Charles River Laboratories International, Inc.
MX ˙ BMV ˙ US1598641074
SecurityMX:CRL / Charles River Laboratories International, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership825,668 shares
Latest Disclosed Value $ 142,428,075
Morgan Stanley reports 4.14% increase in ownership of CRL / Charles River Laboratories International, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 825,668 shares of Charles River Laboratories International, Inc. (MX:CRL) valued at $142,428,075 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 792,820 shares of Charles River Laboratories International, Inc.. This represents a change in shares of 4.14% during the quarter.

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)
2026-05-15 2026-03-31 13F CHARLES RIV LABS INTL COM 159864107 825,668 32,848 4.14 142,428 -9.94 0.0086
2026-05-27 2025-12-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 792,820 -41,969 -5.03 158,152 21.09 0.0094
2026-02-13 2025-12-31 13F CHARLES RIV LABS INTL COM 159864107 792,820 -41,969 158,152 0.0094
2026-05-27 2025-09-30 13F/A-1 CHARLES RIV LABS INTL COM 159864107 834,789 79,926 10.59 130,612 14.04 0.0079
2025-11-14 2025-09-30 13F CHARLES RIV LABS INTL COM 159864107 834,789 79,926 130,612 0.0079
2025-08-15 2025-06-30 13F CHARLES RIV LABS INTL COM 159864107 754,863 295,854 64.45 114,536 65.78 0.0075
2025-05-15 2025-03-31 13F CHARLES RIV LABS INTL COM 159864107 459,009 -19,488 -4.07 69,090 -21.78 0.0049
2025-05-15 2024-12-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 478,497 10,299 2.20 88,331 -4.22 0.0062
2025-02-14 2024-12-31 13F CHARLES RIV LABS INTL COM 159864107 478,497 10,299 88,331 0.0062
2025-05-14 2024-09-30 13F/A-2 CHARLES RIV LABS INTL COM 159864107 468,198 -13,576 -2.82 92,221 -7.34 0.0067
2025-02-14 2024-09-30 13F/A-1 CHARLES RIV LABS INTL COM 159864107 468,198 -13,576 92,221 0.0067
2024-11-14 2024-09-30 13F CHARLES RIV LABS INTL COM 159864107 468,198 -13,576 92,221 0.0008
2025-05-14 2024-06-30 13F/A-2 CHARLES RIV LABS INTL COM 159864107 481,774 46,715 10.74 99,525 -15.57 0.0077
2024-10-17 2024-06-30 13F/A-1 CHARLES RIV LABS INTL COM 159864107 481,774 46,715 99,525 0.0077
2024-08-14 2024-06-30 13F CHARLES RIV LABS INTL COM 159864107 481,774 46,715 99,525 0.0077
2024-10-17 2024-03-31 13F/A-2 CHARLES RIV LABS INTL COM 159864107 435,059 -37,051 -7.85 117,879 5.62 0.0095
2024-08-16 2024-03-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 435,059 -37,051 117,879 0.0011
2024-05-15 2024-03-31 13F CHARLES RIV LABS INTL COM 159864107 435,059 -37,051 117,879 0.0095
2024-08-16 2023-12-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 472,110 -53,183 -10.12 111,607 8.41 0.0098
2024-02-13 2023-12-31 13F CHARLES RIV LABS INTL COM 159864107 472,110 -53,183 111,607 0.0098
2023-11-15 2023-09-30 13F CHARLES RIV LABS INTL COM 159864107 525,293 12,342 2.41 102,947 -4.54 0.0105
2023-08-14 2023-06-30 13F CHARLES RIV LABS INTL COM 159864107 512,951 58,539 12.88 107,848 17.60 0.0106
2023-05-15 2023-03-31 13F CHARLES RIV LABS INTL COM 159864107 454,412 -20,019 -4.22 91,710 -11.29 0.0098
2023-02-14 2022-12-31 13F CHARLES RIV LABS INTL COM 159864107 474,431 193,250 68.73 103,379 86.82 0.0117
2022-11-14 2022-09-30 13F CHARLES RIV LABS INTL COM 159864107 281,181 -50,606 -15.25 55,336 -22.05 0.0075
2022-10-27 2022-06-30 13F/A-1 CHARLES RIV LABS INTL COM 159864107 331,787 138,733 71.86 70,991 29.49 0.0092
2022-08-15 2022-06-30 13F CHARLES RIV LABS INTL COM 159864107 331,787 138,733 70,991 0.0092
2022-10-27 2022-03-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 193,054 -5,994 -3.01 54,822 -26.90 0.0074
2022-05-13 2022-03-31 13F CHARLES RIV LABS INTL COM 159864107 193,054 -5,994 54,822 0.0074
2022-02-14 2021-12-31 13F CHARLES RIV LABS INTL COM 159864107 199,048 11,556 6.16 74,998 -3.07 0.0093
2021-11-15 2021-09-30 13F CHARLES RIV LABS INTL COM 159864107 187,492 -51,373 -21.51 77,373 -12.44 0.0104
2021-08-23 2021-06-30 13F/A-1 CHARLES RIV LABS INTL COM 159864107 238,865 71,153 42.43 88,361 81.79 0.0117
2021-08-16 2021-06-30 13F CHARLES RIV LABS INTL COM 159864107 238,865 71,153 88,361 0.0024
2021-05-17 2021-03-31 13F CHARLES RIV LABS INTL COM 159864107 167,712 -18,698 -10.03 48,607 4.36 0.0071
