Form 4 Filing for Carol A Vallone

Carol A Vallone, a director at Definium Therapeutics, Inc. (DFTX), reported a transaction on September 18, 2026. She acquired 1086 common shares at a price of $35.52 per share, bringing her total post-transaction shares to 22296. Additionally, she exercised a stock option to buy 1086 common shares, with an exercise price of $35.52 per share. This transaction resulted in 0 shares owned following the transaction, suggesting the option was exercised and the shares were subsequently sold or transferred. The reporting owner