Ronald L. Zimmerly Jr. - Dec 1, 2025 Form 4 Insider Report for MIDDLEFIELD BANC CORP (MBCN)

Role: Chief Executive Officer, Director
Signature: /s/ Ronald L. Zimmerly, Jr. by Julie E. Shaw Power of Attorney
Stock symbol: MBCN
Transactions as of: Dec 1, 2025
Transactions value $: $93,178
Form type: 4
Date filed: 12/3/2025, 11:07 AM
Previous filing: Aug 7, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Zimmerly Ronald Len Jr.	Chief Executive Officer, Director	15985 EAST HIGH STREET, MIDDLEFIELD	/s/ Ronald L. Zimmerly, Jr. by Julie E. Shaw Power of Attorney	2025-12-03	0001954793

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MBCN	Common Stock	Award	$132K	+3.79K	+10.57%	$34.82	39.6K	Dec 1, 2025	Direct	F1, F2
transaction	MBCN	Common Stock	Tax liability	-$38.7K	-1.11K	-2.81%	$34.82	38.5K	Dec 1, 2025	Direct	F1
holding	MBCN	Common Stock						8.79K	Dec 1, 2025	Held in IRA

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	MBCN	Conditional Stock Award						3.72K	Dec 1, 2025	Common Stock	3.72K	$27.40	Direct	F4
holding	MBCN	Conditional Stock Award						4.52K	Dec 1, 2025	Common Stock	4.52K		Direct	F3, F6
holding	MBCN	Conditional Stock Award						6.86K	Dec 1, 2025	Common Stock	6.86K		Direct	F5, F6

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Includes shares acquired under MBCN Dividend Reinvestment Plan
F2	The acquisition represents the vesting of restricted stock granted to the reporting person on December 1, 2022. The shares vested on the third anniversary of the grant date.
F3	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.
F4	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.
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.