2021-02-16 2020-12-31 13F CHARLES RIV LABS INTL COM 159864107 186,410 104,440 127.41 46,577 150.91 0.0072
2020-11-13 2020-09-30 13F CHARLES RIV LABS INTL COM 159864107 81,970 15,891 24.05 18,563 61.12 0.0036
2020-08-14 2020-06-30 13F CHARLES RIV LABS INTL COM 159864107 66,079 -33,782 -33.83 11,521 -8.59 0.0026
2020-05-26 2020-03-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 99,861 -6,845 -6.41 12,603 -22.68 0.0034
2020-05-15 2020-03-31 13F CHARLES RIV LABS INTL COM 159864107 99,861 -6,845 12,603 3,418.7074
2020-02-14 2019-12-31 13F CHARLES RIV LABS INTL COM 159864107 106,706 -82,406 -43.58 16,300 -34.88 0.0038
2019-11-14 2019-09-30 13F CHARLES RIV LABS INTL COM 159864107 189,112 6,371 3.49 25,032 -3.47 0.0066
2019-08-14 2019-06-30 13F CHARLES RIV LABS INTL COM 159864107 182,741 39,716 27.77 25,931 24.82 0.0069
2019-05-15 2019-03-31 13F CHARLES RIV LABS INTL COM 159864107 143,025 -4,349 -2.95 20,774 24.55 0.0059
2019-02-14 2018-12-31 13F CHARLES RIV LABS INTL COM 159864107 147,374 -40,464 -21.54 16,679 -34.00 0.0050
2019-04-23 2018-09-30 13F/A-2 CHARLES RIV LABS INTL COM 159864107 187,838 126,456 206.01 25,272 266.79 0.0063
2018-11-20 2018-09-30 13F/A-1 CHARLES RIV LABS INTL COM 159864107 187,838 0 25,272 0.0063
2018-11-14 2018-09-30 13F CHARLES RIV LABS INTL COM 159864107 187,838 126,456 25,272
2019-04-23 2018-06-30 13F/A-1 CHARLES RIV LABS INTL COM 159864107 61,382 -60,138 -49.49 6,890 -46.88 0.0019
2018-08-14 2018-06-30 13F CHARLES RIV LABS INTL COM 159864107 61,382 -60,138 6,890
2019-04-23 2018-03-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 121,520 26,816 28.32 12,971 25.13 0.0036
2018-05-14 2018-03-31 13F CHARLES RIV LABS INTL COM 159864107 121,520 26,816 12,971
2019-04-23 2017-12-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 94,704 -804,878 -89.47 10,366 -89.33 0.0028
2018-02-14 2017-12-31 13F CHARLES RIV LABS INTL COM 159864107 94,704 -804,878 10,366
2017-11-14 2017-09-30 13F CHARLES RIV LABS INTL COM 159864107 899,582 -55,066 -5.77 97,174 0.63 0.0291
2017-08-11 2017-06-30 13F CHARLES RIV LABS INTL COM 159864107 954,648 336,887 54.53 96,563 73.77 0.0292
2017-05-22 2017-03-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 617,761 412,894 201.54 55,569 256.01 0.0171
2017-05-12 2017-03-31 13F CHARLES RIV LABS INTL COM 159864107 617,761 55,569
2017-02-22 2016-12-31 13F/A-1 CHARLES RIV LABS INTL COM 159864107 204,867 130,047 173.81 15,609 150.30 0.0051
2017-02-13 2016-12-31 13F CHARLES RIV LABS INTL COM 159864107 204,867 15,609
2016-11-10 2016-09-30 13F CHARLES RIV LABS INTL COM 159864107 74,820 -67,619 -47.47 6,236 -46.90 0.0021
2016-08-12 2016-06-30 13F CHARLES RIV LABS INTL COM 159864107 142,439 -134,058 -48.48 11,743 -44.08 0.0042
2016-05-12 2016-03-31 13F CHARLES RIV LABS INTL COM 159864107 276,497 -16,751 -5.71 20,998 -10.92 0.0081
2016-02-09 2015-12-31 13F CHARLES RIV LABS INTL COM 159864107 293,248 55,393 23.29 23,573 56.02 0.0085
2016-02-08 2015-09-30 13F/A-1 CHARLES RIV LABS INTL COM 159864107 237,855 113,320 90.99 15,109 72.50 0.0056
2015-11-09 2015-09-30 13F CHARLES RIV LABS INTL COM 159864107 237,855 15,109
2015-08-12 2015-06-30 13F CHARLES RIV LABS INTL COM 159864107 124,535 -184,365 -59.68 8,759 -64.24 0.0030
2015-05-14 2015-03-31 13F CHARLES RIV LABS INTL COM 159864107 308,900 -17,014 -5.22 24,494 18.09 0.0090
2015-02-13 2014-12-31 13F CHARLES RIV LABS INTL COM 159864107 325,914 15,049 4.84 20,742 11.68 0.0076
2014-12-16 2014-09-30 13F/A-1 CHARLES RIV LABS INTL COM 159864107 310,865 47,014 17.82 18,572 31.52 0.0071
2014-11-14 2014-09-30 13F CHARLES RIV LABS INTL COM 159864107 310,865 18,572
2014-08-12 2014-06-30 13F CHARLES RIV LABS INTL COM 159864107 263,851 124,844 89.81 14,121 68.37 0.0242
2014-05-13 2014-03-31 13F CHARLES RIV LABS INTL COM 159864107 139,007 -98,011 -41.35 8,387 -33.28 0.0035
2014-02-13 2013-12-31 13F CHARLES RIV LABS INTL COM 159864107 237,018 81,891 52.79 12,570 75.17 0.0053
2013-11-13 2013-09-30 13F CHARLES RIVER LABORATORIES COM 159864107 155,127 11,421 7.95 7,176 21.71 0.0034
2013-08-08 2013-06-30 13F CHARLES RIVER LABORATORIES COM 159864107 143,706 143,706 5,896 0.0030
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.