X0508 4 2026-01-14 0000836147 MIDDLEFIELD BANC CORP MBCN 0002007962 Cheravitch Michael L 15985 EAST HIGH STREET MIDDLEFIELD OH 44062 1 EVP-Chief Banking Officer 0 Common Stock 2026-01-14 4 A 0 876 34.50 A 6801 D Common Stock 2026-01-14 4 F 0 301 34.50 D 6500 D Conditional Stock Award 2027-09-06 Common Stock 1708 1708 D Conditional Stock Award 2028-01-14 Common Stock 1754 1754 D The acquisition represents the vesting of restricted stock granted to the reporting person on January 14, 2025. The shares vested on the first anniversary of the grant. The award represents a grant of restricted stock which vests ratably over a three-year period provided that Mr. Cheravitch remains continuously employed by Middlefield as of each vesting date. Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. The vesting details may be found on a Form 8-K filed September 4, 2024. The award represents a grant of restricted stock which vests ratably over a three-year period provided that Mr. Cheravitch remains continuously employed by Middlefield as of each vesting date. Until the award vests, the award confers no right to vote, no right to dividends, and no other shareholder rights to the recipient. The vesting details may be found on a Form 8-K filed January 17, 2025. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. /s/ Michael L. Cheravitch by Julie E. Shaw Power of Attorney 2026-01-16