X0306 4 2017-02-24 0001100682 CHARLES RIVER LABORATORIES INTERNATIONAL INC CRL 0001688104 Barbo William D 251 BALLARDVALE STREET WILMINGTON MA 01887 1 Corporate Executive VP & CCO Common Stock 2017-02-24 4 A 0 2899 0 A 24662 D Common Stock 2017-02-26 4 F 0 289 88.05 D 24373 D Stock Options (Right to Buy) 88.05 2017-02-24 4 A 0 13969 0 A 2018-02-24 2022-02-24 Common Stock 13969 13969 D Consists of 2,899 unvested restricted stock units that vest as follows: 724 shares vest one (1) year from the date of issuance, 725 shares vest two (2) years from the date of issuance, 725 shares vest three (3) years from the date of issuance, and 725 shares vest four (4) years from the date of issuance. Stock options vest as follows: 3,492 options vest one (1) year from the date of grant, 3,492 options vest two (2) years from the date of grant, 3,492 options vest three (3) years from the date of grant, and 3,493 options vest four (4) years from the date of grant. /s/ William D. Barbo 2017-02-27