X0609 4 2026-06-15 0 0001953926 Zenas BioPharma, Inc. ZBIO 0001317757 Farmer Joseph L false C/O ZENAS BIOPHARMA, INC. 852 WINTER ST., SUITE 250 WALTHAM MA 02451 0 1 0 0 See Remarks 0 Common Stock 2026-02-05 5 A 0 E 974 13.35 A 974 D Stock Option (Right to Buy) 18.71 2026-06-15 4 A 0 175000 0 A 2036-06-15 Common Stock 175000 175000 D Common Stock acquired under Zenas BioPharma, Inc.'s 2024 Employee Stock Purchase Plan on February 5, 2026 in transactions that were exempt under Rule 16b-3(c). The option vests as to 25% of the underlying shares of common stock on June 15, 2027, the first anniversary of the vesting commencement date, and as to the remaining shares, in equal monthly installments over 36 months thereafter, subject to continued service. President and Chief Operating Officer By: /s/ Jeffrey Held, Attorney-in-Fact 2026-06-17