired and are held in the ordinary course of business, not to change or influence control, and not as part of any control-related group or transaction.

This makes Disciplined Growth Investors a sizeable institutional holder whose actions could affect trading liquidity and voting outcomes, but the passive certification limits expectations of control-related initiatives. Future ownership updates, if any, would typically appear in subsequent Schedule 13D/G amendments or similar disclosures.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 5)

Core Laboratories Inc. /DE/

(Name of Issuer)

Common Shares

(Title of Class of Securities)

21867A105

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 21867A105

1

Names of Reporting Persons

DISCIPLINED GROWTH INVESTORS INC /MN

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

MINNESOTA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 4,668,306.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,166,914.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,166,914.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

11.1 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Core Laboratories Inc. /DE/
(b)	Address of issuer's principal executive offices: 6316 WINDFERN ROAD, 6316 WINDFERN ROAD, HOUSTON, TEXAS, 77040.
Item 2.
(a)	Name of person filing: Disciplined Growth Investors, Inc.
(b)	Address or principal business office or, if none, residence: 150 South Fifth Street Suite 2550 Minneapolis, MN 55402
(c)	Citizenship: Minnesota, USA
(d)	Title of class of securities: Common Shares
(e)	CUSIP No.: 21867A105
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 5,166,914
(b)	Percent of class: 11.1%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 4,668,306
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 5,166,914
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

DISCIPLINED GROWTH INVESTORS INC /MN

Signature:	Peter G. Rieke
Name/Title:	Chief Operating Officer
Date:	02/17/2026

FAQ

What stake does Disciplined Growth Investors hold in Core Laboratories (CLB)?

Disciplined Growth Investors beneficially owns 5,166,914 Core Laboratories common shares, representing 11.1% of the class as of December 31, 2025. This makes the firm a major institutional shareholder with significant voting and dispositive power over a large block of CLB shares.

Is Disciplined Growth Investors an activist or passive investor in Core Laboratories (CLB)?

Disciplined Growth Investors filed on Schedule 13G, indicating a passive investment. The certification states the shares were acquired and held in the ordinary course of business, not for changing or influencing control, and not in connection with any control-related transaction or activist campaign at Core Laboratories.

How many Core Laboratories (CLB) shares can Disciplined Growth Investors vote and dispose of?

Disciplined Growth Investors has sole power to vote or direct the vote of 4,668,306 Core Laboratories shares and sole power to dispose of or direct the disposition of all 5,166,914 shares. It reports no shared voting power and no shared dispositive power over CLB shares.

What percentage of Core Laboratories (CLB) does Disciplined Growth Investors’ 13G/A filing represent?

The amended Schedule 13G reports that Disciplined Growth Investors’ 5,166,914 Core Laboratories common shares equal 11.1% of the outstanding class as of December 31, 2025. Crossing the 5% threshold requires this type of beneficial ownership disclosure under SEC rules.

Why did Disciplined Growth Investors file an Amendment No. 5 Schedule 13G for Core Laboratories (CLB)?

Amendment No. 5 updates Disciplined Growth Investors’ beneficial ownership information in Core Laboratories as of December 31, 2025. The filing refreshes share counts, percentage ownership, and confirms the passive, ordinary-course nature of the investment, consistent with SEC reporting requirements for large holders.

What type of entity is Disciplined Growth Investors in the Core Laboratories (CLB) filing?

Disciplined Growth Investors is identified as an investment adviser under SEC rules. It is organized in Minnesota, USA, and files the Schedule 13G as an adviser that exercises investment and, in part, voting discretion over client accounts holding Core Laboratories common shares.