Ronald Len Zimmerly Jr. - 17 Dec 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
Issuer symbol: MBCN
Transactions as of: 17 Dec 2025
Net transactions value: +$395,456
Form type: 4
Filing time: 18 Dec 2025, 17:57:20 UTC
Previous filing: 03 Dec 2025
Next filing: 16 Jan 2026
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	18 Dec 2025	0001954793

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MBCN	Common Stock	Award	$172,161	+4,653	+12%	$37.00	43,169	17 Dec 2025	Direct	F1, F3
transaction	MBCN	Common Stock	Award	$375,957	+10,161	+24%	$37.00	53,330	17 Dec 2025	Direct	F2, F3
transaction	MBCN	Common Stock	Tax liability	$152,662	-4,126	-7.7%	$37.00	49,204	17 Dec 2025	Direct	F3
holding	MBCN	Common Stock						8,786	17 Dec 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						4,520	17 Dec 2025	Common Stock	4,520		Direct	F4, F6
holding	MBCN	Conditional Stock Award						6,864	17 Dec 2025	Common Stock	6,864		Direct	F5, F6

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

Explanation of Responses:

Id	Content
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.