X0609 4 2026-03-19 0001754068 Kalaris Therapeutics, Inc. KLRS 0001681782 Hagen Brett R false C/O KALARIS THERAPEUTICS, INC. 400 CONNELL DRIVE, SUITE 5500 BERKELEY HEIGHTS NJ 07922 false true false false Chief Accounting Officer false Common Stock 2026-03-20 4 S false 1915 6.72 D 0 D Stock Option (Right to Buy) 6.81 2026-03-19 4 A false 60800 0 A 2036-03-18 Common Stock 60800 60800 D Due to an administrative error, the Reporting Person filed a Form 4 on March 27, 2025 reporting beneficial ownership of 1,925 shares, when in fact the amount of securities beneficially owned was 1,915. The number of shares beneficially owned by the Reporting Person following the transaction reported herein has been updated accordingly. The option was granted on March 19, 2026. The shares underlying the option are scheduled to vest over four years, with 25% of the shares underlying the option vesting on March 19, 2027, and the remainder vesting in equal monthly installments thereafter, subject to continuous service. /s/ Brett Hagen 2026-03-23