X0508 4 2026-02-23 0000836147 MIDDLEFIELD BANC CORP MBCN 0002007936 Noblit Rebecca A 15985 EAST HIGH STREET MIDDLEFIELD OH 44062 1 EVP-Chief Credit Officer 0 Common Stock 2026-02-23 4 A 0 1708 35.18 A 9556 D Common Stock 2026-02-23 4 A 0 1934 35.18 A 11490 D Common Stock 2026-02-23 4 A 0 7203 35.18 A 18693 D Common Stock 2026-02-23 4 A 0 8154 35.18 A 26847 D Common Stock 2026-02-23 4 F 0 5420 35.18 D 21427 D The shares represent accelerated vesting of restricted stock units ("RSUs") resulting from action of the Middlefield Compensation Committee on February 23, 2026, approving the full vesting of all outstanding plan share awards, including the RSUs. For further information regarding the acceleration of the RSUs, please see the Form 8-K Current Report filed by Middlefield with the SEC on February 25, 2026.The restricted stock award was originally granted on September 4, 2024, and provides for vesting on the third anniversary of the award. The shares represent accelerated vesting of RSUs resulting from Compensation Committee approval on February 23, 2026. See the Form 8-K Current Report filed by Middlefield with the SEC on February 25, 2026.The restricted stock award was originally granted on January 17, 2025, and provides for vesting on the third anniversary of the award. The shares represent accelerated vesting of performance share units ("PSUs") resulting from action of the Middlefield Compensation Committee on February 23, 2026, approving the full vesting of all outstanding plan share awards, including the PSUs. See the Form 8-K Current Report filed by Middlefield with the SEC on February 25, 2026. The vesting conditions at grant were described in a Form 8-K filed on September 4, 2024. The shares represent accelerated vesting of PSUs resulting from action of the Middlefield Compensation Committee on February 23, 2026. See the Form 8-K Current Report filed by Middlefield with the SEC on February 25, 2026. The vesting conditions at grant were described in a Form 8-K filed on January 17, 2025. /s/ Rebecca A. Noblit by Julie E. Shaw Power of Attorney 2026-02-25