Holder evidence
50
SEC ownership of Core Laboratories Inc. /DE/
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001958086.
Lead holder
ARIEL INVESTMENTS, LLC
13D/G signal
ARIEL INVESTMENTS, LLC
Latest evidence
01 Apr 2026
- CIK
- 0001958086
- Symbol
- CLB on NYSE
- Location
- Houston, TX
- SEC evidence mix
- 13F, 13D/G, and 3/4/5
- Lead holder
- ARIEL INVESTMENTS, LLC
- Latest large-stake holder
- ARIEL INVESTMENTS, LLC
- Latest evidence date
- 01 Apr 2026
Issuer identity
Ownership snapshot
Ownership snapshot
Top shareholders of Core Laboratories Inc. /DE/ (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Lead holder
ARIEL INVESTMENTS, LLC
13D/G signal
ARIEL INVESTMENTS, LLC
Evidence rows
50
Latest as of
01 Apr 2026
13F
13D/G
3/4/5
Lead comparable stake: 29%
13D/G row: ARIEL INVESTMENTS, LLC
Showing 1-8 of 50 holder rows.
Rank 1 holder
ARIEL INVESTMENTS, LLC
13F
13D/G
- Ownership
- 29%
- Position
- $221.13M
Rank 2 holder
BlackRock, Inc.
13F
13D/G
- Ownership
- 16%
- Position
- $121.03M
Rank 3 holder
DISCIPLINED GROWTH INVESTORS INC /MN
13F
13D/G
- Ownership
- 11%
- Position
- $82.89M
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| ARIEL INVESTMENTS, LLC |
13F
13D/G
Company
|
29%
from 13D/G
|
$221,130,814
13,170,388 shares
|
— | 31 Mar 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
16%
from 13D/G
|
$121,030,761
7,208,503 shares
|
— | 31 Mar 2026 |
| DISCIPLINED GROWTH INVESTORS INC /MN |
13F
13D/G
Company
|
11%
from 13D/G
|
$82,894,161
4,937,115 shares
|
— | 31 Mar 2026 |
| EARNEST PARTNERS LLC |
13D/G
13F
Company
|
6.9%
|
$60,813,292
3,221,043 shares
|
$0 | 31 Dec 2025 |
| Martha Z. Carnes |
3/4/5
Director
|
0.12%
|
$913,320
54,397 shares
|
— | 01 Apr 2026 |
| Harvey Robert Klingensmith |
3/4/5
Director
|
0.11%
|
$840,015
50,031 shares
|
— | 01 Apr 2026 |
| Kwaku Temeng |
3/4/5
Director
|
0.07%
|
$564,090
33,597 shares
|
— | 01 Apr 2026 |
| Katherine Murray |
3/4/5
Director
|
0.06%
|
$491,776
29,290 shares
|
— | 01 Apr 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 31 May 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-13 of 13 reporting-owner rows connected to Core Laboratories Inc. /DE/. Open a relationship link for the CIK-to-CIK filing trail.
