CHARLES RIVER LABORATORIES INTERNATIONAL INC

During the quarter ended December 30, 2023, none of our officers or directors adopted orterminated any contract, instruction, or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act or any “non-Rule 10b5-1 trading arrangement” as defined in Item 408(c) of Regulation S-K., except as follows:

•On November 14, 2023, James Foster, our Chair, President, and Chief Executive Officer, terminated a Rule 10b5-1 trading arrangement, dated February 23, 2023 for the sale of up to 112,341 shares of common stock. Mr. Foster did not sell any shares pursuant to such plan, which, absent such termination, would have expired on March 1, 2025.

•On November 15, 2023, Birgit Girshick, our Corporate Executive Vice President & Chief Operating Officer, terminated a Rule 10b5-1 trading arrangement, dated February 24, 2023 for the sale of up to 25,320 shares of common stock. Ms. Girshick did not sell any shares pursuant to such plan, which, absent such termination, would have expired on February 28, 2024.

•On November 22, 2023, Ms. Girshick entered into a Rule 10b5-1 trading arrangement for the sale of up to 22,362 shares of common stock, subject to certain conditions. The arrangement’s expiration date is February 28, 2025.

During the quarter ended December 30, 2023, the Company did not adopt or terminate any “Rule 10b5-1 trading arrangement” as defined in Item 408(a) of Regulation S-K.