X0202 SCHEDULE 13G/A 0000053417-24-000060 0000053417 XXXXXXXX LIVE 4 Common Stock 05/29/2026 0001759138 CABALETTA BIO INC 12674W109 2929 Arch Street, Suite 600 Philadelphia PA 19104 Rule 13d-1(b) Jennison Associates LLC DE 24267980 0 0 24267980 24267980 11.4 IA CABALETTA BIO INC 2929 Arch Street, Suite 600, Philadelphia, PA 19104 Jennison Associates LLC 55 East 52nd Street, New York, NY 10055 USA IA 24267980 11.4 24267980 0 0 24267980 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Jennison Associates LLC Beata Markowicz 06/04/2026