X0508 4 2025-12-17 0000836147 MIDDLEFIELD BANC CORP MBCN 0002007962 Cheravitch Michael L 15985 EAST HIGH STREET MIDDLEFIELD OH 44062 1 EVP-Chief Banking Officer 0 Common Stock 2025-12-17 4 A 0 5204 37 A 5809 D Common Stock 2025-12-17 4 F 0 1514 37 D 4295 D Conditional Stock Award 30.0000 2025-12-31 Common Stock 2300 2300 D Conditional Stock Award 2027-09-06 Common Stock 1708 1708 D Conditional Stock Award 2028-01-14 Common Stock 2630 2630 D Amendment of performance share unit award agreement resulting in acceleration of performance share unit grants. The details of the accelerated performance share unit grants may be found in a Form 8-K filed December 12, 2025. 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 on December 31, 2025, if the executive's service continues through that 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 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 2025-12-18