Charles River Laboratories International, Inc.
US ˙ NYSE ˙ US1598641074

SecurityCRL / Charles River Laboratories International, Inc.
InstitutionBoston Trust Walden Corp
Latest Disclosed Ownership285,425 shares
Latest Disclosed Value $ 49,235,812
Boston Trust Walden Corp reports 6.38% decrease in ownership of CRL / Charles River Laboratories International, Inc.

On April 24, 2026 - Boston Trust Walden Corp filed a 13F-HR form disclosing ownership of 285,425 shares of Charles River Laboratories International, Inc. (US:CRL) valued at $49,235,812 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 304,877 shares of Charles River Laboratories International, Inc.. This represents a change in shares of -6.38% during the quarter. The current value of the position is $51,339,395 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)
2026-04-24 2026-03-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 285,425 -19,452 -6.38 49,236 -19.04 0.2421
2026-01-28 2025-12-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 304,877 -2,365 -0.77 60,817 26.51 0.4590
2025-10-17 2025-09-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 307,242 82,051 36.44 48,071 40.69 0.3527
2025-07-28 2025-06-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 225,191 19,789 9.63 34,168 10.52 0.2437
2025-04-21 2025-03-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 205,402 919 0.45 30,917 -18.09 0.2259
2025-01-24 2024-12-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 204,483 8,338 4.25 37,748 -2.30 0.2649
2024-10-24 2024-09-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 196,145 -4,169 -2.08 38,635 -6.64 0.2688
2024-07-19 2024-06-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 200,314 5,375 2.76 41,381 -21.66 0.3069
2024-04-22 2024-03-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 194,939 -2,420 -1.23 52,819 13.21 0.3768
2024-01-24 2023-12-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 197,359 6,462 3.39 46,656 24.71 0.3520
2023-10-18 2023-09-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 190,897 869 0.46 37,412 -6.36 0.3135
2023-07-24 2023-06-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 190,028 15,746 9.03 39,953 13.59 0.3277
2023-04-19 2023-03-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 174,282 33,693 23.97 35,174 14.82 0.3036
2023-01-20 2022-12-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 140,589 40,316 40.21 30,634 55.23 0.2694
2022-10-19 2022-09-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 100,273 -840 -0.83 19,734 -8.79 0.1955
2022-07-22 2022-06-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 101,113 2,211 2.24 21,635 -22.97 0.2044
2022-04-20 2022-03-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 98,902 14,431 17.08 28,086 -11.75 0.2320
2022-01-21 2021-12-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 84,471 849 1.02 31,827 -7.77 0.2556
2021-10-25 2021-09-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 83,622 -2,059 -2.40 34,508 8.87 0.3056
2021-07-22 2021-06-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 85,681 9,899 13.06 31,696 44.31 0.2818
2021-04-21 2021-03-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 75,782 10,839 16.69 21,964 35.35 0.2127
2021-01-15 2020-12-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 64,943 1,804 2.86 16,227 13.49 0.1731
2020-10-14 2020-09-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 63,139 989 1.59 14,298 31.95 0.1781
2020-07-23 2020-06-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 62,150 -42,207 -40.44 10,836 -17.73 0.1463
2020-04-24 2020-03-31 13F/A-1 CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 104,357 -42,185 -28.79 13,171 -41.16 0.2099
2020-04-21 2020-03-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 129,442 -17,100 16,337 144,865.1310
2020-01-10 2019-12-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 146,542 1,791 1.24 22,385 16.83 0.2605
2019-10-21 2019-09-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 144,751 1,491 1.04 19,161 -5.74 0.2409
2019-07-25 2019-06-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 143,260 -1,480 -1.02 20,328 -3.31 0.2645
2019-04-16 2019-03-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 144,740 2,563 1.80 21,024 30.66 0.2862
2019-01-17 2018-12-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 142,177 -7,136 -4.78 16,091 -19.90 0.2560
2018-10-23 2018-09-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 149,313 -5,814 -3.75 20,089 15.35 0.2767
2018-07-25 2018-06-30 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 155,127 41,134 36.08 17,415 43.13 0.2555
2018-04-13 2018-03-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 113,993 -8,543 -6.97 12,167 -9.28 0.1846
2018-01-29 2017-12-31 13F CHARLES RIVER LABORATORIES INT COMMON STOCK 159864107 122,536 122,536 13,412 0.1966
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.