Core Laboratories Inc.
US ˙ NYSE ˙ US21867A1051

SecurityCLB / Core Laboratories Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership565,286 shares
Latest Disclosed Value $ 9,491,151
Northern Trust Corp reports 4.01% increase in ownership of CLB / Core Laboratories Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 565,286 shares of Core Laboratories Inc. (US:CLB) valued at $9,491,152 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 543,493 shares of Core Laboratories Inc.. This represents a change in shares of 4.01% during the quarter. The current value of the position is $7,320,454 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 565,286 21,793 4.01 9,491 8.94 0.0003
2026-02-17 2025-12-31 13F CORE LABORATORIES COM 21867A105 543,493 -34,240 -5.93 8,712 22.02 0.0011
2025-11-14 2025-09-30 13F CORE LABORATORIES COM 21867A105 577,733 -30,626 -5.03 7,141 1.88 0.0009
2025-08-13 2025-06-30 13F CORE LABORATORIES COM 21867A105 608,359 77,374 14.57 7,008 -11.95 0.0010
2025-05-13 2025-03-31 13F CORE LABORATORIES COM 21867A105 530,985 -46,767 -8.09 7,959 -20.41 0.0012
2025-02-14 2024-12-31 13F CORE LABORATORIES COM 21867A105 577,752 78,173 15.65 10,001 8.03 0.0014
2024-11-13 2024-09-30 13F CORE LABORATORIES COM 21867A105 499,579 -515 -0.10 9,257 -8.76 0.0015
2024-08-14 2024-06-30 13F CORE LABORATORIES COM 21867A105 500,094 -7,171 -1.41 10,147 17.11 0.0017
2024-05-14 2024-03-31 13F CORE LABORATORIES COM 21867A105 507,265 12,929 2.62 8,664 -0.74 0.0015
2024-02-13 2023-12-31 13F CORE LABORATORIES COM 21867A105 494,336 -44,795 -8.31 8,730 -32.56 0.0016
2023-11-13 2023-09-30 13F CORE LABORATORIES COM 21867A105 539,131 3,339 0.62 12,945 3.91 0.0025
2023-08-11 2023-06-30 13F CORE LABORATORIES COM 21867A105 535,792 322,210 150.86 12,457 164.54 0.0024
2023-05-15 2023-03-31 13F CORE LABORATORIES N V COM N22717107 213,582 10,274 5.05 4,709 14.27 0.0009
2023-02-13 2022-12-31 13F CORE LABORATORIES N V COM N22717107 203,308 11,392 5.94 4,121 59.23 0.0009
2022-11-14 2022-09-30 13F CORE LABORATORIES N V COM N22717107 191,916 963 0.50 2,588 -31.57 0.0006
2022-08-12 2022-06-30 13F CORE LABORATORIES N V COM N22717107 190,953 23,688 14.16 3,782 -28.52 0.0008
2022-05-13 2022-03-31 13F CORE LABORATORIES N V COM N22717107 167,265 -699 -0.42 5,291 41.17 0.0009
2022-02-08 2021-12-31 13F CORE LABORATORIES N V COM N22717107 167,964 -4,730 -2.74 3,748 -21.80 0.0006
2021-11-15 2021-09-30 13F CORE LABORATORIES N V COM N22717107 172,694 7,487 4.53 4,793 -25.51 0.0008
2021-08-13 2021-06-30 13F CORE LABORATORIES N V COM N22717107 165,207 1,139 0.69 6,434 36.23 0.0011
2021-05-12 2021-03-31 13F CORE LABORATORIES N V COM N22717107 164,068 27,278 19.94 4,723 30.22 0.0009
2021-02-11 2020-12-31 13F CORE LABORATORIES N V COM N22717107 136,790 -13,401 -8.92 3,627 58.32 0.0007
2020-11-16 2020-09-30 13F CORE LABORATORIES N V COM N22717107 150,191 -60,955 -28.87 2,291 -46.61 0.0005
2020-08-14 2020-06-30 13F CORE LABORATORIES N V COM N22717107 211,146 -84,719 -28.63 4,291 40.27 0.0010
2020-05-14 2020-03-31 13F CORE LABORATORIES N V COM N22717107 295,865 -19,359 -6.14 3,059 -74.24 0.0009
