Power of Attorney for Gregory Martini, CFO of Kyverna Therapeutics

This SEC Form 3 filing includes a Power of Attorney document for Gregory S. Martini, Chief Financial Officer of Kyverna Therapeutics, Inc. (KYTX). The filing, dated May 20, 2026, documents Martini's appointment of Chihiro Saito and Samantha Eldredge as his attorneys-in-fact to execute and file Forms 3, 4, 5, and 144 on his behalf regarding securities transactions. The Power of Attorney was executed on May 8, 2026, and authorizes the designated attorneys to complete and file required SEC forms related to Section 16 reporting obligations and Rule 144 transactions. The document specifies that the attorneys-in-fact are not assuming Martini's compliance responsibilities and outlines conditions for termination of the power of attorney arrangement.