X0508 4 2025-01-01 0000836147 MIDDLEFIELD BANC CORP MBCN 0001968970 Moeller Jennifer L 15985 EAST HIGH STREET MIDDLEFIELD OH 44062 1 0 Common Stock 2025-01-01 4 A 0 278 28.05 A 2077.4881 D Common Stock 2213.7633 D Shares acquired under Director Compensation program for members of the Board of Directors of The Middlefield Banking Company. Includes shares acquired under MBCN Dividend Reinvestment Plan The reporting person received an incorrect share count for the 5/31/2024 purchase, causing omissions in two subsequent Form 4 filings. /s/ Jennifer L. Moeller by Julie E. Shaw Power of Attorney 2025-01-02