X0609 4 2026-06-15 0 0001953926 Zenas BioPharma, Inc. ZBIO 0001953094 Boylan James P false C/O ZENAS BIOPHARMA, INC. 852 WINTER ST., SUITE 250 WALTHAM MA 02451 1 0 0 0 0 Stock Option (Right to Buy) 18.71 2026-06-15 4 A 0 18500 0 A 2036-06-15 Common Stock 18500 18500 D The option vests as to 100% of the underlying shares of common stock on June 15, 2027, the first anniversary of the vesting commencement date, subject to continued service. The reporting person holds the stock option, and the shares underlying the option, for the benefit of Enavate Sciences, L.P. Accordingly, the reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein, if any. By: /s/ Jeffrey Held, Attorney-in-Fact 2026-06-17