Rows
13
Lead holder
Lawrence Bruno
Net 12M change
$0
Latest report
01 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Lawrence Bruno | Chairman and CEO, Director | $6,295,724 | Mixed | 12 Feb 2026 | ||
| Martha Z. Carnes | Director | $913,320 | Median | 01 Apr 2026 | ||
| Gwendolyn Gresham | Svp | $893,484 | Mixed | 12 Feb 2026 | ||
| Harvey Robert Klingensmith | Director | $840,015 | Median | 01 Apr 2026 | ||
| Kwaku Temeng | Director | $564,090 | Median | 01 Apr 2026 | ||
| Mark D. Tattoli | SVP, Gen Counsel & Secretary | $492,373 | Median | 01 May 2026 | ||
| Katherine Murray | Director | $491,776 | Median | 01 Apr 2026 | ||
| Michael Straughen | Director | $437,206 | Mixed | 01 Apr 2025 | ||
| Curt Anastasio | Director | $399,683 | Median | 01 Apr 2026 | ||
| Kevin Daniels | CAO & Treasurer | $231,611 | Mixed | 15 Feb 2024 | ||
| Robert F. Martinovich | Director | $135,477 | Median | 01 Apr 2026 | ||
| Sow Hang Teo | CAO & Treasurer | $134,021 | Mixed | 12 Feb 2026 | ||
| Christopher Scott Hill | Svp & Cfo | $1,113 | Mixed | 12 Feb 2026 |
Recent insider transactions for Core Laboratories Inc. /DE/
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Reported value | Reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Mark D. Tattoli | CLB | Common Stock | Options Exercise | 0.91% | 250 | 27,611 | 01 May 2026 | Direct | ||
| Mark D. Tattoli | CLB | Common Stock | Tax liability | -0.35% | -97 | 27,514 | 01 May 2026 | Direct | ||
| Mark D. Tattoli | CLB | Restricted Shares | Options Exercise | -17.2% | -250 | 1,200 | 01 May 2026 | Direct | ||
| Katherine Murray | CLB | Common Stock | Options Exercise | 38% | 8,069 | 29,290 | 01 Apr 2026 | Direct | ||
| Katherine Murray | CLB | Restricted Shares | Options Exercise | -100% | -8,069 | 0 | 01 Apr 2026 | Direct | ||
| Katherine Murray | CLB | Restricted Shares | Award | 7,895 | 7,895 | 01 Apr 2026 | Direct | |||
| Curt Anastasio | CLB | Common Stock | Options Exercise | 51.3% | 8,069 | 23,805 | 01 Apr 2026 | Direct | ||
| Curt Anastasio | CLB | Restricted Shares | Options Exercise | -100% | -8,069 | 0 | 01 Apr 2026 | Direct | ||
| Curt Anastasio | CLB | Restricted Shares | Award | 7,895 | 7,895 | 01 Apr 2026 | Direct | |||
| Harvey Robert Klingensmith | CLB | Common Stock | Options Exercise | 19.2% | 8,069 | 50,031 | 01 Apr 2026 | Direct | ||
| Harvey Robert Klingensmith | CLB | Restricted Shares | Options Exercise | -100% | -8,069 | 0 | 01 Apr 2026 | Direct | ||
| Harvey Robert Klingensmith | CLB | Restricted Shares | Award | 7,895 | 7,895 | 01 Apr 2026 | Direct | |||
| Kwaku Temeng | CLB | Common Stock | Options Exercise | 31.6% | 8,069 | 33,597 | 01 Apr 2026 | Direct | ||
| Kwaku Temeng | CLB | Restricted Shares | Options Exercise | -100% | -8,069 | 0 | 01 Apr 2026 | Direct | ||
| Kwaku Temeng | CLB | Restricted Shares | Award | 7,895 | 7,895 | 01 Apr 2026 | Direct | |||
| Robert F. Martinovich | CLB | Common Stock | Options Exercise | 8,069 | 8,069 | 01 Apr 2026 | Direct | |||
| Robert F. Martinovich | CLB | Restricted Shares | Options Exercise | -100% | -8,069 | 0 | 01 Apr 2026 | Direct | ||
| Robert F. Martinovich | CLB | Restricted Shares | Award | 7,895 | 7,895 | 01 Apr 2026 | Direct | |||
| Martha Z. Carnes | CLB | Common Stock | Options Exercise | 17.4% | 8,069 | 54,397 | 01 Apr 2026 | Direct | ||
| Martha Z. Carnes | CLB | Restricted Shares | Options Exercise | -100% | -8,069 | 0 | 01 Apr 2026 | Direct | ||