2020-02-14 2019-12-31 13F CORE LABORATORIES N V COM N22717107 315,224 -51,235 -13.98 11,875 -30.49 0.0027
2019-11-13 2019-09-30 13F CORE LABORATORIES N V COM N22717107 366,459 33,004 9.90 17,085 -2.00 0.0041
2019-08-13 2019-06-30 13F CORE LABORATORIES N V COM N22717107 333,455 -95,563 -22.27 17,433 -41.05 0.0041
2019-05-13 2019-03-31 13F CORE LABORATORIES N V COM N22717107 429,018 -56,894 -11.71 29,573 2.01 0.0073
2019-02-12 2018-12-31 13F CORE LABORATORIES N V COM N22717107 485,912 -11,291 -2.27 28,989 -49.66 0.0081
2018-11-14 2018-09-30 13F CORE LABORATORIES N V COM N22717107 497,203 13,196 2.73 57,591 -5.72 0.0141
2018-09-18 2018-06-30 13F/A-1 CORE LABORATORIES N V COM N22717107 484,007 9,341 1.97 61,086 18.92 0.0155
2018-08-14 2018-06-30 13F CORE LABORATORIES N V COM N22717107 486,889 12,223 61,450
2018-05-09 2018-03-31 13F CORE LABORATORIES N V COM N22717107 474,666 11,777 2.54 51,368 1.30 0.0134
2018-02-14 2017-12-31 13F CORE LABORATORIES N V COM N22717107 462,889 -28,758 -5.85 50,710 4.50 0.0128
2017-11-13 2017-09-30 13F CORE LABORATORIES N V COM N22717107 491,647 126,573 34.67 48,525 31.25 0.0126
2017-08-11 2017-06-30 13F CORE LABORATORIES N V COM N22717107 365,074 55,236 17.83 36,971 3.29 0.0103
2017-05-12 2017-03-31 13F CORE LABORATORIES N V COM N22717107 309,838 14,122 4.78 35,793 0.83 0.0103
2017-02-13 2016-12-31 13F CORE LABORATORIES N V COM N22717107 295,716 -347,527 -54.03 35,497 -50.87 0.0109
2016-11-09 2016-09-30 13F CORE LABORATORIES N V COM N22717107 643,243 20,021 3.21 72,255 -6.42 0.0225
2016-08-12 2016-06-30 13F CORE LABORATORIES N V COM N22717107 623,222 46,332 8.03 77,211 28.55 0.0251
2016-08-19 2016-03-31 13F/A-1 CORE LABORATORIES N V COM N22717107 576,890 9,229 1.63 60,065 -2.69 0.0199
2016-05-13 2016-03-31 13F Core Laboratories N COMM N22717107 576,888 64,848
2016-02-12 2015-12-31 13F Core Laboratories N COMM N22717107 567,661 142,268 33.44 61,728 45.40 0.0205
2015-11-12 2015-09-30 13F CORE LABORATORIES N V COM N22717107 425,393 425,393 0.00 42,454 0.0142
2015-08-13 2015-06-30 13F Core Laboratories N COMM N22717107 0 -431,897 -100.00 0 -100.00
2015-05-14 2015-03-31 13F Core Laboratories N COMM N22717107 431,897 87,175 25.29 45,128 8.78 0.0136
2015-02-12 2014-12-31 13F Core Laboratories N COM N22717107 344,722 -4,450 -1.27 41,484 -18.82 0.0125
2014-11-13 2014-09-30 13F Core Laboratories N COMM N22717107 349,172 118,044 51.07 51,101 32.34 0.0160
2014-08-14 2014-06-30 13F CORE LABORATORIES N V com N22717107 231,128 -112,231 -32.69 38,612 -43.33 0.0120
2014-05-14 2014-03-31 13F CORE LABORATORIES N V COMM N22717107 343,359 123,951 56.49 68,136 62.63 0.0214
2014-02-21 2013-12-31 13F/A-1 CORE LABORATORIES N V COM N22717107 219,408 7,574 3.58 41,896 16.88 0.0134
2014-02-12 2013-12-31 13F CORE LABORATORIES N V COM N22717107 219,408 41,896
2013-11-13 2013-09-30 13F CORE LABORATORIES N V COM N22717107 211,834 -10,969 -4.92 35,844 6.08 0.0126
2013-08-09 2013-06-30 13F CORE LABORATORIES N V COM N22717107 222,803 222,803 33,791 0.0122
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.