X0609 4 2026-06-09 0001807120 Design Therapeutics, Inc. DSGN 0001595117 George Simeon false 929 MAIN STREET SUITE 200 REDWOOD CITY CA 94063 true false true false false Stock Option (right to buy) 10.55 2026-06-09 4 A false 30000 0 A 2036-06-08 Common Stock 30000 30000 D The shares subject to the option vest in equal monthly installments over 12 months following June 9, 2026 provided that the shares subject to the option will in any case be fully vested on the date of the Company's next annual meeting of stockholders. /s/ Sasha Keough, attorney-in-fact for Simeon George 2026-06-11