X0508 4 2024-08-30 0000836147 MIDDLEFIELD BANC CORP MBCN 0001792684 RANTTILA MICHAEL 15985 EAST HIGH STREET MIDDLEFIELD OH 44062 1 EVP/CFO 0 Common Stock 4035.10 D Common Stock 2 I as Custodian for Grandson Conditional Stock Award 2024-08-30 4 A 0 4520 A 2027-08-30 Common Stock 4520 4520 D Conditional Stock Award 27.4000 2026-03-10 Common Stock 2846 2846 D Conditional Stock Award 24.8000 2025-02-23 Common Stock 2016 2016 D Includes shares acquired under MBCN Dividend Reinvestment Plan The award represents a grant of restricted stock which vests ratably over a three-year period provided that Mr. Ranttila 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. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. 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 8K filing dated March 17, 2023. 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. /s/ Michael C. Ranttila by Julie E. Shaw Power of Attorney 2024-09-04