Core Laboratories Inc.
US ˙ NYSE ˙ US21867A1051

SecurityCLB / Core Laboratories Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership50,603 shares
Latest Disclosed Value $ 849,624
Renaissance Technologies Llc reports 72.41% decrease in ownership of CLB / Core Laboratories Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 50,603 shares of Core Laboratories Inc. (US:CLB) valued at $849,624 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 183,400 shares of Core Laboratories Inc.. This represents a change in shares of -72.41% during the quarter. The current value of the position is $654,297 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.

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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)
2026-05-14 2026-03-31 13F CORE LABORATORIES COM 21867A105 50,603 -132,797 -72.41 850 -71.11 0.0013
2026-02-12 2025-12-31 13F CORE LABORATORIES COM 21867A105 183,400 149,219 436.56 2,940 596.45 0.0046
2025-11-13 2025-09-30 13F CORE LABORATORIES COM 21867A105 34,181 34,181 422 0.0006
2025-02-13 2024-12-31 13F CORE LABORATORIES COM 21867A105 0 -27,600 -100.00 0 -100.00
2024-11-13 2024-09-30 13F CORE LABORATORIES COM 21867A105 27,600 27,600 511 0.0008
2024-08-09 2024-06-30 13F CORE LABORATORIES COM 21867A105 0 -46,300 -100.00 0 0.0000
2024-05-13 2024-03-31 13F CORE LABORATORIES COM 21867A105 46,300 46,300 1 0.0012
2023-05-12 2023-03-31 13F CORE LABORATORIES N V COM N22717107 0 -17,000 -100.00 0 0.0000
2023-02-13 2022-12-31 13F CORE LABORATORIES N V COM N22717107 17,000 17,000 0 0.0005
2022-08-12 2022-06-30 13F CORE LABORATORIES N V COM N22717107 0 -138,100 -100.00 0 -100.00
2022-05-13 2022-03-31 13F CORE LABORATORIES N V COM N22717107 138,100 41,833 43.46 4,368 103.35 0.0051
2022-02-11 2021-12-31 13F CORE LABORATORIES N V COM N22717107 96,267 96,267 2,148 0.0027
2021-08-13 2021-06-30 13F CORE LABORATORIES N V COM N22717107 0 -23,289 -100.00 0 -100.00
2021-05-13 2021-03-31 13F CORE LABORATORIES N V COM N22717107 23,289 -58,113 -71.39 670 -68.95 0.0008
2021-02-10 2020-12-31 13F CORE LABORATORIES N V COM N22717107 81,402 -54,691 -40.19 2,158 3.90 0.0023
2020-11-13 2020-09-30 13F CORE LABORATORIES N V COM N22717107 136,093 -198,355 -59.31 2,077 -69.44 0.0021
2020-08-13 2020-06-30 13F CORE LABORATORIES N V COM N22717107 334,448 -315,552 -48.55 6,796 1.12 0.0059
2020-05-14 2020-03-31 13F CORE LABORATORIES N V COM N22717107 650,000 650,000 94.35 6,721 -1.10 0.0065
2019-08-12 2019-06-30 13F CORE LABORATORIES N V COM N22717107 0 -250,700 -100.00 0 -100.00
2019-05-14 2019-03-31 13F CORE LABORATORIES N V COM N22717107 250,700 -186,600 -42.67 17,281 -33.76 0.0157
2019-02-12 2018-12-31 13F CORE LABORATORIES N V COM N22717107 437,300 274,600 168.78 26,089 38.43 0.0286
2018-11-13 2018-09-30 13F CORE LABORATORIES N V COM N22717107 162,700 -121,400 -42.73 18,846 -47.44 0.0194
2018-08-13 2018-06-30 13F/A-1 CORE LABORATORIES N V COM N22717107 284,100 61,800 27.80 35,856 49.05 0.0391
2018-08-13 2018-06-30 13F CORE LABORATORIES N V COM N22717107 222,300 24,057
2018-05-14 2018-03-31 13F CORE LABORATORIES N V COM N22717107 222,300 152,100 216.67 24,057 212.83 0.0263
2018-02-13 2017-12-31 13F CORE LABORATORIES N V COM N22717107 70,200 70,200 -68.42 7,690 -68.03 0.0085
2017-11-13 2017-09-30 13F CORE LABORATORIES N V COM N22717107 0 -116,200 -100.00 0 -100.00
2017-08-11 2017-06-30 13F CORE LABORATORIES N V COM N22717107 116,200 -55,900 -32.48 11,768 -40.81 0.0150
2017-05-12 2017-03-31 13F CORE LABORATORIES N V COM N22717107 172,100 172,100 48.11 19,881 68.94 0.0278
2017-02-13 2016-12-31 13F CORE LABORATORIES N V COM N22717107 0 -221,900 -100.00 0 -100.00
2016-11-14 2016-09-30 13F CORE LABORATORIES N V COM N22717107 221,900 -19,400 -8.04 24,926 -16.62 0.0441
2016-08-12 2016-06-30 13F CORE LABORATORIES N V COM N22717107 241,300 241,300 8.74 29,895 19.94 0.0569
2016-02-11 2015-12-31 13F CORE LABORATORIES N V COM N22717107 0 -106,600 -100.00 0 -100.00
2015-11-12 2015-09-30 13F CORE LABORATORIES N V COM N22717107 106,600 -149,540 -58.38 10,639 -63.58 0.0254
2015-08-14 2015-06-30 13F CORE LABORATORIES N V COM N22717107 256,140 -215,360 -45.68 29,210 -40.71 0.0665
2015-05-13 2015-03-31 13F CORE LABORATORIES N V COM N22717107 471,500 325,500 222.95 49,267 180.40 0.1049
2015-02-13 2014-12-31 13F CORE LABORATORIES N V COM N22717107 146,000 57,000 64.04 17,570 34.89 0.0424
2014-11-12 2014-09-30 13F CORE LABORATORIES N V COM N22717107 89,000 -82,800 -48.20 13,025 -54.62 0.0357
2014-08-13 2014-06-30 13F CORE LABORATORIES N V COM N22717107 171,800 108,342 170.73 28,701 127.91 0.0669
2014-05-14 2014-03-31 13F CORE LABORATORIES N V COM N22717107 63,458 -85,842 -57.50 12,593 -55.83 0.0302
2014-02-14 2013-12-31 13F CORE LABORATORIES N V COM N22717107 149,300 -73,200 -32.90 28,509 -24.28 0.0683
2013-11-13 2013-09-30 13F CORE LABORATORIES N V COM N22717107 222,500 5,000 2.30 37,649 14.14 0.0913
2013-08-12 2013-06-30 13F CORE LABORATORIES N V COM N22717107 217,500 217,500 32,986 0.0865
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.