Cox John plan to sell securities of Dyne Therapeutics, Inc. under Form 144

Cox John filed Form 144 to notify SEC of plan to sell 3311 units of Dyne Therapeutics, Inc. securities around 2026-05-13, with aggregate market value of $60,805.00. The total outstanding units is 165313769.0. The amount planned to be sold represents 0.00% of total outstanding units; Recent transactions in past 3 months include: On 03/05/2026, sold 2732 units for $40707.00;