Core Laboratories Inc.
US ˙ NYSE ˙ US21867A1051

SecurityCLB / Core Laboratories Inc.
InstitutionAssetmark, Inc
Latest Disclosed Ownership808 shares
Latest Disclosed Value $ 13,567
Assetmark, Inc reports 3.12% decrease in ownership of CLB / Core Laboratories Inc.

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 808 shares of Core Laboratories Inc. (US:CLB) valued at $13,566 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 834 shares of Core Laboratories Inc.. This represents a change in shares of -3.12% during the quarter. The current value of the position is $10,795 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-06 2026-03-31 13F CORE LABORATORIES COM 21867A105 808 -26 -3.12 14 0.00 0.0000
2026-01-23 2025-12-31 13F CORE LABORATORIES COM 21867A105 834 -397 -32.25 13 -13.33 0.0000
2025-11-06 2025-09-30 13F CORE LABORATORIES COM 21867A105 1,231 -6,299 -83.65 15 -82.56 0.0000
2025-08-04 2025-06-30 13F CORE LABORATORIES COM 21867A105 7,530 4,643 160.82 87 100.00 0.0002
2025-05-06 2025-03-31 13F CORE LABORATORIES COM 21867A105 2,887 1,387 92.47 43 72.00 0.0001
2025-02-06 2024-12-31 13F CORE LABORATORIES COM 21867A105 1,500 1,500 26 0.0001
2022-08-03 2022-06-30 13F CORE LABORATORIES N V COM COM N22717107 0 -3 -100.00 0 0.0000
2022-05-13 2022-03-31 13F CORE LABORATORIES N V COM COM N22717107 3 3 0 0.0000
2020-05-12 2020-03-31 13F CORE LABORATORIES N V COM COM N22717107 0 -32 -100.00 0 -100.00
2020-02-11 2019-12-31 13F CORE LABORATORIES N V COM COM N22717107 32 0 0.00 1 0.00 0.0000
2019-11-13 2019-09-30 13F CORE LABORATORIES N V COM COM N22717107 32 0 0.00 1 -50.00 0.0000
2019-08-14 2019-06-30 13F CORE LABORATORIES N V COM COM N22717107 32 0 0.00 2 0.00 0.0000
2019-05-14 2019-03-31 13F CORE LABORATORIES N V COM COM N22717107 32 -8 -20.00 2 0.00 0.0000
2019-02-13 2018-12-31 13F CORE LABORATORIES N V COM COM N22717107 40 0 0.00 2 -60.00 0.0000
2018-11-13 2018-09-30 13F CORE LABORATORIES N V COM COM N22717107 40 -2 -4.76 5 0.00 0.0000
2018-08-01 2018-06-30 13F CORE LABORATORIES N V COM COM N22717107 42 -116 -73.42 5 -70.59 0.0000
2018-05-16 2018-03-31 13F CORE LABORATORIES N V COM COM N22717107 158 -91 -36.55 17 -37.04 0.0002
2018-02-13 2017-12-31 13F CORE LABORATORIES N V COM COM N22717107 249 -209 -45.63 27 -40.00 0.0003
2017-11-08 2017-09-30 13F CORE LABORATORIES N V COM COM N22717107 458 52 12.81 45 9.76 0.0005
2017-08-14 2017-06-30 13F CORE LABORATORIES N V COM COM N22717107 406 25 6.56 41 -6.82 0.0005
2017-09-15 2017-03-31 13F/A-1 CORE LABORATORIES N V COM COM N22717107 381 0 0.00 44 -4.35 0.0006
2017-05-08 2017-03-31 13F CORE LABORATORIES N V COM COM N22717107 381 0 44
2017-09-15 2016-12-31 13F/A-1 CORE LABORATORIES N V COM COM N22717107 381 0 0.00 46 6.98 0.0007
2017-02-14 2016-12-31 13F CORE LABORATORIES N V COM COM N22717107 381 0 46
2017-09-14 2016-09-30 13F/A-1 CORE LABORATORIES N V COM COM N22717107 381 -164 -30.09 43 -36.76 0.0007
2016-11-04 2016-09-30 13F CORE LABORATORIES N V COM COM N22717107 381 -164 43
2017-09-14 2016-06-30 13F/A-1 CORE LABORATORIES N V COM COM N22717107 545 330 153.49 68 183.33 0.0011
2016-08-08 2016-06-30 13F CORE LABORATORIES N V COM COM N22717107 545 330 68
2017-09-14 2016-03-31 13F/A-1 CORE LABORATORIES N V COM COM N22717107 215 159 283.93 24 300.00 0.0004
2016-05-13 2016-03-31 13F CORE LABORATORIES N V COM COM N22717107 215 159 24
2017-09-14 2015-12-31 13F/A-1 CORE LABORATORIES N V COM COM N22717107 56 37 194.74 6 200.00 0.0001
2016-02-12 2015-12-31 13F CORE LABORATORIES N V COM COM N22717107 56 37 6
2016-01-05 2015-09-30 13F/A-1 CORE LABORATORIES N V COM COM N22717107 19 19 2 0.0000
2015-11-10 2015-09-30 13F CORE LABORATORIES N V COM COM N22717107 19 2
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.