Arthur Tzianabos Granted Stock Options in Q32 Bio Inc.

Arthur Tzianabos, a director of Q32 Bio Inc., was granted 53,521 stock options on October 23, 2025. The options, which are for the purchase of common stock at an exercise price of $2.80 per share, will vest and become exercisable in full on the earlier of October 23, 2026, or the date of the company's next annual meeting of stockholders, contingent on Tzianabos's continued service on the vesting date. The options expire on October 22, 2035. This transaction is reported under Form 4, indicating a change in beneficial ownership.