Disciplined Growth Investors (CLB) reports 6.6% Core Laboratories stake on Schedule 13G/A

Rhea-AI Filing Summary

Disciplined Growth Investors, Inc. reported its beneficial ownership of common shares of Core Laboratories Inc. as of 06/30/2026. The firm beneficially owns 3,042,177 common shares, representing 6.6% of the class. It has sole voting power over 2,961,959 shares and sole dispositive power over all 3,042,177 shares, with no shared voting or dispositive power indicated. This reflects a significant institutional stake held and controlled solely by Disciplined Growth Investors, Inc.

Key Figures

Beneficially owned shares: 3,042,177 shares Percent of class: 6.6% Sole voting power: 2,961,959 shares +2 more

5 metrics

Beneficially owned shares 3,042,177 shares Common shares of Core Laboratories Inc. beneficially owned by Disciplined Growth Investors, Inc.

Percent of class 6.6% Portion of Core Laboratories Inc. common shares beneficially owned

Sole voting power 2,961,959 shares Shares over which Disciplined Growth Investors, Inc. has sole voting power

Sole dispositive power 3,042,177 shares Shares over which Disciplined Growth Investors, Inc. has sole dispositive power

Citizenship or organization Minnesota, USA Citizenship or place of organization of Disciplined Growth Investors, Inc.

Key Terms

beneficially owned, sole voting power, sole dispositive power, percent of class

4 terms

beneficially owned financial

"Ownership (a) | Amount beneficially owned: 3,042,177"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power financial

"Sole power to vote or to direct the vote: 2,961,959"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole power to dispose or to direct the disposition of: 3,042,177"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

percent of class financial

"(b) | Percent of class: 6.6%"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

FAQ

What percentage of Core Laboratories (CLB) does Disciplined Growth Investors own?

Disciplined Growth Investors, Inc. beneficially owns 6.6% of Core Laboratories Inc.'s common shares, representing a sizable institutional position disclosed on a Schedule 13G/A amendment.

How many Core Laboratories (CLB) shares are held by Disciplined Growth Investors?

Disciplined Growth Investors, Inc. reported beneficial ownership of 3,042,177 Core Laboratories common shares, according to the Schedule 13G/A, indicating a large institutional stake in the company.

What voting power does Disciplined Growth Investors have in Core Laboratories (CLB)?

Disciplined Growth Investors, Inc. has sole voting power over 2,961,959 Core Laboratories common shares and no shared voting power, concentrating control of those votes with the firm.

What dispositive power does Disciplined Growth Investors report over Core Laboratories (CLB) shares?

Disciplined Growth Investors, Inc. reports sole dispositive power over 3,042,177 Core Laboratories shares and no shared dispositive power, meaning it alone directs how these shares may be sold or transferred.

Who signed the Schedule 13G/A for Core Laboratories (CLB) on behalf of Disciplined Growth Investors?

The Schedule 13G/A was signed by Peter G. Rieke, Chief Operating & Compliance Officer of Disciplined Growth Investors, Inc., dated 08/14/2026.

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Available on EDGAR 08/14/2026 - 03:40 PM Accepted by SEC EDGAR 08/14/2026 - 03:39 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 7)

Core Laboratories Inc. /DE/

(Name of Issuer)

Common Shares

(Title of Class of Securities)

21867A105

(CUSIP Number)

06/30/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 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 2,961,959.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,042,177.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,042,177.00

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)

6.6 %

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: 3,042,177
(b)	Percent of class: 6.6%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2,961,959
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 3,042,177
	(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 & Compliance Officer
Date:	08/14/2026