| Martha Z. Carnes | CLB | Restricted Shares | Award | 7,895 | 7,895 | 01 Apr 2026 | Direct | |||
| Mark D. Tattoli | CLB | Performance Shares | Award | 33,490 | 33,490 | 12 Feb 2026 | Direct | |||
| Gwendolyn Gresham | CLB | Performance Shares | Award | 33,490 | 33,490 | 12 Feb 2026 | Direct | |||
| Christopher Scott Hill | CLB | Performance Shares | Award | 70,008 | 70,008 | 12 Feb 2026 | Direct | |||
| Lawrence Bruno | CLB | Performance Shares | Award | 204,340 | 204,340 | 12 Feb 2026 | Direct | |||
| Sow Hang Teo | CLB | Performance Shares | Award | 7,526 | 7,526 | 12 Feb 2026 | Direct | |||
| Mark D. Tattoli | CLB | Common Stock | Options Exercise | 149.2% | 24,952 | 41,671 | 31 Dec 2025 | Direct | ||
| Mark D. Tattoli | CLB | Common Stock | Tax liability | -34.3% | -14,310 | 27,361 | 31 Dec 2025 | Direct | ||
| Mark D. Tattoli | CLB | Performance Shares | Options Exercise | -100% | -24,952 | 0 | 31 Dec 2025 | Direct | ||
| Gwendolyn Gresham | CLB | Common Stock | Options Exercise | 90.5% | 24,952 | 52,527 | 31 Dec 2025 | Direct | ||
| Gwendolyn Gresham | CLB | Common Stock | Tax liability | -36.7% | -19,301 | 33,226 | 31 Dec 2025 | Direct | ||
| Gwendolyn Gresham | CLB | Performance Shares | Options Exercise | -100% | -24,952 | 0 | 31 Dec 2025 | Direct | ||
| Christopher Scott Hill | CLB | Common Stock | Options Exercise | 75.9% | 61,417 | 142,354 | 31 Dec 2025 | Direct | ||
| Christopher Scott Hill | CLB | Common Stock | Tax liability | -22.6% | -32,152 | 110,202 | 31 Dec 2025 | Direct | ||
| Christopher Scott Hill | CLB | Performance Shares | Options Exercise | -100% | -61,417 | 0 | 31 Dec 2025 | Direct | ||
| Lawrence Bruno | CLB | Common Stock | Options Exercise | 95.4% | 180,722 | 370,119 | 31 Dec 2025 | Direct | ||
| Lawrence Bruno | CLB | Common Stock | Tax liability | -30.4% | -112,681 | 257,438 | 31 Dec 2025 | Direct | ||
| Lawrence Bruno | CLB | Performance Shares | Options Exercise | -100% | -180,722 | 0 | 31 Dec 2025 | Direct | ||
| Sow Hang Teo | CLB | Common Stock | Options Exercise | 10.9% | 864 | 8,765 | 01 Dec 2025 | Direct | ||
| Sow Hang Teo | CLB | Common Stock | Tax liability | -3.88% | -340 | 8,425 | 01 Dec 2025 | Direct | ||
| Sow Hang Teo | CLB | Restricted Shares | Options Exercise | -11.4% | -864 | 6,690 | 01 Dec 2025 | Direct | ||
| Mark D. Tattoli | CLB | Common Stock | Options Exercise | 4.3% | 700 | 16,995 | 01 Oct 2025 | Direct | ||
| Mark D. Tattoli | CLB | Common Stock | Tax liability | -1.62% | -276 | 16,719 | 01 Oct 2025 | Direct | ||
| Mark D. Tattoli | CLB | Restricted Shares | Options Exercise | -32.6% | -700 | 1,450 | 01 Oct 2025 | Direct | ||
| Sow Hang Teo | CLB | Common Stock | Options Exercise | 3.23% | 250 | 8,000 | 01 Oct 2025 | Direct | ||
| Sow Hang Teo | CLB | Common Stock | Tax liability | -1.24% | -99 | 7,901 | 01 Oct 2025 | Direct | ||
| Sow Hang Teo | CLB | Restricted Shares | Options Exercise | -3.2% | -250 | 7,554 | 01 Oct 2025 | Direct | ||
| Mark D. Tattoli | CLB | Common Stock | Options Exercise | 1.55% | 250 | 16,394 | 01 Aug 2025 | Direct | ||
| Mark D. Tattoli | CLB | Common Stock | Tax liability | -0.6% | -99 | 16,295 | 01 Aug 2025 | Direct | ||
| Mark D. Tattoli | CLB | Restricted Shares | Options Exercise | -10.4% | -250 | 2,150 | 01 Aug 2025 | Direct |
* indicates a reported price that failed the local validity check.