Zimmerly Ronald Len Jr. 4

4 · MIDDLEFIELD BANC CORP · Filed Dec 18, 2025

Form 4

Period: 2025-12-17

DirectorChief Executive Officer

Transactions

Holdings

Footnotes (6)

[F1]Amendment of conditional stock award agreement resulting in acceleration of restricted stock grants. The details of the accelerated restricted stock grants may be found in a Form 8-K filed December 12, 2025.
[F2]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.
[F3]Includes shares acquired under MBCN Dividend Reinvestment Plan
[F4]The award represents a grant of restricted stock which vests ratably over a three-year period provided that Mr. Zimmerly 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 details of the vesting conditions may be found in a Form 8K filing dated September 4, 2024.
[F5]The award represents a grant of restricted stock which vests ratably over a three-year period provided that Mr. Zimmerly 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 details of the vesting conditions may be found in a Form 8K filing dated January 17, 2025.
[F6]Each restricted stock unit represents the right to receive, at settlement, one share of common stock.

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