Charles River (CRL)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-25 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: CHARLES RIVER LABORATORIES INTERNATIONAL, INC. (CRL) CIK: 0001100682 --- Reporting Owner --- Name: FOSTER JAMES C CIK: 0001141722 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-25 | Code: M (Exercise of derivative) Shares: +21,132 | Price: $194.12 Total Value: $4,102,143.84 Shares Owned After: 52,728 | Ownership: D (Direct) [Transaction #2] Security: Common Stock Date: 2026-08-25 | Code: M (Exercise of derivative) Shares: +12,429 | Price: $208.44 Total Value: $2,590,700.76 Shares Owned After: 65,157 | Ownership: D (Direct) [Transaction #3] Security: Common Stock Date: 2026-08-25 | Code: S (Open market sale) Shares: -33,561 | Price: $300.00 Total Value: $10,068,300.00 Shares Owned After: 31,596 | Ownership: D (Direct) Footnotes: [F1] This exercise and sale occurred pursuant to a Rule 10b5-1 Trading Plan that was initially adopted on March 6, 2026. --- Derivative Transactions --- [Transaction #1] Security: Stock Options (Right to Buy) Date: 2026-08-25 | Code: M (Exercise of derivative) Shares: -21,132 | Price: $0.00 Exercise Price: $194.12 Exercisable: N/A | Expires: 2033-05-26 Shares Owned After: 7,044 | Ownership: D (Direct) [Transaction #2] Security: Stock Options (Right to Buy) Date: 2026-08-25 | Code: M (Exercise of derivative) Shares: -12,429 | Price: $0.00 Exercise Price: $208.44 Exercisable: N/A | Expires: 2034-05-31 Shares Owned After: 12,429 | Ownership: D (Direct) --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) [Holding #2] Security: Common Stock Ownership: I (Indirect) [Holding #3] Security: Common Stock Ownership: I (Indirect) [Holding #4] Security: Common Stock Ownership: I (Indirect) [Holding #5] Security: Common Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: This exercise and sale occurred pursuant to a Rule 10b5-1 Trading Plan that was initially adopted on March 6, 2026. --- Signature --- /s/ /s/ James C. Foster (2026-08-26)