X0609 4 2026-06-09 0001798749 Jade Biosciences, Inc. JBIO 0001737613 Lavelle Erin false C/O JADE BIOSCIENCES, INC. 221 CRESCENT ST., BLDG. 23, STE. 105 WALTHAM MA 02453 true false false false false Stock Option (Right to Buy) 15.22 2026-06-09 4 A false 34843 0 A 2036-06-08 Common Stock 34843 34843 D This option represents a right to purchase shares of the Issuer's common stock, which vests in full on the earlier of (i) June 9, 2027 or (ii) the date of the next annual meeting of the Issuer's stockholders, in each case, subject to the Reporting Person's continued service to the Issuer. /s/ Elizabeth Balta, as attorney-in-fact for Erin Lavelle 2026-06-11