X0306 4 2022-03-01 0 0000836147 MIDDLEFIELD BANC CORP MBCN 0001698885 Erminio Courtney M 15985 EAST HIGH STREET MIDDLEFIELD OH 44062 0 1 0 0 SVP/Risk Officer Common Stock 2022-03-01 4 A 0 764 25.52 A 2221.991 D Common Stock 2022-03-01 4 F 0 193 25.52 D 2028.991 D Common Stock 150.525 D Conditional Stock Award 24.80 2025-02-23 Common Stock 1713 1713 D Conditional Stock Award 22.50 2024-02-23 Common Stock 834 834 D Conditional Stock Award 26.09 2023-02-25 Common Stock 698 698 D Acquisition represents the vesting of performance shares granted to the reporting person on March 1, 2019, which vested on the third anniversary of their grant date based upon the Company's total shareholder return. Includes shares acquired under MBCN Dividend Reinvestment Plan. Includes shares held jointly with spouse. Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. Vesting is subject to a time-based or service condition and a performance-based condition. The details of the vesting conditions may be found in a Form 8-K filing dated February 25, 2022. Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. Vesting is subject to a time-based or service condition and a performance-based condition. The details of the vesting conditions may be found in a Form 8-K filing dated February 25, 2021. Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. Vesting is subject to a time-based or service condition and a performance-based condition. The details of the vesting conditions may be found in a Form 8-K filing dated February 26, 2020. Courtney M. Erminio by James R. Heslop, II Power of Attorney 2022-03-03